A slip-type hydraulic setting tubing anchor

Abstract

The utility model provides a slip type hydraulic setting tubing anchor belongs to oil well machine mining pipe column technical field. The utility model discloses a center tube, cone, linkage pipe, slip, slip seat, outer sleeve, upper piston and lower piston, the outside slip sleeve linkage pipe of center tube, is provided with the lock block hole of position correspondence and intercommunication on center tube and linkage pipe, is provided with the lock block in the lock block hole, is provided with upper piston and lower piston on the outside of linkage pipe, and upper piston is linked with linkage pipe through release peg, and lower piston is linked with linkage pipe through screw thread connection, and upper piston and lower piston outside are provided with outer sleeve, and the cavity of the combination area of linkage pipe, outer sleeve, upper piston and lower piston is formed, and the cavity and lock block hole position correspondence, and outer sleeve upper end links with slip seat, and slip seat links with slip, and linkage pipe upper end links with cone, and cone links with slip inclined plane sliding fit. It is mainly used for the anchoring of tubing string.

Description

Technical Field

[0001] This utility model belongs to the technical field of oil well production tubing string, and in particular relates to a slip-type hydraulic setting tubing anchor. Background Technology

[0002] In the process of mechanical oil well production, the anchoring of the tubing string is of great significance for improving oil production efficiency and reducing tubing string failures. Traditional mechanical anchoring methods suffer from problems such as tubing string bending and mid-line anchoring, affecting the normal production of the oil well and the life of the tubing string. Therefore, it is necessary to develop a new type of tubing anchoring device to overcome the shortcomings of existing technologies. Utility Model Content

[0003] In view of this, the present invention aims to propose a slip-type hydraulically set oil pipe anchor to solve the problems of existing mechanical anchoring.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a slip-type hydraulically set oil pipe anchor, comprising a central pipe, a cone, a linkage pipe, slips, a slip seat, an outer sleeve, an upper piston, and a lower piston. The linkage pipe is slidably sleeved on the outside of the central pipe. The central pipe and the linkage pipe are provided with corresponding and interconnected locking block holes. A locking block is provided in the locking block hole. The upper piston and the lower piston are provided on the outside of the linkage pipe. The upper piston is connected to the linkage pipe by a release pin. The lower piston is connected to the linkage pipe by a thread. An outer sleeve is provided on the outside of the upper piston and the lower piston. The area enclosed by the linkage pipe, the outer sleeve, the upper piston, and the lower piston forms a chamber. The chamber corresponds to the locking block hole. The upper end of the outer sleeve is connected to the slip seat. The slip seat is connected to the slip. The upper end of the linkage pipe is connected to the cone. The cone and the inclined surface of the slip are slidably connected.

[0005] Furthermore, the upper end of the central tube is connected to the upper connector.

[0006] Furthermore, the lower end of the central tube is connected to the lower connector.

[0007] Furthermore, the outer casing is connected to the lower connector via an anchor pin.

[0008] Furthermore, a spring connects the slip and the slip seat.

[0009] Furthermore, the upper end of the outer jacket is connected to the locking seat via an anti-rotation pin.

[0010] Furthermore, an elastic claw is provided below the lower piston, and a locking groove is provided on the inner wall of the outer sleeve.

[0011] Furthermore, multiple O-rings are provided between the central tube and the linkage tube.

[0012] Furthermore, multiple O-rings are provided between the upper piston, the linkage tube, and the outer sleeve.

[0013] Furthermore, multiple O-rings are provided between the lower piston, the central tube, and the outer sleeve.

[0014] Compared with existing technologies, the advantages of this invention are as follows: This invention utilizes the principle of hydraulic setting, driving the internal mechanism through precisely controlled liquid pressure to achieve a stable and controllable anchoring process. The operation of lifting the tubing string before water filling effectively eliminates the interference of gravity-induced elongation and pressure-induced elongation of the tubing string itself. Combined with the shearing of the release pin under the set pressure value and subsequent pressure stabilization confirmation, the high accuracy of the anchoring position is ensured, fundamentally preventing accidental anchoring midway.

[0015] After successful anchoring, the tubing is lowered to allow it to sit on the four-way upper flange and depressurize smoothly, restoring the tubing to its free state. This reduces the bending stress on the tubing caused by anchoring, effectively protecting the tubing structure, lowering the risk of tubing failure, and extending its service life. Simultaneously, the free state of the tubing significantly reduces frictional losses between the sucker rod and the inner wall of the tubing, thereby improving the pump efficiency of the mechanical extraction system.

