Electric pump oil extraction device with cable capable of being thrown and fished and using method

Abstract

The invention discloses an electric pump oil extraction device with a cable capable of being thrown and fished and a using method. A hanging seat is arranged on the upper portion of the inner wall of a sleeve, and a packer is arranged on the lower portion of the inner wall of the sleeve; an electric pump is hung at the bottom of the hanger; the bottom of the electric pump is connected with an oil pipe; one end of the cable penetrates through the Christmas tree, and the other end penetrates through the hanger and is connected with the electric pump; a sealing plug-in is arranged on the outer side of the hanger; a centralizing device is connected to the inner side of the packer, an elastic assembly is fixed to the inner wall of each of the opposite sides of the packer connecting piece, a U-shaped block is movably connected between the two oppositely-arranged right-angle components in a clamped mode, clamping extension parts are arranged at the two ends of the U-shaped block, and supporting elastic pieces are arranged between the clamping extension parts of the right-angle components. According to the invention, the risks of friction and collision between the electric pump and the cable and the wall of the oil pipe during tripping are reduced, the completeness of the electric pump and the cable in the tripping process and the heat dissipation performance during production operation can be better improved, the utilization rate of the oil pipe is reduced, and the production cost can be effectively reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of oilfield extraction equipment, specifically relating to an electric pump oil extraction device with a retrievable cable and its usage method. Background Technology

[0002] Submersible electric pump (SAP) oil recovery, a type of artificial lift oil recovery technology, consists of a multi-stage centrifugal pump and a pump unit directly connected to an electric motor. Power is supplied to the motor downhole via a power cable to drive the centrifugal pump, which pumps fluid from the well to the surface. It is suitable for medium- to high-yield oil wells with low gas and sand content in light oil or water-bearing crude oil. It boasts advantages such as large discharge capacity, high efficiency, and a high degree of automation, and is widely used in non-flowing high-yield wells, high water-cut wells, and offshore oil fields. Traditional SSP oil recovery technology has the following problems during well workover operations: First, because the traditional tubing is smaller than the SSP, and the SSP outlet is connected to the bottom of the tubing, when the SSP or cable fails and workover operations are required, a workover rig must be used to retrieve the tubing, cable, and SSP together, increasing operation time and costs. Second, the workover process involves replacing tubing, cables, and auxiliary equipment such as safety valves and packers, reducing the service life and utilization rate of these devices.

[0003] The patent application, with publication number CN113090209A, entitled "A Cable-Based Electric Pump Retrieval System," describes a method where an electric pump is suspended by a cable. When the pump needs to be retrieved, it can be removed by controlling the ground cable head outside the wellhead outlet. This method effectively protects the cable from damage during descent. However, in practical applications, the central axis of the wellhead and the tubing are not aligned, which may cause friction and collision between the pump and the tubing wall during descent, increasing production risks. Furthermore, the pump and suspension cylinder are not properly sealed, which can easily lead to seal failure and leakage, severely reducing pump efficiency. Summary of the Invention

[0004] In order to overcome the problems existing in the prior art, the purpose of this invention is to provide an electric pump oil extraction device and method for retrieving cables. By using casing to lower the pump and cooperating with a straightening device, the risk of friction and collision between the electric pump and the oil pipe wall during the raising and lowering process is reduced. This not only improves the integrity of the electric pump and the cable during the raising and lowering process and the heat dissipation during production operation, but also reduces the utilization rate of the oil pipe and can effectively reduce production costs.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An electric pump oil extraction device with a retrievable cable includes: a casing, a cable, and a hanger; a wellhead is provided at the top of the casing, a hanger seat is provided on the upper part of the inner wall of the casing, and a packer is provided on the lower part of the inner wall of the casing; a sealing insert is provided on the outside of the hanger, and the hanger is sealed to the hanger seat through the sealing insert; an electric pump is suspended at the bottom of the hanger, one end of the cable passes through the wellhead, and the other end passes through the hanger and is connected to the electric pump; an oil pipe is connected to the bottom of the electric pump; a straightening device is connected to the inner side of the packer, and the straightening device includes a packer connector; an elastic component is fixed to the inner wall of the opposite side of the packer connector, and the elastic component includes two opposing right-angle members, a U-shaped block is movably engaged between the two opposing right-angle members, the two ends of the U-shaped block have engaging extensions, and a supporting elastic element is provided between the engaging extensions of the right-angle members and the U-shaped blocks.

