Automatic liquid drainage type gas well downhole throttler

Abstract

The utility model discloses an automatic liquid drainage type gas well downhole throttler, which belongs to the technical field of downhole throttlers, and comprises a central pipe, a liquid drainage mechanism comprises a cavity arranged in a fixed cylinder, the upper end face and the lower end face of the fixed cylinder are respectively provided with a liquid inlet and a liquid drainage groove which are communicated with the cavity, and the liquid drainage groove is communicated with the cavity. A containing groove is formed in the bottom face in the cavity, a telescopic rod is arranged in the containing groove, a baffle located under the liquid inlet is fixedly connected to the upper end face of the telescopic rod, and a spring located between the baffle and the bottom of the containing groove is arranged on the outer wall of the telescopic rod. When the pressure in the liquid inlet above the baffle is larger than that of the spring, the telescopic rod drives the baffle to move downwards, meanwhile, the baffle extrudes the spring, the upper end face of the baffle is made to be separated from the inner top face of the cavity, accumulated liquid enters from the liquid inlet and then is discharged through the liquid discharging groove, the accumulated liquid above the throttler is conveniently discharged, practicability is high, the pressure spring is protected, and the service life of the throttler is prolonged. And the normal use of the throttler is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of downhole chokes, in particular to an automatic liquid-draining downhole choke for a gas well. Background Art

[0002] A throttle is a component in a hydraulic system that regulates fluid flow and generates a pressure drop. Various throttles are used in different aspects of industrial construction and play their respective roles in our industrial construction. The downhole throttling process installs the downhole throttle at an appropriate position in the oil pipe, which can achieve throttling and pressure reduction in the wellbore. At the same time, the formation heat can be used to heat the low-temperature natural gas after throttling, reduce the natural gas pressure after throttling and the hydrate production temperature, thereby preventing the formation of hydrate blockage and improving gas well production. With the development of society, the application of downhole throttles has become more and more extensive. Therefore, the demand for a natural gas downhole throttle is growing.

[0003] Most of the existing downhole chokes have a simple structure and a single function. When the natural gas in the gas well is discharged, the underground liquid will be brought out, resulting in liquid accumulation above the choke, which affects the normal use of the choke and has poor practicality. In addition, the compression spring of the existing choke is exposed. When the choke is placed in the gas well, the compression spring may be damaged, causing it to malfunction and affect the normal use of the choke. Utility Model Content

[0004] In order to solve the problems in the above background, the utility model provides an automatic drainage type gas well downhole throttle, which is convenient for discharging the accumulated liquid above the throttle, has strong practicality, protects the compression spring, and does not affect the normal use of the throttle.

[0005] The utility model is achieved in this way: an automatic drainage type gas well downhole choke, comprising a central tube, the lower part of the outer wall of the central tube is threadedly connected to a valve cover interface, the outer wall of the central tube is slidably connected to a valve located above the valve cover interface, the upper part of the outer wall of the central tube is fixedly connected to a fixed cylinder, a plurality of array-distributed drainage mechanisms are arranged inside the fixed cylinder, the drainage mechanism comprises a cavity opened inside the fixed cylinder, the upper and lower end surfaces of the fixed cylinder are respectively provided with a liquid inlet and a drainage groove communicating with the cavity, the inner bottom surface of the cavity is provided with a placement groove, a telescopic rod is arranged inside the placement groove, the upper end surface of the telescopic rod is fixedly connected to a baffle located just below the liquid inlet, and the outer wall of the telescopic rod is provided with a spring located between the baffle and the bottom of the placement groove;

[0006] The outer wall of the central tube is slidably connected with an adjustment ring located below the fixed tube. The outer wall of the central tube is provided with a compression spring located between the adjustment ring and the valve. A bellows is provided between the fixed tube and the valve.

[0007] In order to facilitate changing the position of the adjustment ring, as a preferred automatic liquid-draining gas well downhole throttle of the present invention, the upper end surface of the adjustment ring is fixedly connected with a threaded sleeve, and the threaded sleeve is threadedly connected to the fixed tube.

[0008] In order to increase the sealing performance of the baffle, as a preferred automatic liquid-draining gas well downhole throttle of the present invention, a sealing gasket is fixedly connected to the upper end surface of the baffle.

[0009] In order to facilitate the installation of the bellows, as an automatic liquid-draining gas well downhole throttle device of the present invention, the lower end surface of the fixed tube and the upper end surface of the valve are both provided with slots, and the upper and lower ends of the bellows are respectively clamped in the inside of the two slots.

[0010] In order to enable the bellows to move with the valve, as an automatic liquid-draining gas well downhole choke of the present invention, the bellows is preferably made of rubber.

[0011] In order to allow liquid to enter the valve cover interface, as an automatic drainage type gas well downhole throttle preferably in the present invention, the outer wall of the central pipe is provided with a plurality of drainage ports located inside the valve cover interface.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model is provided with a drainage mechanism. When too much liquid accumulates above the throttle, the pressure in the liquid inlet above the baffle is greater than the pressure of the spring, the telescopic rod drives the baffle to move downward, and at the same time the baffle squeezes the spring, so that the upper end surface of the baffle is separated from the internal top surface of the cavity, so that the accumulated liquid enters from the liquid inlet and is then discharged through the drainage groove, thereby reducing the accumulated liquid above the throttle and facilitating the discharge of the accumulated liquid above the throttle. The utility model has strong practicality.

