Hanging sealing anti-rotation disengagement assisting device for throwing and fishing electric pump and using method of hanging sealing anti-rotation disengagement assisting device

Abstract

The invention discloses a suspension sealing anti-rotation disengagement assisting device for a casting and fishing electric pump and a using method thereof.The suspension sealing anti-rotation disengagement assisting device comprises a casting and fishing sealing barrel and an anti-rotation disengagement assisting positioning seal, the anti-rotation disengagement assisting positioning seal is arranged on the inner side of the casting and fishing sealing barrel, and the anti-rotation disengagement assisting positioning seal comprises a sealing body, a disengagement assisting connector and an unclamping inner barrel which are connected from bottom to top; the upper end of the inner unfreezing barrel extends into the outer unfreezing barrel, a split slip cage is arranged outside the sealing body, an anti-rotation slip is arranged in the split slip cage, and the sealing body rotates to extrude the anti-rotation slip so that the anti-rotation slip anchors the throwing and fishing sealing barrel; an outer cylinder plug is arranged at the lower end of the jam releasing outer cylinder and located between the jam releasing inner cylinder and the jam releasing outer cylinder, and a disengagement assisting piston is arranged at the upper end of the jam releasing inner cylinder. According to the electric pump, electric pump disengagement assisting is achieved through the releasing inner cylinder and the disengagement assisting connector, and the anti-rotation problem is solved through the anti-rotation slip and the cam structure of the sealing body. The device can quickly and effectively complete dropping and fishing of the electric pump, and normal production and operation safety of an oil well are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of submersible electric pump deployment and retrieval technology, and in particular to a suspension seal anti-rotation and detachment aid device for deploying electric pumps and its usage method. Background Technology

[0002] With the development of the oil extraction industry, the extraction environment of oil wells is becoming increasingly complex. In the extraction of some multi-layered oil reservoirs, it is necessary to extract, test, and manage different oil layers in layers. Submersible electric pumps (SAPs) are widely used in oil extraction to lift fluids from downhole to the surface. SSP deployment and retrieval technology has emerged to address this need. It enables the accurate deployment of SSPs to the target formation or their retrieval from downhole using deployment tools, achieving precise control over the oil layer. SSP deployment and retrieval technology is indispensable in the installation, maintenance, and use of downhole tools. When an SSP malfunctions and requires repair or replacement of downhole components, deployment and retrieval technology is used to retrieve the pump or related components from the well. When an SSP is deployed to the target formation, its positioning, sealing, and anti-rotation device is particularly important.

[0003] The existing submersible electric pump suspension system has the following problems: 1. Do not pass through the submersible pump cable.

[0004] 2. The anti-transfer structure is complex, the deployment process is cumbersome, and the anti-transfer effect is poor; 3. Sometimes the sealing structure is tightly integrated with the downhole sealing cylinder, and the lifting force during retrieval exceeds the pulling force of the retrieval tool, making retrieval difficult.

[0005] Therefore, an electric pump-based retrieval device is needed that can both position and seal the device, and prevent rotation and aid in detachment. Summary of the Invention

[0006] In order to solve all or some of the above problems, the present invention aims to provide a suspension sealing anti-rotation and detachment aid device for a fishing electric pump and its usage method.

[0007] The present invention solves its problems through the following technical solution: A suspension seal anti-rotation and detachment aid device for a fishing electric pump includes a fishing sealing cylinder and an anti-rotation and detachment aid positioning seal. The anti-rotation and detachment aid positioning seal is located inside the fishing sealing cylinder. The anti-rotation and detachment aid positioning seal includes a sealing body, a detachment aid connector, a release inner cylinder, and a release outer cylinder. The sealing body is provided with a split slip cage, and the split slip cage is provided with an anti-rotation slip. The rotation of the sealing body can compress the anti-rotation slip, causing the anti-rotation slip to anchor the fishing sealing cylinder. A power cable passes through the sealing body, and the lower end of the power cable is connected to the electric pump. The upper end of the inner tube extends into the outer tube of the card release mechanism. The upper end of the inner tube is equipped with a release piston. The lower end of the inner tube is connected to the release connector, and the lower end of the release connector is connected to the sealing body. The lower end of the outer tube is equipped with an outer tube plug, which is located between the inner and outer tubes. The inner cavity of the outer tube below the release piston is connected to a hydraulic control line. Pressure is applied to the lower cavity of the outer tube through the hydraulic control line, causing the release piston to move upward. Under the weight of the electric pump and the lifting pressure, the release piston moves downward.