[0007] Optionally, the cable may be an armored cable.

[0008] Optionally, the cable passes through one end of the hanger, the cable armor is stripped, and the internal lead cable exits the hanger and connects to the electric pump.

[0009] Optionally, the top of the hanger is provided with a through-fixture.

[0010] Optionally, the sealing insert is matched with the suspension mount.

[0011] Optionally, the sealing plug is sealed to the suspension seat by a sleeved sealing element. Both the suspension seat and the sealing plug have annular grooves. One side of the sealing element is installed in the annular groove of the suspension seat, and the other side is installed in the annular groove of the sealing plug.

[0012] Optionally, the seal includes a metal seal and a non-metal seal, with the metal seal positioned above the non-metal seal.

[0013] Optionally, both outer extensions of the U-shaped block are provided with elastic element mounting grooves, and the supporting elastic element is installed in the elastic element mounting grooves.

[0014] Optionally, the supporting elastic element is a spring.

[0015] The method of using the electric pump oil extraction device with a retrievable cable includes the following steps:

[0016] The packer and centralizer are lowered into the wellbore to complete the setting of the packer and centralizer.

[0017] Pass one end of the cable through the hanger and the other end out of the tree. Then, pass the cable through the lead cable inside one end of the hanger and connect it to the electric pump.

[0018] The lower discharge pump causes the oil pipe to pass through two U-shaped blocks on the inner wall of the straightening device, and the oil pipe is squeezed and fixed by the supporting elastic element;

[0019] As the hanger approaches the hanger seat, reduce the lowering speed and lock the seals with the hanger seat and sealing insert.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In the process of electric pump oil production, when the cable or electric pump fails, the present invention can retrieve and replace the cable or electric pump without the need for workover rig operations. It features low pump inspection operation cost and short cycle, which can greatly reduce the cost of workover operations.

[0022] This invention employs a casing system, with the oil tubing placed inside the casing. The extracted crude oil flows through the tubing and then enters the casing for production. Compared to production methods that rely entirely on tubing, this not only reduces the risk of friction and collision between the electric pump and cables and the tubing wall during operation, but also improves the integrity of the electric pump and cables during operation and enhances heat dissipation. Furthermore, it reduces the utilization rate of the tubing, effectively lowering production costs.

[0023] This invention uses a straightening device to fix the electric pump, which not only effectively reduces the impact of vibration on the electric pump during production and ensures the stable operation of the electric pump, but also, compared with the method of suspending the electric pump by cable alone, the suspension device used in this process not only improves the sealing between the pump and the suspension cylinder and reduces the risk of leakage, but can also support part of the weight of the lower electric pump and oil pipe, which can greatly reduce the risk of fatigue fracture of the cable during production. Attached Figure Description

[0024] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings:

[0025] Figure 1 A schematic diagram of the cable retrieval pump process;

[0026] Figure 2 This is a schematic diagram of the suspension cylinder structure;

[0027] Figure 3 This is a schematic diagram of part of the straightening device;

[0028] In the diagram: 1. Christmas tree; 2. Casing; 3. Cable; 4. Hanger; 5. Hanger seat; 6. Sealing insert; 7. Electric pump; 8. Tubing; 9. Packer; 10. Centralizing device; 11. Metal seal; 12. Non-metal seal; 13. Right-angle component; 14. U-block; 15. Mounting groove; 16. Support elastic element. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0030] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0031] Unless otherwise defined, 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 pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] The present invention will now be described in detail with reference to the accompanying drawings.

[0033] like Figure 1 As shown, an electric pump oil extraction device with a retrievable cable according to the present invention includes:

[0034] An electric pump oil extraction device with a retrievable cable includes: a casing 2, a cable 3, and a hanger 4; a wellhead 1 is provided at the top of the casing 2, and a hanger seat 5 is provided on the upper part of the inner wall of the casing 2. The hanger 4 is sealed to the hanger seat 5 through a sealing insert 6. Specifically, the hanger 4 inside the casing 2 has a cavity above it.

