A hand release bailing bucket suitable for mechanical and hydraulic double action

Abstract

This invention relates to a fishing tool for well workover operations in oil and gas field exploration and development. It discloses a hands-free fishing barrel suitable for both mechanical and hydraulic dual-action. The barrel includes a shell assembly with a central connecting sleeve. An outer piston is fitted onto the outer circumference of the central connecting sleeve, forming a liquid-containing cavity I between the central connecting sleeve and the outer piston. An inner piston is fixedly connected to the central connecting sleeve via a shear pin. The upper ends of the central connecting sleeve and the inner piston enclose a liquid-containing cavity II. A slip and a milling shoe are fixedly connected to the lower end of the outer piston. After a ball is dropped into the neck of the central connecting sleeve, the fluid inside the tubing is pressurized. The fluid enters liquid-containing cavity I, pushing the outer piston upward and causing the slip to move upward. The fluid then enters liquid-containing cavity II, continuing to pressurize, causing the shear pin to break and the inner piston to move downward. This invention's hands-free fishing barrel, suitable for both mechanical and hydraulic dual-action, has a simple structure, is easy to operate, has high operational efficiency, and good performance.

Description

Technical Field

[0001] This invention relates to a retrieval tool for well workover operations in oil and gas field exploration and development, specifically, to a detachable retrieval tube suitable for both mechanical and hydraulic dual-action. Background Technology

[0002] The fish catcher is an essential tool in well workover operations, playing a crucial role in oil, gas, and water well workover. It is commonly used for retrieving fish from coiled tubing, tubing, and rods. During retrieval, a guide shoe guides the fish's head into the tool, and a milling shoe trims the head. When retrieving the fish, it is inserted into the slippers. Lifting the tool causes the slippers to descend, where the fish is secured by the serrated conical surface. Continuing to lift the tool completes the retrieval operation.

[0003] During salvage operations, conventional salvage dredger structures include hydraulic accelerators and shock absorbers, which are complex and have low operational efficiency. When the salvage dredger becomes stuck and the movable dredger method and shock absorber method are ineffective, it is necessary to consider cutting methods, back-clamping methods, and milling methods, which are complex procedures, time-consuming, and inefficient.

[0004] Therefore, it is necessary to develop a hand-operated retrieval cylinder suitable for both mechanical and hydraulic action to solve the above-mentioned technical problems existing in the current technology. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a detachable retrieval cylinder suitable for both mechanical and hydraulic dual-action. This detachable retrieval cylinder can quickly retrieve the pipe string after it gets stuck without using cutting, backing, or milling methods, but by cutting the shearing pin.

[0006] To address the aforementioned technical problems, this invention provides a hand-operated retrieval cylinder suitable for both mechanical and hydraulic action, comprising a retrieval cylinder housing assembly, a central connecting sleeve connected to the housing assembly, an outer piston fitted onto the outer circumferential surface of the central connecting sleeve, a liquid-containing cavity I formed between the central connecting sleeve and the outer piston, an inner piston fixedly connected to the central connecting sleeve via a shear pin, and a slip and a milling shoe fixedly connected to the lower end of the outer piston. After a ball is thrown into the neck of the central connecting sleeve, the fluid inside the tubing is pressurized, and the fluid enters the liquid-containing cavity I, pushing the outer piston upward and causing the slip to move upward; the fluid enters the liquid-containing cavity II, continuing to pressurize, causing the shear pin to break and the inner piston to move downward.

[0007] In some embodiments, the lower end of the inner piston is provided with a retaining ring, and after the shear pin breaks, the inner piston moves downward to the retaining ring.

[0008] In some embodiments, the inner piston is provided with a locking block receiving cavity, the middle connecting sleeve and the lower connecting sleeve are connected by a locking block, and when the inner piston moves downward to the retaining ring, the locking block is adapted to enter the locking block receiving cavity.