[0008] Optionally, the outer wall of the sealing body is provided with a cam, and the anti-rotation slip is provided with a clamping part in the direction of clockwise rotation of the sealing body. When the sealing body rotates to the point where the cam squeezes the clamping part, the anti-rotation slip moves radially outward to anchor the retrieval sealing cylinder.

[0009] Optionally, the sealing body is provided with a retaining ring and a fixing ring at the upper and lower ends of the split slip cage, respectively. The retaining ring and the fixing ring are used to axially position the split slip cage, and the retaining ring and the fixing ring are also used to limit the radial outward movement distance of the anti-rotation slip.

[0010] Optionally, a rectangular spring is provided between the sealing body and the anti-rotation slip. One end of the rectangular spring is connected to the sealing body, and the anti-rotation slip is provided with a groove corresponding to the rectangular spring. The other end of the rectangular spring is located in the groove, and the rectangular spring can move with the sealing body in the groove.

[0011] Optionally, the retrieval sealing cylinder includes a sealing cylinder, an upper connector, a sleeve short section, a special coupling, and an outer sleeve arranged from bottom to top. The lower end of the sealing body is provided with a lower retaining ring, and a gasket and a composite sealing element are arranged in sequence above the lower retaining ring. The composite sealing element is used to seal the sealing cylinder and the sealing body. The inner wall of the special coupling is provided with a step, and the lower end of the release outer cylinder sits on the step.

[0012] Optionally, the composite seal includes a non-metallic sealing ring and a spring, with the spring wrapped around the top of the non-metallic sealing ring.

[0013] Optionally, a pipeline crossing section and a lifting section are sequentially provided above the outer cylinder for unblocking.

[0014] A method of using the aforementioned suspension seal anti-rotation and detachment aid device for a retrieval electric pump includes the following steps: Outer layer retrieval sealing cylinder installation: The outer sleeve is threaded to the special coupling; the special coupling is threaded to the sleeve short section; the sleeve short section is threaded to the upper connector; the upper connector is threaded to the sealing cylinder. Inner anti-rotation and detachment positioning seal installation: The lifting short section is threadedly connected to the outer cylinder of the detachment mechanism, and the inner cylinder of the detachment mechanism is threadedly connected to the detachment piston. The detachment piston is placed in the cavity of the outer cylinder of the detachment mechanism. An outer cylinder plug is installed at the end of the outer cylinder of the detachment mechanism to restrict the detachment piston from coming out. The detachment connector and the sealing body are connected downwards in sequence to the inner cylinder of the detachment mechanism. The sealing body is externally installed with a retaining ring, a split slip cage, a rectangular spring, an anti-rotation slip, a fixing ring, a composite seal, a gasket, and a lower retaining ring. During the gravity-driven descent, the electric pump moves the sealing body, the release connector, the release inner cylinder, and the release piston downwards; pressure is applied to the lower cavity of the release outer cylinder through the hydraulic control line, pushing the release piston, the sealing body, the release connector, and the release inner cylinder upwards.

[0015] In summary, the technical effects and advantages of this invention are as follows: The piston of this invention can move up and down relative to the outer cylinder of the release mechanism. Under the weight of the electric pump itself and the lifting pressure, it moves downward, pressing down on the sealing body through the inner cylinder of the release mechanism and the release connector; under the pressure of the hydraulic control line, it moves upward, lifting the sealing body through the inner cylinder of the release mechanism and the release connector, thus achieving electric pump-assisted release; the anti-rotation slip solves the problem of electric pump anti-rotation by cooperating with the cam structure of the sealing body; the composite seal is composed of a non-metallic sealing ring wrapped with a spring, and the spring has good elasticity, so that the non-metallic sealing surface is tightly attached to the sealing cylinder, thus achieving electric pump sealing; the device has a simple structure, is easy to operate, has a good sealing and anti-rotation effect, and is stable and reliable. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a suspension sealing anti-rotation and detachment aid device for a retrieval electric pump in one embodiment of the present invention; Figure 2 This is a schematic diagram of the composite seal and gasket in one embodiment of the present invention; Figure 3 This is a schematic diagram of the sealing body and anti-rotation slip in one embodiment of the present invention; Figure 4 This is a schematic diagram of the anti-rotation and detachment positioning seal in one embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the retrieval sealing cylinder in one embodiment of the present invention.

