Jet pump for coal bed gas drainage and mining

Abstract

The utility model relates to the field of coal bed gas drainage, in particular to a jet pump for coal bed gas drainage, which comprises an external main body oil pipe, a nozzle seat, a connecting pipe, a flow suction rod and a jet pump main body, a nozzle body is arranged in the nozzle seat, and liquid injected from the top can be sprayed to the jet pump main body to play a role in throttling. The bottom of the nozzle seat is connected with the top of the jet pump body through a sleeve coupling, the nozzle body generates high-flow-speed liquid jet under the throttling effect, a low-pressure negative-pressure area is generated between the nozzle body and the throat pipe, and liquid in a well can be conveniently sucked into the pump body. The throat pipe is mainly used for controlling the water yield of underground liquid carried by the jet pump, the power liquid and the underground sucked liquid are mixed and then enter the annulus through the main body throat pipe, the bottom of the throat pipe is connected with a diffusion pipe, and after entering the throat pipe, the mixed liquid is gradually diffused through the straight cone type diffusion pipe to enter the annulus and is lifted to a ground water tank.

Description

Technical Field

[0001] The utility model relates to the field of coalbed methane drainage, in particular to a jet pump used for coalbed methane drainage. Background Art

[0002] With the large-scale exploitation of clean energy coalbed methane, coal powder becomes more and more prominent in the middle and late stages of coalbed methane horizontal well drainage. The jet pump has the function of negative pressure extraction, which can make up for the defect of shallow water level to a certain extent. It has strong medium permeability and does not destroy the original dynamic balance.

[0003] However, the prior art has the following defects:

[0004] With the large-scale exploitation of clean energy coalbed methane, coal powder becomes increasingly prominent in the middle and late stages of coalbed methane horizontal well production. The existing production and production equipment cannot solve the problems of excessive coal powder in coalbed methane wells and serious blockage leading to gas volume attenuation, liquid level reduction, insufficient formation fluid supply, and severe sand spitting. In addition, the existing jet pump has a complex structure and is difficult to repair and maintain. Utility Model Content

[0005] The purpose of the utility model is to provide a jet pump for coalbed methane drainage to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a jet pump for coalbed methane drainage, comprising an external main body oil pipe, a nozzle seat, a connecting pipe, a suction rod and a jet pump body, the nozzle seat is inserted into the inner side of the top of the external main body oil pipe and the outer wall of the top of the nozzle seat is fixedly connected to the inner wall of the top of the external main body oil pipe, the bottom of the nozzle seat is fixedly connected to the top of the jet pump body through a sleeve coupling, the jet pump body is snap-fitted and installed on the inner side of the middle part of the external main body oil pipe, the bottom of the external main body oil pipe is fixedly connected to the top of the connecting pipe, the bottom of the jet pump body is fixedly installed with a suction rod, and the middle part of the bottom of the connecting pipe is fixedly installed with a second filter.

[0007] The above technical solution is adopted, in which a nozzle is provided in the nozzle seat, which plays a throttling role, and the second filter plays a filtering role.

[0008] A suction cavity is provided inside the suction rod, the second filter screen is cylindrical and has a number of filter holes evenly distributed around it, a nozzle body is fixedly installed inside the nozzle seat, a water inlet pipe interface is provided on the top of the nozzle seat and a nozzle is provided in the middle of the bottom.

[0009] With the above technical solution, the nozzle body of the solution converts the pressure energy of the working fluid into kinetic energy to form a high-speed jet.

[0010] The inside of the nozzle body is provided with a first filter screen and a diverter valve in sequence from top to bottom. The top of the sleeve coupling is connected to the nozzle seat, and the bottom thereof is connected to the top of the jet pump body. The inside of the jet pump body is provided with an oil pump body, and the inside of the upper half of the oil pump body is provided with a throat and a diffuser in sequence.

[0011] The above technical solution forms a negative pressure zone inside the middle part of the sleeve coupling, which can suck the liquid in the well into the pump body. The bottom of the throat pipe and the top of the diffuser are connected. The function of the diffuser is to convert the kinetic energy of the mixed fluid into pressure energy to achieve the purpose of pressurization.

[0012] The bottom of the diffuser is connected to a water inlet guide valve, a one-way valve ball is mounted in the middle of the top of the suction rod, a one-way valve spring pressure plate is fixed to the top of the one-way valve ball through a one-way valve spring, and the top of the suction rod is plugged into the bottom of the oil pump body.

[0013] By adopting the above technical solution, the liquid circulates in one direction from bottom to top inside the suction rod, and the one-way valve ball can play a one-way circulation role to prevent the liquid from flowing back.

[0014] A connecting hole is provided in the middle of the top of the connecting tube, a limiting cone is provided on the outer side of the top of the suction rod and the limiting cone is inserted into the connecting hole, a sealing ring is clamped and installed between the limiting cone and the connecting hole, and a liquid suction column is provided inside the limiting cone.

[0015] By adopting the above technical solution, the downhole liquid is sucked into the negative pressure mixing zone through the suction cavity flow channel and enters the main flow channel.

