CN211851683U - Oil production pipe and production tree - Google Patents

Abstract

The utility model provides an oil production pipe and a Christmas tree, wherein the oil production pipe comprises an oil pipe and a sleeve pipe sleeved on the oil pipe, and an oil sleeve annulus is formed between the oil pipe and the sleeve pipe; the oil pipe is provided with a fixing part for connecting with a wellhead; the oil pipe is provided with at least one gas lift valve which is communicated with the oil pipe and the oil sleeve annulus so as to lead the gas in the oil sleeve annulus into the oil pipe; and an electric submersible pump unit is also arranged in the oil pipe and is positioned at one end of the oil pipe, which deviates from the well mouth. The utility model discloses a combination of gas lift valve and oily charge pump unit of diving, when the increase of the oil recovery degree of depth, the gas-liquid ratio in the well can increase, in partial gas can pass through gas lift valve entering oil pipe, the density of liquid between gas lift valve and the well head has been reduced, and then the pressure of gas lift valve and well head has been reduced, and the pressure of oily charge pump unit department of diving can be greater than well head department pressure, be convenient for oily charge pump unit of diving lifts liquid to well head department, when the efficiency of oily charge pump unit of diving has been improved, also increase the oil recovery volume of oil production pipe column.

Description

Oil production pipe and production tree

Technical Field

The utility model relates to an oil gas exploitation equipment technical field especially relates to an oil production pipe and production tree.

Background

In the process of collecting crude oil and natural gas, a production string is usually adopted to collect liquid and natural gas in an oil well, and the liquid and the natural gas in the oil well are lifted to the ground; and the oil extraction pipe column of the electric submersible pump is most commonly used at present.

In the related technology, the oil production pipe comprises a casing pipe, an oil pipe and an electric submersible pump unit, wherein the casing pipe is sleeved outside the oil pipe, and an oil casing annulus is formed between the inner wall of the casing pipe and the outer wall of the oil pipe; the electric submersible pump unit is arranged in the oil pipe, and liquid and natural gas are pumped out from the bottom of the oil well through the electric submersible pump unit.

However, as the depth of the oil well increases, the efficiency of the electric submersible pump unit decreases, thereby reducing the oil production of the oil production string and increasing the oil production cost.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides an oil production pipe and production tree to solve among the prior art oil production pipe oil recovery volume low, the oil recovery technical problem with high costs.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

an aspect of the embodiment of the utility model provides an oil production pipe, establish including oil pipe and cover sleeve pipe on the oil pipe, oil pipe with form the oil jacket annular space between the sleeve pipe.

The oil pipe is provided with a fixing part, and the fixing part is used for being connected with a wellhead.

The gas lift valve is used for communicating the oil pipe with the oil sleeve annulus so as to introduce gas in the oil sleeve annulus into the oil pipe.

And one end of the oil pipe, which deviates from the wellhead, is connected with an electric submersible pump unit.

The oil production pipe column as described above, wherein the oil pipe includes a plurality of first oil pipes connected in sequence, and one gas lift valve is disposed between two adjacent first oil pipes.

The oil production pipe column is characterized in that an eccentric working barrel is arranged between every two adjacent first oil pipes, the gas lift valve is arranged on the eccentric working barrel, and a plurality of through holes communicated with the oil sleeve annulus are formed in the eccentric working barrel.

The oil production string comprises the oil pipe hanger and the oil pipe cross joint, wherein the oil pipe cross joint is fixed on the well head, the oil pipe hanger is fixed in the oil pipe cross joint, and the oil pipe is fixed at one end, deviating from the well head, of the oil pipe hanger.

The oil production pipe column comprises a centrifugal pump, an oil-gas separator and a motor which are connected in sequence; the electric submersible pump unit also comprises a cable for supplying power to the motor.

The oil production string as described above, wherein one end of the centrifugal pump is screwed on the oil pipe; the other end of the centrifugal pump is connected with one end of the oil-gas separator through a flange; the other end of the oil-gas separator is connected with the motor.