[0009] In some embodiments, the slip is provided with a snap-fit ​​groove, and the milling shoe is provided with a snap-fit ​​boss. The snap-fit ​​boss is adapted to snap into the snap-fit ​​groove so that the slip and the milling shoe can snap together.

[0010] In some embodiments, a through hole I and a through hole II are formed on the central connecting sleeve. Both the through hole I and the through hole II are located above the neck, and the through hole I communicates with the liquid receiving cavity I and the through hole II communicates with the liquid receiving cavity II.

[0011] In some embodiments, the lower end of the outer piston is provided with a limiting sleeve, and the limiting sleeve is provided with a plurality of connecting blocks. Each connecting block passes through the middle connecting sleeve and connects to the end connecting hole of the slip.

[0012] In some embodiments, the scooping cylinder housing assembly includes, from top to bottom, an upper connector, an upper connecting sleeve threadedly connected to the upper connector, an upper outer cylinder connected to the upper connecting sleeve via a flat key, and a lower outer cylinder internally threadedly connected to the lower end of the upper outer cylinder, wherein the lower outer cylinder and the lower connector are threadedly connected.

[0013] In some embodiments, the upper part of the upper connector is provided with a rupture disc.

[0014] In some embodiments, the upper connecting sleeve and the middle connecting sleeve are connected by a thread, and an anti-loosening pin is provided between the upper connecting sleeve and the middle connecting sleeve.

[0015] In some embodiments, the central region of the middle connecting sleeve is provided with a connecting sleeve boss, and the upper end of the outer piston is provided with an outer piston flange. A liquid receiving cavity I is formed between the connecting sleeve boss and the outer piston flange.

[0016] Through the above technical solution, the present invention has a central connecting sleeve fixedly connected inside the retrieval tube shell assembly. An outer piston is sleeved on the central connecting sleeve, and an inner piston is provided between the central connecting sleeve and the outer piston. The inner piston is fixedly connected to the central connecting sleeve through a shear pin. A slip is fixedly connected to the lower end of the outer piston. Therefore, when the ball falls into the neck of the central connecting sleeve, the fluid inside the tubing is pressurized, and the fluid enters the liquid receiving chamber I, pushing the outer piston upward and causing the slip to move upward. The fluid enters the liquid receiving chamber II and continues to pressurize, causing the shear pin to break and the inner piston to move downward. At this time, the tubing is pressed down, and the lower connecting sleeve pushes the locking block into the locking block receiving chamber. The connection between the central connecting sleeve and the lower connecting sleeve is broken, and the lower connecting sleeve continues to move upward. The slip causes the fish to move upward. After moving upward, the serrated conical surface at the end of the slip loosens, and the fish is no longer stuck to the serrated conical surface. Thus, after the retrieval tubing gets stuck, the retrieval tube can be released, and the retrieval tubing can be successfully pulled out of the well. The process is simple and the operation efficiency is high.

[0017] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of a hand-operated retrieval tube suitable for both mechanical and hydraulic action in a specific embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the card in a specific embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional view of the kava in a specific embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the card in a specific embodiment of the present invention;

[0023] Figure 5 This is a cross-sectional view of the kava in a specific embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures

[0025] 1. Upper connector 2. Upper connecting sleeve

[0026] 3 flat key 4 upper outer cylinder

[0027] 5. Middle connecting sleeve 501 neck

[0028] 502 Through Hole I 503 Connecting Sleeve Boss

[0029] 504 through-hole II 6 external piston

[0030] 601 outer piston flange 7 inner piston

[0031] 701 Lock Block Receiving Cavity 8 Lock Blocks

[0032] 9. Lower connecting sleeve; 10. Retaining ring

[0033] 11 Lower outer cylinder 12 Limiting sleeve

[0034] 13 Connecting Blocks 14 Kawa

[0035] 1401 Snap-fit ​​groove 1402 End connection hole

[0036] 15 Milling Shoe 1501 Snap-fit ​​Boss

[0037] 16 Lower connector 17 Rupture disc

[0038] 18 Liquid Reception Chamber I 19 Anti-loosening Pin

[0039] 20 Shear pin 21 Liquid containment chamber II Detailed Implementation

[0040] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," or "connection" should be interpreted broadly. For example, the term "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be 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.

