CN217681690U

CN217681690U - Passage conversion type flow-regulating water-controlling sectional acidizing tubular column

Info

Publication number: CN217681690U
Application number: CN202221596338.4U
Authority: CN
Inventors: 陈彦洪
Original assignee: Beijing Heli Qidian Technology Co ltd
Current assignee: Beijing Heli Qidian Technology Co ltd
Priority date: 2021-07-20
Filing date: 2022-06-23
Publication date: 2022-10-28
Anticipated expiration: 2032-06-23
Also published as: CN217681696U; DE202022101554U1; WO2023000169A1; CN217681695U; CA3158805A1; CN115135849A

Abstract

The specification discloses a channel switching type flow-regulating and water-controlling segmented acidizing tubular column, which comprises a single-flow water-controlling sieve tube and a single-flow ball-throwing fracturing sliding sleeve connected with the single-flow water-controlling sieve tube. The sieve tube is provided with a base tube, a screen part arranged on the base tube and a flow regulating and water controlling part communicated with the screen part; the screen portion is used for filtering formation fluid; the flow regulating and water controlling part is communicated with the downstream of the screen part and is used for increasing the flow resistance of water in formation fluid. A central channel communicated with the base pipe and an acidification hole for communicating the central channel with the exterior of the single-flow ball-throwing fracturing sliding sleeve are arranged in the single-flow ball-throwing fracturing sliding sleeve; the single flow pitching fracturing sleeve is configured to be operable to open and close the acidizing hole by an external well pressure. The channel conversion type flow-regulating and water-controlling segmented acidizing tubular column provided by the specification can realize the production function of the original tubular column after acid fracturing, and has the effect of controlling water to inhibit the edge and bottom water coning of an oil-gas well.

Description

Channel conversion type flow-regulating water-controlling segmented acidizing tubular column

Technical Field

The specification relates to the technical field of oil and gas well development, relates to the technologies of oil and gas well sectional flow regulation and water control, sectional acid fracturing and oil and gas production, and particularly relates to a channel conversion type flow regulation and water control sectional acidification pipe column.

Background

With the continuous increase of world energy demand, the development of deep complex natural gas and dense oil gas becomes the key point of the exploration and development of fossil energy resources all over the world. However, in the development of many complex reservoir reservoirs, the multi-faced adjacent sour H ₂ S and CO ₂ The influence of gas, most oil and gas wells contain highly toxic H ₂ And (4) S gas. In order to increase the single-well yield and reduce the input-output ratio, a plurality of deep oil and gas reservoirs adopt long horizontal well completion, the physical property of a reservoir is relatively poor along with the extension of oil and gas well distribution from a main block to a peripheral block, in order to improve the single-well yield, the long horizontal well usually needs acid fracturing and acid pickling operation, some block horizontal mineshafts are more than 1000 meters long, and due to the permeability anisotropy and the rock heterogeneity of the long horizontal mineshafts, the general acid fracturing and acid pickling effect is not obvious, the sectional acid fracturing and acid pickling operation is usually needed, so that the single-well yield is improved.

At present, a segmented acid fracturing production integrated pipe column is generally adopted, however, as oil and gas fields are developed and enter the middle and later stages, the increasing of the water yield of an oil and gas well and the water logging and production stopping of the water yield of the oil and gas well become keys influencing the yield of the whole oil field more and moreAnd the horizontal shaft is not necessarily a straight line or a straight surface parallel to the horizontal shaft, so that once a certain horizontal section is drained or is broken through by water when strong edge bottom water exists around, the whole horizontal shaft is quickly submerged by the water, and further the water-locked shaft is caused, oil and gas cannot be smoothly extracted, and the productivity of the oil and gas well is influenced. This requires consideration of staged water control during well completion, since deep complex reservoirs are generally high in H content ₂ S, to prevent the occurrence of H ₂ S accident, in the general oil and gas well completion process, after heavy slurry well control fluid is required to be put in, the well completion operation is ensured to be completed in one time as much as possible, and the pipe string is not recommended to be pulled out for multiple times in the well completion, so that the H of the well bottom is avoided ₂ And S overflows a well mouth to cause serious accidents, so that operation modes such as production and water control pipe columns can not be realized after segmented acid fracturing.

In order to efficiently develop a complex deep acid gas-containing oil-gas reservoir, on the basis of segmented acid fracturing, late balanced gas production is considered, water control is performed to inhibit bottom water coning, and high H content is considered ₂ S operation risk, need to invent a method suitable for high H content ₂ The acid fracturing production water control integrated pipe column of the S gas well and the matched process are used for well completion by putting in the integrated pipe column, only one-time pipe column putting is needed for operation, effectively sectionally acid fracturing is used for communicating a reservoir stratum, production can be realized simultaneously, in the production process, water can be effectively sectionally controlled, the output speeds of different sectionally gas are balanced, and the coning speed of bottom water outside different sectionally controlled areas is inhibited, so that the integration of acid fracturing production water control in one process is realized, the process cost is saved, and the production operation safety of a complex deep oil-gas shaft is furthest ensured.

SUMMERY OF THE UTILITY MODEL

In view of the defects in the prior art, an object of the present specification is to provide a channel switching type flow-regulating and water-controlling segmented acidizing tubular column, which can realize the production function of the original tubular column after acid fracturing, and has the effect of controlling water to inhibit the water coning at the bottom of the oil-gas well.

In order to achieve the above object, an embodiment of the present specification provides a passage switching type flow-regulating and water-controlling segmented acidizing tubular column, including:

a single-flow water control sieve tube; the sieve tube is provided with a base tube, a screen part arranged on the base tube and a flow regulating and water controlling part communicated with the screen part; the screen portion is used for filtering formation fluid; the flow regulating and controlling part is communicated with the downstream of the screen part and is used for increasing the flow resistance of water in formation fluid;

the single-flow ball-throwing fracturing sliding sleeve is connected with the single-flow water control sieve pipe; a central channel communicated with the base pipe and an acidification hole for communicating the central channel with the outside of the single-flow ball-throwing fracturing sliding sleeve are arranged in the single-flow ball-throwing fracturing sliding sleeve; the single flow pitching fracturing sleeve is configured to be operable to open and close the acidizing hole by an external well pressure.

In a preferred embodiment, the base pipe is further provided with a one-way component; the unidirectional assembly is configured to allow fluid to flow from the screen section to the flow-regulated water section, while preventing fluid from flowing from the flow-regulated water section to the screen section.

As a preferred embodiment, the screen part comprises an outer protective sleeve, a filter screen, a flow guide screen and a supporting layer which are sleeved from outside to inside in sequence; circular through holes are distributed on the outer protective sleeve; the flow guide net is used for guiding the fluid; the filter screen, the flow guide screen and the supporting layer are fixed into a whole through swaging.

In a preferred embodiment, the flow-regulating and water-controlling part comprises an outer pipe fixed on the outer side of the base pipe, a flow-regulating and water-controlling component mounted on the wall of the base pipe in the outer pipe; a flow-regulating and water-controlling space is formed between the base pipe and the outer pipe; the flow regulating and water controlling component communicates the interior of the base pipe with the flow regulating and water controlling space.

As a preferred embodiment, the unidirectional assembly comprises:

the overflowing sleeve is fixedly arranged in the outer pipe; the flow adjusting and controlling space is divided into an inner space and an outer space communicated with the screen mesh part in the radial direction by the overflowing sleeve; the flow regulating and water controlling component is used for communicating the inner space with the interior of the base pipe; the overflow sleeve is provided with a communication hole which communicates the inner space with the outer space;

the plugging piston and the first supporting spring are arranged in the outer space and slide along the axial direction; the plugging piston is provided with a plugging position for plugging the communication hole and an opening position for opening the communication hole; the first supporting spring axially supports the plugging piston to be located at the plugging position; the plugging piston is movable from the plugging position to the open position by being pushed by formation fluid.

As a preferred embodiment, a flow guide passage is formed between the screen portion and the base pipe; the lower end of the outer protective sleeve is connected with the upper end of the outer pipe through a butt plug; the butt plug is fixedly sleeved outside the base pipe, and a channel for communicating the flow regulating and controlling space with the flow guide channel is formed between the butt plug and the base pipe;

the lower end of the outer pipe is fixedly sleeved outside the lower joint; a baffle ring is fixedly connected between the outer pipe and the upper end of the lower joint; the baffle ring is fixedly sleeved at the rear end of the outer space; the rear end of the first supporting spring abuts against the blocking ring, and the front end of the first supporting spring abuts against the plugging piston; the first supporting spring is sleeved outside the overflowing sleeve.

As a preferred embodiment, the single-flow ball-throwing fracturing sliding sleeve is communicated with the lower end of the flow-regulating and water-controlling screen pipe;

the single current bowling fracturing sliding sleeve includes: the outer sleeve and the inner sliding sleeve are slidably sleeved in the outer sleeve; a central channel is formed inside the inner sliding sleeve, and a ball seat is fixed inside the inner sliding sleeve; a sliding block fixedly connected outside the inner sliding sleeve and a second supporting spring axially supporting the sliding block are arranged between the inner sliding sleeve and the outer sleeve; the sliding block is fixedly connected with the outer sleeve through a shearing pin; the outer sleeve is provided with the acidification hole; the inner sliding sleeve is fixed at the position for plugging the acidizing hole by the shearing pin;

when the ball seat is plugged by a shot, and the pressure in the central channel exceeds a certain pressure after being pressed, the ball seat drives the inner sliding sleeve and the sliding block to cut the shearing pin to move axially so as to open the acidizing hole, and the second supporting spring pushes the inner sliding sleeve to plug the acidizing hole again when the pressing is stopped.

As a preferred embodiment, the upper end of the outer sleeve is connected with an upper joint, and the lower end of the outer sleeve is connected with a lower joint; the position that the inner sliding sleeve will acidizing hole shutoff is: the upper end of the inner sliding sleeve is sleeved in the upper joint in a sealing manner, and the lower end of the inner sliding sleeve is sleeved in the lower joint in a sealing manner.

As a preferred embodiment, the single flow water control screen pipe and the single flow ball injection fracturing sliding sleeve form a flow regulating, water controlling and acidizing component;

the channel conversion type flow-regulating and water-controlling segmented acidizing tubular column is provided with a top packer, a plurality of flow-regulating and water-controlling acidizing assemblies, isolation packers connected with two adjacent flow-regulating and water-controlling acidizing assemblies, a shaft isolation valve and two-stage floating shoes.

