Blanking plug

Abstract

The invention relates to a blanking plug which comprises a seating joint, a fishing neck joint and a recovery neck, the recovery neck is sleeved with the seating joint, a locking groove is formed in the seating joint, and a key block matched with the locking groove is arranged between the recovery neck and the seating joint; the fishing neck connector is sleeved with the recovery neck, a lining is arranged at the lower end of the recovery neck and arranged between the fishing neck connector and the seating connector, the lower end of the lining is fixed to the upper end of the baffle ring, and the lining and the fishing neck connector are fixed through a shear pin. And an expansion sleeve is sleeved on the bushing. By arranging the expansion sleeve and the spring, when the recovery neck or salvage neck connector moves in the axial direction, the axial movement of the expansion sleeve is converted into the radial movement of the key block, the key block is ejected into or slides out of the locking groove, locking or disengaging of the seating connector, the salvage neck connector and the recovery neck is achieved, and the problem that the blocking process is unstable is solved. The recycling structure and the locking structure are both rigid structures, so that recycling of tools is facilitated, and the blocking function is ensured to be stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the oil and gas field equipment technical field, specifically relates to a kind of plugs. BACKGROUND

[0002] For the oil well needing to operate under pressure, in order to avoid the liquid in the oil well to leak, leading to pollution, it is often necessary to first block the bottom, ensure that the upper end operation is completed, and then carry out other construction operations.

[0003] The conventional plug is mainly through the slip engagement mode, which needs to be realized by tubing pressurization, and is difficult to recover. SUMMARY

[0004] The present application provides a kind of plugs, and the blocking function is stable, and recovery is convenient.

[0005] The technical scheme adopted by the present application is: a kind of plugs, characterized by: including sitting joint, fishing neck joint and recovery neck, the recovery neck is sleeved in the sitting joint, the sitting joint is equipped with locking groove, the recovery neck and the sitting joint are equipped with key block matched with locking groove;The fishing neck joint is sleeved in the recovery neck, the lower end of the recovery neck is equipped with bushing, the bushing is arranged between the fishing neck joint and the sitting joint, the lower end of the bushing is fixed with the upper end of the stop ring, and the bushing and the fishing neck joint are fixed by shear pin; The bushing is sleeved with expansion sleeve, the recovery neck moves, drives the expansion sleeve to move together, drives the spring on the recovery neck to top the key block into the locking groove, and the key block and the sawtooth thread on the expansion sleeve are gradually engaged, and the sitting joint, the fishing neck joint and the recovery neck are in the locked state.

[0006] As preferred, the upper end of the bushing is fixed with the sleeve cover matched with the key block.

[0007] As preferred, the stop ring is provided with a through pressure transmission hole.

[0008] As preferred, the lower end of the fishing neck joint is fixed with the upper end of the insertion rod cap, and the lower end of the insertion rod cap is fixed with the plug cap.

[0009] As preferred, the sitting joint, the fishing neck joint and the recovery neck are in the locked state, and the side wall of the insertion rod cap blocks the pressure transmission hole on the stop ring.

[0010] As preferred, the upper part of the fishing neck joint is provided with a lug, and the recovery neck is provided with an inner boss matched with the lug.

[0011] As preferred, the upper end of the fishing neck joint is fixed with the fishing neck connected with the fishing tool.

[0012] As preferred, a sealing element is arranged between the recovery neck and the bushing.

[0013] As preferred, a sealing member is arranged between the bushing and the blocking ring.

[0014] As preferred, a sealing member is arranged between the plug cap and the blocking cap.

