CN113756774A - Fracturing and water control integrated pipe column and method for open hole well - Google Patents
Fracturing and water control integrated pipe column and method for open hole well Download PDFInfo
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- CN113756774A CN113756774A CN202010505705.4A CN202010505705A CN113756774A CN 113756774 A CN113756774 A CN 113756774A CN 202010505705 A CN202010505705 A CN 202010505705A CN 113756774 A CN113756774 A CN 113756774A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 198
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 238000010276 construction Methods 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims description 26
- 239000012530 fluid Substances 0.000 claims description 16
- 238000000605 extraction Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 238000012856 packing Methods 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 239000003129 oil well Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000010354 integration Effects 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 230000002708 enhancing effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 239000008398 formation water Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/32—Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells
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- Earth Drilling (AREA)
Abstract
The invention provides a fracturing and water control integrated tubular column for an open hole well, which comprises: a downhole casing; the fracturing water control mechanisms are arranged at the horizontal sections of the underground casing at intervals and comprise fracturing sliding sleeves and water control devices; the fracturing water control mechanisms are respectively positioned between the adjacent open hole packers; a bottom circulation assembly; the packer hanger is used for hanging and installing a downhole casing; wherein, under the first operating condition, a plurality of accuse water installation are closed, follow the farthest from the well head fracturing sliding sleeve begins to open each fracturing sliding sleeve in proper order for the inside passage of well casing pipe loops through corresponding fracturing sliding sleeve and switches on with the stratum, under the second operating condition, it is a plurality of fracturing sliding sleeve all closes, begins to open each accuse water installation in proper order from the accuse water installation of farthest from the well head, makes the inside passage of well casing pipe loop through corresponding accuse water installation and switches on with the stratum through the fracturing construction. The invention also provides a fracturing and water control integrated method for the open hole well.
Description
Technical Field
The invention belongs to the technical field of petroleum well completion and production, and particularly relates to an open hole fracturing and water control integrated tubular column. The invention also relates to a fracturing and water control integrated method for the open hole well.
Background
In the oil and gas exploitation process, fracturing operation is a very effective production increasing method, and particularly, layer transformation is an important means for increasing the production of low-permeability oil and gas reservoirs. In the prior art, sliding sleeve type staged fracturing is an important means for unconventional oil and gas resource exploitation, and is widely applied to fracturing yield-increasing transformation of vertical wells, horizontal wells and directional wells of low-permeability production layers and thin oil layers.
At present, although the existing open hole segmented sliding sleeve type fracturing tool can be lowered into a well bottom once without pulling out a pipe column, and is used as a production pipe column, the existing open hole segmented sliding sleeve type fracturing tool does not have a water control function. Especially, most oil fields are in an ultrahigh water-cut period integrally at present, and the situation of oil stabilization and water control is very severe. The water control difficulty of the horizontal well in the later period is high, and is influenced by factors such as 'heel-toe effect', reservoir heterogeneity, reservoir anisotropy, natural cracks and the like, the production profile of a long horizontal well is difficult to continuously and uniformly advance, and water/gas is prematurely leaked at the heel end of the oil well, a high permeability layer section and cracks to form a rapid channel, so that the oil production at other positions is inhibited, serious heel end effect and unbalanced liquid supply phenomena are very easily generated, a horizontal well section has a low-efficiency section, the horizontal well section cannot be effectively and fully used, and the recovery ratio of an oil field is seriously influenced.
In addition, the flow path of the existing inflow control devices is generally fixed, although the outflow of water/gas can be delayed, because the Flow Resistance Rating (FRR) is constant, once the water/gas cone occurs, the low-viscosity water/gas will occupy the whole wellbore and inhibit the flow of oil phase, thereby causing the production of oil well to be greatly reduced.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a fracturing and water control integrated tubular column for an open hole well, which can realize two functions of fracturing and water control simultaneously through a one-trip tubular column, thereby effectively solving the high water content problem and the water-gas coning problem of an oil well and greatly improving the oil reservoir recovery ratio.