The embodiment of the specification also provides a channel conversion type flow-regulating and water-controlling segmented acidizing tubular column which comprises a top packer, a plurality of flow-regulating and water-controlling acidizing components, a shaft isolation valve and a floating shoe, wherein the top packer, the plurality of flow-regulating and water-controlling acidizing components, the shaft isolation valve and the floating shoe are sequentially connected from top to bottom; wherein an isolation packer is arranged between every two adjacent flow regulating and controlling acidification components; the flow regulating, water controlling and acidifying component comprises a single-flow water controlling sieve pipe and a single-flow ball throwing fracturing sliding sleeve connected with the single-flow water controlling sieve pipe;

the single-flow water control screen pipe is provided with a base pipe, a screen part arranged on the base pipe and a flow regulating and water controlling part communicated with the screen part; the screen portion is used for filtering formation fluid; the flow regulating and controlling part is communicated with the downstream of the screen part and is used for increasing the flow resistance of water in formation fluid; the base pipe is also provided with a one-way component; the unidirectional assembly is configured to allow fluid flow from the screen section to the flow-regulating water section while preventing fluid flow from the flow-regulating water section to the screen section;

a central channel communicated with the base pipe and an acidification hole for communicating the central channel with the exterior of the single-flow ball-throwing fracturing sliding sleeve are arranged in the single-flow ball-throwing fracturing sliding sleeve; the single flow pitching fracturing sleeve is configured to be operable to open and close the acidizing hole by an external well pressure.

Has the advantages that:

the channel conversion type flow-regulating and water-controlling segmented acidizing tubular column provided by the embodiment is matched with the single-flow ball-throwing fracturing sliding sleeve through the single-flow water-controlling sieve tube, so that the production function of the original tubular column after acid fracturing is realized, the effect of controlling water to inhibit the edge and bottom water coning of an oil-gas well is achieved, the low-water-content production period of the oil-gas well is prolonged, the recovery ratio of the oil-gas well is improved, and the purposes of reducing operation procedures and saving process cost are achieved.

A plurality of sets of single-flow water control sieve tubes and single-flow ball-throwing fracturing sliding sleeves are arranged in the pipe column, so that the channel conversion type flow-regulating water-controlling segmented acidizing pipe column with segmented acid fracturing well completion and production and water control integrated functions can be put into the pipe column through one operation, and the problem that segmented acid fracturing and flow-regulating water-controlling integration cannot be realized by one pipe column is solved.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and the accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a flow regulating and water controlling component provided in an embodiment of the present application;

FIG. 2 is a perspective view of FIG. 1;

FIG. 3 is a schematic structural diagram of a flow regulating and water controlling component according to another embodiment of the present disclosure;

FIG. 4 is a cross-sectional view of FIG. 3;

FIG. 5 is a perspective view of FIG. 3;

FIG. 6 is a schematic structural diagram of a flow regulating and water controlling component according to another embodiment of the present disclosure;

FIG. 7 is a perspective view of FIG. 6;

FIG. 8 is a schematic view of a flow regulating and water controlling component according to another embodiment of the present application;

FIG. 9 is a perspective view of FIG. 8;

FIG. 10 is a schematic structural diagram of a flow regulating and water controlling component according to another embodiment of the present disclosure;

FIG. 11 is a perspective view of FIG. 10;

FIG. 12 is a schematic diagram of a channel switching flow regulating and controlling water staging acidizing column according to one embodiment of the present application;

FIG. 13 is a schematic view of a half-section of the check valve type water control screen of FIG. 12;

FIG. 14 is a schematic cross-sectional view of FIG. 13;

FIG. 15 is a schematic illustration of a portion of the screen of FIG. 13;

FIG. 16 is a schematic view of a half section of the single flow shot fracturing sleeve of FIG. 12;

FIG. 17 is a schematic cross-sectional view of FIG. 16;

FIG. 18 is a schematic view of the regulated flow water section of FIG. 13 during acid fracturing;

FIG. 19 is a schematic view of the regulated flow water section of FIG. 13 in a production process;

FIG. 20 is a schematic diagram of a one-way valve regulated flow controlled water acidizing string according to another embodiment of the present application;

FIG. 21 is a schematic view of a half-section of the check valve type water control screen of FIG. 20;

FIG. 22 is a schematic cross-sectional view of FIG. 21;

FIG. 23 is a schematic view of a half-section of the dual stage fracturing sleeve of FIG. 20;

FIG. 24 is a schematic cross-sectional view of FIG. 23;

FIG. 25 is a schematic view of the check valve arrangement of FIG. 21;

FIG. 26 is a schematic view of the state of FIG. 25 in the acid fracturing process;

FIG. 27 is a schematic view of the state of the production process of FIG. 25;

FIG. 28 is a schematic diagram of the construction of an adaptive fluidic acidification column provided in another embodiment of the present application;

FIG. 29 is a schematic illustration of a half section of the single flow frac-through assembly of FIG. 28;

FIG. 30 is a schematic cross-sectional view of FIG. 29;

FIG. 31 is a schematic cross-sectional view of the micro check valve of FIG. 29;

FIG. 32 is a schematic cross-sectional view of the rubber sealing boot of FIG. 29;

fig. 33 is a schematic cross-sectional view of the adaptive flow control water screen of fig. 28.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It should also be noted that, unless clearly defined otherwise, in the undefined terms of orientation, the terms "upper" and "lower" in this disclosure are to be understood as being defined in relation to the position of the wellhead in the proximity of two adjacent components, the component closer to the wellhead being located above the component farther from the wellhead, and different parts of the same component being defined in the proximity of the wellhead as well.

Referring to fig. 1 and 2, an embodiment of the present disclosure provides a flow regulating and water controlling component as an oil-gas-water three-phase inflow adaptive flow control water core control mechanism (AICD). This embodiment provides an adjustable flow and water control member (AICD) disposed in a well and adapted to receive an influent fluid.

The flow regulating and water controlling component is used as a fluid inflow control mechanism, and can reduce the proportion of the unnecessary fluid in the produced fluid by introducing relatively large flow resistance and relatively large pressure drop to the unnecessary fluid (such as water in an oil and gas well) and introducing relatively small flow resistance and relatively small pressure drop to the required fluid (such as oil and gas in the oil and gas well), so that the oil and gas well can keep high-efficiency production.

The flow regulating and water controlling component comprises a chamber 2, an outlet 3 and at least one inlet 1. The chamber 2 has a first end (an upper end when facing fig. 2, the first end being a radially outer end in the radial direction of the base pipe when mounted on the flow regulating and water controlling screen) and a second end (a lower end when facing fig. 2, the first end being a radially inner end in the radial direction of the base pipe when mounted on the flow regulating and water controlling screen), and the cross-section of the chamber is reduced along the extension of the chamber, the first end of the chamber 2 is a cylindrical chamber, and the second end of the chamber 2 is a cylindrical chamber having an inner diameter smaller than the first end. In the flow regulating and water controlling component, the diameter of an inlet 1 is as follows: diameter of outlet 3: the height of the flow channel is = 1.8-2.8. The height of the flow channel is the vertical height from the top of the chamber 2 to the outlet 3 when facing fig. 2, and may also be the vertical distance between the inlet 1 and the outlet 3 when facing fig. 2. Inner diameter of inlet 1 or inlet 1 flow channel: the maximum inner diameter of the cyclone chamber 2 is =1 and ranges from 4.5 to 7.5. The flow-regulating and water-controlling component is in a step shape, and the outer diameter of the part of the flow-regulating and water-controlling component corresponding to the first end of the cavity is larger than that of the part of the flow-regulating and water-controlling component corresponding to the second end of the cavity, so that the flow-regulating and water-controlling component is conveniently positioned and installed in the communicating hole of the base pipe.

The chamber outlet 3 is the second end of the chamber. The inlet 1 has a transverse dimension for receiving fluid and delivering it towards the first end of the chamber 2, the inlet 1 being a linear flow path and opening into (the first end of) the chamber 2 in a generally tangential direction so as to generate a flow within the chamber 2 that rotates in a direction transverse to the chamber 2 towards the outlet. Meanwhile, an oil-water variable friction structure (damping structure) can be added between the inlet 1 and the first end of the chamber 2, so that the purpose of oil-gas-water separation is achieved.

The flow regulating and water controlling component has more favorable pressure and flow rate characteristics for ideal fluid (oil and gas) to be produced. When the inflow fluid is oil, because the density of the oil is relatively small and the viscosity is relatively large, the speed of the formed jet flow is relatively small, the rotation increasing effect in the vortex cavity is limited, the oil flows out from the central outlet 3 quickly, and the throttling resistance generated in the whole device is relatively small; when water enters the water control device, because the density of the water is relatively large, the viscosity is small, the inertia force is large, the speed of the formed jet flow is relatively large, the rotation increasing effect in the vortex cavity is obvious, high-speed vortex flow is formed in the vortex cavity 2, and then large throttling resistance is generated

The flow regulating water control member comprises a vortex inducer at the inlet 1 which generates jets of the incoming fluid and directs these jets into the chamber 2 of the flow regulating water control member. Inside the chamber 2, the jet generates a rotating flow as well as an axial flow, which is transformed towards the outlet 3 of the chamber 2. In the rotating chamber 2, the gravitational potential energy of the fluid is converted into the motion potential energy rotating towards the center, and the motion potential energy of the tangential motion is converted into the throttling resistance generated by the whole flow regulating and water controlling component at the central outlet 3, so that the resistance of the whole water controlling device to water is larger, the throttling resistance formed by oil in the throttling piece due to the larger viscosity is relatively smaller, and the viscosity force and the inertia force of gas are both small, so that the throttling resistance formed in the water controlling device is also very small.

The flow regulating and water controlling component is of an integrated structure and is made of a material which is suitable for underground environment and has strong structural integrity, such as steel or tungsten carbide, and can be formed by machining, injection molding, casting and the like. The device is small and exquisite in overall size, the height is 14-18mm, the diameter of an upper section is 18-20mm, the diameter of a lower section is 4-6mm, the diameter of an outlet 3 is 1.6-4.5mm, the outer portion of the lower end of the device is in a threaded design, and the device is convenient to install on an oil-gas well pipe column.

Fig. 1 and 2 show a transverse cross-section and a 3-dimensional view, respectively, of a dual inlet 1 swirl structure. It can be seen from the figure that the structure comprises two fluid inlets 1, the two inlets 1 respectively feed tangential jets into a vortex chamber 2, and it can be seen from fig. 2 that the vortex chamber 2 is an internal chamber 2 of an inverted cone type, the inlets 1 penetrate the wall of the chamber 2, and the second end of the chamber 2 is a fluid outlet 3.