[0018] The components include: 1. Special coupling; 2. Upper connector; 3. Sealing cylinder; 4. Sleeve short section; 5. Lifting short section; 6. Pipeline crossing short section; 7. Unlocking outer cylinder; 8. Outer cylinder plug; 9. Release piston; 10. Unlocking inner cylinder; 11. Release connector; 12. Sealing body; 13. Snap ring; 14. Anti-rotation slip; 15. Split slip cage; 16. Lower retaining ring; 17. Cable cover; 18. Fixing ring; 19. Composite seal; 20. Washer ring; 28. Outer sleeve; 29. ​​Rectangular spring; 30. Spring; 31. Hydraulic control line; 32. Cam; 33. Clamping part. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention overcomes the shortcomings of existing technologies, providing a simple, easy-to-operate, effective, and cost-efficient suspended sealing anti-rotation and detachment aid device. By using the unblocking inner cylinder and the detachment aid connector, the electric pump is detached; the anti-rotation problem is solved through the cam structure of the anti-rotation slips and the sealing body; and the composite seal optimizes the sealing function of the electric pump. This device can quickly and effectively complete the deployment and retrieval of the electric pump, ensuring normal production and operational safety of the oil well.

[0021] This embodiment provides a suspended sealing anti-rotation and detachment aid device for a retrieval electric pump and its usage method, such as... Figures 1-5As shown, the device includes a retrieval sealing cylinder and an anti-rotation auxiliary positioning seal. The anti-rotation auxiliary positioning seal is located inside the retrieval sealing cylinder and includes a sealing body 12, an auxiliary connector 11, an inner release cylinder 10, and an outer release cylinder 7. A split slip cage 15 is provided outside the sealing body 12, and an anti-rotation slip 14 is provided inside the split slip cage 15. Rotation of the sealing body 12 can compress the anti-rotation slip 14, causing it to anchor the retrieval sealing cylinder. A power cable passes through the sealing body 12, with its lower end connected to an electric pump. The upper end of the inner release cylinder 10 extends into the release cylinder. Inside the outer cylinder 7, the upper end of the inner cylinder 10 is provided with a release piston 9, the lower end of the inner cylinder 10 is connected to the release connector 11, the lower end of the release connector 11 is connected to the sealing body 12, the lower end of the outer cylinder 7 is provided with an outer cylinder plug 8, the outer cylinder plug 8 is located between the inner cylinder 10 and the outer cylinder 7, the inner cavity of the outer cylinder 7 below the release piston 9 is connected to the hydraulic control line 31, and pressure is applied to the lower cavity of the outer cylinder 7 through the hydraulic control line 31, causing the release piston 9 to move upward, and under the weight of the electric pump and the lifting pressure, the release piston 9 moves downward.

[0022] In this embodiment, the outer cylinder plug 8 is fixedly connected to the outer release cylinder 7, and the inner release cylinder 10 is placed inside the cavity of the outer cylinder plug 8 and the outer release cylinder 7. The inner release cylinder 10 can move up and down (not fixedly connected). The upper end of the inner release cylinder 10 is fixedly connected to a piston, and the piston diameter is larger than the inner diameter of the outer cylinder plug 8. This structure can limit the release cylinder 10 from the outer release cylinder 7. The release piston 9 is fixedly connected to the inner release cylinder 10, and the inner release cylinder 10 is fixedly connected to the release connector 11. The release connector 11 is fixedly connected to the sealing body 12. The up and down movement of the release piston 9 will drive the sealing body 12 to move up and down.

[0023] Furthermore, the outer wall of the sealing body 12 is provided with a cam 32, and the anti-rotation slip 14 is provided with a clamping part 33 in the direction of clockwise rotation of the sealing body 12. When the sealing body 12 rotates to the point where the cam 32 presses the clamping part 33, the anti-rotation slip 14 moves radially outward to anchor the retrieval sealing cylinder.

