A new type of deepwater spring energy type tubing hanger recovery tool

Abstract

The application relates to the field of underwater Christmas tree oil pipe hangers, and discloses a deepwater novel spring energy storage type oil pipe hanger recovery tool, which comprises a THMRT mandrel, an internal inclined table, a locking ring and a groove. An upper spring shell body is fixedly arranged in the THMRT mandrel. An upper spring body is fixedly arranged on the lower surface of the upper spring shell body. A THMRT shell body is mounted on the outer wall of the THMRT mandrel. A lower spring is fixedly arranged in the THMRT shell body. A pressing plate is mounted in the THMRT shell body. A bearing body is fixedly arranged below the pressing plate. A screw is mounted in the THMRT shell body. A lower supporting ring is fixedly arranged at the bottom of the THMRT shell body. Through the cooperation between the components, compared with other recovery tools, the device is more integrated, the operation is simpler, and the function is more stable.

Description

Technical Field

[0001] This invention relates to the field of underwater production tree tubing hangers, specifically a new type of deep-water spring-energy-storage tubing hanger recovery tool. Background Technology

[0002] The new tubing hanger retrieval tool is an important piece of equipment for retrieving tubing hangers from the wellhead. The new tubing hanger retrieval tool faces complex working conditions underwater, as well as harsh environmental conditions, such as waves, ocean currents, drilling ship drift, and circulating internal pressure.

[0003] Currently, the most widely used recovery tool is the hydraulic recovery tool. The hydraulic recovery tool uses claws to fasten the oil pipe hangers that need to be recovered, and uses hydraulic power to drive the oil pipe hangers up. However, the recovery operation is complicated, and if the hydraulic pipeline fails, it is difficult to deal with it in time, resulting in poor recovery stability. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a novel deep-water spring-energy-storage type tubing suspension recovery tool, which solves the problems of complex recovery operations, difficulty in timely handling of hydraulic pipeline malfunctions, and poor recovery stability.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a novel deep-water spring-energy-storing tubing hanger recovery tool, comprising a THMRT mandrel, an internal inclined platform, a locking ring, and a groove. An upper spring housing is fixedly disposed inside the THMRT mandrel, and an upper spring body is fixedly disposed on the lower surface of the upper spring housing. A THMRT housing is mounted on the outer wall of the THMRT mandrel, and a lower spring is fixedly disposed inside the THMRT housing. A pressure plate is installed inside the THMRT housing, and a bearing body is fixedly disposed below the pressure plate. The THMRT housing has screws installed inside. A lower support ring is fixedly installed at the bottom of the THMRT housing. A LOCK caliper is installed at the bottom of the THMRT housing. A LATCH caliper is installed on the outer wall of the LOCK caliper. A sealing sleeve is fixedly installed on the outer wall of the LATCH caliper. A threaded ring is fixedly installed inside the THMRT housing. An ACME rotating sleeve is fixedly installed inside the THMRT housing near the threaded ring. An excitation ring is installed on the side of the THMRT housing near the ACME rotating sleeve. A guide key is fixedly installed directly above the excitation ring.

[0006] Preferably, the THMRT mandrel, upper spring housing, THMRT housing, bearing body, sealing sleeve, and ACME rotating sleeve are all cylindrical structures. The THMRT mandrel is narrow at the top, wide in the middle, and narrow at the bottom, with a threaded hole in the lower middle part. The upper spring housing and THMRT housing are used to load the spring. The bottom of the sealing sleeve has a large rounded corner for easy docking with the oil pipe.

[0007] Preferably, the lower support ring, LOCK caliper, LATCH caliper, threaded ring, and excitation ring are all annular structures, and the LOCK caliper and LATCH caliper are the main recovery components.

[0008] Preferably, the LOCK caliper and LATCH caliper are in a closed state in the initial state, and the THMRT housing is provided with a special hexagonal screw to ensure that the guide key is installed on the THMRT spindle and to provide counter torque when the THMRT spindle rotates.