[0014] The upper and lower ends of the bellows are respectively clamped in the two clamping grooves, which makes it easy to disassemble and replace the bellows. The bellows protects the compression spring, allowing the spring to work normally without affecting the normal use of the throttle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the overall structure diagram of an automatic liquid-draining downhole choke for a gas well according to the utility model;

[0016] Figure 2 This is the overall cutaway structural diagram of the present utility model;

[0017] Figure 3 For this utility model Figure 2 Enlarged view of point A in the middle.

[0018] In the figure, 1. center tube; 2. valve cover interface; 3. valve; 4. adjustment ring; 5. compression spring; 6. fixing tube; 7. bellows; 8. threaded sleeve; 9. cavity; 10. drainage groove; 11. liquid inlet; 12. placement groove; 13. telescopic rod; 14. spring; 15. baffle; 16. sealing gasket; 17. slot; 18. drainage port. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] In the description of the present invention, it should be understood that the terms "length," "width," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, in the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0021] See also Figure 1-3 , an automatic drainage type gas well downhole choke, including a central tube 1, the lower part of the outer wall of the central tube 1 is threadedly connected to a valve cover interface 2, the outer wall of the central tube 1 is slidably connected to a valve 3 located above the valve cover interface 2, the upper part of the outer wall of the central tube 1 is fixedly connected to a fixed cylinder 6, the interior of the fixed cylinder 6 is provided with a plurality of array-distributed drainage mechanisms, the drainage mechanism includes a cavity 9 opened in the interior of the fixed cylinder 6, the upper and lower end surfaces of the fixed cylinder 6 are respectively provided with a liquid inlet 11 and a drainage groove 10 connected to the cavity 9, the inner bottom surface of the cavity 9 is provided with a placement groove 12, the interior of the placement groove 12 is provided with a telescopic rod 13, the upper end surface of the telescopic rod 13 is fixedly connected to a baffle 15 located just below the liquid inlet 11, and the outer wall of the telescopic rod 13 is provided with a spring 14 located between the baffle 15 and the bottom of the placement groove 12;

[0022] The outer wall of the central tube 1 is slidably connected to an adjusting ring 4 located below the fixed tube 6. The outer wall of the central tube 1 is provided with a compression spring 5 located between the adjusting ring 4 and the valve 3. A bellows 7 is provided between the fixed tube 6 and the valve 3.

[0023] In this embodiment, when in use, when the pressure inside the central tube 1 is too high, the liquid inside the throttle enters from the top of the central tube 1 and is then discharged into the interior of the valve cover interface 2 through the drain port 18. When the pressure inside the valve cover interface 2 is greater than the pressure set by the compression spring 5, the valve 3 is pushed upward to separate the valve 3 from the valve cover interface 2, and the liquid is discharged from the top of the valve cover interface 2, reducing the pressure inside the central tube 1. The compression spring 5 is protected by the bellows 7, so that the spring 5 can work normally without affecting the normal use of the throttle.

[0024] When there is too much accumulated liquid above the throttle, the pressure in the liquid inlet 11 above the baffle 15 is greater than the pressure of the spring 14, and the telescopic rod 13 drives the baffle 15 to move downward. At the same time, the baffle 15 squeezes the spring 14, so that the upper end surface of the baffle 15 is separated from the internal top surface of the cavity 9, so that the accumulated liquid enters from the liquid inlet 11 and is then discharged through the drainage groove 10, reducing the accumulated liquid above the throttle, so that the pressure in the liquid inlet 11 above the baffle 15 is less than the pressure of the spring 14. The spring 14 squeezes the baffle 15, so that the telescopic rod 13 drives the baffle 15 to move upward, blocking the liquid inlet 11, which is convenient for discharging the accumulated liquid above the throttle and has strong practicality.

[0025] As a technical optimization solution of the present invention, the upper end surface of the adjusting ring 4 is fixedly connected with a threaded sleeve 8 , and the threaded sleeve 8 is threadedly connected to the fixing tube 6 .

[0026] In this embodiment, the threaded sleeve 8 is rotated to drive the adjusting ring 4 to move up and down on the outer wall of the central tube 1 , so as to facilitate adjustment of the pressure of the compression spring 5 .

[0027] As a technical optimization solution of the present invention, a sealing gasket 16 is fixedly connected to the upper end surface of the baffle 15 .

[0028] In this embodiment, a sealing gasket 16 is fixedly connected to the upper end surface of the baffle 15 to increase the airtightness of the baffle 15 .

[0029] As a technical optimization solution of the present invention, the lower end surface of the fixed cylinder 6 and the upper end surface of the valve 3 are both provided with a card slot 17, and the upper and lower ends of the bellows 7 are respectively clamped in the inside of the two card slots 17.