[0042] Furthermore, the terms "first" and "second" 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features.

[0043] In this invention, the directional terms used are based on the orientation or positional relationship shown in the accompanying drawings, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. The directional terms of this invention should be understood in conjunction with the actual installation state.

[0044] like Figure 1 As shown, this embodiment of the invention provides a hand-operated retrieval cylinder suitable for both mechanical and hydraulic action, including a retrieval cylinder housing assembly. A central connecting sleeve 5 is connected to the retrieval cylinder housing assembly. An outer piston 6 is fitted onto the outer circumferential surface of the central connecting sleeve 5. A liquid receiving cavity I 18 is formed between the central connecting sleeve 5 and the outer piston 6. An inner piston 7 is fixedly connected to the central connecting sleeve 5 via a shear pin 20. The upper ends of the central connecting sleeve 5 and the inner piston 7 enclose a liquid receiving cavity II 21. A slip 14 and a milling shoe 15 engaged with the slip 14 are fixedly connected to the lower end of the outer piston 6. After the ball is thrown into the neck 501 of the central connecting sleeve 5, the fluid inside the tubing is pressurized and enters the liquid receiving cavity I 18, pushing the outer piston 6 upward and causing the slip 14 to move upward. The fluid enters the liquid receiving cavity II 21 and continues to pressurize, causing the shear pin 20 to break and the inner piston 7 to move downward.

[0045] For ease of explanation, Figure 1 The integral structure formed by the detachable retrieval tube shown and the drill rod (not shown) located above and connected to the detachable retrieval tube of the present invention is a tubular string, while the present invention... Figure 1 The space between the outer circumferential surface of the retrieval tube housing assembly and the inner circumferential surface of the sleeve shown is the sleeve annulus.

[0046] In this invention, the scooping cylinder housing assembly has a through hole extending through both the upper and lower ends along the central axis. A middle connecting sleeve 5 is fixedly connected to the upper part of the scooping cylinder housing assembly. A neck 501 is formed on the middle connecting sleeve 5. A through hole I 502 and a through hole II 504 are formed above the neck 501. The through hole I 502 communicates with the liquid receiving cavity I 18, and the through hole II 504 communicates with the liquid receiving cavity II 21, so that fluid can be input into the liquid receiving cavity I 18 and the liquid receiving cavity II 21. The purpose of this design is that when a fish gets stuck while being retrieved by the scooping tube and cannot be released mechanically, a ball is thrown from the upper opening of the scooping tube housing assembly. The ball is pressurized by the internal fluid, and the ball is located at the neck 501. As the fluid continuously fills the space above the ball, the pressure increases. The fluid enters the liquid receiving chamber 118 through the through hole Ⅰ 502, increasing the pressure in the liquid receiving chamber Ⅰ 18 and pushing the outer piston 6 upward. The fluid enters the liquid receiving chamber Ⅱ 21 through the through hole Ⅱ 504, increasing the pressure in the liquid receiving chamber Ⅱ 21 and pushing the inner piston 7 downward, causing the shear pin 20 to break.

[0047] In some embodiments, the lower end of the inner piston 7 is provided with a retaining ring 10, and after the shear pin 20 breaks, the inner piston 7 moves downward to the retaining ring 10.

[0048] In some possible implementations, the retaining ring 10 is fixedly connected to the central connecting sleeve 5 by anti-loosening pins 19. Preferably, the retaining ring 10 can also be fixedly connected to the central connecting sleeve 5 by other connection methods, such as providing a flange edge on the lower outer circumferential surface of the central connecting sleeve 5, with the retaining ring 10 sleeved on the central connecting sleeve 5, and the retaining ring 10 and the flange edge connected by set screws or by adhesive bonding.