[0016] The present invention provides a slip-type hydraulic setting tubing anchor that achieves precise, stable, and reliable anchoring of the tubing in a free state. It not only solves the core defects of traditional mechanical anchoring, which easily leads to tubing bending and mid-way anchoring, but also directly improves oil production efficiency by reducing rod-tube friction and ensures the long-term safe and stable operation of the tubing string. Attached Figure Description

[0017] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0018] Figure 1 This is a schematic diagram of the cross-sectional structure of a slip-type hydraulically set oil pipe anchor according to the present invention;

[0019] Figure 2 This is a schematic diagram of a half-section structure of a slip-type hydraulic setting oil pipe anchor according to the present invention.

[0020] In the picture:

[0021] 1-Upper connector, 2-Center tube, 3-Cone, 4-Linkage tube, 5-Latch, 6-Spring, 7-Latch seat, 8-Anti-rotation pin, 9-Outer sleeve, 10-Release pin, 11-Upper piston, 12-Locking block, 13-Lower piston, 14-Anchoring pin, 15-Lower connector. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0023] See Figure 1-2 This embodiment describes a slip-type hydraulically set oil pipe anchor, comprising a central pipe 2, a cone 3, a linkage pipe 4, slips 5, slip seat 7, an outer sleeve 9, an upper piston 11, and a lower piston 13. The linkage pipe 4 is slidably sleeved on the outside of the central pipe 2. The central pipe 2 and the linkage pipe 4 are provided with corresponding and interconnected locking block holes. A locking block 12 is provided in the locking block hole. The upper piston 11 and the lower piston 13 are provided on the outside of the linkage pipe 4. The upper piston 11 is connected to the linkage pipe 4 by a release pin 10. The lower piston 13 is connected to the linkage pipe 4 by a thread. The outer sleeve 9 is provided on the outside of the upper piston 11 and the lower piston 13. The area enclosed by the linkage pipe 4, the outer sleeve 9, the upper piston 11, and the lower piston 13 forms a chamber. The chamber corresponds to the locking block hole. The upper end of the outer sleeve 9 is connected to the slip seat 7. The slip seat 7 is connected to the slip 5. The upper end of the linkage pipe 4 is connected to the cone 3. The cone 3 and the slip 5 are slidably connected.

[0024] In this embodiment, the upper end of the central tube 2 is connected to the upper connector 1, the lower end of the central tube 2 is connected to the lower connector 15, the outer sleeve 9 is connected to the lower connector 15 through the anchoring pin 14, a spring 6 is connected between the slip 5 and the slip seat 7, the upper end of the outer sleeve 9 is connected to the slip seat 7 through the anti-rotation pin 8, an elastic claw is provided below the lower piston 13, a locking groove is provided on the inner wall of the outer sleeve 9, and multiple O-rings are provided between the central tube 2 and the linkage tube 4, between the upper piston 11 and the linkage tube 4 and the outer sleeve 9, and between the lower piston 13 and the central tube 2 and the outer sleeve 9.

[0025] The upper connector 1 is fixedly connected to the central tube 2, providing an upper connection point for the tool and facilitating connection to the upper components of the tubing. The central tube 2 serves as a liquid flow channel, cooperating with the linkage tube 4 to allow liquid to enter the chamber through its interior and the locking hole of the linkage tube 4. The linkage tube 4 is connected to the lower piston 13 via threads, driving the cone 3 downward under liquid pressure. Its locking hole controls the liquid flow direction and transmits the locking and unlocking actions. The cone 3 works in conjunction with the linkage tube 4 and the slips 5. When the linkage tube 4 moves downward, the cone 3 pushes the slips 5 outward, causing the slip teeth to embed into the inner wall of the sleeve. The slips 5 are supported by the slip seat 7, which restricts the range of motion of the slips 5. The spring 6 provides the initial reset force for the slips 5. The anti-rotation pin 8 is fixed between the slip seat 7 and the outer sleeve 9 to prevent relative rotation between the two. The outer sleeve 9 and the elastic claw of the lower piston 13 form a sawtooth thread pair to constitute a locking mechanism. At the same time, it cooperates with the upper piston 11 and the linkage tube 4 to form a chamber, accommodating liquid and providing space for component movement. The upper piston 11 is fitted onto the linkage pipe 4, and the upper piston 11 and the O-ring are fitted onto the linkage pipe 4 with an interference fit. Under the action of liquid pressure, it participates in the locking mechanism. The release pin 10 is embedded between the upper piston 11 and the linkage pipe 4, and is sheared under a predetermined pressure to trigger the locking mechanism. The locking block 12 is located in the hole of the linkage pipe 4, and locks and unlocks the liquid channel and component linkage during movement. The lower piston 13 is threadedly connected to the linkage pipe 4 and the cone 3. Its elastic claw and the locking mechanism of the outer sleeve 9 ensure the stability of the locking slip after anchoring. The release pin 14 works in conjunction when the locking mechanism is released. The lower connector 15 connects to the lower part of the pipe column. The O-ring seals the connection parts of each component to prevent liquid leakage.

