An oil production wellhead natural gas recovery device

Abstract

The present invention relates to a natural gas recovery device for an oil production wellhead applied in the field of natural gas recovery, which includes a filter, a compressor and a storage tank. The filter includes an arc-shaped cylinder. An outlet pipe and an inlet pipe are respectively fixedly connected to the top end and the bottom end of the arc-shaped cylinder. An inner plate is arranged inside the arc-shaped cylinder. Two air holes are opened in the middle of the inner plate. Filter nets are installed inside both of the two air holes. Through the above settings, when natural gas passes through the filter nets for filtration, the air pressure is relatively small. Therefore, impurities are only located on the surface of the filter nets and do not penetrate into the interior of the filter nets. In this way, the adhesion of the impurities is relatively low, making the impurities attached to the surface of the filter nets easier to break away from the filter nets, and making the subsequent cleaning more efficient. When natural gas blows from the upper side to the lower side of the filter nets, the air pressure is relatively large. Therefore, it can better blow off the impurities blocked on the lower side of the filter nets, enabling the entire wellhead gas recovery device to operate continuously better.

Description

Technical Field

[0001] The present invention relates to a natural gas recovery device, in particular to an oil production wellhead natural gas recovery device applied to the field of natural gas recovery. Background Art

[0002] Chinese Patent with publication number CN117052369B discloses a skid-mounted wellhead gas recovery device, which uses a filter and a compressor to recover natural gas at the oil production wellhead. When the filter is in use, the airflow of natural gas drives the centrifugal cylinder to rotate to separate impurities in the natural gas, and cooperates with a filter screen to intercept impurities in the natural gas. When using the filter screen to intercept impurities in the natural gas, the filter screen is vibrated by knocking the vibration sleeve. The vibrating filter screen is beneficial to eject the fine particles intercepted on the filter screen from the mesh holes of the filter screen, playing an automatic cleaning role.

[0003] Since the pressure of natural gas at the wellhead is not fixed, the cleaning effect of the centrifugal cylinder is limited. The filter screen plays a major filtering role, but it is only cleaned by knocking, and the cleaning effect is limited, and the entire wellhead gas recovery device cannot operate continuously for a long time. Summary of the Invention

[0004] Aiming at the above-mentioned prior art, the technical problem to be solved by the present invention is that since the pressure of natural gas at the wellhead is not fixed, the cleaning effect of the centrifugal cylinder is limited. The filter screen plays a major filtering role, but it is only cleaned by knocking, and the cleaning effect is limited, and the entire wellhead gas recovery device cannot operate continuously for a long time.

[0005] To solve the above problems, the present invention provides an oil production wellhead natural gas recovery device, including a filter, a compressor and a storage tank. The filter includes an arc-shaped cylinder. The top and bottom ends of the arc-shaped cylinder are respectively fixedly connected with an outlet pipe and an inlet pipe. An inner plate is arranged inside the arc-shaped cylinder. Two air holes are opened in the middle of the inner plate. Filter screens are installed inside both of the two air holes. Electric adjusting rods are fixedly connected to the top and bottom surfaces of the inner plate. Air blowing pipes and air collecting pipes are also fixedly connected to the top and bottom surfaces of the inner plate. One ends of the air blowing pipes and the air collecting pipes are hermetically and slidably connected with receiving and extending pipes. One end of the receiving and extending pipe is fixedly connected with a cover sleeve. One end of the cover sleeve is in contact with the inner plate. The side wall of the arc-shaped cylinder is fixedly connected with a back-blowing pipe and an external discharge pipe. The back-blowing pipe and the external discharge pipe are respectively located on the upper side and the lower side of the inner plate. One ends of the back-blowing pipe and the air blowing pipe, and one ends of the external discharge pipe and the air collecting pipe are connected and communicated through flexible connecting pipes. A recovery pipe is fixedly connected to the side wall of the outlet pipe. An upper gas valve and a lower gas valve are respectively fixedly connected to the outer walls of the back-blowing pipe and the recovery pipe. One end of the recovery pipe is connected and communicated with the compressor, and the compressor is connected and communicated with the storage tank.

