Multilayer pump for coal bed gas drainage and production

Abstract

The utility model discloses a multilayer pump for coal bed gas drainage, which comprises a working barrel, one end of the working barrel is provided with a sealing seat, the top end of the sealing seat is provided with a tail end main body, a flow suction cavity is arranged between the sealing seat and the tail end main body, and the top end of the tail end main body is connected with a first series main body; according to the multi-layer pump for discharging and adopting the coal bed gas, the multi-layer pump adopts multi-stage jet injection, consists of a multi-stage nozzle, a suction chamber, a mixing chamber, a diffusion part and the like, and is free of moving parts and shaft seals, so that the multi-layer pump is more convenient to repair and maintain, the operation cost is reduced, the multi-layer pump can smoothly pass through inflection points, and the service life of the multi-layer pump is prolonged. The device has the advantages that the device can carry pulverized coal and tiny particles well, pump clamping is avoided, eccentric wear is avoided, the pump inspection period is long, maintenance is simple, stability is good, the pump inspection and well repair period and production and recovery benefits can be improved, multiple sections of serially-connected main bodies can be added according to working condition requirements, and the working efficiency is optimal.

Description

Technical Field

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

[0002] The working principle of the jet pump is based on the entrainment and mixing effect of the jet. The jet pump mainly consists of three parts: a nozzle, a suction chamber, and a diffuser. During operation, a working fluid with a relatively high pressure is ejected at high speed through the nozzle to form a high-speed jet. Due to the turbulent diffusion effect of the jet boundary layer, the jet exchanges momentum with the surrounding static fluid, driving the surrounding fluid to move forward, thereby generating a negative pressure in the suction chamber. Under the action of the negative pressure, the pumped fluid is sucked into the suction chamber and mixed with the working fluid. The mixed fluid enters the diffuser, where the speed gradually decreases and the pressure gradually increases, and finally it is discharged from the jet pump. In the middle and late stages of the jet pump's drainage of coalbed methane horizontal wells, coal powder becomes increasingly prominent, making it easy for coalbed methane wells to become clogged with coal powder, the pump to become stuck, the pump inspection cycle to become short, and the gas volume to decay.

[0003] In order to solve the above problems, a multi-layer pump for coalbed methane drainage is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide a multi-layer pump for coalbed methane drainage to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a multi-layer pump for coalbed methane drainage, comprising a working barrel, a sealing seat is provided at one end of the working barrel, an end body is provided at the top of the sealing seat, a suction cavity is provided between the sealing seat and the end body, the top of the end body is connected to a first series body, a second series body is provided at the top of the first series body, a sleeve coupling is provided at the top of the second series body, a throttling nozzle seat is provided at the top of the sleeve coupling, the end body, the first series body, the second series body, the sleeve coupling and the throttling nozzle seat are all arranged inside the working barrel, a center hole is provided in the middle of the first series body, the middle of the second series body and the middle of the sleeve coupling, a threaded hole is provided at one end of the inner side of the three center holes, a throat is threadedly provided inside the three threaded holes, and a nozzle is provided inside the three center holes.

[0006] The multi-layer pump is a multi-stage jet injection pump, which consists of a multi-stage nozzle, a suction chamber, a mixing chamber diffusion and other parts. It has no moving parts and does not require a shaft seal. Therefore, it is relatively convenient in terms of repair and maintenance, reducing operating costs, and can smoothly pass through the inflection point and enter the horizontal section where it is blocked for circulation cleaning or direct production and drainage. It has a good carrying effect on coal powder and tiny particles, is not afraid of pump jamming, no eccentric wear, a long pump inspection cycle, simple maintenance, good stability, and can improve the pump inspection and well repair cycle and production efficiency. The multi-layer pump has a large adjustment range for the drainage water volume, and can be adjusted arbitrarily within the range of 0.1-100 cubic meters. If the pump needs to be inspected, the construction is simple. When the oil pipe is intact and there is no leakage, only the hollow sucker rod and pump core need to be removed. There is no need to use the entire pipe string. It is simple and convenient, and multiple sections of series main body can be added according to the working conditions to achieve the best work efficiency.

[0007] Preferably, a connecting slot is provided at the connection between the first series body and the second series body, and at the connection between the second series body and the sleeve coupling. A connecting seat is provided inside the two connecting slots. The two connecting seats are fixedly connected to the second series body and the sleeve coupling respectively. The first series body and the second series body and the second series body and the sleeve coupling are conveniently connected through the limiting engagement of the two connecting seats with the two connecting slots.