The invention also provides a fracturing and water control integrated method for the open hole well.
To this end, according to a first aspect of the present invention, there is provided a fracturing and water control integrated string for an open hole well, comprising: a downhole casing; a plurality of fracturing water control mechanisms arranged at intervals on the horizontal section of the underground casing, wherein each fracturing water control mechanism comprises a fracturing sliding sleeve and a water control device arranged at the downstream of the fracturing sliding sleeve; the fracturing water control mechanisms are respectively and correspondingly arranged between the adjacent open hole packers; a bottom circulation assembly disposed at an end of the downhole casing; and a packing hanger for hanging installation of the downhole casing in a vertical section of the wellbore; the method comprises the steps that a plurality of water control devices are closed in a first working state, each fracturing sliding sleeve is opened in sequence from the fracturing sliding sleeve farthest from a wellhead, so that an internal channel of an underground casing is communicated with a stratum sequentially through the corresponding fracturing sliding sleeve, and in a second working state, each fracturing sliding sleeve is closed, each water control device is opened sequentially from the water control device farthest from the wellhead, so that the internal channel of the underground casing is communicated with the stratum subjected to fracturing construction sequentially through the corresponding water control device.
In one embodiment, a pressure difference sliding sleeve is arranged upstream of the bottom circulation assembly, and the water control device is arranged between the bottom circulation assembly and the pressure difference sliding sleeve.
In one embodiment, the water control device comprises: the side wall of the outer sleeve is provided with a plurality of through holes which are uniformly distributed along the circumferential direction; a water control valve installed in the through hole; and an inner switch sleeve disposed within the outer sleeve; wherein the internal switch sliding sleeve is configured to be axially movable to open or cover the through hole so as to control the water control valve to be opened or closed.
In one embodiment, a first clamping groove and a second clamping groove which extend outwards in the radial direction are arranged on the inner wall of the outer sleeve, the first clamping groove and the second clamping groove are arranged on two axial sides of the through hole, a clamping spring is arranged on the outer wall of the inner switch sliding sleeve,
the clamp spring can be correspondingly clamped in the first clamping groove or the second clamping groove when the switch valve is opened or closed, so that the inner switch sleeve is axially limited.
In one embodiment, the water control valve is provided with a variable flow channel, and the variable flow channel is configured to automatically adjust the size of the flow channel according to the fluid characteristics so as to increase oil and control water.
In one embodiment, the water control device further comprises an upper joint connected to the upper end of the outer sleeve, and the lower end of the outer sleeve is provided with a lower joint, and the water control device is connected to the downhole casing through the upper joint and the lower joint.
In one embodiment, the fracturing sliding sleeve adopts a hydraulic mechanical double-acting switch sliding sleeve which is opened by adopting a ball-throwing pressure-holding mode or adopting a switch tool, and the fracturing sliding sleeve can be opened or closed repeatedly.
In one embodiment, a tieback string is sealingly connected to the upper end of the isolation hanger for connection to a production tubing string.
According to a second aspect of the invention, there is provided an integrated fracturing and water control method for an open hole well, comprising the steps of:
the fracturing and water control integrated pipe column is lowered into an open hole;
closing the plurality of water control devices, injecting fracturing fluid from a wellhead, and sequentially opening the fracturing sliding sleeves from the fracturing sliding sleeve farthest away from the wellhead to perform staged fracturing construction until all fracturing of the horizontal shaft is completed;
and closing the plurality of fracturing sliding sleeves, and sequentially opening each water control device from the water control device farthest away from the wellhead to perform oil extraction and water control production.
In one embodiment, each of the water control devices can be repeatedly turned on and off during the production of oil production and water control.