[0006] As a further improvement of the present application, one end of the external discharge pipe is fixedly connected with a mounting block. A rotating shaft is rotatably connected to the middle of the mounting block. One end of the mounting block is fixedly connected with a motor, and the output end of the motor is fixedly connected with one end of the rotating shaft.

[0007] As a further improvement of the present application, one end of the rotating shaft is fixedly connected with a vertical pipe, and an igniter is fixedly connected to the top end of the vertical pipe. A flexible intermediate pipe is fixedly connected between the vertical pipe and the external discharge pipe.

[0008] As a further improvement of the present application, a heat conduction ring is fixedly connected to the outer wall of the backwashing pipe close to the arc-shaped cylinder.

[0009] As another improvement of the present application, the filter screen includes a square frame. Two opposing plates are fixedly connected to the inner wall of the square frame, and a movable plate is slidably connected between the two opposing plates.

[0010] As a supplement to another improvement of the present application, a cylinder is fixedly connected to the side wall of the square frame close to the movable plate. A piston is slidably connected to the inner wall of the cylinder. A push rod is fixedly connected to the side wall of the piston, and the output end of the push rod is fixedly connected to the movable plate.

[0011] As a supplement to another improvement of the present application, multiple flexible steel wires arranged in a line are fixedly connected between the side wall of the movable plate and the inner walls of multiple square frames.

[0012] As another improvement of the present application, the middle part of the arc-shaped cylinder is set as an inverted cone, the upper part of the arc-shaped cylinder is set as a regular cone, and the inner plate is located in the middle of the arc-shaped cylinder.

[0013] As another improvement of the present application, an electric telescopic rod is fixedly connected to the top end of the arc-shaped cylinder, the telescopic end of the electric telescopic rod is fixedly connected with one end of the inner plate, and an elastic sealing film is fixedly connected between the outer wall of the inner plate and the arc-shaped cylinder.

[0014] In summary, when natural gas passes through the filter screen for filtration, the air pressure is relatively small. Therefore, the impurities are only located on the surface of the filter screen and do not penetrate into the interior of the filter screen. In this way, the adhesion of the impurities is relatively low, making it easier for the impurities attached to the surface of the filter screen to break away from the filter screen, making subsequent cleaning more efficient. When natural gas is backwashed from the upper side to the lower side of the filter screen, the air pressure is relatively large. Therefore, it can better blow off the impurities blocked on the lower side of the filter screen, enabling the entire wellhead gas recovery device to operate better continuously;

[0015] By setting the inverted cone-shaped arc cylinder and the electric telescopic rod, the position of the inner plate can be automatically adjusted according to the pressure change of the natural gas at the wellhead, optimizing the air pressure borne by the filter screen, thereby improving the gas flow effect and preventing impurities from entering the interior of the filter screen;

[0016] During the process of backwashing and cleaning the filter screen, the gas can also be heated to keep the filter screen relaxed, further improving the cleaning effect. Brief Description of the Drawings

[0017] Figure 1 It is the recovery flowchart of wellhead natural gas in the first and second implementation manners of this application;

[0018] Figure 2 It is the front elevation sectional view at the arc cylinder in the first implementation manner of this application;

[0019] Figure 3 It is the state diagram when the inner plate is located in the middle of the inverted cone in the first implementation manner of this application;

[0020] Figure 4 It is the front elevation sectional view at the inner plate in the first implementation manner of this application;

[0021] Figure 5 It is the state diagram when the cover sleeve covers the filter screen in the first implementation manner of this application;

[0022] Figure 6 It is the front elevation sectional view at the square frame in the second implementation manner of this application;

[0023] Figure 7 It is the top plan sectional view at the square frame in the second implementation manner of this application;

[0024] Figure 8 It is the top plan sectional view at the mounting block in the second implementation manner of this application.