[0049] In some embodiments, the inner piston 7 is provided with a locking block receiving cavity 701, the middle connecting sleeve 5 and the lower connecting sleeve 9 are connected by a locking block 8, and when the inner piston 7 moves downward to the retaining ring 10, the locking block 8 is adapted to enter the locking block receiving cavity 701.

[0050] In some possible implementations, when the inner piston 7 moves downward to the retaining ring 10, the slip 14 can push the lower connecting sleeve 9 upward during its upward movement. The upper and lower surfaces of the locking block 8 are formed as inclined surfaces. Under the push of the lower connecting sleeve 9, the locking block 8 can enter the locking block receiving cavity 701, thereby disconnecting the connection between the middle connecting sleeve 5 and the lower connecting sleeve 9.

[0051] In some embodiments, such as Figures 2 to 5 As shown, the slip 14 is provided with a snap-fit ​​groove 1401, and the milling shoe 15 is provided with a snap-fit ​​boss 1501. The snap-fit ​​boss 1501 is adapted to snap into the snap-fit ​​groove 1401 so that the slip 14 and the milling shoe 15 can snap together.

[0052] In some possible implementations, the locking boss 1501 engages with the locking groove 1401, so that the locking slip 14 can drive the milling shoe 15 to rotate synchronously during rotation. However, when the locking slip 14 moves in the axial direction, the milling shoe 15 does not move synchronously with the locking slip 14.

[0053] In some embodiments, the lower end of the outer piston 6 is provided with a limiting sleeve 12, and the limiting sleeve 12 is provided with a plurality of connecting blocks 13. Each connecting block 13 passes through the middle connecting sleeve 5 and is connected to the end connecting hole 1402 of the slip 14.

[0054] In some embodiments, the scooping cylinder housing assembly includes, from top to bottom, an upper connector 1, an upper connecting sleeve 2 threadedly connected to the upper connector 1, an upper outer cylinder 4 connected to the upper connecting sleeve 2 via a flat key 3, and a lower outer cylinder 11 internally threadedly connected to the lower end of the upper outer cylinder 4. The lower outer cylinder 11 and the lower connector 16 are threadedly connected.

[0055] In some embodiments, the upper part of the upper connector 1 is provided with a rupture disc 17.

[0056] In some embodiments, the upper connecting sleeve 2 and the middle connecting sleeve 5 are connected by a thread, and an anti-loosening pin 19 is provided between the upper connecting sleeve 2 and the middle connecting sleeve 5.

[0057] In some possible implementations, this application is not limited to connecting the upper connecting sleeve 2 and the middle connecting sleeve 5 with anti-loosening pins 19, and connecting the retaining ring 10 with the middle connecting sleeve 5 and the limiting sleeve 12 with the outer piston 6 with anti-loosening pins 19.

[0058] In some embodiments, the central region of the middle connecting sleeve 5 is provided with a connecting sleeve boss 503, and the upper end of the outer piston 6 is provided with an outer piston flange 601. A liquid receiving cavity I18 is formed between the connecting sleeve boss 503 and the outer piston flange 601.

[0059] To better understand the technical concept of this invention, the following description is provided in conjunction with a relatively comprehensive set of technical features.