The swirling flow in the flow regulating and water controlling part forms a low pressure area in the eye area closest to the axis. The higher viscosity oil rotates at a lower speed and the lower viscosity fluid (e.g., gas or water) rotates at a much higher speed, and the lower pressure at the eye effectively dampens the fluid flow. Thus, the flow regulating and water control member reacts primarily to fluid viscosity, the induced rotational flow causes a pressure drop, and the extent of the pressure drop is a function of the fluid characteristics of the flow, the intensity of the flow reduction increasing with decreasing fluid viscosity, reaching a maximum in the pure gas flow.

Referring to fig. 3 and 4, another embodiment of the present disclosure further provides a flow regulating and water controlling component, which increases the design of long and short flow passages compared to the flow regulating and water controlling component of fig. 1 and 2. Fig. 3 and 4 are a front view and a transverse sectional view of the long and short flow channel structure, respectively. The flow regulating and water controlling part comprises four cylindrical inlet flow passages, and the lengths of the flow passages are different (the inlet flow passages comprise a short flow passage 4 and a long flow passage 5). The short flow passage 4 and the long flow passage 5 are converged and then reach the inlet end 6 of the rotational flow cavity through one-time diameter reduction. The inlet end 6 communicates between the short flow passage 4, the long flow passage 5 and the chamber 7. The flow area of the inlet end 6 is smaller than the sum of the flow areas of the short flow passage 4 and the long flow passage 5. Diameter of the long flow passage 5: short flow channel 4 diameter = 1-1.4. Length of long flow path 5: short flow channel 4 length = 3-5.5.

The second end of the cyclone chamber 7 (the second end is a radial inner end when being installed on the flow-regulating and water-controlling sieve tube, and the second end can be used as a stepped through hole inserted into the wall of the base tube for positioning and installation) is a fluid outlet 8, wherein the cyclone chamber 7 is an inverted conical inner chamber, and has the same structure as the inner chamber of the double-inlet cyclone structure in fig. 1 and 2. Fig. 5 is a three-dimensional view of a long and short runner structure.

Long and

short runner

4, 5 on the basis of the regulation and control water that is keeping two entry whirl structures, two entry runners have newly been increased, can effectively increase oily area, the reduction device is to the resistance of oil, design through long and short runner reduces the regional formation of torrent simultaneously, and simultaneously, a whole structure has increased a plurality of local throttle mechanisms, make the resistance to water increase substantially, further strengthen the control function to water, the undergauge of entry end 6 then can effectively increase the velocity of flow, make the fluid form the efflux that flows along whirl chamber tangent plane more easily. The structure further enhances the control resistance of water, and the pressure ratio of water-oil overflowing is further enlarged.

In order to further increase the pertinence of oil, gas and water control, an oil-gas-water adaptive flow control water regulating component with a multi-branch flow passage structure is established by a method of adding branch flow passages. As shown in fig. 6 and 7, an embodiment of the present disclosure also provides an adaptive hydrocarbon-water flow control water regulating component of a multi-branch flow passage structure. Wherein, fig. 6 and 7 are a top perspective view and a longitudinal perspective view of the multi-branch flow channel structure, respectively. Fig. 7 is a three-dimensional view of a multi-branch flow channel structure.

The flow regulating and water controlling member comprises two rectangular inlet channels 9. The cross-sectional area of the rectangular inlet channel 9 is of rectangular configuration. A plurality of branch flow channels 10 and two flow guide channels 11 for guiding the fluid to make rotational flow movement in the rotational flow cavity 12 are arranged in the flow channel 9 along the inner extension, wherein, as shown in fig. 7, the height of the flow channel gradually decreases from the inlet flow channel 9 to the flow guide channels 11, and the flow channel has a certain descending gradient. The bottom end of the water regulating and controlling component is a fluid outlet 13.

Specifically, the inlet flow path 9 diameter (flow path width in the state shown in fig. 6): the diameter of the outlet 13 = 1.8-2.5. Inlet flow passage 9 diameter (flow passage width in the state shown in fig. 6): the branch flow channel 10 has a diameter (flow channel width in the state shown in fig. 6) =1 to 1.2. Inlet flow channel 9 inlet height: inlet channel 9 outlet height = 3. Wherein, the outlet of the inlet flow passage 9 is the inlet of the flow guide passage 11. The inlet channel 9 has a constant channel width in the state of fig. 6, and the flow channel 11 has a gradually decreasing channel width in the state of fig. 6.

The multi-branch flow guide structure is additionally provided with an oil-water flow distribution mechanism and an oil-water friction-variable structure in the inlet flow passage 9 on the basis of a flow regulating and water controlling mechanism with double-inlet rotational flow, so that the purposes of water control and oil stabilization are achieved. The branch flow channel 10 utilizes local friction resistance effect to play the role of oil passing and water blocking, the flow guide channel 11 utilizes on-way friction resistance effect to play the role of water passing and oil blocking, and meanwhile, the height difference of the inlet and the outlet of the flow channel enables water to more easily form jet flow flowing along the section of the rotational flow cavity. The structure promotes the fluid to flow to the fluid outlet 13 quickly for the relatively-high oil with relatively-low density in the rotational flow process, and the water with high density rotates along the rotational flow cavity, so that the water control and oil stabilization effects are achieved. In addition, the presence of the branch flow channel 10 further promotes the oil flowing out of the branch flow channel 10 to flow towards the central outlet in a straight manner, while the water flowing out of the flow guide channel 11 enters the swirl chamber more closely in a rotating manner, thereby creating a high throttling resistance in the center of the swirl chamber.

In order to further increase the comprehensive control capacity of water control, oil stabilization and gas production of the adaptive flow control water part, movable small balls can be arranged in the vortex cavities (the cavities of the flow control water part in fig. 1 to 7 can be called as vortex cavities) with three conical structures, and the movable small balls in the vortex cavities are made of different materials according to specific density requirements. When the density of the inflowing fluid is less than that of the small balls, the centrifugal force acting on the fluid is less than that acting on the small balls, and the small balls have a larger buoyancy correspondingly, so that the small balls rotate upwards around the cyclone chamber (i.e. the end farther away from the fluid outlet); conversely, when the density of the inflowing fluid is greater than the density of the pellets, the pellets will move toward the fluid outlet. The mechanism can use this effect to selectively produce or restrict fluid flow of different densities, such as gas production and water control, oil production and water control.

Three oil, gas and water three-phase self-adaptive flow control water mechanisms which are approximately conical are provided, and the conical flow control water adjusting part has the advantages of convenience in installation, large relative flow area of a rotational flow chamber and capability of increasing oil-water resistance change through conical vortex.

Considering the limit of the volume of the single conical throttling element, the passing area and the rotating vortex of the single conical throttling element are relatively small, and the disclosure also provides two embodiments of the flat plate-shaped adaptive flow control water part on the basis of the conical flow control water part for facilitating the field application. The flow regulating and water controlling component is used as a water controlling throttling element for regulating and controlling formation fluid.

Fig. 8 and 9 show a schematic structural diagram of a flat flow-regulating water control component. Fig. 8 and 9 are a top perspective view and a three-dimensional perspective view of a plate-type dual-inlet flow-regulating and water-controlling member, respectively. The flow regulating and water controlling member comprises two funnel-shaped inlet channels 14, two narrow flow accelerating channels 15, a flow swirling disc 16 and a central outlet 11. Wherein the fluid acceleration channel 15 is tangential to the spinning disk 16, as shown in figure 9. After the formation fluid flows into the flow regulating and water controlling part, the formation fluid enters the flow regulating and water controlling part from the inlet flow passage 14, and enters the central cyclone disk 16 after being intercepted and accelerated by the fluid accelerating channel 15, and the diameter ratio of the diameter of the central cyclone disk 16 to the diameter of the central outlet is as follows: (8.5-12) 1. Because the viscosity of the water is small and the density of the water is large, the water enters the cyclone disk 16 in the tangential direction to form high-speed cyclone in the cyclone disk 16, and according to the law of conservation of rotational momentum, the water forms high additional resistance through high-speed rotation in the cyclone disk 16, so that the additional pressure generated by the whole throttling element is increased; the oil, due to its high viscosity and relatively low density, is difficult to form a high-speed swirling flow in the swirl disc 16, like water, and thus flows out to the central outlet relatively quickly. The rotary liquid control of the central cyclone disk 16 of the whole set of throttling mechanism is very important. The ratio of the diameter of the cyclone disk 16 to the height of the whole flow regulating and water controlling part is as follows: 10-12, the length, width and height ratio of the flow channel accelerating channel 15 is: 9-11: 1.2 to 1.8.

Fig. 10 and 11 show another plate type flow control water control component. Fig. 10 and 11 are a top perspective view and a three-dimensional perspective view of the structure of the plate-type multi-branch flow-regulating and water-controlling component, respectively. The flow regulating and water controlling member comprises two funnel-shaped inlet channels 18, eight branch channels 19, two gradually narrowing guide channels 20, a fluid cyclone disk 21 and a central outlet 22.

Wherein eight branched runners 19 are divided by end surface projections as shown in fig. 11. The protruding structure (end face protrusion) and the diversion channel 20 at the same position form a vertical shape, and the end angle of the protruding structure in the incoming flow direction is a sharp angle, so that when the incoming flow is water with large inertia force, a vortex can be formed in the branch channel, the water is prevented from flowing into the branch channel, the water flowing into the throttling element is ensured to substantially completely (at least mostly) enter the diversion channel 20, and the diversion channel 20 is a channel which is gradually thinned from the inlet end to the outlet end. Specifically, the inlet end width of the flow guide passage 20: the outlet end width ratio is 3. The export of diversion channel 20 becomes tangent state with whirl disc 21, ensures that the stratum rivers that get into the orifice enter whirl disc 20 by the tangent line, and the diameter ratio of the diameter of central whirl disc 21 and central export is: (6.5-10.5) 1, because the viscosity of the water is low and the density is high, the water enters the cyclone disc 21 in the tangential direction to form high-speed cyclone in the cyclone disc 21, and according to the law of conservation of rotational momentum, the water forms high additional resistance through high-speed rotation in the cyclone disc 21, so that the additional pressure generated by the whole throttling element is increased; and because the viscosity of the oil is high and the density is relatively low, the oil entering the plate-type multi-branch flow guiding, adjusting and controlling water part can directly flow to the central outlet through the branch flow passage, and the additional resistance generated in the throttling element is relatively low. The ratio of the diameter of the rotational flow disk 21 to the height of the whole throttling mechanism (flow regulating and water controlling part) is as follows: 8.5-10.5, the flow channel accelerating channel has the following length, width and height ratio: 9-11: 1.2 to 1.8.