[0009] Preferably, a shearing pin is provided between the threaded rings at the lower part of the bearing body, and the shearing pin causes the LOCK caliper and LATCH caliper to operate according to the required pressure.

[0010] Preferably, the upper spring body is fixedly disposed inside the THMRT mandrel, the lower surface of the upper spring housing is fixedly disposed on the upper surface of the THMRT housing, the bearing body is fixedly disposed inside the THMRT housing, the sealing sleeve is installed on the outer wall of the THMRT mandrel, and the guide key is fixedly disposed inside the THMRT housing.

[0011] Preferably, the outer wall of the THMRT housing is provided with a mounting block, and a plurality of guide posts are slidably connected inside the mounting block. A housing is fixedly connected to the outer wall of the guide posts, and a pressurization assembly is installed inside the housing. The pressurization assembly includes an airbag, and the airbag is connected to the inside of the THMRT housing through an external air duct.

[0012] Preferably, the pressurization assembly further includes a sliding plate, the outer wall of which is slidably connected to the inside of the housing, a fixing rod is slidably connected to the inside of the sliding plate, the outer wall of which is fixedly connected to the inside of the housing, and the lower surface of the sliding plate is attached to the outer wall of the airbag.

[0013] Preferably, a fixing post is fixedly connected to the outer wall of the housing, and a pin assembly is installed inside the fixing post. The pin assembly includes multiple pin bodies, and an arc-shaped plate is slidably connected to the outer wall of the pin body. The lower surface of the arc-shaped plate is fixedly connected to the upper surface of the mounting block.

[0014] Preferably, the pin assembly further includes a collar, the outer wall of which is slidably connected to the inside of the fixing post, the lower surface of which is fixedly connected to the outer wall of the pin body, and an elastic element is fixedly provided on the outer wall of the pin body.

[0015] Working Principle: After the new tubing hanger retrieval tool is hoisted, it is slowly lowered until the bottom of the THMRT housing contacts the top surface of the tubing hanger's seat ring. It is then lowered further until the lower support ring rests on the shoulder of the tubing hanger's fixing nut and is in contact with the top of the tubing hanger body. The THMRT housing is then rotated clockwise until its bottom protrusion aligns with the groove of the tubing hanger's seat sleeve. The upper spring maintains the tool's relative fixation to the tubing hanger. The THMRT mandrel is then rotated clockwise, causing the ACME rotating sleeve to rotate synchronously via the guide key. Because the excitation ring and the ACME rotating sleeve are threaded together, the excitation ring moves downwards, cutting off the upper shear pin. The moving excitation ring then compresses the lock. The caliper and LATCH caliper are used to open them outwards and lock them onto the tubing hanger sealing ring and the internal ramp, respectively, to lock the tool to the tubing hanger. Then, the tool is lifted, at which point the lower shear pin is cut off. The THMRT spindle drives the THMRT housing and the locked LOCK caliper upwards until the LOCK caliper is pressed against the internal ramp of the tubing hanger sealing ring. The tool is then lifted until the shoulder of the carrier body connects with the shoulder of the drive sleeve, and the LOCK caliper engages with the tubing hanger drive sleeve. After completing a 2.06-inch unlocking stroke, the tool is continuously lifted. At this point, the LOCK caliper pulls the tubing hanger sealing sleeve out of the locking ring, further disengaging the locking ring from the groove of the Christmas tree and causing it to retract inwards, thereby achieving the unlocking and retrieval effect between the tubing hanger and the Christmas tree.

[0016] This invention provides a novel deep-water spring-energy-storage type tubing suspension recovery tool. It has the following beneficial effects: 1. Through the cooperation between the various components, this invention achieves a higher level of integration, simpler operation, and more stable function compared to other recycling tools.

[0017] 2. In this invention, the LOCK and LATCH calipers are initially closed. After the tool is placed in the designated position of the tubing hanger, the threaded rotation causes the excitation ring to move, which opens the LOCK and LATCH calipers and locks them in the set ring and the internal ramp of the tubing hanger, thereby achieving a quick locking effect.