[0060] like Figure 1 As shown, a preferred embodiment of the present invention provides a hand-operated retrieval cylinder suitable for both mechanical and hydraulic action, comprising a retrieval cylinder housing assembly. This assembly includes, from top to bottom, an upper connector 1, an upper connecting sleeve 2 threadedly connected to the upper connector 1, an upper outer cylinder 4 connected to the upper connecting sleeve 2 via a flat key 3, and a lower outer cylinder 11 internally threadedly connected to the lower end of the upper outer cylinder 4. The lower outer cylinder 11 and the lower connector 16 are threadedly connected. The upper connecting sleeve 2 is threadedly connected to a middle connecting sleeve 5. The middle connecting sleeve 5 has a connecting sleeve boss 503. An outer piston 6 is sleeved on the middle connecting sleeve. On sleeve 5, an outer piston flange 601 is formed at the upper end of the outer piston 6. A liquid receiving cavity I 18 is formed between the connecting sleeve boss 503 and the outer piston flange 601. A through hole 502 on the middle connecting sleeve 5 communicates with the liquid receiving cavity I 18, and a through hole II 504 communicates with the liquid receiving cavity II 21. An inner piston 7 is disposed between the middle connecting sleeve 5 and the outer piston 6. The inner piston 7 is connected to the lower connecting sleeve 9 through a locking block 8. A limiting sleeve 12 is provided on the lower outer circumferential surface of the middle connecting sleeve 5. The limiting sleeve 12 is connected to the slip 14 through multiple connecting blocks 13. The slip 14 is connected to the milling shoe 15. In addition, multiple sealing rings are provided on the inner circumferential surface of the outer piston flange 601, the outer circumferential surface of the connecting sleeve boss 503, the outer and inner circumferential surfaces of the upper end of the inner piston 7, and the outer circumferential surface of the upper end of the middle connecting sleeve 5. A rupture disc 17 is provided at the upper end of the upper connector 1 near the opening.

[0061] The working process of the hand-operated retrieval cylinder suitable for both mechanical and hydraulic dual-action according to a preferred embodiment of the present invention is as follows:

[0062] First, insert the ball from the upper port of the upper connector 1 to the neck 501.

[0063] Second, the internal fluid is pressurized, and the fluid enters the liquid receiving chamber I18 through the through hole I502, pushing the outer piston 6 upward and simultaneously causing the slip 14 to move upward. The fluid enters the liquid receiving chamber II21 through the through hole II504, pushing the inner piston 7 downward, causing the shear pin 20 to break.

[0064] Third, after the clapper 14 moves upward, it abuts against the lower end of the lower connecting sleeve 9, causing the lower connecting sleeve 9 to move upward synchronously, so that the locking block 8 enters the locking block receiving cavity 701, and the connection between the middle connecting sleeve 5 and the lower connecting sleeve 9 is broken.

[0065] Fourth, press down the tubing string, and the lower connecting sleeve 9 moves upward. The slip 14 moves the fish upward. After moving upward, the serrated conical surface at the end of the slip 14 loosens, and the fish is no longer locked to the serrated conical surface. At this time, the tubing string can be rotated and lifted to complete the release action. When lifting the tubing string, the internal fluid can flow into the annulus through the rupture disc 17, which is equivalent to an overflow structure.

[0066] Compared to existing technologies, the hand-operated retrieval tube of the present invention, suitable for both mechanical and hydraulic action, has the following advantages:

[0067] First, the present invention effectively combines a conventional mechanical release retrieval cylinder with a hydraulic release retrieval cylinder, giving the retrieval cylinder both mechanical and hydraulic release functions, which can effectively simplify the quick release of the working string after it gets stuck, and effectively improve the working efficiency.

[0068] Second, in the mechanical and hydraulic dual-acting hand-operated retrieval cylinder of the present invention, the middle connecting sleeve 5, the inner piston 7 and the outer piston 6 are respectively equipped with sealing rings on the inner and outer sides to ensure the dynamic sealing of the liquid receiving cavity I 18 and the liquid receiving cavity II 21.

[0069] Third, in this invention, the middle connecting sleeve 5 and the lower connecting sleeve 9 are locked and unlocked by the locking block 8, and the hydraulic release operation is completed by pressing. The structure is simple and the effect is good.

