Fixed gas lift valve

Abstract

The utility model discloses a fixed gas lift valve which comprises a main valve body, an inflation cavity and a valve core assembly are arranged at the upper end in the main valve body, a corrugated pipe assembly and a connecting plate are arranged below the inflation cavity, an ejector rod is arranged at the lower end of the corrugated pipe assembly, a valve rod and a first valve ball are arranged at the lower end of the ejector rod, and the first valve ball is connected with a first valve seat in a matched mode. A spring is arranged between the pressing plate and the valve rod, a moving groove is formed in the side, close to the pressing plate, of the connecting plate, a threaded rod is rotationally arranged in the moving groove, an adjusting block is arranged in the moving groove in a sliding mode, a threaded hole is formed in the adjusting block and connected with the threaded rod in a threaded fit mode, and an inclined block is arranged on the side, close to the moving groove, of the pressing plate. The main valve body is provided with an air inlet. Compared with the prior art, the corrugated pipe assembly and the spring are arranged, the corrugated pipe assembly and the spring are used for pressing the valve rod downwards together, so that the upper limit of the pressure of the device on the valve rod is higher, and the application range is wider.

Description

Technical Field

[0001] The utility model belongs to the technical field of petroleum exploitation, and in particular relates to a fixed gas lift valve. Background Art

[0002] Gas lift oil production uses compressed gas to be injected into the bottom of the tubing to mix with the formation fluid. The gas expands in the liquid, reducing the density of the liquid and the weight of the liquid column in the tubing, causing the flow pressure gradient in the tubing to drop, thereby reducing the bottom hole flow pressure and establishing a production pressure difference to lift the liquid to the ground. The gas lift valve is installed on the working cylinder and lowered to a specified depth along with the tubing. The ground controls the opening and closing of the gas lift valve by annular pressurization. The annular pressure acts on the bellows of the gas lift valve, causing the gas lift valve to open, and the annular gas enters the gas lift valve and passes through the check valve on the gas lift valve to enter the tubing to achieve artificial lifting.

[0003] For example, the publication number is CN213807632U, a small oil pipe fixed gas lift valve, including a gas lift valve cavity, the left end of the gas lift valve cavity is connected to the valve core assembly and the tail plug assembly, the right end of the gas lift valve cavity is connected to one end of the guide body, the other end of the guide body is connected to the limiter, a bellows assembly is connected between the gas lift valve cavity and the limiter, and a sealed chamber is between the gas lift valve cavity and the bellows assembly, the outside of the sealed chamber is provided with a protective sleeve, the protective sleeve is connected to the valve seat body, the limiter is connected to the valve core, a valve seat is installed between the valve core and the valve seat body, the valve seat body is connected to a one-way valve body, and a one-way valve head and a spring are arranged in the one-way valve body. The utility model gas lift valve is matched with a small working cylinder, which solves the problems of gas lift rapid drainage, oil production, gas production, etc. of small diameter casing, forming a diversified development of oil and gas wells.

[0004] When the above device is used, gas is injected into the bellows assembly so that the valve core and the valve seat are fitted and abutted. Since the wall of the bellows is relatively thin, the gas storage pressure inside the bellows has a limit value. When applied to the bottom of a deep well or a high-pressure and large-water well, the pressure is relatively large and the continuous gas injection pressure requirement is relatively high. The nitrogen filling pressure inside the bellows cannot reach the required pressure, which is inconvenient to use. Summary of the invention

[0005] The utility model provides a fixed gas lift valve, aiming to solve the problems raised in the background technology.

[0006] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a fixed gas lift valve, comprising: a main valve body, an inflation chamber and a valve core assembly are arranged at the upper end of the main valve body, a bellows assembly and a connecting plate are arranged below the inflation chamber, a push rod is arranged at the lower end of the bellows assembly, a valve stem and a first valve ball are arranged at the lower end of the push rod, the first valve ball is matched and connected with the first valve seat, a pressure plate is slidably arranged on the outer side of the push rod, a spring is arranged between the pressure plate and the valve stem, a movable groove is arranged on the side of the connecting plate close to the pressure plate, a threaded rod is rotatably arranged in the movable groove, an adjusting block is slidably arranged in the movable groove, the adjusting block is provided with a threaded hole which is threadably matched with the threaded rod, an inclined block is arranged on the side of the pressure plate close to the movable groove, and the main valve body is provided with an air inlet.