Compared with the prior art, the invention has the advantages that:
the fracturing and water control integrated tubular column for the open hole well can simultaneously realize two functions of fracturing and flow regulation and water control through one tubular column, and can realize the yield increase transformation of unconventional oil and gas resources. Moreover, the tubular column can generate a uniform liquid production profile, so that the problems of high water content and water-gas coning of an oil well can be effectively solved, and the oil reservoir recovery rate is greatly improved. The water control device adopts an active water control valve, and can automatically adjust the size of a flow passage according to the property of the passing fluid so as to increase oil and control water, thereby obviously enhancing the effects of controlling water and increasing oil. The fracturing and water control integrated tubular column oil collecting well integrates fracturing, intelligent water prevention, water control, gas control and oil increase, effectively solves the problem of edge and bottom water coning, can separate most of water in a stratum particularly when being applied to a block with high water content, and greatly improves the output of other intervals, thereby obviously improving the recovery ratio of the whole shaft.
Drawings
The invention will now be described with reference to the accompanying drawings.
FIG. 1 shows the structure of a fracturing and water control integrated string for an open hole well according to the present invention.
Fig. 2 shows the structure of a water control device in the fracturing and water control integrated pipe column shown in fig. 1.
In the present application, the drawings are all schematic and are used only for illustrating the principles of the invention and are not drawn to scale.
Detailed Description
The invention is described below with reference to the accompanying drawings.
In this application, it should be noted that the section of the fracturing and water control integrated pipe string for open hole well according to the invention, which is lowered into the well bore far away from the wellhead, is defined as the lower end or the like, and the end close to the wellhead is defined as the upper end or the like.
FIG. 1 shows the configuration of a fracturing and water control integrated string 100 for an open hole well according to the present invention. As shown, the integrated frac and water control string 100 includes a downhole casing 6, the downhole casing 6 being used to transport oil produced from a wellbore. A plurality of fracturing water control mechanisms 10 are arranged in the downhole sleeve 6, and the plurality of fracturing water control mechanisms 10 are uniformly arranged at intervals along the axial direction of the downhole sleeve 6. When the fracturing and water control integrated pipe column 100 is lowered to the bottom layer of the shaft, the plurality of fracturing water control mechanisms 10 are positioned in the horizontal section of the open hole well. The fracturing water control mechanism 10 is used for performing fracturing and oil production water control operation.
As shown in fig. 1, the fracturing water control mechanism 10 comprises a fracturing sliding sleeve 5 and a water control device 2. As shown in fig. 1, the water control devices 5 are arranged axially spaced apart from each other downstream of the fracturing slide. The fracturing water control mechanism 10 carries out fracturing construction through the fracturing sliding sleeve 5 and carries out water control oil extraction operation through the water control device 2.
In one embodiment, the fracturing sliding sleeve 5 may be a hydro-mechanical double acting switch sliding sleeve. The fracturing sliding sleeve 5 can be opened by a ball-throwing pressure-holding mode or by a switch tool, and the fracturing sliding sleeve 5 can be repeatedly opened or closed. When the pitching opening mode is adopted, the ball seat can be a drillable ball seat or a dissoluble ball seat. In the practical application process, different pressure holding balls and ball seat materials can be selected according to the actual mining requirements.
Fig. 2 shows the structure of the water control device 2 in the water control integrated pipe column 100. As shown in fig. 2, the water control device 2 includes an outer sleeve 22. A plurality of through holes are provided on the side wall of the outer sleeve 22, and are uniformly distributed in the circumferential direction. And the water control valves 24 are correspondingly arranged in the through holes, and the water control valves 24 are used for increasing oil and controlling water. A first locking groove 251 and a second locking groove 252 extending radially outward are provided on the inner wall of the outer sleeve 22, and the first locking groove 251 and the second locking groove 252 are provided on both axial sides of the through hole. The first card slot 251 and the second card slot 252 will be described later.
