Novel external salvage balance valve blanking plug

Abstract

The utility model discloses a novel external salvage balance valve blanking plug which comprises an external salvage head, a balance valve element is fixedly installed at the lower end of the external salvage head, an adjusting nut is arranged on the balance valve element in a sleeved mode, a telescopic cylinder is fixedly connected to the lower end of the adjusting nut, the balance valve element is located in the telescopic cylinder, and a positioning cylinder is installed at the lower end of the telescopic cylinder through a connecting piece. The lower end of the positioning cylinder is fixedly connected with a sealing mandrel, the lower end of the sealing mandrel is fixedly connected with a balance valve seat, the lower end of the balance valve seat is fixedly connected with a plug, the lower end of a balance valve element is provided with a slip through a second shear pin, a balance hole is formed in the balance valve seat, and two first O-shaped rings are arranged at the lower end of the balance valve element. According to the utility model, the outer fishing head is rotated to drive the balance valve core to rotate, so that the position of the shearing hole can be quickly adjusted, and the shearing pin is more convenient to replace.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, and in particular to a new external retrieval balance valve blocker. Background Technology

[0002] In oil and gas well production enhancement operations, it is often necessary to isolate the upper and lower passages within the tubing at specific locations and achieve upper and lower seals. The common method is to connect a working tube to the production tubing string. When upper and lower isolation of the production tubing string is required, a wellhead plug or wireline plug is placed inside the pre-installed working tube; the two work together to achieve upper and lower isolation and sealing within the tubing. Balance valve plugs can achieve both upper and lower pressure bearing and sealing. Currently, the externally retrieved balance valve plugs used in the industry, after prolonged downhole operation, accumulate large amounts of sediment during oil well production, burying the plug's retrieval head and sealing the balancing orifice that balances the pressure difference. This increases the difficulty and risk of retrieval and recovery of the plug; furthermore, replacing components such as shear pins is difficult during tool use.

[0003] To address this, a novel external salvage balance valve plugger is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a new external retrieval balance valve blocker, thereby solving or at least alleviating one or more of the aforementioned problems and other issues existing in the prior art.

[0005] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0006] A novel external retrieval balance valve plugger includes an external retrieval head. A balance valve core is fixedly mounted on the lower end of the external retrieval head. A step is formed at the upper end of the balance valve core. An adjusting nut is fitted onto the balance valve core and is mounted on the step. A telescopic cylinder is fixedly connected to the lower end of the adjusting nut. The balance valve core is located inside the telescopic cylinder. A positioning cylinder is mounted to the lower end of the telescopic cylinder via a connector. A sealing mandrel is fixedly connected to the lower end of the positioning cylinder. A balance valve seat is fixedly connected to the lower end of the sealing mandrel. A plug is fixedly connected to the lower end of the balance valve core. The end is fitted with a slip via a second shear pin. The sealing mandrel has a first shear hole, and the balance valve core has a second shear hole. A first shear pin is inserted into the second shear hole, with the end of the first shear pin extending into the first shear hole. The balance valve seat has a balance hole, and the lower end of the balance valve core is provided with two first O-rings. When the balance valve core moves downward, the balance hole is located between the two first O-rings, and the balance hole is in a closed state. When the balance valve core moves upward, the balance hole is located below the first O-rings, and the balance hole is in an open state.

[0007] According to the present invention, a new external retrieval balance valve plugger is provided, wherein the external retrieval head and the balance valve core are fixedly connected by threads, and the lower end of the external retrieval head is threaded with a second set screw for further locking the balance valve core.

[0008] In a new external retrieval balance valve plug according to the present invention, the telescopic cylinder and the adjusting nut are fixedly connected by threads, and the lower end of the adjusting nut is threaded with a third set screw for further locking the telescopic cylinder.