[0024] Furthermore, the sealing body 12 is provided with a retaining ring 13 and a fixing ring 18 at the upper and lower ends of the split slip cage 15, respectively. The retaining ring 13 and the fixing ring 18 are used for axial positioning of the split slip cage 15, and the retaining ring 13 and the fixing ring 18 are also used to limit the radial outward movement distance of the anti-rotation slip 14.

[0025] Specifically, a rectangular spring 29 is provided between the sealing body 12 and the anti-rotation slip 14. One end of the rectangular spring 29 is connected to the sealing body 12, and the anti-rotation slip 14 has a groove corresponding to the rectangular spring 29. The other end of the rectangular spring 29 is located in the groove, and the rectangular spring 29 can move with the sealing body 12 within the groove. The rectangular spring 29 is used to support the anti-rotation slip 14.

[0026] In this embodiment, the release connector 11 is fixedly connected to the sealing body 12. A retaining ring 13, a split slip cage 15, and a fixing ring 18 are installed between the lower end of the release connector 11 and the shoulder protrusion of the sealing body 12. The anti-rotation slip 14 is supported by a rectangular spring 29. When rotating, the anti-rotation slip 14 is embedded in the internal groove of the upper connector 2, restricting its rotation. The anti-rotation slip 14 is placed in each notch of the split slip cage 15, which also restricts the rotation of the split slip cage 15. The anti-rotation slip 14 is provided in each notch of the split slip cage 15. The retaining ring 13 and the fixing ring 18 are located at both ends of the split slip cage 15. The fixing ring 18 is located at the upper end of the shoulder protrusion of the sealing body 12 to restrict the split slip cage 15 from moving downward. The retaining ring 13 is located at the lower end of the release connector 11, which is fixedly connected to the sealing body 12, and the release connector 11 restricts the split slip cage 15 from moving upward.

[0027] Specifically, the retrieval sealing cylinder includes, from bottom to top, a sealing cylinder 3, an upper connector 2, a sleeve short section 4, a special coupling 1, and an outer sleeve 28. The lower end of the sealing body 12 is provided with a lower retaining ring 16. Above the lower retaining ring 16, a gasket and a composite sealing element 19 are arranged in sequence. The composite sealing element 19 is used to seal the sealing cylinder 3 and the sealing body 12. In this embodiment, the lower retaining ring 16 is fixed to the sealing body 12, preventing the composite sealing element 19 on the sealing body 12 from detaching. The gasket is installed between the composite sealing element 19 and the lower retaining ring 16, serving to press the composite sealing element 19 tightly. The inner wall of the special coupling 1 has a step, and the lower end of the release outer cylinder 7 rests on the step. The release outer cylinder 7 is located inside the outer sleeve 28 and is limited by the step of the special coupling 1.

[0028] Furthermore, the composite seal 19 includes a non-metallic sealing ring and a spring 30, with the spring 30 wrapped around the top of the non-metallic sealing ring.

[0029] Optionally, a pipeline crossing section 6 and a lifting section 5 are sequentially provided above the outer cylinder 7 for unblocking.

[0030] This embodiment also provides a method of using the aforementioned suspension sealing anti-rotation and detachment aid device for a retrieval electric pump, including the following steps: Installation of the outer layer of the retrieval sealing cylinder: The outer sleeve 28 is threaded to the special coupling 1; the special coupling 1 is threaded to the sleeve short section 4; the sleeve short section 4 is threaded to the upper connector 2; the upper connector 2 is threaded to the sealing cylinder 3. Inner anti-rotation and detachment positioning seal installation: The lifting section 5 is threadedly connected to the outer cylinder 7 of the detachment, and the inner cylinder 10 of the detachment is threadedly connected to the detachment piston 9. The detachment piston 9 is placed in the cavity of the outer cylinder 7 of the detachment. An outer cylinder plug 8 is installed at the end of the outer cylinder 7 to restrict the detachment piston 9 from detaching. The inner cylinder 10 of the detachment is connected downward to the detachment connector 11 and the sealing body 12 in sequence. The sealing body 12 is externally installed with a retaining ring 13, a split slip cage 15, a rectangular spring 29, an anti-rotation slip 14, a fixing ring 18, a composite seal 19, a gasket, and a lower retaining ring 16. During the gravity-driven descent, the electric pump moves the sealing body 12, the release connector 11, the release inner cylinder 10, and the release piston 9 downwards; and pressurizes the lower cavity of the release outer cylinder 7 through the hydraulic control line 31, pushing the release piston 9, the sealing body 12, the release connector 11, and the release inner cylinder 10 upwards.