According to the invention, the water control device 2 further comprises an inner switch sleeve 23 arranged on the outer sleeve 22. The inner switch sleeve 23 is configured in a cylindrical shape, and an outer diameter is set to be equal to an inner diameter of the outer sleeve 22. The inner switch sleeve 23 is configured to be axially movable to open or cover the through hole, thereby controlling the water control valve 24 to be opened or closed. In one embodiment, the end of the inner switch sleeve 23 is provided with a radially inwardly extending protrusion, thereby forming a claw-like structure. The inner switch sleeve 23 is axially moved using a switch tool in cooperation with a jaw-like structure to open or close the water control valve 24.
In order to ensure the sealing performance of the internal switch sleeve 23 for closing the through hole, a plurality of sealing grooves are formed in the outer wall of the internal switch sleeve 23 at intervals in the axial direction. A first seal 61 and a second seal 62 are mounted in the seal grooves, respectively. The first seal 61 and the second seal 62 are axially movable with the inner switch sleeve 23. When the through hole is closed by the inner switch sleeve 23, the first sealing element 61 and the second sealing element 62 are respectively positioned at two axial sides of the through hole, so that the sealing of the inner switch sleeve 23 on the through hole is effectively ensured, and the sealing performance of the interior of the tubular column is ensured.
As shown in fig. 2, a snap spring 25 is provided on the outer wall of the inner switch sleeve 23. The snap spring 25 can move axially with the inner switch sleeve 23. When the inner switch sleeve 23 moves axially to open or close the switch valve, the clamp spring 25 is correspondingly clamped in the first clamping groove 251 or the second clamping groove 252, so that the inner switch sleeve 23 is axially limited. From this, guarantee the stability of accuse water installation 2 to guarantee to increase oily accuse water effect.
In accordance with the present invention, water control valve 24 is an active water control valve. The water control valve 24 is provided with a deflector channel (not shown) configured to automatically adjust the size of the flow passage for oil increase and water control based on fluid characteristics, such as viscosity, velocity, density, etc., of the fluid. For example, when a fluid having a relatively low viscosity (e.g., water or gas) passes through the flow path, the flow path of the water control valve 24 is reduced, so that the fluid can be prevented from flowing excessively. When a fluid (such as oil) with a relatively high viscosity passes through, the flow passage of the water control valve 24 becomes large, thereby increasing the flow amount of the fluid. Therefore, the oil increasing and water controlling functions are achieved. By the water control valve 24, most of formation water can be effectively isolated in the formation, so that the recovery ratio of the whole shaft is obviously improved.
As shown in fig. 2, the water control device 2 further includes an upper joint 21 connected to an upper end of an outer sleeve 22. The lower end of the upper joint 21 is constructed as a stepped connection buckle and is provided with an external thread, and the inner wall of the upper end of the outer sleeve 22 is provided with an internal thread which can be matched with the external thread. The outer sleeve 22 is fixedly connected with the upper connector 21 through a threaded connection mode. In order to ensure the tightness of the connection between the outer sleeve 22 and the upper joint 21, a third seal 61 is provided between the connection faces of the outer sleeve 22 and the upper joint 21. The upper end of the upper joint 21 is configured as a negative taper coupler. Meanwhile, the lower end of the upper joint 21 is provided with a lower joint. In one embodiment, the lower end of the upper connector 21 is configured as a right-tapered connector link, thereby forming a lower connector. The water control device 2 is connected to the downhole casing 6 by an upper joint 21 and a lower joint.
As shown in FIG. 1, the frac and water control integrated string 100 also includes a plurality of open hole packers 4. The open hole packers 4 are arranged at equal intervals along the axial direction of the downhole casing 6, and the plurality of fracturing water control mechanisms 10 are respectively and correspondingly arranged between the adjacent open hole packers 4. The open hole packer 4 can effectively isolate the operation layer section of each fracturing water control mechanism 10, thereby effectively preventing the interference between layers and enhancing the fracturing construction effect and the oil extraction water control effect of the fracturing and water control integrated pipe column 100.