Referring to fig. 12 to 19, an embodiment of the present disclosure provides a flow-regulating and water-controlling acidizing device, in particular, a flow-regulating and water-controlling acidizing completion device for an oil and gas well. This oil gas well is with flow control accuse water acidizing completion device includes: a flow regulating and water controlling sieve tube 52; a single flow mechanism 53 connected to the flow regulating and controlling screen 52.

The screen 52 has a base pipe 522, a screen portion 524 disposed on the base pipe 522, and a flow control water portion 520 in communication with the screen portion 524. The screen portion 524 is used to filter formation fluids. The regulated flow and water control section 520 is in communication downstream of the screen section 524 for increasing the resistance to flow of water in the formation fluid. A central passage communicating with the base pipe 522 and an acidification port communicating the central passage with the exterior of the single flow mechanism 53 are provided in the single flow mechanism 53. The single flow mechanism 53 is configured to be operable to open and close the acidizing port by an uphole pressure. The single flow mechanism 53 only allows fluid flow from the central channel through the acidification port and out of the single flow mechanism 53. The single flow mechanism 53 may be installed at the upper end of the flow control screen 52, or may be installed at the lower end of the flow control screen 52, which is not limited in this application.

In order to realize the cooperation with the single flow mechanism 53 to ensure that the acid liquid enters the layer to be acidified through the acidification holes as much as possible during acid fracturing, the base pipe 522 is further provided with a one-way component. The unidirectional assembly allows the opposite direction of flow to the single flow mechanism 53. The one-way assembly is configured to allow fluid flow from the screen portion 524 to the flow regulating and water controlling portion 520, while preventing fluid flow from the flow regulating and water controlling portion 520 to the screen portion 524. The unidirectional assembly is upstream of the regulated flow water control component 534 in the direction of formation fluid flow.

In this embodiment, as shown in fig. 15, the screen portion 524 includes an outer protective sleeve 20, a filter screen 21, a diversion net 22, a filter screen 23, a diversion net 24, and a supporting layer 25, which are sequentially sleeved from outside to inside. Circular through holes are distributed on the outer protective sleeve 20. The filter screen 21, the diversion net 22, the filter screen 23 and the diversion net 24 form a filter layer. The

flow directing nets

22, 24 are used for directing the flow of fluid. The filter screens 21 and 23, the diversion screens 22 and 24 and the supporting layer 25 are fixed into a whole through swaging.

The flow regulating and water controlling section 520 includes an outer tube 528 fixed to the outside of the base pipe 522, and a flow regulating and water controlling member 534 installed on the wall of the base pipe 522 within the outer tube 528. The flow-regulating and water-controlling component 534 is a plate-type flow-regulating and water-controlling component in the above-mentioned embodiments, or a cone-type flow-regulating and water-controlling component. A flow-regulating and water-controlling space is formed between the base pipe 522 and the outer pipe 528. The flow regulating and water controlling member 534 communicates the interior 5220 of the base pipe 522 with the flow regulating and water controlling space. After entering the flow regulating and water controlling space, the formation fluid is throttled by the flow regulating and water controlling component 534 and then the oil gas is input into the base pipe 522.

In this embodiment, the flow-regulating and water-controlling acidizing completion device for the oil and gas well is a flow-regulating and water-controlling segmented acidizing tubular column 50, which can separate the stratum into a plurality of acidizing layers (strata), and can perform acid fracturing production operation for each acidizing layer (stratum) individually. The flow regulating and controlling sieve tube 52 and the single flow mechanism 53 constitute a flow regulating and controlling acidification component. The flow-regulating and water-controlling segmented acidizing string 50 is provided with a top packer 51, a plurality of flow-regulating and water-controlling acidizing assemblies, an isolation packer 54 connected with two adjacent flow-regulating and water-controlling acidizing assemblies, a shaft isolation valve 55 and a double-stage floating shoe 56.

In one embodiment, the flow and water regulating acidizing completion device for a hydrocarbon well is a channel switching flow and water regulating segmented acidizing string 50. The channel switching type flow-regulating and water-controlling segmented acidizing tubular column 50 comprises a top packer 51, a plurality of flow-regulating and water-controlling acidizing assemblies, isolation packers 54 connected with two adjacent flow-regulating and water-controlling acidizing assemblies, a shaft isolation valve 55 and a double-stage floating shoe 56.

Specifically, the passage switching type flow-regulating and water-controlling segmented acidizing tubular column 50 comprises: top packer 51, single flow water control screen 52, single flow ball injection fracturing sleeve 53, isolation packer 54, single flow water control screen 52, ball injection fracturing sleeve 53, well bore isolation valve 55, and bi-stage float shoe 56. The dual stage float shoe 56 includes a forward dual stage float shoe 56 and a reverse dual stage float shoe 56. The channel switching type flow-regulating and water-controlling segmented acidizing tubular column 50 isolates an upper acidizing layer and a lower acidizing layer, and acidizing and production work are correspondingly carried out.

As shown in fig. 13 and 14, the flow control screen 52 is a single flow control screen. The single flow mechanism 53 is a single flow ball injection fracturing sliding sleeve. The flow regulating and water controlling acidification device is a channel conversion type flow regulating and water controlling segmented acidification pipe column 50. The single flow water control screen 52 and the single flow ball injection fracturing sliding sleeve 53 form a flow regulating, water controlling and acidizing component.

In this embodiment, the single flow control screen 52 is comprised of a screen section 524, a flow control section 520, and a (adaptive) flow control water component 534 (AICD) mounted on the screen basepipe 522. The upper end of base pipe 522 is fixedly connected with coupling 521.

A flow guide passage is formed between the screen portion 524 and the base pipe 522. As shown in FIG. 15, the screen section 524 is composed of a three-layered structure with a circular outer protective jacket 20 on the outermost side. The outer protective sheath 20 protects the filter layer and ensures screen strength and reliability. The middle 2 nd to 5 th layers are filter layers. Among the filtration layers, the 2 nd and 4 th layers are fine filtration screens 21 and 23 (sand control filtration function). The 3 rd layer and the 5 th layer are precision diversion nets 22 and 24 (for diverting the inflowing liquid). The inner 6 th layer is a support layer 25, so that a sufficient flow area is ensured between the filter layer and the base pipe 522, and the three layers are subjected to swaging through a swaging process, so that the strength is improved by 74% compared with the traditional sieve pipe, and meanwhile, the cost is reduced.

An upper end ring 523 fixedly sleeved outside the base pipe 522 is fixedly connected to the upper end of the outer protective sleeve 20. The lower end of the outer protective sheath 20 and the upper end of the outer tube 528 are connected by a docking plug 525. The butt plug 525 is fixedly sleeved outside the base pipe 522, and forms a passage for communicating the flow-regulating and water-controlling space with the screen mesh part 524 (flow guide passage) with the base pipe 522. The lower end of the outer tube 528 is fixedly sleeved outside the lower joint 530 and fixedly connected through a set screw 531 to perform anti-rotation setting.

As shown in fig. 18 and 19, the one-way assembly of the single flow water control screen 52 comprises: a flow-through sleeve 527 fixedly arranged inside the outer tube 528, a blocking piston 526 and a first supporting spring 538. Wherein, a retaining ring 529 is fixedly connected between the outer pipe 528 and the upper end of the lower joint 530. The retainer ring 529 is fixedly secured to the rear end of the outer space 5272. The first support spring 538 bears with its rear end against the stop ring and with its front end against the blocking piston 526. The first supporting spring 538 is a cylindrical spring 538, and is sleeved outside the overflowing sleeve 527. The flow control jacket 527 radially partitions the flow control water space to form an inner space 5271 and an outer space 5272 in communication with the screen portion 524. The flow control water component 534 communicates the interior space 5271 with the interior of the base pipe 522. The overflowing casing 527 is provided with a communication hole 5270 for communicating an inner space 5271 with an outer space 5272.

The outer wall of the lower joint 530 is provided with a sealing ring 532 which is sealed between the lower end of the outer tube 528 and the lower joint 530 in a fitting manner, so as to seal the lower end of the outer space 5272. The upper end and the lower end of the overflowing sleeve 527 are respectively connected with an upper fixing ring (the upper fixing ring is fixedly sleeved outside the base pipe 522) and the upper end of the lower joint 530 in a sealing manner, and a sealing ring 533 is further arranged between the upper end of the overflowing sleeve 527 and the upper fixing ring and between the lower end of the overflowing sleeve 527 and the upper end of the lower joint 530. Sealing rings 535, 537 are provided on the inner and outer walls of the blocking piston 526, respectively, to block the communication hole 5270 in the initial position.

The outer and

inner spaces

5272, 5271 are annular spaces separated by the flow sleeve 527. The blocking piston 526 and the first support spring 538 are disposed in the outer space 5272. The blocking piston 526 slides axially within the outer space 5272. The blocking piston 526 has a blocking position for blocking the communication hole 5270 and an open position for opening the communication hole 5270. A first support spring 538 axially supports the blocking piston 526 in the blocking position. The plugging piston 526 is movable by formation fluid from the plugging position (fig. 18) to the open position (fig. 19).

The one-way assembly of single flow control screen 52 includes piston 526, first support spring 538, and flow sleeve 527. When acid fracturing is performed, as shown in FIG. 18, piston 526 normally blocks flowbore 5270 of flowsleeve 527 and acid cannot enter the formation through screen 52. During production, as shown in fig. 19, oil gas pushes the piston 526 to compress the spring 538, the communication hole 5270 of the overflowing sleeve 527 is opened, and formation oil gas finally enters the oil pipe through the water control and gas stabilization device and reaches the ground.

It can be seen that when the single flow water control screen of this embodiment is used for acidizing, the piston 526 blocks the communication hole of the flow sleeve 527, and acidizing fluid cannot enter the formation from the single flow water control screen. During production, fluid pushes piston 526 to compress spring 538, opening the passage, and the fluid finally enters the tubing through the water control device to the surface.

In this embodiment, as shown in fig. 16 and 17, the single flow mechanism 53 is a single flow ball injection fracturing sliding sleeve. The single-flow ball-throwing fracturing sliding sleeve 53 is communicated with the lower end of the flow-regulating and water-controlling sieve tube 52. The single flow pitching fracturing sliding sleeve 53 comprises: an outer sleeve 542 and an inner sliding sleeve 545 slidably sleeved inside the outer sleeve 542. The inner sliding sleeve 545 forms a central passage and is fixed with a ball seat 546. A slide block 543 fixedly connected to the outside of the inner sliding sleeve 545 and a second supporting spring 544 axially supporting the slide block 543 are arranged between the inner sliding sleeve 545 and the outer sleeve 542. The slide 543 is fixedly attached to the outer sleeve 542 by a shear pin 554. The outer sleeve 542 is provided with the acidification hole 540; the inner sliding sleeve 545 is secured in position by the shear pins 554 to block the acidizing hole 540.