The oil production pipe column is characterized in that a protector is further arranged between the motor and the oil-gas separator, and the protector is used for cutting off the current of the electric submersible pump unit when the electric submersible pump unit breaks down.

The oil production pipe is characterized in that one end of the motor, which is far away from the wellhead, is connected with a sieve pipe; and one end of the sieve tube, which deviates from the motor, is connected with a packer.

The oil production pipe is characterized in that one end, deviating from the sieve pipe, of the packer is connected with a sand control pipe, and one end, deviating from the packer, of the sand control pipe is connected with an anti-drop joint.

The embodiment of the utility model provides an on the other hand still provides the production tree, including the production tree body and as above oil production pipe column.

The utility model provides an oil production pipe and a Christmas tree, wherein the oil production pipe comprises an oil pipe and a sleeve sleeved on the oil pipe, and an oil sleeve annulus is formed between the oil pipe and the sleeve; the oil pipe is provided with a fixing part which is used for being connected with a wellhead; the oil pipe is provided with at least one gas lift valve, and the gas lift valve is used for communicating the oil pipe with the oil sleeve annulus so as to introduce the gas in the oil sleeve annulus into the oil pipe; still be provided with oily charge pump unit in the oil pipe, oily charge pump unit is located oil pipe deviates from the one end of well head. The utility model discloses a combination of gas lift valve and oily charge pump unit of diving, when the increase of the oil recovery degree of depth, the gas-liquid ratio in the well can increase, it is intraductal that partial gas can pass through gas lift valve entering oil, the density of liquid between gas lift valve and the well head has been reduced, and then the pressure of gas lift valve and well head has been reduced, at this moment, the pressure of oily charge pump unit department of diving can be greater than well head department pressure, be convenient for oily charge pump unit of diving lifts liquid to well head department, when the efficiency of oily charge pump unit of diving has been improved, also increase the oil recovery volume of oil production pipe column.

In addition to the technical problems, technical features constituting technical solutions, and advantageous effects brought by the technical features of the technical solutions described above, the embodiments of the present invention provide other technical problems that can be solved by the production string and the production tree, other technical features included in the technical solutions, and advantageous effects brought by the technical features, which will be described in further detail in the following detailed description.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural diagram one of an oil production string provided by an embodiment of the present invention;

fig. 2 is a second schematic mechanism diagram of the oil production string according to the embodiment of the present invention;

FIG. 3 is an enlarged partial schematic view of area A of FIG. 2;

FIG. 4 is an enlarged partial schematic view of region B of FIG. 2;

fig. 5 is a third schematic mechanism diagram of the oil production string provided by the embodiment of the present invention;

fig. 6 is a partially enlarged schematic view of the region C in fig. 5.

Description of reference numerals:

10: an oil pipe;

101: a first oil pipe;

20: a sleeve;

30: an oil jacket annulus;

40: a gas lift valve;

50: an oil pipe hanger;

501: a first connection portion;

502: a second connecting portion;

503: a third connecting portion;

60: a centrifugal pump;

70: an oil-gas separator;

80: a motor;

90: a cable;

100: a protector;

110: a screen pipe;

120: a packer;

130: a sand control pipe;

131: a filtration pore;

140: the joint is prevented from falling.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

In the case of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The oil production string is a main component in an oil production mechanical system and is used for lifting liquid and natural gas in an oil well to the ground, wherein the liquid refers to crude oil and moisture, and the oil production string of an electric submersible pump is most commonly used at present.

The oil production pipe comprises a sleeve, an oil pipe and an electric submersible pump unit, wherein the sleeve is sleeved outside the oil pipe, and an oil sleeve annulus is formed between the inner wall of the sleeve and the outer wall of the oil pipe; the electric submersible pump unit is arranged in the oil pipe, and liquid and natural gas are pumped out from the bottom of the oil well through the electric submersible pump unit.