The integrated fracturing and water control string 100 further comprises a bottom circulation assembly 1 according to the present invention. As shown in fig. 1, the bottom circulation assembly 1 is disposed at the trailing end of a downhole casing 6. The bottom circulation assembly 1 can go into behind the design position under fracturing and accuse water integration tubular column 100, just circulate to replace the inside and outside drilling fluid of tubular column for completion fluid, later, make bottom circulation assembly 1 close through well head bowling, thereby keep apart fracturing and the inside and outside annular space of accuse water integration tubular column 100, from this, the inside of fracturing and accuse water integration tubular column 100 and then can suppress the pressure and separate hanger 7 and bore hole packer 4 with the seat.
As shown in fig. 1, a differential pressure sliding sleeve 3 is provided upstream of the bottom circulation assembly 1. And a water control device 2 is also arranged between the bottom circulation assembly 1 and the differential pressure sliding sleeve 3. In the first section fracturing construction process, need not to throw the ball and suppress the pressure, pressure differential sliding sleeve 3 can be opened through the mode of suppressing the pressure in the intraductal pipe to implement first section fracturing construction operation. In addition, pressure differential sliding sleeve 3 possesses the switch function, can close pressure differential sliding sleeve 3 through going into the switching tool down after the fracturing. The water control device 2 between the bottom circulation assembly 1 and the differential pressure sliding sleeve 3 can realize the first section water control after the differential pressure sliding sleeve 3 is closed.
In practical application, the fracturing and water control integrated tubular column 100 for the open hole well according to the invention is in a closed state in an initial state, namely the fracturing sliding sleeve 5, the water control device 2 and the differential pressure sliding sleeve 3. That is, prior to fracturing, the interior of the entire frac and water control integrated string 100 is not in communication with the external formation.
When fracturing and water control integration tubular column 100 carries out fracturing construction operation, a plurality of water control devices 2 are all closed to open pressure differential sliding sleeve 3 earlier, each fracturing sliding sleeve 5 is opened in proper order from fracturing sliding sleeve 5 that the farthest left the well head to rethread bowling suppressing pressure mode or adoption switching tool, makes the inside passage of sleeve pipe 6 in the pit loop through corresponding fracturing sliding sleeve 5 and stratum switch on. Thereby, a connecting passage between the wellbore and the formation is established, thereby performing a staged fracturing operation. At this time, the fracturing and water control integrated pipe string 100 is in a first working state, i.e., in a staged fracturing construction operation state.
After fracturing construction operation is completed, oil extraction water control production is carried out, each water control device 2 is sequentially opened from the water control device 2 farthest away from a wellhead by adopting a switch tool, and the pressure difference sliding sleeve 3 or the fracturing sliding sleeve 5 is correspondingly closed, so that the pressure difference sliding sleeve 3 and the plurality of fracturing sliding sleeves 5 are both in a closed state, the water control valves 24 in the water control devices 2 are both in an open state, and therefore the internal channel of the underground casing 6 is communicated with a stratum constructed by fracturing through the corresponding water control devices 2 in sequence. At this time, the fracturing and water control integrated pipe string 100 is in the second working state, i.e., in the oil production and water control state. Under the state, intervals of each stage of the fracturing water control mechanism 10 are isolated by the open hole packer 4, and the interlayer interference is effectively prevented.
The fracturing and water control integrated string 100 also includes a packing hanger 7 according to the present invention. Packer hangers 7 are provided in the vertical section of the wellbore for hanging installation of downhole casing 6 in the vertical section of the wellbore, thereby hanging installation of the integrated frac and water control string 100. An upper casing 9 is arranged at the vertical section of the shaft, and a water control integrated pipe column 100 is hung on the inner wall of the upper casing 9 through a packing hanger 7. The upper end of the packing hanger 7 is connected with a tie-back pipe column 8, the packing hanger 7 is in sealing connection with the tie-back pipe column 8, and the tie-back pipe column 8 is used for being connected with a production pipeline. At the same time, the packing hanger 7 is able to pack off the annulus formed between the upper casing 9 and the tieback string 8 and form a seal.