[0026] The working process is divided into two stages: setting and releasing. Setting begins with raising the tubing string 200-400mm before water filling to eliminate gravity-induced elongation and pressure-induced elongation, ensuring accurate anchoring. Liquid enters the chamber formed by the upper piston 11, lower piston 13, outer sleeve 9, and linkage pipe 4 through the locking holes of the central pipe 2 and linkage pipe 4. As the pressure rises to 32-35MPa, the release pin 10 is sheared, at which point the locking block 12 falls out of the chamber. Under the liquid pressure, the lower piston 13 drives the linkage pipe 4 and cone 3 downwards. The cone 3 pushes the slip 5 outwards against the force of the spring 6, firmly embedding the slip teeth into the inner wall of the casing. After stabilizing the pressure for 5 minutes to confirm stable anchoring, the tubing string is lowered so that the tubing is seated into the four-way upper flange. The tubing is then smoothly vented, returning to its free state, completing the anchoring process. The release process is achieved by lifting the oil pipe. The release pin 14 and its cooperating components cause the slip 5 to detach from the inner wall of the casing. Under the restoring force of the spring 6, the slip 5 retracts inward, releasing the anchor.

[0027] Handle all components with care during assembly, avoiding sudden drops or impacts to prevent deformation and damage; ensure all threads are intact and the tool is securely connected to the tubing to prevent fluid leakage. Operate the tubing string smoothly during downhole operation to avoid collisions that could cause premature jamming; after the tubing string is downhole, raise it 200-400mm before filling with water; before pressurizing, vent any gas from the tubing string to ensure smooth fluid entry into the chamber; control the pressurization pressure to 32-35MPa and maintain it for 5 minutes without dropping to verify anchoring reliability; after lowering the tubing string into position under pressure, slowly and steadily depressurize to allow the tool to return to normal operating condition. Precision is crucial throughout the entire process to ensure effective anchoring and tubing string safety.

[0028] The specific embodiments of this utility model disclosed above are merely illustrative of the present utility model. These specific embodiments do not exhaustively describe all details, nor do they limit the utility model to only the described embodiments. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it.

Claims

1. A slip-type hydraulically set tubing anchor, characterized in that: It includes a central tube (2), a cone (3), a linkage tube (4), a slip (5), a slip seat (7), an outer sleeve (9), an upper piston (11), and a lower piston (13). The linkage tube (4) is slidably sleeved on the outside of the central tube (2). The central tube (2) and the linkage tube (4) are provided with corresponding and interconnected locking block holes. A locking block (12) is provided in the locking block hole. The upper piston (11) and the lower piston (13) are provided on the outside of the linkage tube (4). The upper piston (11) and the linkage tube (4) are connected by a release pin (10). The lower piston (13) and the linkage pipe (4) are connected by threads. The upper piston (11) and the lower piston (13) are provided with outer sleeves (9). The area enclosed by the linkage pipe (4), outer sleeve (9), upper piston (11) and lower piston (13) forms a chamber. The chamber corresponds to the position of the locking block hole. The upper end of the outer sleeve (9) is connected to the slip seat (7). The slip seat (7) is connected to the slip (5). The upper end of the linkage pipe (4) is connected to the cone (3). The cone (3) and the slip (5) are connected by a sliding fit on the inclined surface.

2. The slip-type hydraulically set tubing anchor according to claim 1, characterized in that: The upper end of the central tube (2) is connected to the upper connector (1).

3. The slip-type hydraulically set tubing anchor according to claim 1, characterized in that: The lower end of the central tube (2) is connected to the lower connector (15).

4. A slip-type hydraulically set tubing anchor according to claim 3, characterized in that: The outer casing (9) is connected to the lower connector (15) via an anchor pin (14).

5. A slip-type hydraulically set tubing anchor according to claim 1, characterized in that: A spring (6) is connected between the slip (5) and the slip seat (7).

6. A slip-type hydraulically set tubing anchor according to claim 1, characterized in that: The upper end of the outer jacket (9) is connected to the cam seat (7) by an anti-rotation pin (8).

7. A slip-type hydraulically set tubing anchor according to claim 1, characterized in that: An elastic claw is provided below the lower piston (13), and a locking groove is provided on the inner wall of the outer sleeve (9).

8. A slip-type hydraulically set tubing anchor according to claim 1, characterized in that: Multiple O-rings are provided between the central tube (2) and the linkage tube (4).

9. A slip-type hydraulically set tubing anchor according to claim 1, characterized in that: Multiple O-rings are provided between the upper piston (11), the linkage tube (4), and the outer sleeve (9).

10. A slip-type hydraulically set tubing anchor according to claim 1, characterized in that: Multiple O-rings are provided between the lower piston (13), the central tube (2), and the outer sleeve (9).

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