However, with the increase of the depth of the oil well, the gas-liquid ratio in the oil well can be obviously increased, the content of gas entering the electric submersible pump unit can be increased, the lift, the discharge capacity and the efficiency of the electric submersible pump can be seriously influenced, even when the gas quantity is overlarge, most of the space of an impeller flow channel in the electric submersible pump is occupied by the gas, the electric submersible pump can stop discharging the liquid, the damage probability of the electric submersible pump unit is increased, and correspondingly, the maintenance time and the maintenance cost of an oil production pipe column can be obviously increased; in addition, when the air pressure at the bottom of the well is far greater than that at the top of the well, the liquid and the natural gas need to be lifted to the ground, and further, the pressure grade of the ground pressurization equipment needs to be improved, so that the equipment investment is large, and the production cost is increased.

Based on foretell technical problem, the embodiment of the utility model provides an oil production pipe and production tree through lifting two kinds of exploitation modes with the oily charge pump of gas lift and diving unite two into one, when having increased oil well exploitation efficiency, also improves the life of oily charge pump unit of diving.

Fig. 1 is a schematic structural diagram one of an oil production string provided by an embodiment of the present invention; fig. 2 is a second schematic mechanism diagram of the oil production string according to the embodiment of the present invention; FIG. 3 is an enlarged partial schematic view of area A of FIG. 2; FIG. 4 is an enlarged partial schematic view of region B of FIG. 2; fig. 5 is a third schematic mechanism diagram of the oil production string provided by the embodiment of the present invention; fig. 6 is a partially enlarged schematic view of the region C in fig. 5.

Referring to fig. 1 to 6, an embodiment of the present invention provides a tubing string, including an oil pipe 10 and a casing 20 sleeved on the oil pipe 10, wherein an oil casing annulus 30 is formed between the oil pipe 10 and the casing 20; the oil pipe 10 has a fixing portion for connection with a wellhead; the oil pipe 10 is provided with at least one gas lift valve 40, and the gas lift valve 40 is used for communicating the oil pipe 10 with the oil sleeve 20 annulus so as to introduce the gas in the oil sleeve annulus 30 into the oil pipe 10; the end of the oil pipe 10 departing from the wellhead is connected with an electric submersible pump unit.

In particular, the oil production string can be used in the technical field of oil exploitation, and is used for lifting liquid and natural gas in an oil well to the ground so as to achieve the purpose of oil exploitation.

The oil production string may comprise an oil pipe 10, the oil pipe 10 being arranged in an oil well and having a central bore, one end of the oil pipe 10 being connectable to a production tree on the ground and the other end being connected to an electrical submersible pump unit, and when the electrical submersible pump unit is in operation, liquid in the oil well may be lifted up into the production tree through the central bore. The tubing 10 has a fixing portion, through which the tubing can be fixed on the christmas tree, in this embodiment, the fixing portion can be a tubing head, and the tubing head is usually a large four-way pipe with flanges at two ends.

The sleeve 20 is sleeved on the oil pipe 10, the sleeve 20 is used for supporting the well wall of an oil well so as to guarantee the normal operation of the whole oil well after the drilling process and the well completion, the sleeve 20 is generally made of a steel pipe, the sleeve 20 can be fixed on the well head and also can be fixed on the oil pipe head through the sleeve head, and one end of the oil pipe, which deviates from the well head, penetrates through the sleeve and then extends into the oil well. An oil annulus 30 is formed between tubing 10 and casing 20, and oil annulus 30 is used to hold a volume of gas that has escaped from the reservoir.

The oil pipe 10 is further provided with a gas lift valve 40, wherein the gas lift valve 40 is used for communicating the oil pipe 10 and the oil casing annulus 30, because the pressure of the gas in the oil casing annulus 30 gradually rises along with the production, and when the pressure exceeds a certain value, the working state of the electrical submersible pump unit in the oil pipe 10 is affected, in the embodiment, the gas in the oil casing annulus 30 is introduced into the oil pipe by utilizing the design of the gas lift valve 40, and the pressure of the gas in the oil casing annulus 30 can be reduced to a range value required by normal production. In addition, the number of the gas lift valves 40 may be multiple, and the number of the gas lift valves 40 may be reasonably designed according to the depth of the oil well and the working power of the electrical submersible pump, which is not specifically limited herein.