The upper end of the outer tube 542 is connected to an upper connector 541, and the lower end of the outer tube 542 is connected to a lower connector 547, which is attached and sealed by a sealing ring 548. The positions where the inner sliding sleeve 545 blocks the acidification hole 540 (the positions shown in fig. 16 and 17) are as follows: the upper end of the inner sliding sleeve 545 is hermetically sleeved in the upper joint 541, and the lower end of the inner sliding sleeve 545 is hermetically sleeved in the lower joint 547.

The lower end of the upper joint 541 is fixedly connected within the upper end of the outer tube 542. The inner wall of the lower end of the upper joint 541 is provided with a limit step, and when the inner sliding sleeve 545 is located at an initial position, the upper end of the inner sliding sleeve 545 is limited by the upper joint 541 (the limit step) and is in sealing fit with the inner wall of the lower end of the upper joint 541. The outer wall of the inner sliding sleeve 545 is provided with a carrying step, the sliding block 543 is fixed between the inner sliding sleeve 545 and the outer sleeve 542, and the inner side and the outer side of the sliding block 543 are provided with sealing

rings

552 and 554 which are attached and sealed with the inner sliding sleeve 545 and the outer sleeve 542. The sliding block 543 is engaged with the carrying step and is pushed upwards by the second supporting spring 544 to be attached to the carrying step, so that the sliding block 543 and the inner sliding sleeve 545 move together in an axial direction. Ball seat 546 is secured to the inner wall of inner slide sleeve 545 by set screw 551. The inner wall of the upper end of the lower joint 547 has a sliding section for the inner sliding sleeve 545 to slide, and the inner wall is provided with a sealing ring 549 and a stopping step. The inner sliding sleeve 545 is pressed down until contacting the blocking step and cannot go down further, and the acidification hole 540 is opened. The inner wall of the upper end of the lower joint 547 is provided with a sealing ring 549 and is kept in sealing contact with the inner sliding sleeve 545. A sealing ring 550 is arranged between the ball seat 546 and the inner sliding sleeve 545 for sealing.

When the ball seat 546 is plugged by a ball, and the pressure in the central passage exceeds a certain pressure by pressing, the ball seat 546 drives the inner sliding sleeve 545 and the slider 543 to shear the shear pin 554 to move axially to open the acidizing hole 540, and when the pressing is stopped, the second support spring 544 pushes the inner sliding sleeve 545 to plug the acidizing hole 540 again.

The single-flow ball-throwing fracturing sliding sleeve 53 is sealed by steel bodies through the ball and the ball seat 546, and the inner sliding sleeve 545 (the sliding block 543) is pushed to cut the shearing pin 554 by pressing, so that the inner sliding sleeve 545 is opened, and the acidizing hole 540 is opened. After the pressure outside the well is stopped, the inner sliding sleeve 545 is reset under the action of the second supporting spring 544, and the acidification hole 540 is closed.

When the passage conversion type flow regulating and water controlling segmented acidizing tubular column 50 is applied, the following operation modes are adopted for implementation:

firstly, the pipe column 50 is lowered to a set position by a special lowering tool connected by a drill rod, automatic grouting is carried out through the shaft isolation valve 55 in the lowering process, and liquid enters the interior of the pipe column 50 through the hole of the shaft isolation valve 55 to keep the pressure balance of the interior and the exterior of the pipe column 50. After run-in the ball is thrown to close the wellbore isolation valve 55. At this time, the positive double-stage float shoe 56 can be opened; the reverse dual-stage float 56 is not activated.

After closing the wellbore isolation valve 55, the isolation packers 54 are set step by step. The tubing is being set, and after setting is completed, the packer 54 is isolated by seal testing. Pressing, checking and sealing the isolation packer 54 through the annulus, and if the pressure is stable, checking and sealing to be qualified; then set up through special setting instrument and seal the top and hang the packer, set and seal and accomplish and carry out annular space and test and seal, test and hang, to the sleeve pipe suppress test top packer 51 whether qualified, after top packer 51 tests to seal qualified, annular space is suppressed or corotation is released and is set a instrument.

When the lower layer (acidized layer) is acidized, acid-resistant soluble balls with proper sizes are thrown onto the ball seat 546 of the single-flow ball-throwing fracturing sliding sleeve 53 of the lower layer, the oil pipe is pressed, the ball seat 546, the inner sliding sleeve 545 and the sliding block 543 shear pin 554 are cut off, the inner sliding sleeve 545 is opened, the acidizing hole 540 is opened, the first layer of acidizing is started, at the moment, a flow passage communicated to the outer side of the single-flow water control sieve pipe is blocked by a piston, and acid liquor can only enter the stratum through the acidizing hole 540 of the single-flow ball-throwing fracturing sliding sleeve 53 to complete acidizing and dredge the stratum; after acidification is finished, pressing is stopped, the second supporting spring 544 abuts against the slide block 543, the slide block 543 pushes the inner sliding sleeve 545 and the ball seat 546 to reset, and the ball seat 546 recloses the sliding sleeve under the action of the second supporting spring 544.

When the upper layer (acidized layer) needs to be acidized, acid-resistant soluble balls with proper sizes are thrown on the ball seat 546 of the upper-layer ball throwing fracturing sliding sleeve 53, and other operations are consistent with the lower-layer acidizing operation.

The passage switching type flow-regulating and water-controlling segmented acidizing tubular column 50 can increase the number of acidizing layering layers by adding an isolation packer 54, a single-flow water-controlling sieve tube and a pitching fracturing sliding sleeve 53 with different sizes of the ball seat 546, so that fine layering is realized. During production, oil gas positively enters an annulus of the base pipe 522 through the filtering of a screen mesh section of the single-flow water control screen pipe, then the piston is pushed open, and the oil gas flows through the flow regulating and controlling component 534 (AICD) through the communication hole of the overflowing sleeve to enter the oil pipe and finally reaches the ground, so that the water control and gas stabilization production is realized.

The passage switching type flow-regulating and water-controlling segmented acidizing tubular column 50 of the embodiment has the following advantages:

(1) the layered acidification function is realized, 3 layers or more can be separated, and the acidification effect is better;

(2) the function of layered flow regulation and water control is realized, 3 layers or more can be separated, the pertinence of flow regulation and water control is strong, and the effect is good;

(3) the acidification channel and the water control channel are completely separated, the discharge capacity of the segmented acidification is large, the acidification efficiency is higher, and the water control pertinence is strong when fluid enters the flow regulating and water controlling device through the sieve tube during water control;

(4) the multi-layer acid fracturing and water control operation of the tubular column 50 is realized, the construction time is shortened, and the operation efficiency is improved;

(5) and the integration of sectional acidification, flow regulation and water control is realized.

Referring to fig. 20-27, in another embodiment of the present disclosure, the flow and water regulating and acidifying device is a check valve type flow and water regulating and acidifying string 60. The flow-regulating and water-controlling sieve tube 62 is a check valve type water-controlling sieve tube 62. The single flow mechanism is a double-stage fracturing sliding sleeve 63 connected to the lower end of the one-way valve type water control sieve tube 62.

The check valve type water control sieve tube 62 and the double-stage fracturing sliding sleeve 63 form a flow-regulating water-controlling acidification component. The one-way valve type flow-regulating and water-controlling acidizing string 60 is provided with a top packer 61, a plurality of flow-regulating and water-controlling acidizing assemblies, an isolation packer 64 connected with two adjacent flow-regulating and water-controlling acidizing assemblies, a shaft isolation valve 65 and a double-stage floating shoe 66.

As shown in fig. 20, the whole set of check valve type flow-regulating and water-controlling acid fracturing string 60 is an outer string mainly composed of the following tools, and the outer string 60 is schematically divided into an upper acidizing layer and a lower acidizing layer, and comprises from top to bottom: a top packer 61, a one-way valve type water control sieve tube 62, a double-stage fracturing sliding sleeve 63, an isolation packer 64, a one-way valve type water control sieve tube 62, a double-stage fracturing sliding sleeve 63, a wellbore isolation valve 65 and a double-stage float shoe 66.

In this embodiment, the one-way valve type water control screen 62 is composed of a screen portion 624 and a flow regulating and water controlling portion 620, and a (adaptive) flow regulating and water controlling part 631 (AICD) is installed on the screen base pipe 622. The upper end of the base pipe 622 is fixedly connected with a coupling 621.

As shown in fig. 15, the screen section 624 is composed of a three-layered structure with a round outer protective jacket 20 on the outermost side. The outer protective sheath 20 protects the filter layer and ensures screen strength and reliability. The middle 2 nd to 5 th layers are filter layers. Among the filtration layers, the 2 nd and 4 th layers are fine filtration screens 21 and 23 (sand control filtration). The 3 rd layer and the 5 th layer are precision diversion nets 22 and 24 (for diversion of the inflowing liquid). The inner 6 th layer is a support layer 25, so that a sufficient flow area is ensured between the filter layer and the base pipe 622, and the three layers are subjected to extrusion forging through an extrusion forging process, so that the strength is improved by 74% compared with the traditional sieve tube, and meanwhile, the cost is reduced.

As shown in fig. 21 and 22, an upper ring 623 fixedly sleeved on the base pipe 622 is fixedly connected to the upper end of the outer protective sleeve 20. The lower end of the outer protective sheath 20 and the upper end of the outer tube 626 are connected by a docking plug 625. A flow guide passage is formed between the screen portion 624 and the base pipe 622. The docking plug 625 is fixedly sleeved outside the base pipe 622, and forms a passage for communicating the flow-regulating and water-controlling space with the screen portion 624 (flow guide passage) with the base pipe 622. The lower end of the outer tube 626 is fixedly sleeved outside the lower joint 632 and fixedly connected by a set screw 634 to perform anti-rotation setting. The lower end of the outer tube 626 is also sealed by a sealing ring 635 to the lower fitting 632.

Base pipe 622 includes an upper base pipe 6220 and a lower base pipe 628. The lower end of upper base pipe 6220 and the upper end of lower base pipe 628 are fixedly connected by an intermediate joint. Screen portion 624 is disposed exteriorly of upper base pipe 6220 and flow control water portion 620 is at least largely disposed upon lower base pipe 628. The one-way assembly 630 is looped around the outer tube 626 and the (lower) base pipe 622 to axially space the flow-regulating and water-controlling space into a first axial space in communication with the screen portion 624 and a second axial space in communication with the flow-regulating and water-controlling member 631. The lower end of the lower base pipe 628 is connected to the inner side of the lower joint 632 through external threads, and is provided with a sealing ring 633 for sealing. The lower base pipe 628 constitutes a mounting base of the flow regulating and water controlling part 631. The flow-regulating and water-controlling component 631 may be a plate-type flow-regulating and water-controlling component or a conical flow-regulating and water-controlling component as in the above-described embodiments.