[0070] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A hand release basked adapted for mechanical and hydraulic double action, characterized in that, The assembly includes a scooping cylinder housing assembly, on which a central connecting sleeve (5) is connected. An outer piston (6) is fitted onto the outer circumferential surface of the central connecting sleeve (5). A liquid receiving cavity I (18) is formed between the central connecting sleeve (5) and the outer piston (6). An inner piston (7) is fixedly connected to the central connecting sleeve (5) via a shear pin (20). The upper ends of the central connecting sleeve (5) and the inner piston (7) enclose a liquid receiving cavity II (21). A slip (14) and a milling shoe (15) engaging with the slip (14) are fixedly connected to the lower end of the outer piston (6). The ball is thrown into the central connecting sleeve housing assembly. After the neck (501) of the connecting sleeve (5) is closed, the fluid inside the tubing is pressurized and enters the liquid receiving chamber I (18), pushing the outer piston (6) upward and causing the slip (14) to move upward; the fluid enters the liquid receiving chamber II (21) and continues to pressurize, causing the shear pin (20) to break and the inner piston (7) to move downward. The inner piston (7) is provided with a locking block receiving chamber (701). The middle connecting sleeve (5) and the lower connecting sleeve (9) are connected by a locking block (8). When the inner piston (7) moves downward to the retaining ring (10), the locking block (8) is suitable to enter the locking block receiving chamber (701).

2. The hand-operated retrieval cylinder suitable for both mechanical and hydraulic action according to claim 1, characterized in that, The retaining ring (10) is located at the lower end of the inner piston (7). After the shear pin (20) breaks, the inner piston (7) moves downward to the retaining ring (10).

3. A mechanically and hydraulically bi-actuated, hand-free bailing bucket according to claim 1, characterized in that, The slip (14) is provided with a snap-fit ​​groove (1401), and the milling shoe (15) is provided with a snap-fit ​​boss (1501). The snap-fit ​​boss (1501) is adapted to snap into the snap-fit ​​groove (1401) so that the slip (14) and the milling shoe (15) can snap together.

4. The mechanically and hydraulically dual-acting, hand- free bailing bucket of claim 1, wherein, The middle connecting sleeve (5) has through hole I (502) and through hole II (504) formed on it. Both through hole I (502) and through hole II (504) are located above the neck (501). Through hole I (502) is connected to liquid receiving cavity I (18) and through hole II (504) is connected to liquid receiving cavity II (21).

5. The hand-operated retrieval cylinder suitable for both mechanical and hydraulic action according to claim 1, characterized in that, The lower end of the outer piston (6) is provided with a limiting sleeve (12), and the limiting sleeve (12) is provided with a plurality of connecting blocks (13). Each connecting block (13) passes through the middle connecting sleeve (5) and is connected to the end connecting hole (1402) of the slip (14).

6. A mechanically and hydraulically bi-actuated, hand-free bailing bucket according to any one of claims 1 to 5, characterized in that, The scooping cylinder housing assembly includes, from top to bottom, an upper connector (1), an upper connecting sleeve (2) threadedly connected to the upper connector (1), an upper outer cylinder (4) connected to the upper connecting sleeve (2) via a flat key (3), and a lower outer cylinder (11) internally threadedly connected to the lower end of the upper outer cylinder (4). The lower outer cylinder (11) and the lower connector (16) are connected by a thread.

7. A mechanically and hydraulically bi-actuated, hand-free bailing bucket according to claim 6, characterized in that, The upper part of the upper connector (1) is provided with a rupture disc (17).

8. The hand-operated retrieval cylinder suitable for both mechanical and hydraulic action according to claim 6, characterized in that, The upper connecting sleeve (2) and the middle connecting sleeve (5) are connected by a thread, and an anti-loosening pin (19) is provided between the upper connecting sleeve (2) and the middle connecting sleeve (5).

9. A mechanically and hydraulically bi-actuated, hand-free bailing bucket according to any one of claims 1 to 5, characterized in that, The central area of ​​the middle connecting sleeve (5) is provided with a connecting sleeve boss (503), and the upper end of the outer piston (6) is provided with an outer piston flange (601). A liquid receiving cavity I (18) is formed between the connecting sleeve boss (503) and the outer piston flange (601).

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