The connected mode of gas lift valve 40 and oil pipe 10 can have multiple selection, for example, a plurality of gas lift valves 40 can the interval set up in oil pipe 10, can be provided with the trompil on the position that oil pipe 10 and gas lift valve 40 correspond, gas lift valve 40 can include the disk seat and set up the case on the disk seat, the through-hole has on the disk seat, when the atmospheric pressure increase in the oil jacket annular space, the case can deviate from the disk seat removal under the effect of annotating atmospheric pressure, so that through-hole and trompil intercommunication, and then make the aerial gas of oil jacket ring in-air via trompil and through-hole get into in the oil pipe. For another example, the oil pipe 10 is split and comprises a plurality of branch oil pipes, and accordingly, the gas lift valve 40 may be disposed between adjacent branch oil pipes, so that when the through hole is opened, the gas in the oil jacket ring will enter the oil pipe through the through hole.

The electric submersible pump unit is arranged at one end of the oil pipe 10, which is far away from a wellhead, wherein the electric submersible pump unit can be fixed on the oil pipe 10 or detachably connected on the oil pipe 10.

When the oil-gas-lift-type oil well is used, the oil production pipe column is installed in the oil well, the electric submersible pump unit is started, a centrifugal pump in the electric submersible pump unit starts to work, liquid and natural gas in the oil well are lifted to a Christmas tree on the ground, when the gas amount in the air of the oil jacket ring is increased, the pressure in the air of the oil jacket ring is increased, the gas lift valve is opened, and the gas in the air of the oil jacket ring is introduced into the oil pipe.

The embodiment of the utility model provides an oil production pipe, including oil pipe 10 and sleeve pipe 20 that the cover is established on oil pipe 10, form oil jacket annular space 30 between oil pipe 10 and the sleeve pipe 20; the oil pipe 10 has a fixing portion for connection with a wellhead; the oil pipe 10 is provided with at least one gas lift valve 40, and the gas lift valve 40 is used for communicating the oil pipe 10 and the oil casing annulus 30 so as to introduce the gas in the oil casing annulus 30 into the oil pipe 10; one end of the oil pipe, which is far away from the wellhead, is connected with an electric submersible pump unit. Under the conventional condition, one part of gas in the oil well passes through the electric submersible pump unit and is lifted to a Christmas tree on the ground through an oil pipe, the other part of gas is deposited in the oil jacket ring, when the gas-liquid ratio in the well is increased along with the increase of the oil extraction depth, and then the gas amount in the oil jacket ring space is increased, when the pressure exceeds a certain value, the gas lift valve is opened, the gas in the oil jacket ring space enters the oil pipe through the gas lift valve, on one hand, the gas amount in the oil jacket ring space is reduced, the influence on the working state of the electric submersible pump unit is reduced, on the other hand, part of gas enters the oil pipe through the gas lift valve, the density of liquid between the gas lift valve and a well head is reduced, and then the pressure between the gas lift valve and the well head is reduced, at the moment, the pressure at the position of the electric submersible pump unit is larger than the pressure at the well head, the electric submersible pump unit is convenient to lift the liquid, the oil production of the oil production string is also increased.

The oil pipe 10 can include the first oil pipe 101 that the multistage connects in order, set up a gas lift valve 40 between two adjacent first oil pipes 101, gas lift valve 40 can be connected with first oil pipe 101, also can be through being connected with first oil pipe of other parts, wherein, the quantity of first oil pipe 101 and the number phase-match of gas lift valve 40, when gas lift valve 40 is two, the number of first oil pipe 101 is three, wherein, a gas lift valve sets up between first oil pipe of first and second first oil pipe, another gas lift valve sets up between first oil pipe of second and third first oil pipe.