[0007] Furthermore, a limiting groove is provided below the connecting plate, and a limiting block is provided on the pressing plate, and the limiting block is connected with the limiting groove in a sliding manner.

[0008] Furthermore, an externally threaded connection portion is provided at the lower end of the main valve body, and the main valve body is threadedly connected to the lower valve body through the externally threaded connection portion, a second valve seat is provided inside the externally threaded connection portion, and a second valve ball is provided inside the lower valve body, the second valve ball is connected to the second valve seat through a second spring, and the second valve ball is connected to the second valve seat.

[0009] Furthermore, a sealing gasket is arranged between the second valve ball and the second valve seat.

[0010] Furthermore, a second external threaded connection portion is provided at the lower end of the lower valve body, and the second external threaded connection portion is threadably connected to an external oil pipe.

[0011] Furthermore, a fixing cylinder is fixedly provided on the outer side of the main valve body, the fixing cylinder is provided on the outer side of the threaded rod, and a protective sleeve is clamped and provided on one end of the fixing cylinder away from the main valve body.

[0012] Furthermore, an adjusting dial is provided at one end of the threaded rod away from the main valve body, and the adjusting dial is located inside the protective sleeve.

[0013] Furthermore, a blocking bolt is provided at the upper end of the main valve body.

[0014] Compared with the prior art, the utility model has the following beneficial effects: since the utility model is provided with a main valve body, an inflation chamber, a valve core assembly, a bellows assembly, a connecting plate, a push rod, a spring, a valve stem, a first valve ball, a first valve seat and a pressure plate, when in use, air can be injected into the inflation chamber and the bellows assembly through the valve core assembly, and the bellows assembly and the spring are used together to press down the valve stem, so that the first valve ball and the first valve seat are abutted and connected, so that the upper limit of the pressure of the device on the valve stem is higher and the scope of use is wider. By arranging a movable groove, a threaded rod, an adjusting block and an inclined block, the threaded rod can be rotated to drive the adjusting block to move, and then the inclined block and the pressure plate can be driven to move up and down, so that the downward pressure of the spring on the valve stem is convenient to adjust, and it is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0017] Figure 3 yes Figure 2 Partial schematic diagram at point A in the middle;

[0018] Figure 4 yes Figure 2 Partial schematic diagram at point B in the middle.

[0019] In the figure: 1. main valve body; 2. inflation chamber; 3. bellows assembly; 4. connecting plate; 5. push rod; 6. spring; 7. valve stem; 8. first valve ball; 9. first valve seat; 10. pressure plate; 11. movable groove; 12. threaded rod; 13. adjusting block; 14. inclined block; 15. air inlet hole; 16. limit groove; 17. limit block; 18. external threaded connection; 19. lower valve body; 20. second valve seat; 21. second valve ball; 22. second spring; 23. sealing gasket; 24. second external threaded connection; 25. fixing cylinder; 26. protective sleeve; 27. adjusting dial; 28. sealing bolt; 29. ​​valve core assembly. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1-Figure 4As shown, a fixed gas lift valve comprises: a main valve body 1, an inflation chamber 2 and a valve core assembly 29 are arranged at the upper end of the main valve body 1, a bellows assembly 3 and a connecting plate 4 are arranged below the inflation chamber 2, a push rod 5 is arranged at the lower end of the bellows assembly 3, a valve stem 7 and a first valve ball 8 are arranged at the lower end of the push rod 5, the first valve ball 8 is matched and connected with a first valve seat 9, a pressing plate 10 is slidably arranged on the outer side of the push rod 5, a spring 6 is arranged between the pressing plate 10 and the valve stem 7, a moving groove 11 is arranged on the side of the connecting plate 4 close to the pressing plate 10, a threaded rod 12 is rotatably arranged in the moving groove 11, an adjusting block 13 is slidably arranged in the moving groove 11, the adjusting block 13 is provided with a threaded hole and is threadedly matched with the threaded rod 12, an inclined block 14 is arranged on the side of the pressing plate 10 close to the moving groove 11, an air inlet hole 15 is arranged on the main valve body 1, the spring 6 is in a compressed state, and the lower end of the adjusting block 13 abuts against the inclined block 14, Oil pipes and casings are provided in the oil well. The oil pipes are arranged in the casings. The annular space between the oil pipes and the casings is called the oil-casing annulus. By arranging a main valve body 1, an air filling chamber 2, a valve core assembly 29, a bellows assembly 3, a connecting plate 4, a push rod 5, a spring 6, a valve stem 7, a first valve ball 8, a first valve seat 9 and a pressure plate 10, air can be injected into the air filling chamber 2 and the bellows assembly 3 through the valve core assembly 29 during use, and the bellows assembly 3 and the spring 6 are used to press the valve stem 7 downward, so that the first valve ball 8 is abutted and connected with the first valve seat 9, so that the upper limit of the pressure of the device on the valve stem 7 is higher and the scope of use is wider. By arranging a movable groove 11, a threaded rod 12, an adjusting block 13 and an inclined block 14, the threaded rod 12 can be rotated to drive the adjusting block 13 to move, and then the inclined block 14 and the pressure plate 10 can be driven to move up and down, so that the downward pressure of the spring 6 on the valve stem 7 is adjusted, and it is more convenient to use.