[0025] Explanation of the reference numerals in the figure:

[0026] 1. Filter; 2. Compressor; 3. Storage tank; 4. Arc cylinder; 5. Outlet pipe; 6. Inlet pipe; 7. Inner plate; 701. Air hole; 8. Filter screen; 801. Square frame; 802. Opposite plate; 803. Movable plate; 804. Cylinder; 805. Piston; 806. Push rod; 807. Flexible steel wire rope; 9. Electric telescopic rod; 10. Electric adjusting rod; 11. Blowing pipe; 12. Gas collecting pipe; 13. Gas collecting and extending pipe; 14. Elastic sealing film; 15. Cover sleeve; 16. Backwashing pipe; 1601. Upper gas valve; 17. Outer discharge pipe; 18. Flexible connecting pipe; 19. Recovery pipe; 1901. Lower gas valve; 20. Mounting block; 21. Rotating shaft; 22. Motor; 23. Vertical pipe; 24. Igniter; 25. Heat conducting ring; 26. Flexible intermediate pipe. Specific implementation manners

[0027] The following makes a detailed description of the two implementation manners of this application with reference to the accompanying drawings.

[0028] The first implementation manner:

[0029] Figures 1-5Disclosed is a natural gas recovery device for an oil production wellhead, which includes a filter 1, a compressor 2 and a storage tank 3. The filter 1 includes an arc-shaped cylinder 4. The top and bottom ends of the arc-shaped cylinder 4 are respectively fixedly connected with an outlet pipe 5 and an inlet pipe 6. An inner plate 7 is arranged inside the arc-shaped cylinder 4. Two air holes 701 are opened in the middle of the inner plate 7. Filter nets 8 are installed inside both of the two air holes 701. Electric adjusting rods 10 are fixedly connected to the top and bottom surfaces of the inner plate 7. Air blowing pipes 11 and air collecting pipes 12 are also fixedly connected to the top and bottom surfaces of the inner plate 7. One ends of the air blowing pipes 11 and the air collecting pipes 12 are hermetically and slidably connected with extension pipes 13. One end of the extension pipe 13 is fixedly connected with a cover sleeve 15. One end of the cover sleeve 15 is attached to the inner plate 7. An anti-blowing pipe 16 and an external discharge pipe 17 are fixedly connected to the side wall of the arc-shaped cylinder 4. The anti-blowing pipe 16 and the external discharge pipe 17 are respectively located on the upper side and the lower side of the inner plate 7. One ends of the anti-blowing pipe 16 and the air blowing pipe 11, and one ends of the external discharge pipe 17 and the air collecting pipe 12 are connected and communicated through flexible connecting pipes 18. A recovery pipe 19 is fixedly connected to the side wall of the outlet pipe 5. Upper gas valves 1601 and lower gas valves 1901 are respectively fixedly connected to the outer walls of the anti-blowing pipe 16 and the recovery pipe 19. One end of the recovery pipe 19 is connected and communicated with the compressor 2, and the compressor 2 is connected and communicated with the storage tank 3.

[0030] The natural gas at the wellhead enters the inside of the arc-shaped cylinder 4 through the inlet pipe 6 and is discharged through the outlet pipe 5. Since the space inside the arc-shaped cylinder 4 is relatively large, when the natural gas flows inside the arc-shaped cylinder 4, the air pressure decreases. At the same time, the impurities in the natural gas are filtered by the filter net 8. When the filtered natural gas is discharged through the outlet pipe 5, the air pressure increases. The lower gas valve 1901 is opened to discharge the filtered natural gas into the inside of the compressor 2 for compression and storage inside the storage tank 3.

[0031] When the filter net 8 becomes blocked, the two electric adjusting rods 10 are started simultaneously to drive the extension pipes 13 to move, so that the cover sleeve 15 covers one of the filter nets 8, and the lower gas valve 1901 is closed, and the upper gas valve 1601 is opened. The filtered natural gas blows the filter net 8 through the anti-blowing pipe 16 and the air blowing pipe 11, and the impurities blocking the filter net 8 are discharged outwards through the air collecting pipe 12 and the external discharge pipe 17.

[0032] Since the air pressure is relatively small when the natural gas is filtered through the filter net 8, the impurities are only located on the surface of the filter net 8 and do not penetrate into the inside of the filter net 8. In this way, the adhesion of the impurities is relatively low, making it easier for the impurities attached to the surface of the filter net 8 to break away from the filter net 8, making the subsequent cleaning more efficient. When the natural gas blows from the upper side to the lower side of the filter net 8, the air pressure is relatively large. Therefore, it can better blow off the impurities blocking the lower side of the filter net 8, enabling the entire wellhead gas recovery device to operate continuously better.