In the embodiment, through the design of the plurality of gas lift valves 40, gas in the oil casing annulus 30 can be ensured to enter the oil pipe 10 more smoothly, the pressure between the gas lift valves and a wellhead is reduced, and finally, the outlet pressure of the electric submersible pump unit is reduced, so that the electric submersible pump unit can be lowered to a deeper position of an oil well, and the purpose of deep pumping is achieved; in addition, the gas lift valves 40 are matched with an electric submersible pump unit for use, so that the lifting efficiency of the oil production pipe column can be improved rightly, and the oil production amount is improved.

An eccentric working barrel is arranged between two adjacent first oil pipes 101, the gas lift valve 40 is arranged on the eccentric working barrel, and a plurality of through holes communicated with the annular space of the oil sleeve are formed in the eccentric working barrel.

Eccentric working barrel is used for placing gas lift valve 40, the upper and lower both ends of eccentric working barrel have the external screw thread, internal thread has in the first oil pipe 101, eccentric working barrel passes through threaded connection between adjacent first oil pipe, wherein, eccentric working barrel can include the first barrel of connecting in order, second barrel and third barrel, and the diameter of second barrel is greater than the diameter of first barrel and second barrel, gas lift valve 40 can install on the second barrel through the sealing member, when gas lift valve 40 damages, can be with tool string below to third barrel department, take out gas lift valve 40, be convenient for gas lift valve 40's change or maintenance. In addition, the eccentric working barrel is provided with a plurality of through holes communicated with the oil sleeve annulus 30, so that gas in the oil sleeve annulus enters the oil pipe 10 after passing through the through holes and the gas lift valve.

As an alternative to the fixing part, the fixing part includes a tubing hanger 50 and a tubing cross-piece, the tubing cross-piece is fixed on the wellhead, the tubing hanger 50 is fixed in the tubing cross-piece, and the tubing 10 is fixed at an end of the tubing hanger 50 away from the wellhead.

As shown in fig. 3, a mounting step is provided in the oil pipe cross, the oil pipe hanger includes a first connecting portion 501, a second connecting portion 502 and a third connecting portion 503 which are connected in sequence, and the inner diameter of the second connecting portion 502 is greater than the inner diameters of the first connecting portion 501 and the third connecting portion 503, so that the lower surface of the second connecting portion 502 abuts against the mounting step, wherein the first connecting portion 501 and the third connecting portion 503 have external threads thereon, and the third connecting portion can be connected to the oil pipe by threads. In addition, the first connecting part, the second connecting part and the third connecting part can be all cylinders. Through the clamping between the second connecting portion and the installation step, the sealing connection between the oil pipe and the oil pipe cross is realized, and the operation is convenient.

The connection mode between the casing 20 and the oil pipe 10 can be connected in the following mode, the oil production string further comprises a casing cross joint and a casing hanger, the casing cross joint is mounted on the oil pipe cross joint through a flange, the casing hanger is fixed in the casing cross joint, the casing is fixed at one end of the casing hanger, which is far away from a wellhead, the oil pipe can penetrate through the casing cross joint, the casing hanger and the casing and then extend into an oil well, in addition, the connection mode of the casing cross joint, the casing hanger and the casing is the same as that of the oil pipe cross joint, the oil pipe hanger and the oil pipe, and the embodiment is not repeated herein.

The electric submersible pump unit comprises a centrifugal pump 60, an oil-gas separator 70 and a motor 80 which are connected in sequence; the electrical submersible pump assembly also includes a cable 90 for powering the motor.

The centrifugal pump 60 is a power mechanism of the oil production pipe column and is used for lifting liquid in the oil well to the ground, the centrifugal pump 60 can be provided with an inlet and an outlet, the inlet can be communicated with the oil casing annulus 30, the outlet is in threaded connection with the oil pipe 10, the inlet of the centrifugal pump 60 can be connected with a motor 80, an impeller of the centrifugal pump is driven by the motor 80 to rotate at a high speed, and centrifugal force is generated to lift the liquid in the oil well to the ground.

The centrifugal pump 60 may be a multistage centrifugal pump, that is, a plurality of single-stage centrifugal pumps may be connected in series to increase the set pressure of the submersible electric pump unit, so as to achieve the effect of the multistage centrifugal pump.