[0035] A packer 9 is provided on the lower part of the inner wall of the casing 2; a sealing plug 6 is provided on the outer side of the hanger 4; an electric pump 7 is suspended at the bottom of the hanger 4; one end of the cable 3 passes through the tree trunk 1, and the other end passes through the hanger 4 and is connected to the electric pump 7; an oil pipe 8 is connected to the bottom of the electric pump 7; a straightening device 10 is connected to the inner side of the packer 9, and the straightening device 10 includes a packer connector; an elastic component is fixed on the inner wall of the opposite side of the packer connector, and the elastic component includes two opposing right-angle members 13, a U-shaped block 14 is movably engaged between the two opposing right-angle members 13, the two ends of the U-shaped block 14 have engaging extensions, and a supporting elastic member 16 is provided between the engaging extensions of the right-angle members 13 and the U-shaped block 14.

[0036] Specifically, the cable 3 passes through the hanger 4 and connects to the oil pipe 8. The cable 3 is an armored cable, with one end passing through the hanger 4 and the other end passing through the wellhead 1. The protective layer of the armored cable 3 is stripped from the end of the cable 3 that passes through the hanger 4, allowing the lead cable inside the armored cable 3 to emerge and connect to the electric pump 7.

[0037] The top of the hanger 4 is provided with a through-fixer, which provides a channel for the cable 3 to pass through. The through-fixer includes a bushing, a clamping sleeve, and an outer sleeve from the inside to the outside. The cable 3 includes a lead cable, an inner protective layer, and an outer protective layer from the inside to the outside. The lead cable passes through the inside of the bushing, the inner protective layer is located between the bushing and the clamping sleeve, and the outer protective layer is located between the clamping sleeve and the outer sleeve.

[0038] A sealing insert 6 is provided on the outer side of the suspension device 4. The sealing insert 6 matches the suspension seat 5, and the sealing insert 6 is sealed to the suspension seat 5 by a sealing element, which includes a metal seal 11 and a non-metal seal 12. Specifically, both the suspension seat 5 and the sealing insert 6 have annular grooves. One side of the sealing element is installed in the annular groove of the suspension seat 5, and the other side is installed in the annular groove of the sealing insert 6. The metal seal 11 is positioned above the non-metal seal 12 and is closer to the Christmas tree 1 than the non-metal seal 12.

[0039] The packer 9 can be normally inserted and set inside the sleeve 2. The packer 9 is a removable packer 9.

[0040] The packer connector of the straightening device 10 is cylindrical, and its outer wall penetrates into the packer 9. Both ends of the U-shaped block 14 have snap-fit ​​extensions. The outer sides of the two snap-fit ​​extensions respectively snap into the inner walls of the two opposing right-angle members 13 and are movable. The inner sides of the two snap-fit ​​extensions of the U-shaped block 14 are each provided with an elastic element mounting groove 15, and a supporting elastic element 16 is provided within the elastic element mounting groove 15. Optionally, the packer connector has an elastic element mounting groove 15. Specifically, the supporting elastic element 16 is a spring.

[0041] Example

[0042] A production well in an oilfield using a submersible electric pump is selected. It is planned to lower the electric pump into the wellbore at a certain depth for production. In this embodiment, the electric pump string includes a cable 3, a hanger 4, and an electric pump 7; the cable 3 is an armored cable.

[0043] First, the packer 9 and the centralizing device 10 are lowered into the designed setting position in the wellbore using the lowering tool. Then, the packer 9 is pressurized to complete the setting of the packer 9 and the centralizing device 10.

[0044] Next, the electric pump string is lowered. Before lowering, one end of the cable 3 is passed through the hanger 4. When passing through the hanger 4, the armored cable protective layer is stripped off, allowing only the lead cable inside the cable 3 to pass out and connect to the electric pump 7. The other end passes out of the wellhead 1.

[0045] During lowering, the oil pipe 8 at the lower end of the electric pump string passes through two U-shaped blocks 14 on the inner wall of the straightening device 10. The oil pipe 8 pushes the two U-shaped blocks 14 outward. Under the squeezing action of the U-shaped blocks 14, the supporting elastic element 16 contracts and deforms due to the force. When the hanger 4 on the electric pump string approaches the suspension seat 5, the lowering speed of the electric pump string is reduced. As the electric pump string is lowered further, the metal seal 11 in the sealing plug 6 will lock with the corresponding annular groove on the suspension seat 5 under the action of the weight of the electric pump string. As the electric pump string continues to be lowered, the non-metallic seal 12 will expand due to the squeezing action under the action of the weight of the electric pump string, further sealing the annular groove between the suspension seat 5 and the oil pipe. At the same time, the two U-shaped blocks 14, pushed by the expansion and rebound of the supporting elastic element 16, squeeze and fix the oil pipe 8 at the lower end of the electric pump string, strengthening the fixing effect of the electric pump 7, thereby reducing the fatigue breakage of the electric pump 7 due to vibration during production.