As shown in fig. 25, 26 and 27, the unidirectional assembly 630 includes: a first one-way ball seat 6301 and a second one-way ball seat 6302 which are axially coupled to each other. Sealing rings 629 are arranged on the inner side and the outer side (in the radial direction) of the first check ball seat 6301 and the second check ball seat 6302 to form sealing with the outer wall of the lower base pipe 628 and the inner wall of the outer pipe 626. Wherein the first one-way ball seat 6301 is disposed upstream of the second one-way ball seat 6302 in a formation fluid flow direction, the first one-way ball seat 6301 having a first number of first passages 6311 distributed in a circumferential direction. The second one-way ball seat 6302 has more than a first number of second passages 6321 distributed in a circumferential direction.

Specifically, the first number of second passages 6321 is axially aligned with the first number of first passages 6311, and the remaining number of second passages 6321 is offset from the first passages 6311. In the axially aligned first and

second passages

6311, 6321, the opposing snap-fit ends of the first and

second passages

6311, 6321 are each provided with a

ball seat

6312, 6322, and the opposing snap-

fit ball seats

6312, 6322 are provided with a ball stopper 636. The number of second passages 6321 may be twice the number of first passages 6311. The first one-way ball seat 6301 and the second one-way ball seat 6302 are butted with each other, and a butting gap may exist between them, and the axial length of the butting gap is smaller than the diameter of the plugging valve ball 636, and preferably smaller than the radius of the plugging valve ball 636.

The plugging valve ball 636 is a steel ball and can move along the axial direction. In the aligned first and

second passages

6311, 6321, the two

ball seats

6312, 6322 form a moving space for the ball 636, the ball 636 is advanced to close the first passage 6311, the first check ball seat 6301 is completely closed, and the check assembly 630 is closed. The ball 636 is moved back to block a portion (first number) of the second passages 6321, leaving the remaining number of second passages 6321 unblocked and the unidirectional assembly 630 open.

During acidizing, the one-way valve (one-way component 630) is closed, and acid cannot enter the stratum through the sieve tube but only can enter the stratum through the double-stage fracturing sliding sleeve 63. During production, the check valve 630 is opened, and fluid flows from the filter screen through the check valve (check assembly 630) and finally enters the oil pipe through the flow regulating and water controlling part 631 (AICD) to reach the ground. The check assembly 630 of the check valve structure is a

ball seat

6312, 6322 with two different hole numbers, and the plugging ball 636 cannot leave the

ball seat

6312, 6322. When acid fracturing is performed, as shown in an acid fracturing diagram 26, the ball 636 is completely fallen into the left ball seat 6312, and at the moment, the flow channel is completely blocked by the ball 636, so that the function that acidizing fluid cannot enter the stratum is realized. In production, as shown in production fig. 27, the plugging valve ball 636 is fully seated in the right ball seat 6322, but the number of holes on the right side is greater than that of the ball 636, the flow passage is opened, and formation oil and gas enter the oil pipe through the flow regulating and water controlling part 631 (flow regulating and gas stabilizing part) and reach the ground.

In the present embodiment, as shown in fig. 23 and 24, the dual-stage fracturing sliding sleeve 63 includes: a sliding sleeve body 651; the upper valve seat sliding sleeve 652 is slidably sleeved in the sliding sleeve body 651, and the lower valve seat sliding sleeve 653 is positioned below the upper valve seat sliding sleeve 652. The sliding sleeve body 651 is provided with the acidification hole 6510. The inner diameter of the lower seat runner 653 is smaller than the inner diameter of the upper seat runner 652. Accordingly, the diameter of the upper ball 659 is larger than the diameter of the lower ball 658, and the lower ball 658 can be seated on the lower valve sleeve 653 via the upper valve sleeve 652 to block the lower valve sleeve 653. The lower valve ball 658 is dropped to open the acidification hole 6510, which may be referred to as an acid pressure ball. The upper ball 659 is dropped to close off the acidification port 6510, which may be referred to as a shut-off ball. The lower seat runner 653 is positioned to block the acidizing hole 6510 by shear pins 654. The upper valve sleeve 652 is positioned above the lower valve sleeve 653 by shear pins 6511. The lower seat sleeve 653 can be pushed by pressure to open the acidizing hole 6510 after being plugged by a ball. The upper seat sliding sleeve 652 can be pushed by pressure to a position to re-block the acidizing hole 6510 after being plugged by a ball shot. The upper end and the lower end of the upper valve seat sliding sleeve 652 are respectively provided with a sealing ring which is in sealing contact with the inner wall of the sliding sleeve body 651, and the upper end and the lower end of the lower valve seat sliding sleeve 653 are respectively provided with a sealing ring 655 which is in sealing contact with the inner wall of the sliding sleeve body 651.

The double-stage fracturing sliding sleeve 63 controls the opening and closing of the acidizing hole 6510 through the upper and lower valve seat sliding sleeves with two stages of different inner diameters, the lower valve seat sliding sleeve 653 is opened, the lower valve seat sliding sleeve 653 moves downwards, and the acidizing hole is opened. The upper valve seat sliding sleeve 652 is opened, the upper valve seat sliding sleeve 652 moves downwards, and the acid fracturing hole is closed again. For example, the lower valve ball 658 (which is an acid-resistant soluble ball) has an outer diameter of 0.1in (2.54 mm) that is less than the minimum inner diameter of the upper valve seat sliding sleeve 652 to pass through the upper valve seat sliding sleeve 652.

The lower end of the sliding sleeve body 651 is connected with a lower joint 657. A sealing ring 656 is arranged between the lower end of the sliding sleeve body 651 and the lower joint 657. The part of the lower joint 657 extending into the lower end of the sliding sleeve body 651 is provided with a limit end 6571. The lower seat sliding sleeve 653 is axially restrained by the lower joint 657 when it is pushed into contact with the restraining end 6571 by a ball. When the upper valve seat sliding sleeve 652 is pushed into contact with the lower valve seat sliding sleeve 653 by ball throwing, the upper valve seat sliding sleeve is axially limited by the lower valve seat sliding sleeve 653, and the acidification hole 6510 is plugged again.

When the one-way valve type flow regulating and water controlling acidizing pipe column 60 is applied, the following operation mode is adopted for implementation:

firstly, the pipe column 60 is lowered to a set position by a special lowering tool connected with a drill rod, automatic grouting is carried out through the shaft isolation valve 65 in the lowering process, and liquid enters the interior of the pipe column 60 through the hole of the shaft isolation valve 65 to keep the pressure balance of the interior and the exterior of the pipe column 60. After running in place, the ball is thrown to close the wellbore isolation valve 65. At this time, the positive double-stage float 66 can be opened; the reverse twin float 66 is not.

After closing the shaft isolation valve 65, setting the isolation packer 64 step by step, pressing the setting of the oil pipe, and after the setting is finished, checking the isolation packer 64. Pressing through the annulus, and if the pressure is stable, checking that the seal is qualified; then set up through special setting instrument and seal the top and hang the packer, set and seal and accomplish and carry out annular space and test and seal, test and hang, to the sleeve pipe suppress test top packer 61 whether qualified, after top packer 61 tests to seal qualified, annular space is suppressed or corotation is released and is set a instrument.

When the lower layer (acidized layer) is acidized, an acid-resistant soluble ball is thrown onto the lower valve seat sliding sleeve 653 of the lower double-stage fracturing valve seat, the oil pipe is pressed, the lower valve seat sliding sleeve 653 shears the shearing pin, the lower valve seat sliding sleeve 653 moves downwards, the acidizing hole 6510 is opened, the first layer (lower acidized layer) acidizing is started, the flow channel communicated outwards through the one-way valve type water control sieve pipe 62 is closed, and acid liquor can only enter the stratum through the acidizing hole 6510 of the double-stage fracturing sliding sleeve 63 to complete acidizing and stratum dredging. After the acidizing is completed, the pressurizing is stopped, acid-resistant soluble balls with proper sizes are put into the upper valve seat sliding sleeve 652 of the lower double-stage fracturing valve seat, the upper valve seat sliding sleeve 652 shears the shearing pins, the upper valve seat sliding sleeve 652 moves downwards and is positioned at the upper end of the lower valve seat sliding sleeve 653, and at the moment, the upper valve seat sliding sleeve 652 just closes the acidizing hole 6510.

When the upper layer (acidification layer) needs to be acidified, the operation is completely consistent with the lower acidification operation.

The one-way valve type flow regulating and water controlling acidizing pipe column 60 can increase the number of acidizing layering layers by adding an isolation packer 64, a one-way valve type water controlling sieve pipe 62 and a two-stage fracturing sliding sleeve 63 with different ball seat sizes, and fine layering is realized.

During production, oil gas positively enters an annular space between the base pipe through the filtering of the screen mesh section of the check valve type water control screen pipe 62, then flows through the check valve, passes through the water control device (AICD), enters the oil pipe and finally reaches the ground, and the water control and gas stabilization production is realized.

The one-way valve type flow-regulating and water-controlling acidizing tubular column 60 of the embodiment has the following advantages:

(2) the construction method realizes one-time multilayer construction, shortens construction time and improves operation efficiency.

(3) Realizing the integration of acidification and water control;

(4) the tool completely adopts a mechanical structure and has reliable performance;

(5) the number of fracturing sections in one section is increased, and the pertinence of acid fracturing in the section is increased;

(6) and the opening and closing of the water control sieve tube 62 are realized by adopting the one-way valve, and the reliability is high.

Referring to fig. 28 to 33, in another embodiment of the present disclosure, the flow regulating and controlling acidification device is an adaptive flow regulating and controlling acidification column 70. The flow regulating and controlling sieve tube 73 is an adaptive flow regulating and controlling sieve tube 73. The single flow mechanism 74 is a single flow frac pass through assembly 74 attached to the upper end of the flow control and regulation screen 73. The single-flow fracturing pass-through module 74 and the adaptive flow control water sieve pipe 73 form a flow control water acidification module.

The adaptive flow control water acidification column 70 comprises a top packer 71 and a plurality of flow control water acidification components; wherein, the upper part and the lower part of each flow regulating, water controlling and acidifying component are provided with expansion packers 72. The adaptive flow control water sieve pipe 73 is further provided with a centralizer 75.