[0016] A one-way valve body is fixedly installed at the bottom of the connecting pipe, a one-way valve plate is fixedly installed in the middle of the top of the one-way valve body, and the bottom of the suction rod is clamped and installed in the middle of the top of the one-way valve plate. A one-way valve column is provided at the bottom of the one-way valve body and the one-way valve column is located on the inner side of the top of the second filter screen.

[0017] With the above technical solution, the one-way valve body is inserted into the well body along with the jet pump and is located at the bottom of the well body, sucking the liquid in the well into the pump body.

[0018] A connecting column is provided on the top of the connecting pipe, and a concave structure is provided on the inner side of the bottom of the external main body oil pipe, and the connecting column is clamped and installed inside the concave structure.

[0019] By adopting the above technical solution, the bottom of the external main body oil pipe and the top of the connecting pipe are fixedly connected after being snap-fitted and installed.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The utility model can smoothly pass through the inflection point and enter the blocked area of ​​the horizontal section for circulation cleaning or direct production and drainage. The jet pump of this technology has a good carrying effect on coal powder and tiny particles, is not afraid of pump jamming, does not suffer from uneven wear, has a long pump inspection cycle, is simple to maintain, and has good stability, which greatly improves the pump inspection and well repair cycle and production efficiency, and the technical structure is simple, so it is more convenient in repair and maintenance, and reduces operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the connection structure of the jet pump body and the connecting pipe of the utility model;

[0024] Figure 3 This is a schematic diagram of the connection structure between the nozzle holder and the throat pipe of the utility model;

[0025] Figure 4 This is a schematic structural diagram of the flow suction rod of the present utility model;

[0026] Figure 5 This is a schematic cross-sectional structural diagram of the nozzle holder of the present invention.

[0027] In the figure: 1. External main oil pipe; 2. Nozzle seat; 3. First filter; 4. Diverter valve; 5. Oil pump body; 6. Throat; 7. Diffuser; 8. Water inlet guide valve; 9. One-way valve spring pressure plate; 10. One-way valve spring; 11. One-way valve ball; 12. Suction column; 13. Sealing ring; 14. Limiting cone; 15. Connecting pipe; 16. One-way valve plate; 17. One-way valve body; 18. One-way valve column; 19. Second filter; 20. Suction rod; 21. Jet pump body; 22. Sleeve coupling; 23. Nozzle body. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1-5The utility model provides a jet pump for coalbed methane drainage, including an external main body oil pipe 1, a nozzle seat 2, a connecting pipe 15, a suction rod 20 and a jet pump main body 21. The nozzle seat 2 is inserted into the inner side of the top of the external main body oil pipe 1 and the outer wall of the top of the nozzle seat 2 is fixedly connected to the inner wall of the top of the external main body oil pipe 1. The bottom of the nozzle seat 2 is fixedly connected to the top of the jet pump main body 21 through a sleeve coupling 22. The jet pump main body 21 is snap-fitted and installed on the inner side of the middle part of the external main body oil pipe 1. The bottom of the external main body oil pipe 1 is fixedly connected to the top of the connecting pipe 15. The suction rod 20 is fixedly installed at the bottom of the jet pump main body 21. The middle part of the bottom of the connecting pipe 15 is fixedly installed with a second filter screen 19. The external main body oil pipe 1 is sleeved on the outside of the nozzle seat 2 and the jet pump main body 21.

[0030] A suction cavity is provided inside the suction rod 20, the second filter screen 19 is cylindrical and has a number of filter holes evenly distributed around it, a nozzle body 23 is fixedly installed inside the nozzle holder 2, a water inlet pipe interface is provided at the top of the nozzle holder 2 and a nozzle is provided in the middle of the bottom, and water enters the top of the nozzle body 23 and sprays water at the bottom.

[0031] The inside of the nozzle body 23 is provided with a first filter 3 and a diverter valve 4 from top to bottom. The top of the sleeve coupling 22 is connected to the nozzle seat 2, and its bottom is connected to the top of the jet pump body 21. The inside of the jet pump body 21 is provided with an oil pump body 5. The interior of the upper half of the oil pump body 5 is provided with a throat 6 and a diffuser 7 in sequence. The outside of the bottom of the throat 6 is provided with an external thread, which is threadedly connected to the middle mounting hole at the top of the oil pump body 5.

[0032] The bottom of the diffusion tube 7 is connected to the water inlet guide valve 8, and a one-way valve ball 11 is installed in the middle of the top of the suction rod 20. The top of the one-way valve ball 11 is fixedly installed with a one-way valve spring pressure plate 9 through a one-way valve spring 10. The top of the suction rod 20 is inserted into the bottom of the oil pump body 5, and the one-way valve ball 11 prevents the liquid in the suction rod 20 from flowing back.

[0033] A connecting hole is provided in the middle of the top of the connecting tube 15, a limiting cone 14 is provided on the outside of the top of the suction rod 20, and the limiting cone 14 is inserted into the connecting hole, a sealing ring 13 is installed between the limiting cone 14 and the connecting hole, a liquid suction column 12 is provided inside the limiting cone 14, and the bottom of the connecting hole is conical and corresponds to the limiting cone 14, which plays a limiting role.