[0030] In this embodiment, the upper and lower ends of the bellows 7 are respectively clamped in the two clamping grooves 17 , so that the bellows 7 can be easily disassembled, assembled and replaced.

[0031] As a technical optimization solution of the present invention, the bellows 7 is made of rubber.

[0032] In this embodiment, the bellows 7 is made of rubber material, so that the bellows 7 can move along with the valve 3 without affecting the normal use of the compression spring 5 .

[0033] As a technical optimization solution of the present invention, the outer wall of the central tube 1 is provided with a plurality of drainage ports 18 located inside the valve cover interface 2 .

[0034] In this embodiment, the liquid in the central tube 1 enters the interior of the valve cover interface 2 through the liquid discharge port 18 .

[0035] The working principle and use process of the utility model are as follows: when in use, when the pressure inside the central tube 1 is too high, the liquid inside the throttle enters from the top of the central tube 1, and then is discharged into the interior of the valve cover interface 2 through the drain port 18. When the pressure inside the valve cover interface 2 is greater than the pressure set by the compression spring 5, the valve 3 is pushed upward to separate the valve 3 from the valve cover interface 2, and the liquid is discharged from the top of the valve cover interface 2, reducing the pressure inside the central tube 1;

[0036] By rotating the threaded sleeve 8, the threaded sleeve 8 drives the adjusting ring 4 to move up and down on the outer wall of the central tube 1, so as to facilitate the adjustment of the pressure of the compression spring 5. The upper and lower ends of the bellows 7 are respectively clamped in the two clamping grooves 17, so as to facilitate the disassembly, assembly and replacement of the bellows 7. The bellows 7 protects the compression spring 5, so that the spring 5 can work normally without affecting the normal use of the throttle.

[0037] When there is too much accumulated liquid above the throttle, the pressure in the liquid inlet 11 above the baffle 15 is greater than the pressure of the spring 14, and the telescopic rod 13 drives the baffle 15 to move downward. At the same time, the baffle 15 squeezes the spring 14, so that the upper end surface of the baffle 15 is separated from the internal top surface of the cavity 9, so that the accumulated liquid enters from the liquid inlet 11 and is then discharged through the drainage groove 10, reducing the accumulated liquid above the throttle, so that the pressure in the liquid inlet 11 above the baffle 15 is less than the pressure of the spring 14. The spring 14 squeezes the baffle 15, so that the telescopic rod 13 drives the baffle 15 to move upward, blocking the liquid inlet 11, which is convenient for discharging the accumulated liquid above the throttle and has strong practicality.

[0038] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic liquid-draining downhole choke for a gas well, comprising a central tube (1), a valve cover interface (2) being threadedly connected to the lower portion of the outer wall of the central tube (1), and a valve (3) being slidably connected to the outer wall of the central tube (1) and located above the valve cover interface (2), characterized in that: A fixed cylinder (6) is fixedly connected to the upper portion of the outer wall of the central tube (1), and a plurality of array-distributed liquid discharge mechanisms are provided inside the fixed cylinder (6), wherein the liquid discharge mechanism comprises a cavity (9) provided inside the fixed cylinder (6), and a liquid inlet (11) and a liquid discharge groove (10) communicating with the cavity (9) are provided on the upper and lower end surfaces of the fixed cylinder (6), respectively; a placement groove (12) is provided on the inner bottom surface of the cavity (9), and a telescopic rod (13) is provided inside the placement groove (12); the upper end surface of the telescopic rod (13) is fixedly connected to a baffle (15) located directly below the liquid inlet (11), and the outer wall of the telescopic rod (13) is provided with a spring (14) located between the baffle (15) and the bottom of the placement groove (12); The outer wall of the central tube (1) is slidably connected to an adjustment ring (4) located below the fixed tube (6); the outer wall of the central tube (1) is provided with a compression spring (5) located between the adjustment ring (4) and the valve (3); and a bellows (7) is provided between the fixed tube (6) and the valve (3).

2. The automatic liquid-draining downhole choke for a gas well according to claim 1, characterized in that: The upper end surface of the adjusting ring (4) is fixedly connected with a threaded sleeve (8), and the threaded sleeve (8) is threadedly connected to the fixing cylinder (6).

3. The automatic liquid-draining downhole choke for a gas well according to claim 1, characterized in that: A sealing gasket (16) is fixedly connected to the upper end surface of the baffle (15).

4. The automatic liquid-draining downhole choke for a gas well according to claim 1, characterized in that: The lower end surface of the fixed cylinder (6) and the upper end surface of the valve (3) are both provided with a clamping groove (17), and the upper and lower ends of the corrugated tube (7) are respectively clamped in the inside of the two clamping grooves (17).

5. The automatic liquid-draining downhole choke for a gas well according to claim 1, characterized in that: The bellows (7) is made of rubber.

6. The automatic liquid-draining downhole choke for a gas well according to claim 1, characterized in that: The outer wall of the central tube (1) is provided with a plurality of liquid discharge ports (18) located inside the valve cover interface (2).

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