[0031] The upper end of the lifting section 5 is connected to the wire work release tool, and cables and hydraulic lines can pass through its interior.

[0032] The outer cylinder 7 for releasing the kink has a pipeline penetration sealing hole. The hydraulic control pipeline is connected to the pipeline penetration sealing hole through a 1 / 4 NPT connector, which can guide the pressure of the external hydraulic control pipeline into the interior of the outer cylinder. The interior is a sealing surface that cooperates with the release piston 9 to push the release piston 9 upward. The outer cylinder 7 is positioned with the stepped surface inside the special coupling 1. The outer cylinder 7 is threadedly connected to the outer sleeve 28. The release piston 9 can move up and down relative to each other inside the outer cylinder 7. Under the weight of the electric pump itself and the lifting pressure, it moves downward, pressing down the sealing body through the inner cylinder 10 and the release connector 11. Under the pressure of the hydraulic control pipeline, the release piston 9 moves upward, lifting the sealing body through the inner cylinder and the release connector, thus realizing electric pump-assisted release.

[0033] The anti-rotation slip 14 solves the problem of electric pump anti-rotation by cooperating with the cam structure of the sealing body 12. When the electric pump is working, the self-transmission torque generated causes the sealing body 12 to rotate. At this time, the cam of the sealing body 12 will squeeze the clamping part of the anti-rotation slip 14, anchor the upper connector 2, fix the electric pump to the tubing, and realize the anti-rotation of the electric pump.

[0034] The anti-rotation slip 14 is supported by a rectangular spring. When it encounters resistance during the lifting and lowering process, the external force compresses the rectangular spring, which can be retracted to the sealing body 12, so that the outer diameter of the anti-rotation slip 14 is smaller than the overall outer diameter of the device, which facilitates the downward movement of the tubing.

[0035] After the composite seal 19 is applied, the produced liquid is divided into upper and lower layers at the sealing cylinder, which are separated by the composite seal 19. The composite seal 19 consists of a non-metallic sealing ring enclosing a spring. In this embodiment, the spring is a metal spring, which has good elasticity. The elastic force of the metal spring causes the non-metallic sealing ring to expand outward and compress the sealing cylinder, thus achieving a seal. The cable cover 17 serves to limit and protect the electric pump cable.

[0036] In summary, the detachment piston of this application can move up and down relative to each other inside the outer release cylinder. Under the weight of the electric pump itself and the lifting pressure, it moves downward, pressing down the sealing body through the inner release cylinder and the detachment connector; under the pressure of the hydraulic control line, it moves upward, lifting the sealing body through the inner release cylinder and the detachment connector, thus achieving electric pump-assisted detachment; the anti-rotation slip solves the problem of electric pump anti-rotation by cooperating with the cam structure of the sealing body; the composite seal consists of a non-metallic sealing ring wrapped with a spring, and the spring has good elasticity, so that the non-metallic sealing surface is tightly attached to the sealing cylinder, thus achieving electric pump sealing; the device has a simple structure, is easy to operate, has a good sealing and anti-rotation effect, and is stable and reliable.

[0037] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0038] Furthermore, the terms "a," "two," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A hanging seal anti-rotation and assisting releasing device for fishing electric pump, characterized in that, The application relates to a fishing sealing cylinder and an anti-rotation and assisting-drawing positioning seal, wherein the anti-rotation and assisting-drawing positioning seal is arranged inside the fishing sealing cylinder and comprises a sealing body, an assisting-drawing joint, an unblocking inner cylinder and an unblocking outer cylinder; a split slip cage is arranged outside the sealing body; an anti-rotation slip is arranged inside the split slip cage; the sealing body can rotate to extrude the anti-rotation slip and anchor the fishing sealing cylinder; a power cable is arranged inside the sealing body and connected with an electric pump at the lower end; the upper end of the unblocking inner cylinder is arranged in the unblocking outer cylinder; the upper end of the unblocking inner cylinder is provided with an assisting-drawing piston; the lower end of the unblocking inner cylinder is connected with the assisting-drawing joint; the lower end of the assisting-drawing joint is connected with the sealing body; the lower end of the unblocking outer cylinder is provided with an outer cylinder plug; the outer cylinder plug is arranged between the unblocking inner cylinder and the unblocking outer cylinder; the inner cavity of the unblocking outer cylinder below the assisting-drawing piston is communicated with a hydraulic control pipeline; the lower cavity of the unblocking outer cylinder is pressed by the hydraulic control pipeline; the assisting-drawing piston moves upwards and then moves downwards under the weight and lifting pressure of the electric pump.