The pump shaft of the centrifugal pump 60 can be connected with the output shaft of the motor 80, so that the motor 80 rotates to drive the pump shaft and the impeller arranged on the pump shaft to rotate together to generate centrifugal force, and accordingly, liquid between the impeller blades rotates at high speed under the action of the centrifugal force, is discharged into the oil pipe through the outlet of the centrifugal pump, and is finally lifted to the ground through the oil pipe.

The electric submersible pump unit further comprises a cable 90 for supplying power to the motor, one end of the cable 90 is connected with a power supply device on the ground, the other end of the cable is connected with the motor 80, so that the working state of the electric submersible pump can be controlled by workers on the ground or the working state of the electric submersible pump can be known in time, the cable can be in communication connection with a control device on the ground, and the safety of the electric submersible pump unit is improved.

In order to reduce the influence of free gas on the centrifugal pump, an oil-gas separator 70 is arranged at the inlet of the centrifugal pump 60, and the gas contained in the liquid is mainly separated through the oil-gas separator 70, so that the phenomenon that the excessive gas enters the centrifugal pump to cause that most space of an impeller flow passage in the centrifugal pump is occupied by the gas, the centrifugal pump stops liquid discharge, and the damage probability of an electric submersible pump unit is increased. Wherein, oil and gas separator can include top connection, outer tube, bushing pipe, internal suction pipe and lower clutch, and the top connection is connected with the centrifugal pump, and the lower clutch is connected with the motor, has the entry on the outer tube, and liquid is at first through the outer tube through the internal suction pipe get into the centrifugal pump in, its separation principle is: because the inner surface of the inlet is rough, when gas mixed in liquid passes through, the gas can be subjected to shearing action, a part of gas is separated, liquid entering an annular space between the outer pipe and the inner pipe can generate swirling rotation, under the action of centrifugal force, the liquid and the gas mixed in the liquid are subjected to secondary separation, finally, the separated liquid enters the centrifugal pump, the separated gas is discharged into the air of the oil sleeve ring, and the gas is discharged into the oil delivery main line through the sleeve pipe gas discharge valve, so that the gas entering the centrifugal pump is reduced, the service life of the centrifugal pump is prolonged, and the efficiency of the centrifugal pump is improved.

One end of the centrifugal pump 60 is screwed on the oil pipe 10; the other end of the centrifugal pump 60 is connected with one end of the oil-gas separator 70 through a flange; the other end of the oil-gas separator 70 is connected to the motor 80, which facilitates the assembly and disassembly of the oil-gas separator 70.

A protector 100 is further arranged between the motor 80 and the oil-gas separator 70, and the protector 100 is used for cutting off the current of the electric submersible pump unit when the electric submersible pump unit fails.

As shown in fig. 2, the primary function of the protector 100 is to seal the submersible motor from liquids entering the motor; its upper end is connected with the oil-gas separator 70 and its shaft end is connected so that the weight of the pump shaft, the hydraulic load and the axial force of the impeller are all or partially transmitted to the thrust bearing of the protector, and its other end is connected with the motor 80. The protector 100 may employ any one of a conventional capsule type protector, a precipitation type protector, or a piston type protector.

The end of the motor 80 departing from the wellhead is connected with a sieve tube 110; the end of the screen 110 facing away from the motor 80 is connected to a packer 120.

As shown in fig. 4, the sieve tube 110 is used for separating impurities from the liquid and preventing the impurities from entering the motor, which affects the service life of the motor, wherein the sieve tube 110 may be a steel tube having a plurality of holes with a diameter of 3mm, through which the liquid enters. The inside diameter of the screen is 59mm and the outside diameter is 62 mm.

As shown in FIG. 2, a packer 120 is connected to the end of the screen 110 facing away from the motor 80, and the packer 120 is used to seal the oil jacket annulus 30 between the tubing 10 and the casing 20, wherein a threaded connection can be used between the screen 110 and the packer 120, and the packer 120 can be of the type that uses a double cup packer.