[0009] According to this utility model, a new external retrieval balance valve plugger is provided, wherein the sealing mandrel and the positioning cylinder, the sealing mandrel and the balance valve seat, and the balance valve seat and the plug are all fixedly connected by threads; the balance valve seat and the sealing mandrel are sealed by a V-ring and a second O-ring; and the plug and the balance valve seat are sealed by a third O-ring.

[0010] According to this utility model, a novel external retrieval balance valve plugger includes a connecting member comprising a spring and a positioning key. The positioning key has a slot, and the upper end of the positioning cylinder has a locking hole. The locking hole has a strip-shaped hole and an assembly groove, the strip-shaped hole being connected to the assembly groove. The positioning key is disposed within the assembly groove. The upper end of the spring is bent into a locking head, which is locked within the locking hole. The spring has a protrusion located within the strip-shaped hole. One end of the spring, away from the locking hole, extends into the locking groove. A limiting groove is formed on the surface of the telescopic cylinder, and the spring abuts against the limiting groove. The spring and the limiting groove are slidably connected.

[0011] According to the present invention, a new external retrieval balance valve blocker is provided, wherein the external retrieval head is provided with a retrieval part.

[0012] In a novel external retrieval balance valve plug according to the present invention, a first set screw for limiting the first shear pin is installed in the internal thread of the first shear hole.

[0013] This utility model has at least the following beneficial effects:

[0014] This invention controls the opening and closing of the balance hole on the balance valve seat by controlling the up and down movement of the balance valve core. While ensuring the pressure difference between the top and bottom is balanced when the blockage is retrieved, it avoids the phenomenon of a large amount of mud and sand deposited during oil well production blocking the balance hole.

[0015] In addition, the external retrieval head is designed for external retrieval, which facilitates the retrieval of the blockage and reduces the difficulty of retrieval.

[0016] When the shear pin needs to be replaced, the outer retrieval head is rotated, which in turn drives the balance valve core to rotate, thereby quickly adjusting the position of the shear hole and making the replacement of the shear pin more convenient. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 This is a schematic diagram of the new external salvage balance valve blocker structure of this utility model;

[0019] Figure 2 This is a cross-sectional view of the balance hole of this utility model in the open state.

[0020] Figure 3 This is a cross-sectional view of the balance hole of this utility model in the closed state.

[0021] Figure 4 This is a schematic diagram of the connection structure between the balance valve core and the slip of this utility model;

[0022] Figure 5 This is a schematic diagram of the positioning cylinder structure of this utility model.

[0023] Explanation of icon numbers:

[0024] 1. External retrieval head; 101. Retrieval section; 2. Adjusting nut; 3. Telescopic cylinder; 301. Limiting groove; 4. Positioning cylinder; 401. Locking hole; 402. Strip hole; 403. Assembly groove; 5. Spring; 6. Positioning key; 601. Locking groove; 7. Sealing mandrel; 8. Balance valve seat; 801. Balance hole; 9. Plug; 10. Balance valve core; 11. Locking slip; 12. First shearing pin; 13. Second shearing pin; 14. V-ring; 15. First O-ring; 16. Second O-ring; 17. Third O-ring; 18. First set screw; 19. Second set screw; 20. Third set screw. Detailed Implementation