The integrated adaptive fluidic control water sieve tube 73 mainly comprises a sieve screen part 733 and an adaptive fluidic control water part, and the adaptive fluidic control water part 737 is installed on a base pipe of the adaptive fluidic control water part. The upper end of base pipe is fixedly connected with coupling 731.

The adaptive flow control water sieve tube 73 comprises a screen base tube 732 and a water control base tube 736. The screen base pipe 732 and the water control base pipe 736 are connected to form a base pipe. A flow guide passage 734 is formed between the screen portion 733 and the base pipe 732. A connection assembly 735 is fixedly attached to the exterior of base pipe 732. The connection assembly 735 fixedly connects the lower end of the outer protective sheath 20 and the upper end of the outer tube 738. The connecting assembly 735 is provided with a communicating passage for communicating the diversion passage 734 with the flow-regulating and water-controlling space.

As shown in fig. 15, the screen part 733 is mainly composed of a three-layer structure, and a circular hole outer protective sheath 20 is outermost. The outer protective sheath 20 protects the filter layer and ensures screen strength and reliability. The middle 2 nd to 5 th layers are filter layers. Among the filtration layers, the 2 nd and 4 th layers are fine filtration screens 21 and 23 (sand control filtration function). The 3 rd layer and the 5 th layer are precision diversion nets 22 and 24 (for diverting the inflowing liquid). The 6 th layer on the inner side is a supporting layer 25, so that a sufficient flow area is ensured between the filtering layer and the base pipe, and the filtering layer, the base pipe and the base pipe are subjected to extrusion forging through an extrusion forging process, so that the strength is improved by 74% compared with that of the traditional sieve pipe, and meanwhile, the cost is reduced.

The water control base pipe 736 is respectively connected with the inner wall of the outer pipe 738 at the two axial ends of the flow regulating and water controlling space. The water control base pipe 736 is further provided with a double-wall channel at the upstream of the flow regulating and water controlling space. A communication annulus is also provided between the upper end of the water control base pipe 736 and the connection assembly 735. The communication annulus communicates between the communication channel and the double-walled channel. A flow-regulating and water-controlling space is formed between the recessed portion between the upper end and the lower end of the water-controlling base pipe 736 and the outer pipe 738. A flow control water member 737 is mounted to the wall of the recess. The lower end of the water control base pipe 736 is further provided with a lower joint 739.

The adaptive flow control water part mainly comprises three parts, namely a water control base pipe 736, an outer pipe 738 and a flow control water part 737 serving as an adaptive flow core control part. Flow regulating and water controlling part 737 is welded or screwed on the upper part of the central hole of water controlling base pipe 736, self-adaptive flow regulating and water controlling part 737 is connected with special water controlling base pipe 736 in a threaded inserting mode, and is installed on the communicating central hole of flow regulating and water controlling space of water controlling base pipe 736, so that the connection flexibility of tools is ensured.

In this embodiment, as shown in fig. 29 and 30, the single flow frac pass assembly 74 includes: an outer cylinder 756. An inner tube 752 fixedly disposed within the outer cylinder 756. Wherein, the outer cylinder 756 is provided with the acidification hole and a micro check valve 755 arranged in the acidification hole. The interior of the inner tube 752 is configured as a central channel. The central passage has an exit orifice 7521. The outlet aperture 7521 is in communication with an intermediate annulus between the inner tube 752 and the outer cylinder 756. A rubber sealing sleeve 758 which covers the outflow hole 7521 outside the inner tube body 752 in a fitting manner is further arranged in the middle annular space. The rubber sealing boot 758 is capable of opening the outflow aperture 7521 when the pressure within the central passage exceeds a first predetermined pressure. The upper end of the outer cylinder 756 is connected to the lower end of the upper joint 751 through an external thread and sealed by a sealing ring 754. The upper end of the inner tube 752 is fixedly connected to the inside of the upper joint 751 and sealed by a sealing ring 753. Similarly, the lower end of the outer cylinder 756 is fixedly secured to the outside of the upper end of the lower fitting 762 and is sealed by a seal 760. The lower end of the inner tube 752 is fixedly sleeved in the upper end of the lower joint 762 and sealed by a sealing ring 761.

As shown in fig. 31, the micro check valve 755 includes: a valve body 7551 fixed in the acidizing hole, a baffle 7552 fixed to an outer end of the valve body 7551 in a radial direction, a valve ball 7555 positioned in the valve body 7551, and a spring 7553 positioned between the valve ball 7555 and the baffle 7552. The valve body 7551 has a valve body seat closed by the valve ball 7555 at a radially inner end. A guide 7554 is also provided in the valve body 7551. The guide 7554 is attached to the inner wall of the valve body 7551 to guide the movement of the valve ball 7555 and provide a support point for the spring 7553, facilitating the installation of the spring 7553. A spring 7553 is installed between the guide 7554 and the shutter 7552. Valve ball 7555 is seated between the valve body seat and guide 7554 and is urged against spring 7553.

Specifically, the miniature check valve is composed of a baffle 7552, a spring 7553, a guide body 7554, a valve body seat and a steel ball 7555, the whole structure is simple, the outside of the whole valve body 7551 is provided with threads, and the miniature check valve can be further installed on an outermost outer cylinder of the check fracturing passing assembly 74 through threaded connection, and the miniature check valve is small and flexible in whole structure and high in reliability. The micro check valve is in a low-pressure closed state in the tool running process, and the opening pressure is set to be 0.1-0.2MPa.

When in acidification, acidizing fracturing fluid is injected into a stratum, the injection pressure is greater than 0.2MPa, the check valve can be completely opened (acidizing hole), the minimum passing diameter of the whole check valve is 5mm, and then a single miniature check valve can pass through the fracturing fluid by more than 0.5m3 per minute under the driving pressure of 1MPa, so that the technical requirements of large-scale acidizing fracturing are met.

When in production, formation pressure acts on the miniature check valve 755, through the face seal between the steel ball 7555 and the valve body seat, the miniature check valve 755 can block the production differential pressure of 60MPa, and the closing of the miniature check valve 755 is ensured, so that fluid must enter the production string 70 after the flow control liquid is regulated through the integral self-adaptive flow control water sieve tube 73, the whole miniature check valve is integrally designed, no movable part is provided, the use reliability is high, and the application requirement can be met.

As shown in fig. 31 and 32, the single-flow fracturing pass module 74 performs double steel body sealing through the micro single-flow valve 755 and the rubber sealing sleeve 758, and in the process of acidizing, the pressure in the pipe pushes the rubber sealing sleeve 758 to expand and open outwards, so that the micro single-flow valve 755 is further pushed to open, the whole single-flow fracturing pass module 74 is opened, the acidizing channel is opened, and the inside and the outside of the pipe string 70 are communicated. After the pressurization is stopped, the micro check valve 755 is reset under the action of the spring 7553, the rubber sealing sleeve 758 returns to the original state, and the outflow hole is closed again. The single flow frac pass through assembly 74 acts as an opening and closing seal primarily with micro single flow valve 755 and rubber seal 758.

In order to install the rubber sealing sleeve 758, a fixing sleeve 757 is fixedly sleeved outside the inner tube body 752. The upper end of the fixing sleeve 757 is screwed outside the inner tube 752. The lower end of the fixed sleeve 757 is provided with a seal ring 759 which is fit and sleeved on the outer wall of the inner tube 752. A space for accommodating the rubber sealing sleeve 758 is formed between the upper end and the lower end of the fixing sleeve 757 and the outer wall of the inner tube 752. The fixed cover 757 is provided with an installation step at the upper end of this space to embed the upper end 7581 of the rubber sealing sleeve 758, whereby the rubber sealing sleeve 758 is axially limited. The fixing sleeve 757 is also provided with a connecting through hole 7571 on the outer wall of the space, and the connecting through hole communicates the space with the external annulus (the annulus between the outer cylinder and the inner cylinder).

The wall thickness of the rubber sealing sleeve 758 is stepped from the upper end to the lower end in the axial direction. Wherein, the wall thickness of the ladder positioned at the upper part is larger than that of the ladder positioned at the lower part. As shown in fig. 32, the upper end of the rubber sealing sleeve 758 has a thickness greater than the thickness of the intermediate portion 7582 and the lower end 7583, wherein the thickness of the lower end 7583 is the smallest. The rubber sealing sleeve 758 is of an annular sealing structure, the thickness of rubber is of a stepped arrangement structure, the structure is mainly suitable for the mode that the rubber sealing is opened from the outside to the inside gradually when acid liquid is injected into the rubber sealing sleeve, and smooth opening of the rubber sealing assembly in the acid injection process is guaranteed. During production, the rubber sealing sleeve 758 receives positive sealing pressure, and formation pressure ensures that the rubber sealing sleeve 758 can cling to the wall surface of the inner pipe body, so that leakage caused by poor sealing during gas production is ensured, and the working effect of the flow regulating and water controlling device is influenced.

During acidification, the single-flow fracturing passing assembly 74 is a main flow channel, most of the acidizing fracturing fluid enters the stratum through the single-flow fracturing passing assembly 74 and outside the flow channel pipe column 70, and less acid liquor enters the stratum through the self-adaptive flow control water sieve pipe 73; during production, the fluid pushes the single-flow fracturing through assembly 74 to close, and formation fluid must enter the oil pipe after being regulated by the adaptive flow control water device to reach the surface.

When the adaptive flow control water acidification column 70 is applied, the following operation modes are adopted for implementation:

firstly, the drill stem is connected with a special running tool to run the pipe column 70 to a set position, and in the running process, due to the communication between the inside and the outside of the self-adaptive flow control water sieve pipe 73, liquid can enter the inside of the pipe column 70 through the self-adaptive flow control water sieve pipe 73 to keep the balance between the inside and the outside of the pipe, and no extra tool or special operation is needed.

After the tool is in place, the packer is hung at the setting top through a special setting tool, annular sealing testing and hanging testing are carried out after setting, whether the top packer 71 is qualified or not is tested by pressing the casing, and after the top packer 71 is tested to be qualified, the setting tool is released by annular pressing or corotation.

Segmented acidification: and (2) pressurizing an oil pipe, pumping an acidizing fracturing fluid system, opening the single-flow fracturing passing assembly 74 along with the increase of the pressure of the inner pipe column 70, respectively enabling the acidizing fracturing fluid to enter the stratum through the single-flow fracturing passing assemblies 74 arranged at the front part, the middle part and the rear part of the whole self-adaptive flow control water well completion pipe column 70, and respectively realizing the segmented acidizing of the corresponding reservoir, wherein although the self-adaptive flow control water sieve pipe 73 is communicated internally and externally, most of the acidizing fracturing fluid enters the stratum through the single-flow fracturing passing assembly 74 because the trafficability of the single-flow fracturing passing assembly 74 is far better than that of the self-adaptive flow control water sieve pipe 73, the discharge capacity is large in the fracturing process, the pressure in the pipe is relatively high, and most of the acidizing fracturing fluid enters the stratum through the single-flow fracturing assembly 74, so that the segmented acidizing fracturing on the reservoir is realized, and the stratum is dredged. And after the acidizing is finished, stopping pressurizing, and closing the uniflow fracture again through the sliding sleeve under the action of the ground pressure.