A sand control pipe 130 is connected to an end of the packer 120 facing away from the screen 110, and a drop prevention joint 140 is connected to an end of the sand control pipe 130 facing away from the packer 120.

As shown in fig. 5 and 6, the sand control pipe 130 is used to filter the fluid in the oil well and to block formation sand out of the sand control pipe, so that the sand content of the fluid entering the sand control pipe is reduced, thereby reducing damage to the motor 80 and the centrifugal pump 60. The sand control tubing 130 may be threaded into the screen 110 or may be attached in other ways. Wherein, a plurality of filtration pores 131 are arranged on the sand control pipe in an array.

Because the electric submersible pump and the motor are under long-time work, the connection between each part of the oil production pipe column is unstable, the parts fall off or break at the connection part, once the connection part of the electric submersible pump unit falls off or breaks, the electric submersible pump, the motor or other parts can fall to the bottom of the oil well, the salvaging difficulty is high in the salvaging process, and the salvaging cost can be increased. Accordingly, a drop sub 140 is provided at the end of the sand control tubing 130 opposite the packer 120 to support components in the production string and prevent the components from falling to the bottom of the well. The anti-drop joint comprises a first pipe section and a second pipe section, wherein the diameter of the second pipe section is smaller than that of the first pipe section and smaller than that of the oil pipe, so that components in the oil pipe are clamped on the second pipe section and cannot continuously fall down, and the anti-drop function is realized.

The utility model also provides a production tree, including production tree body and as above-mentioned oil production pipe column.

The Christmas tree body can be a common Christmas tree structure in the prior art and can comprise a plurality of branches, each branch can be provided with a valve, one end of the Christmas tree body close to a wellhead is connected with the oil production pipe column, and liquid in an oil well is lifted to the ground through the oil production pipe column.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description above, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A production string is characterized by comprising an oil pipe and a sleeve sleeved on the oil pipe, wherein an oil sleeve annulus is formed between the oil pipe and the sleeve;

the oil pipe is provided with a fixing part which is used for being connected with a wellhead;

the oil pipe is provided with at least one gas lift valve, and the gas lift valve is used for communicating the oil pipe with the oil sleeve annulus so as to introduce the gas in the oil sleeve annulus into the oil pipe;

and one end of the oil pipe, which deviates from the wellhead, is connected with an electric submersible pump unit.

2. The production string of claim 1, wherein the tubing comprises a plurality of first tubing sections connected in series, and one gas lift valve is disposed between two adjacent first tubing sections.

3. The oil production string according to claim 2, wherein an eccentric working barrel is arranged between two adjacent first oil pipes, the gas lift valve is arranged on the eccentric working barrel, and a plurality of through holes communicated with the oil casing annulus are formed in the eccentric working barrel.

4. The production string of claim 3, wherein the securing portion comprises a tubing hanger and a tubing spool, the tubing spool being secured to the wellhead, the tubing hanger being secured within the tubing spool, the tubing being secured to an end of the tubing hanger that faces away from the wellhead.

5. The oil production string according to any one of claims 1 to 4, wherein the electrical submersible pump unit comprises a centrifugal pump, an oil-gas separator and a motor connected in sequence;

the electric submersible pump unit also comprises a cable for supplying power to the motor.

6. The production string of claim 5, wherein one end of the centrifugal pump is threaded onto the tubing; the other end of the centrifugal pump is connected with one end of the oil-gas separator through a flange;

the other end of the oil-gas separator is connected with the motor.

7. The oil production string according to claim 6, wherein a protector is further arranged between the motor and the oil-gas separator, and the protector is used for cutting off the current of the electric submersible pump unit when the electric submersible pump unit fails.

8. The production string of claim 7, wherein a screen is connected to an end of the motor facing away from the wellhead;

and one end of the sieve tube, which deviates from the motor, is connected with a packer.

9. The production string of claim 8, wherein a sand control pipe is connected to an end of the packer facing away from the screen, and a drop prevention sub is connected to an end of the sand control pipe facing away from the packer.

10. A tree comprising a tree body and a production string according to any one of claims 1 to 9.

Images