[0018] 3. The present invention, through the design of the excitation ring, causes the LOCK caliper and LATCH caliper to move simultaneously and reach their designated positions when the excitation ring is activated, thereby achieving a faster operation.

[0019] 4. This invention utilizes the water's own pressure to drive the sliding plate to slide downwards inside the housing, further compressing the internal airbags. The gas generated by compressing the airbags is then transported to the THMRT housing through an external air duct, thereby pressurizing the gas inside the THMRT housing and improving the robustness of its internal connections. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a partial structural diagram of the shear pin of the present invention; Figure 4 This is a partial structural diagram of the locking ring of the present invention; Figure 5 This is a partial structural diagram of the hexagonal special screw of the present invention; Figure 6 This is a partial structural diagram of the THMRT mandrel of the present invention; Figure 7 This is a partial structural diagram of the guide post of the present invention; Figure 8 This is a schematic diagram of a partial structure of the collar of the present invention.

[0021] The components are as follows: 1. THMRT spindle; 2. Upper spring housing; 3. Upper spring body; 4. THMRT housing; 5. Lower spring; 6. Pressure plate; 7. Bearing body; 8. Screw; 9. Lower support ring; 10. LOCK caliper; 11. LATCH caliper; 12. Sealing sleeve; 13. Threaded ring; 14. ACME rotating sleeve; 15. Excitation ring; 16. Guide key; 17. Mounting block; 18. Guide post; 19. Housing; 20. Pressurization assembly; 201. Sliding plate; 202. Fixing rod; 203. Airbag; 21. Fixing post; 22. Pin assembly; 221. Pin body; 222. Elastic element; 223. Collar; 23. Arc plate; 24. Hexagonal special screw; 25. Shear pin; 26. Internal inclined platform; 27. Locking ring; 28. Groove. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described 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.

[0023] Please see the appendix Figure 1 -Appendix Figure 5This invention provides a novel deep-water spring-storage tubing hanger recovery tool, comprising a THMRT mandrel 1, an internal inclined platform 26, a locking ring 27, and a groove 28. An upper spring housing 2 is fixedly mounted inside the THMRT mandrel 1, and an upper spring body 3 is fixedly mounted on the lower surface of the upper spring housing 2. A THMRT housing 4 is mounted on the outer wall of the THMRT mandrel 1, and a lower spring 5 is fixedly mounted inside the THMRT housing 4. A pressure plate 6 is installed inside the THMRT housing 4, and a bearing body 7 is fixedly mounted below the pressure plate 6. Screws 8 are installed inside the THMRT housing 4, and a screw is fixedly mounted at the bottom of the THMRT housing 4. The lower support ring 9 and the bottom of the THMRT housing 4 are equipped with a LOCK caliper 10. A LATCH caliper 11 is provided on the outer wall of the LOCK caliper 10. A sealing sleeve 12 is fixedly provided on the outer wall of the LATCH caliper 11. A threaded ring 13 is fixedly provided inside the THMRT housing 4. An ACME rotating sleeve 14 is fixedly provided inside the THMRT housing 4 near the threaded ring 13. An excitation ring 15 is installed on the side of the THMRT housing 4 near the ACME rotating sleeve 14. A guide key 16 is fixedly provided directly above the excitation ring 15. The components include: THMRT spindle 1, upper spring housing 2, THMRT housing 4, and bearing body. 7. Both the sealing sleeve 12 and the ACME rotating sleeve 14 are cylindrical structures. The THMRT spindle 1 is narrow at the top, wide in the middle, and narrow at the bottom, with a threaded hole in the lower middle part. The upper spring housing 2 and the THMRT housing 4 are used to load the spring. The bottom of the sealing sleeve 12 has a large rounded corner for easy docking with the oil pipe. The lower support ring 9, LOCK caliper 10, LATCH caliper 11, threaded ring 13, and excitation ring 15 are all annular structures, with LOCK caliper 10 and LATCH caliper 11 being the main recovery parts. LOCK caliper 10 and LATCH caliper 11 are in a closed state in the initial state. The THMRT housing 4 has 24 hexagonal special screws inside. The guide key 16 is installed on the THMRT spindle 1 and provides counter-torque when the THMRT spindle 1 rotates; a shear pin 25 is provided between the threaded rings 13 at the lower part of the bearing body 7, and the shear pin 25 causes the LOCK caliper 10 and LATCH caliper 11 to operate according to the required pressure; the upper spring body 3 is fixedly installed inside the THMRT spindle 1, the lower surface of the upper spring housing 2 is fixedly installed on the upper surface of the THMRT housing 4, the bearing body 7 is fixedly installed inside the THMRT housing 4, the sealing sleeve 12 is installed on the outer wall of the THMRT spindle 1, and the guide key 16 is fixedly installed inside the THMRT housing 4.