[0022] A limiting groove 16 is provided under the connecting plate 4, and a limiting block 17 is provided on the pressing plate 10. The limiting block 17 is slidably connected with the limiting groove 16. By providing the limiting groove 16 and the limiting block 17, the pressing plate 10 can be guided and limited to prevent the pressing plate 10 from rotating and deviating, so that the pressing plate 10 moves more smoothly.

[0023] An externally threaded connection part 18 is provided at the lower end of the main valve body 1, and the main valve body 1 is threadedly connected with the lower valve body 19 through the externally threaded connection part 18, a second valve seat 20 is provided inside the externally threaded connection part 18, and a second valve ball 21 is provided inside the lower valve body 19. The second valve ball 21 is connected to the second valve seat 20 through a second spring 22, and the second valve ball 21 is matched and connected with the second valve seat 20. A sealing gasket 23 is provided between the second valve ball 21 and the second valve seat 20. By providing the externally threaded connection part 18, the lower valve body 19, the second valve seat 20, the second valve ball 21, the second spring 22 and the sealing gasket 23, the second spring 22 is used to push the second valve ball 21 upward against the second valve seat 20, and the sealing gasket 23 is provided between the second valve ball 21 and the second valve seat 20, so that the second valve ball 21 and the second valve seat 20 have better sealing performance, thereby preventing the liquid inside the oil pipe from flowing into the lower valve body 19 and the main valve body 1.

[0024] A second external threaded connection portion 24 is provided at the lower end of the lower valve body 19, and the second external threaded connection portion 24 is threadedly connected to the external oil pipe. By providing the second external threaded connection portion 24 and threadedly connected to the external oil pipe, the connection is more convenient.

[0025] A fixing cylinder 25 is fixedly arranged on the outside of the main valve body 1, and the fixing cylinder 25 is arranged on the outside of the threaded rod 12. A protective sleeve 26 is clamped on the end of the fixing cylinder 25 away from the main valve body 1, and an adjusting dial 27 is arranged on the end of the threaded rod 12 away from the main valve body 1. The adjusting dial 27 is located inside the protective sleeve 26, and a blocking bolt 28 is arranged on the upper end of the main valve body 1. By arranging the fixing cylinder 25, the protective sleeve 26 and the adjusting dial 27, the adjusting dial 27 can conveniently drive the threaded rod 12 to rotate, and the protective sleeve 26 and the fixing cylinder 25 are used to protect the threaded rod 12 to prevent the threaded rod 12 from being damaged by collision.