The invention also provides a fracturing and water control integrated method for the open hole well, which realizes fracturing and water control integrated construction by using the fracturing and water control integrated tubular column 100. The construction process of the integrated fracturing and water control method is described below.
First, the fracturing and water control integrated pipe string 100 is lowered into an open hole shaft until a target stratum is lowered, so that the plurality of fracturing water control mechanisms 10 are lowered into a horizontal section of the open hole shaft. Then, the underground casing 6 is hung and installed on the inner wall of an upper casing 9 of the vertical section of the open hole through a packing hanger 7, and the tie-back pipe column 8 is connected with a production pipeline, so that the hanging installation of the fracturing and water control integrated pipe column 100 is completed. Then, the horizontal section of the open hole well is divided into a plurality of horizontal sections through the open hole packer 4, and each fracturing water control mechanism 10 is correspondingly positioned in each horizontal section. And then, injecting fracturing fluid into the wellhead, opening the differential pressure sliding sleeve 3, and sequentially opening the fracturing sliding sleeves 5 from the fracturing sliding sleeve 5 farthest away from the wellhead, so that the internal channel of the underground casing 6 is sequentially communicated with the stratum through the corresponding fracturing sliding sleeves 5, and a connecting channel between the shaft and the stratum is established to perform staged fracturing operation. And in the fracturing construction process, the horizontal subsection far away from the wellhead is fractured firstly until the fracturing construction of the horizontal subsection is finished, and the fracturing fluid is stopped being injected. After fracturing construction is accomplished, close fracturing sliding sleeve 5 and pressure differential sliding sleeve 3, adopt the switching tool to begin to open each accuse water installation 2 in proper order from the accuse water installation 2 that is furthest away from the well head to correspond and close pressure differential sliding sleeve 3 or fracturing sliding sleeve 5, make the inside passage of sleeve pipe 6 in the pit loop through the accuse water installation 2 that corresponds and switch on with the stratum through fracturing construction, thereby carry out oil recovery accuse water production.
During the production process of oil production and water control, the water control device 2 can repeatedly move axially through the internal switch sleeve 23 so as to repeatedly open or close the water control valve 24. For example, when the water output of a certain section of the stratum is higher than the expected production value, the through hole can be closed by moving the inner switch sleeve 23 axially upwards by the switch tool, so that the water control valve 24 is closed, and the flow passage between the stratum and the shaft is completely closed. In this way, formation water can be effectively completely blocked in the formation to prevent a large amount of water from invading the wellbore and affecting the recovery efficiency of the entire wellbore.
The fracturing and water control integrated tubular column 100 for the open hole well can simultaneously realize two functions of fracturing, flow regulation and water control through one-time tubular column, and can realize the yield increase transformation of unconventional oil and gas resources. In addition, the fracturing and water control integrated pipe column 10 can generate a uniform liquid production profile, so that the problems of high water content and water-gas coning of an oil well can be effectively solved, and the oil reservoir recovery rate is greatly improved. The water control device adopts an active water control valve, and can automatically adjust the size of a flow passage according to the property of the passing fluid so as to increase oil and control water, thereby obviously enhancing the effects of controlling water and increasing oil. The fracturing and water control integrated tubular column oil collecting well integrates fracturing, intelligent water prevention, water control, gas control and oil increase, effectively solves the problem of edge and bottom water coning, can separate most of water in a stratum particularly when being applied to a block with high water content, and greatly improves the output of other intervals, thereby obviously improving the recovery ratio of the whole shaft.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and do not limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing examples, or that equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A fracturing and water control integrated string for an open hole well, comprising:
a downhole casing (6);
a plurality of fracturing water control mechanisms (10) arranged at intervals on the horizontal section of the underground casing, wherein each fracturing water control mechanism comprises a fracturing sliding sleeve (5) and a water control device (2) arranged at the downstream of the fracturing sliding sleeve;
the fracturing water control mechanism comprises a plurality of open hole packers (4) which are uniformly arranged on the horizontal section of the underground casing at intervals, and a plurality of fracturing water control mechanisms are respectively and correspondingly arranged between the adjacent open hole packers;
a bottom circulation assembly (1) disposed at the tail of the downhole casing; and
-a packer hanger (7) for hanging installation of said downhole casing in a vertical section of a wellbore;
wherein, in a first working state, the plurality of water control devices are all closed, and the fracturing sliding sleeves which are farthest away from a wellhead are sequentially opened, so that the internal channel of the underground casing is sequentially communicated with the stratum through the corresponding fracturing sliding sleeves,
and in a second working state, closing the plurality of fracturing sliding sleeves, and sequentially opening the water control devices from the water control device farthest away from the wellhead so that the internal channel of the underground casing is communicated with the stratum subjected to fracturing construction sequentially through the corresponding water control devices.