[0024] Specifically, the bottom of the recovery tool has a large chamfered conical surface, which provides rough alignment when connected to the tubing hanger. After the bottom of the THMRT housing 4 contacts the top surface of the tubing hanger seat ring, it continues to be lowered until the bottom of the lower support ring 9 is in contact with the top of the tubing hanger body. Then, the THMRT housing 4 is rotated clockwise so that the bottom protrusion of the THMRT housing 4 successfully engages with the groove 28 on the top surface of the tubing hanger seat ring. Then, the THMRT mandrel 1 is rotated clockwise, which drives the ACME rotating sleeve 14 to rotate synchronously through the guide key 16. Since the excitation ring 15 is threadedly connected to the ACME rotating sleeve 14, it drives the excitation ring 15 to move downward. During this process, the upper shear pin 25 is sheared. After moving a certain distance, the excitation ring 15 will squeeze the LOCK caliper 10 and LATCH caliper 11, causing them to open outwards and lock into the tubing. The tool is locked to the tubing hanger on the tubing seat ring and the internal ramp 26. Then, the tool is lifted upwards, and the lower shear pin 25 is cut. At this time, the THMRT spindle 1 drives the THMRT housing 4 and the locked LOCK caliper 10 to move upwards until the LOCK caliper 10 is pressed against the internal ramp 26 of the tubing hanger seat ring. When the tool continues to move upwards by 2.06 inches, the LOCK caliper 10 lifts the tubing hanger seat ring upwards, further disengaging the locking ring 27 from the groove 28 of the Christmas tree and retracting it inwards. Finally, the tubing hanger is unlocked and retrieved from the Christmas tree. The high integration of the ACME rotary sleeve 14 eliminates the need for additional drive components and moving mechanisms, simplifying the overall structure while ensuring the flexibility of the excitation ring 15 drive and the ease of its own movement, thereby improving the ease of tool operation.

[0025] Please see the appendix Figure 6 -Appendix Figure 8The outer wall of the THMRT housing 4 is provided with a mounting block 17. Multiple guide posts 18 are slidably connected inside the mounting block 17. A housing 19 is fixedly connected to the outer wall of the guide posts 18. A pressurization assembly 20 is installed inside the housing 19. The pressurization assembly 20 includes an airbag 203, which is connected to the inside of the THMRT housing 4 via an external air duct. The pressurization assembly 20 also includes a sliding plate 201. The outer wall of the sliding plate 201 is slidably connected to the inside of the housing 19. A fixing rod 202 is slidably connected inside the sliding plate 201. The outer wall of the fixing rod 202 is fixedly connected to the inside of the housing 19. The lower surface of 201 is attached to the outer wall of the airbag 203; the outer wall of the housing 19 is fixedly connected to a fixing post 21, and a pin assembly 22 is installed inside the fixing post 21. The pin assembly 22 includes multiple pin bodies 221, and the outer wall of the pin body 221 is slidably connected to an arc plate 23. The lower surface of the arc plate 23 is fixedly connected to the upper surface of the mounting block 17; the pin assembly 22 also includes a collar 223, the outer wall of the collar 223 is slidably connected to the inside of the fixing post 21, and the lower surface of the collar 223 is fixedly connected to the outer wall of the pin body 221. An elastic element 222 is fixedly provided on the outer wall of the pin body 221.