[0025] The following will describe in detail the implementation of this application with reference to the accompanying drawings and embodiments, so that the implementation process of how this application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0026] Please refer to Figures 1 to 5As shown, this utility model provides a new external retrieval balance valve plugger. An external retrieval head 1 has a balance valve core 10 fixedly installed at its lower end. A step is provided at the upper end of the balance valve core 10. An adjusting nut 2 is fitted onto the balance valve core 10, and the adjusting nut 2 is fitted onto the step. A telescopic cylinder 3 is fixedly connected to the lower end of the adjusting nut 2. The balance valve core 10 is located inside the telescopic cylinder 3. A positioning cylinder 4 is installed at the lower end of the telescopic cylinder 3 via a connector. A sealing mandrel 7 is fixedly connected to the lower end of the positioning cylinder 4. A balance valve seat 8 is fixedly connected to the lower end of the sealing mandrel 7. A plug 9 is fixedly connected to the lower end of the balance valve core 10. A slip 11 is installed at the lower end of the balance valve core 10 via a second shear pin 13. A first shear pin 13 is provided on the sealing mandrel 7. A shearing hole is provided on the balance valve core 10, and a second shearing hole is provided on the balance valve core 10. A first shearing pin 12 is inserted into the second shearing hole, and the end of the first shearing pin 12 extends into the first shearing hole. In order to prevent the first shearing pin 12 from disengaging, a first set screw 18 for limiting the first shearing pin 12 is installed in the thread of the first shearing hole. A balance hole 801 is provided on the balance valve seat 8. Two first O-rings 15 are provided at the lower end of the balance valve core 10. When the balance valve core 10 moves downward, so that the balance hole 801 is located between the two first O-rings 15, the balance hole 801 is in the closed state. When the balance valve core 10 moves upward, so that the balance hole 801 is located below the first O-rings 15, the balance hole 801 is in the open state.

[0027] In this embodiment, the connecting component includes a spring 5 and a positioning key 6. The positioning key 6 has a slot 601, and the upper end of the positioning cylinder 4 has a slot 401. The slot 401 has a strip hole 402 and an assembly groove 403. The strip hole 402 is connected to the assembly groove 403. The positioning key 6 is located in the assembly groove 403. The upper end of the spring 5 is bent into a locking head, which is locked in the slot 401. The spring 5 has a protrusion located in the strip hole 402. The end of the spring 5 away from the slot 401 extends into the slot 601. The surface of the telescopic cylinder 3 has a limiting groove 301. The spring 5 abuts against the limiting groove 301. The spring 5 and the limiting groove 301 are slidably connected. By using the spring 5 in conjunction with the positioning key 6, the telescopic cylinder 3 becomes more stable during its up-and-down movement.

[0028] By adopting the above scheme, during use, the blocker is lowered into the working cylinder to be sealed using a wire tool, and the outer retrieval head 1 is vibrated downwards. The downward vibration force cuts the first shear pin 12, causing the balance valve core 10 to move downwards. The downward movement of the balance valve core 10 drives the first O-ring 15 to move downwards. When the balance valve seat 8 is between the two first O-rings 15, the balance valve core 10 closes the balance valve seat 8, preventing external mud and sand from clogging the balance hole 801. When it is necessary to retrieve the blocker, the outer retrieval head 1 is pulled upwards. At this time, the balance valve core 10 moves upwards through the outer retrieval head 1. After the first O-ring 15 is removed from the balance hole 801, the balance hole 801 opens, allowing the blocker to be retrieved quickly.

[0029] When it is necessary to replace the shear pin, the outer retrieval head 1 is rotated by a wire tool. The rotating outer retrieval head 1 drives the balance valve core 10 to rotate, thereby quickly adjusting the position of the shearing hole and facilitating the quick replacement of the shear pin.

[0030] In this embodiment, the telescopic cylinder 3 and the adjusting nut 2 are fixedly connected by threads. The lower end of the adjusting nut 2 is threaded with a third set screw 20 for further locking the telescopic cylinder 3, thereby facilitating the connection between the adjusting nut 2 and the telescopic cylinder 3.

[0031] The outer retrieval head 1 and the balance valve core 10 are fixedly connected by threads, and the lower end of the outer retrieval head 1 is threaded with a second set screw 19 for further locking the balance valve core 10.

[0032] In this embodiment, the sealing mandrel 7 and the positioning cylinder 4, the sealing mandrel 7 and the balance valve seat 8, and the balance valve seat 8 and the plug 9 are all connected by threads. The balance valve seat 8 and the sealing mandrel 7 are sealed by a V-ring 14 and a second O-ring 16, and the plug 9 and the balance valve seat 8 are sealed by a third O-ring 17. These features improve the sealing performance of the plug.