2. The integrated fracturing and water control pipe string according to claim 1, wherein a differential pressure sliding sleeve (3) is arranged upstream of the bottom circulation assembly, and the water control device is arranged between the bottom circulation assembly and the differential pressure sliding sleeve.
3. The fracturing and water control integrated string of claim 1 or 2, wherein the water control device comprises:
the side wall of the outer sleeve is provided with a plurality of through holes which are uniformly distributed along the circumferential direction;
a water control valve (24) mounted in the through bore; and
an inner switch sleeve (23) disposed within the outer sleeve;
wherein the internal switch sliding sleeve is configured to be axially movable to open or cover the through hole so as to control the water control valve to be opened or closed.
4. The integrated fracturing and water control pipe string according to claim 3, wherein a first clamping groove (251) and a second clamping groove (252) which extend outwards in the radial direction are arranged on the inner wall of the outer sleeve, the first clamping groove and the second clamping groove are arranged on two axial sides of the through hole, a clamping spring (25) is arranged on the outer wall of the inner switch sliding sleeve,
the clamp spring can be correspondingly clamped in the first clamping groove or the second clamping groove when the switch valve is opened or closed, so that the inner switch sleeve is axially limited.
5. The integrated fracturing and water control string as claimed in claim 3, wherein the water control valve is provided with a variable flow channel configured to automatically adjust the size of the flow channel according to the fluid characteristics for increasing oil and controlling water.
6. The integrated fracturing and water control string according to claim 3, wherein the water control device further comprises an upper joint (21) connected to the upper end of the outer sleeve, and the lower end of the outer sleeve is provided with a lower joint, and the water control device is connected to the downhole casing through the upper joint and the lower joint.
7. The integrated fracturing and water control pipe string according to claim 1, wherein the fracturing sliding sleeve is a hydro-mechanical double-acting switch sliding sleeve which is opened by a ball-throwing pressure-holding mode or a switch tool, and the fracturing sliding sleeve can be opened or closed repeatedly.
8. The integrated fracturing and water control string according to claim 1, wherein a tieback string (8) is sealingly connected to the upper end of the pack-off hanger for connection to a production tubing string.
9. A fracturing and water control integrated method for an open hole well comprises the following steps:
running the fracturing and water control integrated string of any of claims 1 to 8 into an open hole;
closing the plurality of water control devices, injecting fracturing fluid from a wellhead, and sequentially opening the fracturing sliding sleeves from the fracturing sliding sleeve farthest away from the wellhead to perform staged fracturing construction until all fracturing of the horizontal shaft is completed;
and closing the plurality of fracturing sliding sleeves, and sequentially opening each water control device from the water control device farthest away from the wellhead to perform oil extraction and water control production.
10. The integrated fracturing and water control method of claim 9, wherein each water control device can be repeatedly opened or closed during oil production and water control.
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| CN202010505705.4A CN113756774A (en) | 2020-06-05 | 2020-06-05 | Fracturing and water control integrated pipe column and method for open hole well |
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| CN202010505705.4A CN113756774A (en) | 2020-06-05 | 2020-06-05 | Fracturing and water control integrated pipe column and method for open hole well |
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