[0026] Specifically, the arc-shaped plate 23 has multiple holes inside, and the size of the holes is adapted to the pin body 221. A detachable mounting block 17 is installed on the outer wall of the THMRT housing 4. Then, the housing 19 is connected to the mounting block 17 via the guide post 18. After the housing 19 slides down a certain distance inside the mounting block 17 via the guide post 18, the pin body 221 will contact the arc-shaped plate 23. The special shape of the arc-shaped plate 23 will cause the pin body 221 to move in a centered position inside the fixing post 21, and compress the elastic element 222 while moving. Then, the housing 19 drives the fixing post 21 to continue to slide down. When the fixing post 21 slides down... When the device body is aligned with the hole inside the arc plate 23, the elastic element 222 will release its own elastic force to reset the pin body 221, further causing it to snap into the interior of the arc plate 23, thereby fixing the housing 19 and the mounting block 17. When the device body is submerged in water, the water pressure will cause the sliding plate 201 to slide downward inside the housing 19, further compressing the airbag 203 inside it, and delivering the gas generated by the compressed airbag 203 to the THMRT housing 4 through the external air duct, thereby pressurizing the gas inside the THMRT housing 4 and improving the firmness of the internal connection parts.

[0027] Workflow: First, the mounting block 17 is installed on the outer wall of the THMRT housing 4. Then, the housing 19 is connected to the mounting block 17 via the guide post 18. When the housing 19 slides down along the guide post 18, the pin body 221 will contact the arc plate 23. The special shape of the arc plate 23 will cause the pin body 221 to move in the center within the fixing post 21 and compress the elastic element 222. Then, the housing 19 will drive the fixing post 21 to continue sliding down. When the fixing post 21 is aligned with the hole opened in the arc plate 23, the elastic element 222 releases its own elastic force, causing the pin body 221 to be inserted into the arc plate 23, thereby fixing the housing 19 and the mounting block 17. When the device is submerged in water, the water pressure will drive the sliding plate 201 to slide down within the housing 19, further compressing the airbag 203. The gas in the airbag 203 is sent into the THMRT housing 4 through the conduit, thereby pressurizing the gas in its internal cavity to enhance the stability of its internal connections.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel deep-water spring-storage type tubing hanger recovery tool, used in conjunction with a tubing hanger equipped with an internal ramp (26) and a locking ring (27) and a wellhead with a groove (28), comprising a THMRT mandrel (1), characterized in that: An upper spring housing (2) is fixedly installed inside the THMRT mandrel (1). An upper spring body (3) is fixedly installed on the lower surface of the upper spring housing (2). A THMRT housing (4) is installed on the outer wall of the THMRT mandrel (1). A lower spring (5) is fixedly installed inside the THMRT housing (4). A pressure plate (6) is installed inside the THMRT housing (4). A bearing body (7) is fixedly installed below the pressure plate (6). A screw (8) is installed inside the THMRT housing (4). A lower support ring (9) is fixedly installed at the bottom of the THMRT housing (4). (4) is equipped with a LOCK caliper (10) at the bottom. The outer wall of the LOCK caliper (10) is provided with a LATCH caliper (11). The outer wall of the LATCH caliper (11) is fixedly provided with a sealing sleeve (12). The inside of the THMRT housing (4) is fixedly provided with a threaded ring (13). The inside of the THMRT housing (4) near the threaded ring (13) is fixedly provided with an ACME rotating sleeve (14). The side of the THMRT housing (4) near the ACME rotating sleeve (14) is equipped with an excitation ring (15). The top of the excitation ring (15) is fixedly provided with a guide key (16). The LOCK caliper (10) and LATCH caliper (11) are in a closed state in the initial state. The THMRT housing (4) is provided with a hexagonal special screw (24) to ensure that the guide key (16) is installed on the THMRT spindle (1) and to provide anti-torque when the THMRT spindle (1) rotates. The outer wall of the THMRT housing (4) is provided with a mounting block (17), and a plurality of guide posts (18) are slidably connected inside the mounting block (17). A box (19) is fixedly connected to the outer wall of the guide posts (18). A pressurization assembly (20) is installed inside the box (19). The pressurization assembly (20) includes an airbag (203). The airbag (203) is connected to the inside of the THMRT housing (4) through an external air duct. When the excitation ring (15) moves down, it can squeeze the LOCK caliper (10) and LATCH caliper (11) to spread radially in all directions, so that the LOCK caliper (10) is engaged with the tubing hanger seat seal ring and the LATCH caliper (11) is engaged with the inner ramp (26) of the tubing hanger, thereby locking the recovery tool with the tubing hanger; when the recovery tool is lifted up, it can drive the locking ring (27) of the tubing hanger to disengage from the groove (28) of the production tree and retract inward, thereby unlocking and recovering the tubing hanger from the production tree.