[0015] The present application has the following advantages: the axial movement of the expansion sleeve is converted into the radial movement of the key block, the key block is pushed into or slides out of the locking groove, the sitting joint is locked or released with the fishing neck joint and the recovery neck, the unstable situation during plugging is solved, and the bidirectional pressure can be resisted. The unblocking process of the plug is completed step by step, the movement sequence is obvious, and the recovery is convenient. The sealing mode of static sealing is adopted, and the plugging effect is good. The recovery structure and the locking structure are rigid structures, which facilitates the recovery of the tool and ensures the stability of the plugging function. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a structure diagram of the plug of the present application (locking state); Fig. 2 It is a recovery state diagram of the plug; In the figure: 2, sitting joint; 21, locking groove; 3, fishing neck; 4, fishing neck joint; 41, lug; 5, recovery neck; 51, inner boss; 6, sleeve; 7, spring; 8, key block; 9, expansion sleeve; 10, bushing; 11, plug cap; 12, blocking ring; 121, pressure transmission hole; 13, blocking cap; 14, sealing member. DETAILED DESCRIPTION

[0017] The technical solutions of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0018] As shown in the figure, a plug of the present application includes a sitting joint 2, a fishing neck joint 4 and a recovery neck 5. The recovery neck 5 is sleeved in the sitting joint 2. The sitting joint 2 is provided with a locking groove 21. The key block 8 is arranged between the recovery neck 5 and the sitting joint 2 and cooperates with the locking groove. When the key block 8 is pushed into the locking groove 21, the sitting joint 2, the fishing neck joint 4 and the recovery neck 5 are in the locking state, which ensures the stability of the plugging function. When the key block 8 slides out of the locking groove 21, the sitting joint 2, the fishing neck joint 4 and the recovery neck 5 are in the released state, which facilitates the recovery of the fishing neck joint 4 and the recovery neck 5. Figs. 1-2

[0019] ​The salvage neck connector 4 is fitted inside the recovery neck 5. The lower end of the recovery neck 5 is provided with a bushing 10. The outer wall of the lower end of the bushing 10 is fixedly connected to the outer wall of the upper end of the retaining ring (12) by threads. The bushing 10 is set between the salvage neck connector 4 and the landing connector 2. The bushing 10 and the salvage neck connector 2 are fixed by shear pins. An expansion sleeve 9 is fitted on the bushing 10. When the recovery neck 5 moves downward, it drives the expansion sleeve 9 to move downward as well, which drives the spring 7 on the recovery neck 5 to move. The spring 7 pushes the key block 8 into the locking groove 21. At the same time, the key block 8 and the sawtooth thread on the expansion sleeve 9 gradually mesh. The landing connector 2, the salvage neck connector 4 and the recovery neck 5 are in a locked state. During the entire movement, the axial movement of the expansion sleeve 9 is converted into the radial movement of the key block 8. As long as the recovery neck 5 does not move axially, the key block 8 will always be locked inside the locking groove 21 of the landing connector 2 to ensure the stability of the blocking function.

[0020] In this embodiment, the retaining ring 12 is provided with a through pressure transmission hole 121. The lower inner wall of the retrieval neck connector 4 is fixed to the upper outer wall of the insertion cap 11 by threads, and the lower outer wall of the insertion cap 11 is fixed to the inner wall of the plug cap 13 by threads. A sealing element 14 is provided between the rod cap 11 and the plug cap 13, and between the insertion cap 11 and the retaining ring 12, to seal the pressure transmission hole 121 on the retaining ring 12. When the landing connector 2, the retrieval neck connector 4 and the recovery neck 5 are in the locked state, the side wall of the insertion cap 11 blocks the pressure transmission hole 121 on the retaining ring 12, and the entire plugger completes the blocking function.

[0021] In this embodiment, the upper end of the bushing 10 is fixedly provided with a cover 6 that cooperates with the key block 8, the upper part of the retrieval neck connector 4 is provided with a lug 41, the retrieval neck 5 is provided with an inner boss 51 that cooperates with the lug 41, the upper end of the retrieval neck connector 4 is fixedly provided with a retrieval neck 3 that is connected to the retrieval tool, and a sealing element 14 is provided between the retrieval neck 5 and the bushing 10, and between the bushing 10 and the retaining ring 12.