[0033] The second implementation method:

[0034] Figures 2-8There is shown a natural gas recovery device for an oil production wellhead. Different from the first embodiment, one end of the external discharge pipe 17 is fixedly connected with a mounting block 20. A rotating shaft 21 is rotatably connected to the middle of the mounting block 20. One end of the mounting block 20 is fixedly connected with a motor 22. The output end of the motor 22 and one end of the rotating shaft 21 are fixedly connected. One end of the rotating shaft 21 is fixedly connected with a vertical pipe 23. The top end of the vertical pipe 23 is fixedly connected with an igniter 24. A flexible intermediate pipe 26 is fixedly connected between the vertical pipe 23 and the external discharge pipe 17. A heat conducting ring 25 is fixedly connected to the outer wall of the backwashing pipe 16 close to the arc-shaped cylinder 4.

[0035] The filter screen 8 includes a square frame 801. Two opposing plates 802 are fixedly connected to the inner wall of the square frame 801. A movable plate 803 is slidably connected between the two opposing plates 802. A cylinder 804 is fixedly connected to the side wall of the square frame 801 close to the movable plate 803. A piston 805 is slidably connected to the inner wall of the cylinder 804. A push rod 806 is fixedly connected to the side wall of the piston 805. The output end of the push rod 806 and the movable plate 803 are fixedly connected. A plurality of flexible steel wire ropes 807 arranged in a line are fixedly connected between the side wall of the movable plate 803 and the inner walls of a plurality of square frames 801.

[0036] When natural gas is discharged from the external discharge pipe 17, it will enter the interior of the vertical pipe 23. At this time, the igniter 24 is started to ignite the natural gas, and the motor 22 is started to drive the igniter 24 to rotate to the lower side of the heat conducting ring 25 to heat it. At this time, the natural gas inside the backwashing pipe 16 is heated, so that the temperature of the natural gas backwashed onto the filter screen 8 increases. Then the temperature inside the cylinder 804 rises and the pressure increases, causing the movable plate 803 to move to the right, resulting in the relaxation of a plurality of flexible steel wire ropes 807, making it easier for the dust clogged on the flexible steel wire ropes 807 to be blown off. After the flexible steel wire ropes 807 are cleaned, the motor 22 is started to rotate to move the compressor 2 away from the heat conducting ring 25. At this time, the temperature of the natural gas backwashed onto the filter screen 8 decreases, the temperature inside the cylinder 804 decreases and the pressure becomes smaller, causing the cylinder 804 to move to the left, and the flexible steel wire ropes 807 return to the filtering state again. Through the above settings, the filter screen 8 can be better cleaned.

[0037] The middle part of the arc-shaped cylinder 4 is set as an inverted cone, and the upper part of the arc-shaped cylinder 4 is set as a regular cone. The inner plate 7 is located in the middle of the arc-shaped cylinder 4. An electric telescopic rod 9 is fixedly connected to the top end of the arc-shaped cylinder 4. The telescopic end of the electric telescopic rod 9 is fixedly connected with one end of the inner plate 7. An elastic sealing film 14 is fixedly connected between the outer wall of the inner plate 7 and the arc-shaped cylinder 4.

[0038] Since the pressure of the natural gas discharged from the oil well is variable, excessive pressure will cause impurities to enter the interior of the filter screen 8. Through the above settings, the middle part of the arc-shaped cylinder 4 is set as an inverted cone. The air pressure below the inverted cone is greater than that above. Starting the electric telescopic rod 9 can drive the inner plate 7 to move up and down, changing the air pressure received by the filter screen 8 within a reasonable range.