The adaptive flow control water-acidizing string 70 can increase and optimize the number and the positions of acidizing layering layers by increasing the number and the positions of an oil-swelling packer 72, an adaptive flow control water sieve tube 73 and a single-flow fracturing passing assembly 74, so that fine layering is realized.

During production, oil gas enters the annular space of the base pipe through the filtering of the screen section of the adaptive flow control water screen pipe 73 in the forward direction, enters the oil pipe through a flow control water regulating part 737 (AICD) of the adaptive flow control water completion device and finally reaches the ground, and water control and gas stabilization production is realized.

The adaptive flow control water acidification column 70 of the present embodiment has the following advantages:

(1) the integrated design, the self-adaptive flow control water well completion pipe column 70 has simple structure and high reliability;

(2) the self-adaptive flow control water sieve tube 73 is simple in design structure, free of movable parts and long in service life;

(3) the reservoir is segmented by adopting the expansion packer 72, the packer setting and seal checking operation is not needed, and the safety and the construction simplicity of the whole process are improved;

(4) the self-adaptive flow control water sieve tube 73 is communicated internally and externally, and the pressure inside and outside the pipe column 70 is balanced in the running process of the tool, so that the safety is high;

(5) the single flow frac pass through assembly 74 is simple in construction and simple and reliable in opening and closing.

(6) The layered acidification function is realized, 3 layers and more can be formed, and the acidification effect is better;

(7) the acidification channel and the water control channel are completely separated, the discharge capacity of sectional acidification is large, the acidification efficiency is higher, and the water control pertinence is strong because fluid enters the flow regulating and water controlling device through the sieve tube during water control;

(8) the multi-layer acid fracturing and water control operation of the pipe column is realized, the construction time is shortened, and the operation efficiency is improved;

(9) and the integration of sectional acidification, flow regulation and water control is realized.

In summary, according to the flow-regulating, water-controlling, acidizing completion device and the matching tubular column 70 for an oil and gas well disclosed by the present disclosure, after a segmented acid fracturing production and water-controlling integrated tubular column 70 system is put in through one operation, the horizontal well segments are segmented by the swell seal of the isolation packer, so that the reservoir segments and the acid fracturing on different segments are realized, and the segmented acid fracturing function is realized, after the acid fracturing is completed, each horizontal segment is communicated with the reservoir, and the fluid outside the reservoir can enter the production tubular column 70 by selecting different types (self-adaptive) of flow-regulating and water-controlling screen pipes 73 according to the different adopted process technologies, and in the process of passing through the single flow-controlling screen pipe 73 or the one-way valve type water-controlling screen pipe 73 or the self-adaptive water-controlling screen pipe 73, the inflow speeds of fluids in different phase states are controlled by the inner wall surface rotational flow channel structure and the flat plate flow channel structure of the flow-regulating and by adding resistance twice to the inflow fluid, so as to achieve the purpose of non-resistance gas well, preferential production of oil phase production, and water-controlling production, and the purpose of water-regulating and realizing the purpose of water-controlling the water well, and solving the difficult problems of the segmented acid production and water production integrated process of the segmented production and the oil and water-controlling tool for the segmented oil and gas well with high acidity.

By putting the tool device with the integrated functions of segmented acid fracturing well completion, production and water control and the tubular column 70 system in one operation, the problems that the traditional long horizontal shaft has an unobvious acid fracturing production increasing effect, different horizontal segments produce gas unevenly and transversely after a period of segmented acid fracturing production, and the shaft is easily flooded by water cone entering at the bottom of the edge are solved.

Through the operation of one trip lower tubular column 70, realize the acid fracturing back simultaneously, former tubular column 70 carries out the function of production, it restraines along the horizontal well barrel limit end water coning effect to have the accuse water simultaneously, reach and reduce the operation process, practice thrift the process cost, furthest prevents the poisonous gas of complicated oil gas well completion operation process, the output of corrosive gas and the complicated operating mode difficult problem, guarantee production operation safety, realize the effect of the regional biggest extraction degree of various limit end water oil gas reservoirs and complicated high difficult oil gas reservoir horizontal well control, realize the well completion and the production optimization of oil gas well.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not a disclaimer of such subject matter, nor is it to be construed that the inventors do not consider such subject matter to be part of the disclosed inventive subject matter.

Claims

1. The utility model provides a passageway conversion formula is transferred and is flowed accuse water segmentation acidizing tubular column which characterized in that includes:

a single-flow water control sieve tube; the screen pipe is provided with a base pipe, a screen panel part arranged on the base pipe and a flow regulating and water controlling part communicated with the screen panel part; the screen portion is used for filtering formation fluid; the flow regulating and controlling part is communicated with the downstream of the screen part and is used for increasing the flow resistance of water in formation fluid;

the uniflow ball throwing fracturing sliding sleeve is connected with the uniflow water control sieve tube; a central channel communicated with the base pipe and an acidification hole for communicating the central channel with the outside of the single-flow ball-throwing fracturing sliding sleeve are arranged in the single-flow ball-throwing fracturing sliding sleeve; the single flow pitching fracturing sleeve is configured to be operable to open and close the acidizing hole by an external well pressure.

2. The passage-switching flow-regulating water-controlling segmented acidizing tubular column according to claim 1, wherein a one-way component is further arranged on the base pipe; the unidirectional assembly is configured to allow fluid flow from the screen section to the flow-regulating water section while preventing fluid flow from the flow-regulating water section to the screen section.

3. The passage switching flow-regulating and water-controlling segmented acidizing tubular column according to claim 2, wherein the screen part comprises an outer protective sleeve, a filter screen, a flow guide net and a supporting layer which are sleeved in sequence from outside to inside; circular through holes are distributed on the outer protective sleeve; the flow guide net is used for guiding flow of fluid; the filter screen, the flow guide screen and the supporting layer are fixed into a whole through swaging.

4. The passage switching flow-regulating and water-controlling segmented acidizing tubular column according to claim 3, wherein the flow-regulating and water-controlling part comprises an outer pipe fixed on the outer side of the base pipe, and a flow-regulating and water-controlling part mounted on the wall of the base pipe in the outer pipe; a flow-regulating and water-controlling space is formed between the base pipe and the outer pipe; the flow regulating and water controlling part is used for communicating the interior of the base pipe with the flow regulating and water controlling space.

5. The channel switching, flow regulating, water controlling, staged acidizing string of claim 4, wherein the one-way assembly comprises:

the overflowing sleeve is fixedly arranged inside the outer pipe; the flow adjusting and controlling space is divided into an inner space and an outer space communicated with the screen mesh part in the radial direction by the overflowing sleeve; the flow regulating and water controlling component is used for communicating the inner space with the interior of the base pipe; the overflow sleeve is provided with a communication hole which communicates the inner space with the outer space;

the plugging piston and the first supporting spring are arranged in the outer space and slide along the axial direction; the plugging piston is provided with a plugging position for plugging the communication hole and an opening position for opening the communication hole; the first supporting spring axially supports the plugging piston to be located at the plugging position; the plugging piston is movable by formation fluid from the plugging position to the open position.

6. The channel-switching, flow-regulating, water-controlling, staged acidizing string of claim 5, wherein a flow-directing channel is formed between said screen portion and said base pipe; the lower end of the outer protective sleeve is connected with the upper end of the outer pipe through a butt plug; the butt plug is fixedly sleeved outside the base pipe, and a channel for communicating the flow regulating and controlling space with the flow guide channel is formed between the butt plug and the base pipe;

7. The passage-switching flow-regulating and water-controlling segmented acidizing tubular column according to claim 5, wherein the single-flow ball-throwing fracturing sliding sleeve is communicated with the lower end of the flow-regulating and water-controlling sieve tube;

the single flow ball-throwing fracturing sliding sleeve comprises: the outer sleeve and the inner sliding sleeve are slidably sleeved in the outer sleeve; a central channel is formed inside the inner sliding sleeve, and a ball seat is fixed inside the inner sliding sleeve; a sliding block fixedly connected outside the inner sliding sleeve and a second supporting spring axially supporting the sliding block are arranged between the inner sliding sleeve and the outer sleeve; the sliding block is fixedly connected with the outer sleeve through a shearing pin; the outer sleeve is provided with the acidification hole; the inner sliding sleeve is fixed at the position for plugging the acidizing hole by the shearing pin;

when the ball seat is plugged by a ball, and the pressure in the central channel exceeds a certain pressure through pressing, the ball seat drives the inner sliding sleeve and the sliding block to cut the shearing pin to move axially to open the acidizing hole, and the second supporting spring pushes the inner sliding sleeve to plug the acidizing hole again when the pressing is stopped.

8. The channel-switching, flow-regulating, water-controlling, staged acidizing string of claim 7, wherein an upper joint is connected to an upper end of said outer casing, and a lower joint is connected to a lower end of said outer casing; the position that the inner sliding sleeve will acidizing hole shutoff is: the upper end of the inner sliding sleeve is hermetically sleeved in the upper joint, and the lower end of the inner sliding sleeve is hermetically sleeved in the lower joint.

9. The channel-switching flow-regulating and water-controlling segmented acidizing tubular column according to claim 1, wherein the single flow water-controlling screen and the single flow ball-throwing fracturing sliding sleeve form a flow-regulating and water-controlling acidizing component;

10. A passage switching type flow-regulating and water-controlling segmented acidizing tubular column is characterized by comprising a top packer, a plurality of flow-regulating and water-controlling acidizing components, a shaft isolation valve and a floating shoe which are sequentially connected from top to bottom; wherein an isolation packer is arranged between every two adjacent flow regulating and water controlling acidification assemblies; the flow regulating, water controlling and acidifying component comprises a single-flow water controlling sieve pipe and a single-flow ball throwing fracturing sliding sleeve connected with the single-flow water controlling sieve pipe;

a central channel communicated with the base pipe and an acidification hole for communicating the central channel with the outside of the single-flow ball-throwing fracturing sliding sleeve are arranged in the single-flow ball-throwing fracturing sliding sleeve; the single flow pitching fracturing sleeve is configured to be operable to open and close the acidizing hole by an external well pressure.