2. The deep-water novel spring-energy-storing tubing suspension recovery tool according to claim 1, characterized in that: The THMRT mandrel (1), upper spring housing (2), THMRT housing (4), bearing body (7), sealing sleeve (12), and ACME rotating sleeve (14) are all cylindrical structures. The THMRT mandrel (1) is narrow at the top, wide in the middle, and narrow at the bottom, with a threaded hole in the middle and lower part. The upper spring housing (2) and THMRT housing (4) are used to load the spring. The bottom of the sealing sleeve (12) has a large rounded corner guide, which facilitates docking with the oil pipe.

3. The deep-water novel spring-energy-storing tubing hanger recovery tool according to claim 1, characterized in that: The lower support ring (9), LOCK caliper (10), LATCH caliper (11), threaded ring (13), and excitation ring (15) are all annular structures, and LOCK caliper (10) and LATCH caliper (11) are the main recycling parts.

4. The deep-water novel spring-energy-storing tubing hanger recovery tool according to claim 1, characterized in that: A shear pin (25) is provided between the bearing body (7) and the lower threaded ring (13), and the shear pin (25) causes the LOCK caliper (10) and LATCH caliper (11) to operate according to the required pressure.

5. The deep-water novel spring-energy-storage type tubing hanger recovery tool according to claim 1, characterized in that: The upper spring body (3) is fixedly installed inside the THMRT spindle (1), the lower surface of the upper spring housing (2) is fixedly installed on the upper surface of the THMRT housing (4), the bearing body (7) is fixedly installed inside the THMRT housing (4), the sealing sleeve (12) is installed on the outer wall of the THMRT spindle (1), and the guide key (16) is fixedly installed inside the THMRT housing (4).

6. The deep-water novel spring-energy-storing tubing hanger recovery tool according to claim 1, characterized in that: The pressurization assembly (20) also includes a sliding plate (201), the outer wall of which is slidably connected to the inside of the housing (19), a fixing rod (202) is slidably connected to the inside of the sliding plate (201), the outer wall of which is fixedly connected to the inside of the housing (19), and the lower surface of the sliding plate (201) is attached to the outer wall of the airbag (203).

7. The deep-water novel spring-energy-storing tubing hanger recovery tool according to claim 1, characterized in that: The outer wall of the housing (19) is fixedly connected to a fixing column (21), and a pin assembly (22) is installed inside the fixing column (21). The pin assembly (22) includes multiple pin bodies (221), and an arc plate (23) is slidably connected to the outer wall of the pin body (221). The lower surface of the arc plate (23) is fixedly connected to the upper surface of the mounting block (17).

8. The deep-water novel spring-energy-storing tubing hanger recovery tool according to claim 7, characterized in that: The pin assembly (22) also includes a collar (223), the outer wall of which is slidably connected to the inside of the fixing post (21), the lower surface of which is fixedly connected to the outer wall of the pin body (221), and an elastic element (222) is fixedly provided on the outer wall of the pin body (221).

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