[0022] After the retrieval tool connects to the retrieval neck 3, the retrieval tool drives the retrieval neck 3 to move upward, simultaneously driving the insertion cap 11 and plug cap 13 at the lower end of the retrieval neck connector 4 to move upward together. When the pressure transmission hole 121 of the retaining ring 12 separates from the plug cap 13, the pressure transmission hole 121 loses its seal. Continuing to move upward, when the lug 41 of the retrieval neck connector 4 contacts the inner boss 51 of the recovery neck 5, the retrieval neck connector 4 drives the recovery neck 5 to move upward together. At this time, the sawtooth thread of the key block 8 meshing with the expansion sleeve 9 gradually separates, the spring 7 rotates, and the key block 8 is retracted from the locking groove 21 into the sleeve 6. The expansion sleeve 9 drives the sleeve 6 to move upward together, and the sleeve 6, bushing 10 and retaining ring 12 are fixedly connected. When the retrieval neck 3 continues to move upward, the entire plug is removed together, completing the unsealing process.

[0023] In practical use, the plug of this invention converts the axial movement of the expansion sleeve 9 into the radial movement of the key block 8, ensuring a good fit between the key block 8 and the locking groove 21. This effectively solves the problem of unstable plugging and allows it to withstand bidirectional pressure. The unsealing process of the plug is completed step by step, with a clear sequence of movements. It employs a static sealing method, resulting in excellent plugging performance. Both the recovery structure and the locking structure are rigid, facilitating tool retrieval and ensuring stable plugging function.

[0024] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims.

[0025] Finally, it should be noted that the above embodiments are merely representative examples of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention should be considered within the protection scope of the present invention.

Claims

1. A blocker, characterized in that: It includes a landing joint (2), a retrieval neck joint (4) and a recovery neck (5). The recovery neck (5) is fitted inside the landing joint (2). The landing joint (2) is provided with a locking groove. A key block (8) that cooperates with the locking groove is provided between the recovery neck (5) and the landing joint (2). The salvage neck connector (4) is fitted inside the recovery neck (5). The lower end of the recovery neck (5) is provided with a bushing (10). The bushing (10) is set between the salvage neck connector (4) and the landing connector (2). The lower end of the bushing (10) is fixed to the upper end of the retaining ring (12). The bushing (10) and the salvage neck connector (4) are fixed by shear pins. An expansion sleeve (9) is fitted on the bushing (10). When the recovery neck (5) moves, it causes the expansion sleeve (9) to move together, which causes the spring (7) on the recovery neck (5) to push the key block (8) into the locking groove. At the same time, the key block (8) and the sawtooth thread on the expansion sleeve (9) gradually mesh, and the landing joint (2), the retrieval neck joint (4) and the recovery neck (5) are in a locked state.

2. The blocker according to claim 1, characterized in that: The upper end of the bushing (10) is fixedly provided with a cover (6) that cooperates with the key block (8).

3. The blocker according to claim 1, characterized in that: The retaining ring (12) is provided with a through pressure transmission hole (121).

4. The blocker according to claim 3, characterized in that: The lower end of the salvage neck connector (4) is fixed to the upper end of the insertion cap (11), and the lower end of the insertion cap (11) is fixed to the plug cap (13).

5. The blocker according to claim 4, characterized in that: The landing joint (2), the retrieval neck joint (4) and the recovery neck (5) are in a locked state, and the side wall of the insert cap (11) blocks the pressure transmission hole (121) on the retaining ring (12).

6. The blocker according to claim 1, characterized in that: The upper part of the salvage neck connector (4) is provided with a lug (41), and the retrieval neck (5) is provided with an inner boss (51) that cooperates with the lug (41).

7. The blocker according to claim 1, characterized in that: The upper end of the salvage neck connector (4) is fixedly provided with a salvage neck (3) that is connected to the salvage tool.

8. The blocker according to claim 1, characterized in that: A seal (14) is provided between the recovery neck (5) and the bushing (10).

9. The blocker according to claim 1, characterized in that: A seal (14) is provided between the bushing (10) and the retaining ring (12).

10. The blocker according to claim 4, characterized in that: A sealing element (14) is provided between the plug cap (11) and the plug cap (13).

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