[0033] To facilitate the retrieval of the blockage device, a retrieval section 101 is provided on the outer retrieval head 1.

[0034] The foregoing description illustrates and describes several preferred embodiments of the present invention. However, as previously stated, it should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the inventive concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A novel external retrieval balance valve plugger, characterized in that, The device includes an external retrieval head (1), with a balance valve core (10) fixedly installed at its lower end. A step is provided at the upper end of the balance valve core (10), and an adjusting nut (2) is fitted onto the balance valve core (10). The adjusting nut (2) is fitted onto the step, and a telescopic cylinder (3) is fixedly connected to the lower end of the adjusting nut (2). The balance valve core (10) is located inside the telescopic cylinder (3). A positioning cylinder (4) is installed at the lower end of the telescopic cylinder (3) via a connector. A sealing mandrel (7) is fixedly connected to the lower end of the positioning cylinder (4). A balance valve seat (8) is fixedly connected to the lower end of the sealing mandrel (7). A plug (9) is fixedly connected to the lower end of the balance valve core (10). A second shear pin (13) connects to the lower end of the balance valve core (10). The valve core (10) is equipped with a slip (11), and a first shearing hole is provided on the sealing mandrel (7). A second shearing hole is provided on the balance valve core (10). A first shearing pin (12) is inserted into the second shearing hole, and the end of the first shearing pin (12) extends into the first shearing hole. A balance hole (801) is provided on the balance valve seat (8). Two first O-rings (15) are provided at the lower end of the balance valve core (10). When the balance valve core (10) moves downward, the balance hole (801) is located between the two first O-rings (15), and the balance hole (801) is in a closed state. When the balance valve core (10) moves upward, the balance hole (801) is located below the first O-rings (15), and the balance hole (801) is in an open state.

2. A novel external retrieval balance valve plugger according to claim 1, characterized in that: The outer retrieval head (1) and the balance valve core (10) are fixedly connected by threads, and the lower end of the outer retrieval head (1) is threaded with a second set screw (19) for further locking the balance valve core (10).

3. A novel external retrieval balance valve plugger according to claim 2, characterized in that: The telescopic cylinder (3) and the adjusting nut (2) are fixedly connected by threads, and the lower end of the adjusting nut (2) is threaded with a third set screw (20) for further locking the telescopic cylinder (3).

4. A novel external retrieval balance valve plugger according to claim 3, characterized in that: The sealing mandrel (7) and the positioning cylinder (4), the sealing mandrel (7) and the balance valve seat (8), and the balance valve seat (8) and the plug (9) are all fixedly connected by threads. The balance valve seat (8) and the sealing mandrel (7) are sealed by a V-ring (14) and a second O-ring (16). The plug (9) and the balance valve seat (8) are sealed by a third O-ring (17).

5. A novel external retrieval balance valve plugger according to claim 4, characterized in that: The connector includes a spring (5) and a positioning key (6). The positioning key (6) has a slot (601). The upper end of the positioning cylinder (4) has a hole (401). The hole (401) has a strip hole (402) and an assembly groove (403). The strip hole (402) is connected to the assembly groove (403). The positioning key (6) is disposed in the assembly groove (403). The upper end of the spring (5) is bent into a retaining shape. The head is fitted into the card hole (401). The spring (5) is provided with a protrusion located in the strip hole (402). One end of the spring (5) away from the card hole (401) extends into the card groove (601). A limiting groove (301) is opened on the surface of the telescopic cylinder (3). The spring (5) abuts against the limiting groove (301). The spring (5) and the limiting groove (301) are slidably connected.

6. A novel external retrieval balance valve plugger according to claim 5, characterized in that: The external retrieval head (1) is provided with a retrieval part (101).

7. A novel external retrieval balance valve plugger according to claim 6, characterized in that: The first shearing hole is threaded with a first set screw (18) for limiting the first shearing pin (12).

Images