[0034] A one-way valve body 17 is fixedly installed at the bottom of the connecting pipe 15, a one-way valve plate 16 is fixedly installed in the middle of the top of the one-way valve body 17, and the bottom of the suction rod 20 is clamped and installed in the middle of the top of the one-way valve plate 16. A one-way valve column 18 is provided at the bottom of the one-way valve body 17, and the one-way valve column 18 is located on the inner side of the top of the second filter screen 19. The one-way valve body 17 can suck the liquid inside the well body into the pump body.

[0035] A connecting column is provided on the top of the connecting pipe 15 , and a concave structure is provided on the inner side of the bottom of the external main oil pipe 1 , and the connecting column is snap-fitted and installed inside the concave structure. Sealing gaskets are bonded to the outer sides of both ends of the connecting pipe 15 .

[0036] Working principle: The utility model utilizes a ground injection pump to inject high-pressure liquid, and transmits the high-pressure liquid to the jet pump nozzle body 23 through a hollow pumping pipe. Under the throttling action of the nozzle body 23, a high-flow rate liquid jet is generated, and a low-pressure negative pressure area is generated between the nozzle body 23 and the throat 6. The liquid in the well is sucked into the pump through the suction rod 20, mixed at the lower part of the manifold, and then returned to the ground wellhead through the annulus between the oil pipe and the hollow pumping pipe, and enters the ground sedimentation water tank. The coal powder is settled at the bottom of the water tank through the sedimentation tank and discharged into the sewage pool regularly. A part of the settled and filtered water is injected into the well through the injection pump to provide power fluid, and the excess water is discharged into the water reservoir.

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A jet pump for coalbed methane drainage, comprising an external main body oil pipe (1), a nozzle seat (2), a connecting pipe (15), a suction rod (20) and a jet pump body (21), characterized in that: The nozzle seat (2) is inserted into the inner side of the top of the external main body oil pipe (1) and the outer wall of the top of the nozzle seat (2) is fixedly connected to the inner wall of the top of the external main body oil pipe (1). The bottom of the nozzle seat (2) is fixedly connected to the top of the jet pump body (21) through a sleeve coupling (22). The jet pump body (21) is snap-fitted and installed on the inner side of the middle part of the external main body oil pipe (1). The bottom of the external main body oil pipe (1) is fixedly connected to the top of the connecting pipe (15). A suction rod (20) is fixedly installed at the bottom of the jet pump body (21), and a second filter (19) is fixedly installed at the middle part of the bottom of the connecting pipe (15).

2. A jet pump for coalbed methane extraction according to claim 1, characterized in that: A suction cavity is provided inside the suction rod (20), the second filter screen (19) is cylindrical and has a plurality of filter holes evenly distributed around it, a nozzle body (23) is fixedly installed inside the nozzle holder (2), a water inlet pipe interface is provided at the top of the nozzle holder (2), and a nozzle is provided in the middle of the bottom.

3. The jet pump for coalbed methane extraction according to claim 2, characterized in that: The nozzle body (23) is provided with a first filter (3) and a diverter valve (4) in sequence from top to bottom. The top of the sleeve coupling (22) is connected to the nozzle seat (2), and the bottom thereof is connected to the top of the jet pump body (21). The jet pump body (21) is provided with an oil pump body (5) in its interior. The upper half of the oil pump body (5) is provided with a throat (6) and a diffuser (7) in sequence.

4. The jet pump for coalbed methane extraction according to claim 3, characterized in that: The bottom of the diffusion tube (7) is connected to a water inlet guide valve (8), a one-way valve ball (11) is mounted in the middle of the top of the suction rod (20), a one-way valve spring pressure plate (9) is fixedly mounted on the top of the one-way valve ball (11) via a one-way valve spring (10), and the top of the suction rod (20) is plugged into the bottom of the oil pump body (5).

5. The jet pump for coalbed methane extraction according to claim 4, characterized in that: A connecting hole is provided in the middle of the top of the connecting tube (15), a limiting cone (14) is provided on the outer side of the top of the suction rod (20), and the limiting cone (14) is inserted into the connecting hole, a sealing ring (13) is mounted between the limiting cone (14) and the connecting hole, and a liquid suction column (12) is provided inside the limiting cone (14).

6. The jet pump for coalbed methane extraction according to claim 5, characterized in that: A one-way valve body (17) is fixedly installed at the bottom of the connecting pipe (15), a one-way valve plate (16) is fixedly installed in the middle of the top of the one-way valve body (17), and the bottom of the suction rod (20) is clamped and installed in the middle of the top of the one-way valve plate (16), and a one-way valve column (18) is provided at the bottom of the one-way valve body (17), and the one-way valve column (18) is located on the inner side of the top of the second filter (19).

7. The jet pump for coalbed methane extraction according to claim 1, characterized in that: A connecting column is provided on the top of the connecting pipe (15), and a concave structure is provided on the inner side of the bottom of the external main body oil pipe (1), and the connecting column is snap-fitted and installed inside the concave structure.

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