[0039] Combined with the current actual requirements, the above-mentioned implementation manner adopted in this application, the protection scope is not limited thereto. Within the scope of knowledge possessed by those skilled in the art, various changes made without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. An oil production wellhead natural gas recovery device, comprising a filter (1), a compressor (2) and a storage tank (3), characterized in that: The filter (1) includes an arc-shaped cylinder (4). The top and bottom ends of the arc-shaped cylinder (4) are respectively fixedly connected with an outlet pipe (5) and an inlet pipe (6). An inner plate (7) is arranged inside the arc-shaped cylinder (4). Two air holes (701) are formed in the middle of the inner plate (7). Filter nets (8) are installed inside both of the two air holes (701). Electric adjusting rods (10) are fixedly connected to both the top surface and the bottom surface of the inner plate (7). An air blowing pipe (11) and an air collecting pipe (12) are also fixedly connected to both the top surface and the bottom surface of the inner plate (7). One ends of the air blowing pipe (11) and the air collecting pipe (12) are hermetically and slidably connected with an extending pipe (13). One end of the extending pipe (13) is fixedly connected with a cover sleeve (15). One end of the cover sleeve (15) is in contact with the inner plate (7). An anti-blowing pipe (16) and an external discharge pipe (17) are fixedly connected to the side wall of the arc-shaped cylinder (4). The anti-blowing pipe (16) and the external discharge pipe (17) are respectively located on the upper side and the lower side of the inner plate (7). One ends of the anti-blowing pipe (16) and the air blowing pipe (11), and one ends of the external discharge pipe (17) and the air collecting pipe (12) are connected and communicated through flexible connecting pipes (18). A recovery pipe (19) is fixedly connected to the side wall of the outlet pipe (5). Upper air valves (1601) and lower air valves (1901) are respectively fixedly connected to the outer walls of the anti-blowing pipe (16) and the recovery pipe (19). One end of the recovery pipe (19) is connected and communicated with a compressor (2). The compressor (2) is connected and communicated with a storage tank (3).

2. The natural gas recovery device for an oil production wellhead according to claim 1, wherein: One end of the external discharge pipe (17) is fixedly connected with a mounting block (20). A rotating shaft (21) is rotatably connected to the middle of the mounting block (20). One end of the mounting block (20) is fixedly connected with a motor (22). The output end of the motor (22) is fixedly connected with one end of the rotating shaft (21).

3. The natural gas recovery device for an oil production wellhead according to claim 2, wherein: One end of the rotating shaft (21) is fixedly connected with a vertical pipe (23). An igniter (24) is fixedly connected to the top end of the vertical pipe (23). A flexible intermediate pipe (26) is fixedly connected between the vertical pipe (23) and the external discharge pipe (17).

4. The natural gas recovery device for an oil production wellhead according to claim 3, wherein: A heat conducting ring (25) is fixedly connected to the outer wall of the anti-blowing pipe (16) close to the arc-shaped cylinder (4).

5. The natural gas recovery device for an oil production wellhead according to claim 1, characterized in that: The filter net (8) includes a square frame (801). Two opposing plates (802) are fixedly connected to the inner wall of the square frame (801). A movable plate (803) is slidably connected between the two opposing plates (802).

6. The natural gas recovery device for an oil production wellhead according to claim 5, characterized in that: A cylinder (804) is fixedly connected to the side wall of the square frame (801) close to the movable plate (803). A piston (805) is slidably connected to the inner wall of the cylinder (804). A push rod (806) is fixedly connected to the side wall of the piston (805). The output end of the push rod (806) is fixedly connected with the movable plate (803).

7. The natural gas recovery device for an oil production wellhead according to claim 6, characterized in that: Multiple flexible steel wire ropes (807) arranged in a line are fixedly connected between the side wall of the movable plate (803) and the inner walls of multiple square frames (801).

8. The natural gas recovery device for an oil production wellhead according to claim 1, characterized in that: The middle part of the arc-shaped cylinder (4) is in an inverted conical shape, and the upper part of the arc-shaped cylinder (4) is in a regular conical shape. The inner plate (7) is located in the middle of the arc-shaped cylinder (4).

9. The natural gas recovery device for an oil production wellhead according to claim 8, wherein: The top end of the arc-shaped cylinder (4) is fixedly connected with an electric telescopic rod (9), the telescopic end of the electric telescopic rod (9) is fixedly connected with one end of the inner plate (7), and an elastic sealing film (14) is fixedly connected between the outer wall of the inner plate (7) and the arc-shaped cylinder (4).

Images