[0046] Unless otherwise specified, the equipment components involved in the above embodiments are all conventional equipment components, and the structural settings, working methods or control methods involved are all conventional settings, working methods or control methods in the art unless otherwise specified.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. An electric pump oil extraction device with a retrievable cable, characterized in that, include: The casing (2), cable (3), and hanger (4) are provided; a treehouse (1) is provided at the top of the casing (2), a hanger seat (5) is provided on the upper part of the inner wall of the casing (2), and a packer (9) is provided on the lower part of the inner wall of the casing (2); a sealing plug (6) is provided on the outside of the hanger (4), and the hanger (4) is sealed to the hanger seat (5) through the sealing plug (6); an electric pump (7) is suspended at the bottom of the hanger (4), one end of the cable (3) passes through the treehouse (1), and the other end passes through the hanger (4) and is connected to the electric pump. (7) Connection; the bottom of the electric pump (7) is connected to an oil pipe (8); the inner side of the packer (9) is connected to a straightening device (10), the straightening device (10) includes a packer connector; an elastic component is fixed to the inner wall of the opposite side of the packer connector, the elastic component includes two opposing right-angle members (13), a U-shaped block (14) is movably engaged between the two opposing right-angle members (13), the two ends of the U-shaped block (14) have engaging extensions, and a supporting elastic member (16) is provided between the engaging extensions of the right-angle members (13) and the support elastic member (16).

2. The electric pump oil extraction device with a retrievable cable as described in claim 1, characterized in that, The cable (3) is an armored cable.

3. The electric pump oil extraction device with a retrievable cable as described in claim 2, characterized in that, The cable (3) passes through one end of the hanger (4) and the armor protection layer of the cable (3) is stripped off. The lead cable inside the cable (3) passes out from the hanger (4) and is connected to the electric pump (7).

4. The electric pump oil extraction device with a retrievable cable as described in claim 1, characterized in that, The top of the hanger (4) is provided with a through-fixture.

5. The electric pump oil extraction device with a retrievable cable as described in claim 1, characterized in that, The sealing insert (6) is matched with the suspension seat (5).

6. The electric pump oil extraction device with a retrievable cable as described in claim 1, characterized in that, The sealing plug (6) is sealed to the suspension seat (5) by a sleeved sealing element. Both the suspension seat (5) and the sealing plug (6) are provided with annular grooves. One side of the sealing element is installed in the annular groove of the suspension seat (5), and the other side is installed in the annular groove of the sealing plug (6).

7. The electric pump oil extraction device with a retrievable cable as described in claim 6, characterized in that, The seal includes a metal seal (11) and a non-metal seal (12), with the metal seal (11) positioned above the non-metal seal (12).

8. The electric pump oil extraction device with a retrievable cable as described in claim 1, characterized in that, The two snap-fit ​​extensions of the U-shaped block (14) are provided with elastic element mounting grooves (15), and the supporting elastic element (16) is installed in the elastic element mounting grooves (15).

9. The electric pump oil extraction device with a retrievable cable as described in claim 1, characterized in that, The supporting elastic element (16) is a spring.

10. A method of using a cable-deployable electric pump oil extraction device according to any one of claims 1 to 9, characterized in that, Includes the following steps: The packer (9) and the centralizing device (10) are lowered into the wellbore to complete the setting of the packer (9) and the centralizing device (10); Pass one end of the cable (3) through the hanger (4) and the other end through the tree (1), and pass the cable (3) through the lead cable inside one end of the hanger (4) and connect it to the electric pump (7); The lower discharge pump (7) causes the oil pipe (8) to pass through the two U-shaped blocks (14) on the inner wall of the straightening device (10), and the oil pipe (8) is squeezed and fixed by the supporting elastic element (16); When the hanger (4) approaches the hanger seat (5), the lowering speed is reduced and the seal is locked with the hanger seat (5) and the sealing plug (6).

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