2. The hanging seal anti-rotation assisted release device for fishing electric pump according to claim 1, characterized in that, A cam is arranged on the outer wall of the sealing body; the anti-rotation slip is provided with a clamping part in the clockwise rotating direction of the sealing body; when the sealing body rotates to the position where the cam extrudes the clamping part, the anti-rotation slip moves radially outward to anchor the fishing sealing cylinder.

3. The hanging seal anti-rotation assisted release device for fishing an electric pump according to claim 2, characterized in that, The sealing body is provided with a clamping ring and a fixing ring corresponding to the upper end and the lower end of the split slip cage; the clamping ring and the fixing ring are used for axially positioning the split slip cage and limiting the radial outward moving distance of the anti-rotation slip.

4. The hanging seal anti-rotation assisted release device for fishing an electric pump according to claim 3, characterized in that, A rectangular spring is arranged between the sealing body and the anti-rotation slip; one end of the rectangular spring is connected with the sealing body; the anti-rotation slip is provided with a clamping groove corresponding to the rectangular spring; the other end of the rectangular spring is arranged in the clamping groove; the rectangular spring can move in the clamping groove along with the sealing body.

5. The hanging seal anti-rotation assisted release device for fishing electric pump of claim 1, wherein, The fishing sealing cylinder comprises a sealing cylinder, an upper joint, a casing short section, a special coupling and an outer casing arranged from bottom to top; the lower end of the sealing body is provided with a lower blocking ring; a gasket cup and a composite sealing element are sequentially arranged above the lower blocking ring; the composite sealing element is used for sealing the sealing cylinder and the sealing body; the inner wall of the special coupling is provided with a step; the lower end of the unblocking outer cylinder is arranged on the step.

6. The hanging seal anti-rotation assisted release device for fishing an electric pump according to claim 5, characterized in that, The composite sealing element comprises a non-metallic sealing ring and a spring; the upper part of the non-metallic sealing ring is wrapped with the spring.

7. The hanging seal anti-rotation assisted release device for fishing an electric pump according to claim 1, characterized in that, A pipeline crossing short section and a lifting short section are sequentially arranged above the unblocking outer cylinder.

8. A method of using the hanging seal anti-rotation assisted release device for fishing an electric pump according to any one of claims 1-7, characterized in that, The application further discloses a fishing sealing method comprising the following steps: outer layer fishing sealing cylinder installation: the outer casing is threadedly connected with the special coupling; the special coupling is threadedly connected with the casing short section; the casing short section is threadedly connected with the upper joint; the upper joint is threadedly connected with the sealing cylinder; inner layer anti-rotation and assisting-drawing positioning seal installation: the lifting short section is threadedly connected with the unblocking outer cylinder; the unblocking inner cylinder is threadedly connected with the assisting-drawing piston; the assisting-drawing piston is arranged in the cavity of the unblocking outer cylinder; the outer cylinder plug is arranged at the end of the unblocking outer cylinder to limit the assisting-drawing piston from being drawn out; the unblocking inner cylinder is sequentially connected with the assisting-drawing joint and the sealing body from bottom to top; the sealing body is externally provided with the clamping ring, the split slip cage, the rectangular spring, the anti-rotation slip, the fixing ring, the composite sealing element, the gasket cup and the lower blocking ring; The electric pump drives the sealing body, the release joint, the releasing inner cylinder and the release piston to move downward during the gravity lowering process; and the electric pump pushes the release piston, the sealing body, the release joint and the releasing inner cylinder to move upward by pressing the lower cavity of the releasing outer cylinder through the hydraulic control pipeline.

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