[0026] The working principle of the utility model is as follows: when in use, air can be injected into the inflation chamber 2 and the bellows assembly 3 through the valve core assembly 29, the inflation chamber 2 can be sealed and protected by the sealing bolt 28, the second external threaded connection part 24 can be connected with the external oil pipe thread, the bellows assembly 3 and the spring 6 can be used to press the valve stem 7 downward, so that the first valve ball 8 and the first valve seat 9 can be abutted and connected, so that the upper limit of the pressure of the device on the valve stem 7 is higher and the scope of use is wider. By setting the moving groove 11, the threaded rod 12, the adjusting block 13 and the inclined block 14, the threaded rod 12 can be rotated to drive the adjusting block 13 to move, and then the inclined block 14 and the pressure plate 10 can be driven to move up and down, so that the valve stem 7 can be pressed down by the bellows assembly 3 and the spring 6. The downward pressure of the spring 6 on the valve stem 7 is adjusted, which is more convenient to use. The second spring 22 pushes the second valve ball 21 upward to press against the second valve seat 20. The sealing gasket 23 is arranged between the second valve ball 21 and the second valve seat 20, so that the second valve ball 21 and the second valve seat 20 have better sealing performance, preventing the liquid inside the oil pipe from flowing into the lower valve body 19 and the main valve body 1. When high-pressure gas is injected into the annulus, the gas enters the main valve body 1 from the air inlet 15 and pushes the valve stem 7 and the first valve ball 8 upward. The high-pressure gas can enter the lower valve body 19 from the main valve body 1 and finally enter the inside of the oil pipe, reducing the density of the liquid in the pipe and the weight of the liquid column in the oil pipe. This is the working principle of the device.

[0027] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A fixed gas lift valve, characterized in that: The invention comprises a main valve body (1), wherein an inflation chamber (2) and a valve core assembly (29) are arranged at the upper end of the main valve body (1), a bellows assembly (3) and a connecting plate (4) are arranged below the inflation chamber (2), a push rod (5) is arranged at the lower end of the bellows assembly (3), a valve stem (7) and a first valve ball (8) are arranged at the lower end of the push rod (5), the first valve ball (8) is cooperatively connected to a first valve seat (9), a pressure plate (10) is slidably arranged on the outer side of the push rod (5), and the pressure plate (10) is connected to the valve stem ( 7), a spring (6) is arranged between the connecting plate (4) and the pressure plate (10), a movable groove (11) is arranged on the side of the connecting plate (4) close to the pressure plate (10), a threaded rod (12) is rotatably arranged in the movable groove (11), an adjustment block (13) is slidably arranged in the movable groove (11), the adjustment block (13) is provided with a threaded hole and is threadably connected to the threaded rod (12), an inclined block (14) is arranged on the side of the pressure plate (10) close to the movable groove (11), and the main valve body (1) is provided with an air inlet hole (15).

2. A fixed gas lift valve according to claim 1, characterized in that: A limiting groove (16) is provided below the connecting plate (4), and a limiting block (17) is provided on the pressing plate (10), wherein the limiting block (17) is connected to the limiting groove (16) in a sliding manner.

3. A fixed gas lift valve according to claim 2, characterized in that: The main valve body (1) is provided with an external threaded connection portion (18) at the lower end, and the main valve body (1) is threadedly connected to the lower valve body (19) via the external threaded connection portion (18), a second valve seat (20) is provided inside the external threaded connection portion (18), and a second valve ball (21) is provided inside the lower valve body (19), the second valve ball (21) is connected to the second valve seat (20) via a second spring (22), and the second valve ball (21) is connected to the second valve seat (20) in a threaded manner.

4. A fixed gas lift valve according to claim 3, characterized in that: A sealing gasket (23) is provided between the second valve ball (21) and the second valve seat (20).

5. A fixed gas lift valve according to claim 3, characterized in that: A second external threaded connection portion (24) is provided at the lower end of the lower valve body (19), and the second external threaded connection portion (24) is threadably connected to an external oil pipe.

6. A fixed gas lift valve according to claim 2, characterized in that: A fixing cylinder (25) is fixedly provided on the outside of the main valve body (1), the fixing cylinder (25) being arranged on the outside of the threaded rod (12), and a protective sleeve (26) is clamped and provided on one end of the fixing cylinder (25) away from the main valve body (1).

7. A fixed gas lift valve according to claim 6, characterized in that: An adjusting dial (27) is provided at one end of the threaded rod (12) away from the main valve body (1), and the adjusting dial (27) is located inside the protective sleeve (26).

8. A fixed gas lift valve according to claim 2, characterized in that: A blocking bolt (28) is provided at the upper end of the main valve body (1).

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