[0008] Preferably, a first sealing groove is provided at the connection between the sealing seat and the suction cavity, and a first sealing ring is fixedly provided inside the first sealing groove. The provision of the first sealing ring can improve the sealing performance of the connection between the sealing seat and the suction cavity.

[0009] Preferably, a mounting groove is provided at one end of the sealing seat away from the working barrel, a connecting seat is provided inside the mounting groove, one end of the connecting seat is fixedly connected to an oil pipe, and the matching arrangement of the mounting groove and the connecting seat facilitates the installation of the oil pipe.

[0010] Preferably, second sealing grooves are respectively provided at the connections between the three threaded holes and the three throats, and second sealing rings are fixedly provided inside the three second sealing grooves. The provision of the second sealing rings can improve the overall sealing performance.

[0011] Preferably, four first power fluid flow channels are opened on the outside of one end of the sleeve coupling, and two well fluid suction channels and two second power fluid flow channels are opened on the outside of one end of the second series body. When the high-pressure power fluid injected from the ground passes through the oil pipe to the nozzle and the second power fluid flow channel, a high-speed low-pressure fluid jet is formed at the nozzle, and a negative pressure is formed between the nozzle and the throat. The downhole liquid is sucked into the negative pressure area through the well fluid suction channel and enters the throat for mixing and diffusion, and then enters the annulus through the water outlet and is lifted to the ground.

[0012] Preferably, auxiliary grooves are provided on both sides of the surface of the sealing seat, and the provision of the two auxiliary grooves facilitates the disassembly and assembly of the sealing seat.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The multi-layer pump is a multi-stage jet injection pump, which consists of a multi-stage nozzle, a suction chamber, a mixing chamber diffusion and other parts. It has no moving parts and does not require a shaft seal. Therefore, it is relatively convenient in terms of repair and maintenance, reducing operating costs, and can smoothly pass through the inflection point and enter the horizontal section where it is blocked for circulation cleaning or direct production and drainage. It has a good carrying effect on coal powder and tiny particles, is not afraid of pump jamming, no eccentric wear, a long pump inspection cycle, simple maintenance, good stability, and can improve the pump inspection and well repair cycle and production efficiency. The multi-layer pump has a large adjustment range for the drainage water volume, and can be adjusted arbitrarily within the range of 0.1-100 cubic meters. If the pump needs to be inspected, the construction is simple. When the oil pipe is intact and there is no leakage, only the hollow sucker rod and pump core need to be removed. There is no need to use the entire pipe string. It is simple and convenient, and multiple sections of series main body can be added according to the working conditions to achieve the best work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 It is a front sectional view of the utility model;

[0017] Figure 3 It is an enlarged view of part A of the present utility model;

[0018] Figure 4 It is a cross-sectional view of the sleeve coupling of the present invention;

[0019] Figure 5 It is a cross-sectional view of the second series main body of the utility model.

[0020] In the figure: 1. working barrel; 2. sealing seat; 3. suction cavity; 4. first sealing groove; 5. first sealing ring; 6. end body; 7. first series body; 8. second series body; 9. sleeve coupling; 10. throttling nozzle seat; 11. mounting groove; 12. connecting seat; 13. oil pipe; 14. connecting card seat; 15. connecting card groove; 16. center hole; 17. threaded hole; 18. throat; 19. second sealing groove; 20. second sealing ring; 21. nozzle; 22. first power fluid flow channel; 23. well fluid suction channel; 24. second power fluid flow channel; 25. auxiliary groove. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] See also Figure 1-5 The utility model provides a multi-layer pump for coalbed methane drainage, including a working barrel 1, a sealing seat 2 is provided at one end of the working barrel 1, a terminal body 6 is provided at the top of the sealing seat 2, a suction cavity 3 is provided between the sealing seat 2 and the terminal body 6, the top of the terminal body 6 is connected with a first series body 7, the top of the first series body 7 is provided with a second series body 8, the top of the second series body 8 is provided with a sleeve coupling 9, and the top of the sleeve coupling 9 is provided with a throttling nozzle seat 10, the terminal body 6, the first series body 7, the second series body 8, the sleeve coupling 9 and the throttling nozzle seat 10 are all arranged inside the working barrel 1, and a center hole 16 is provided in the middle of the first series body 7, the middle of the second series body 8 and the middle of the sleeve coupling 9, and a threaded hole 17 is provided at one end of the inner side of the three center holes 16. A throat 18 is threadedly provided inside the three threaded holes 17. A nozzle 21 is provided inside each center hole 16. The multi-layer pump is a multi-stage jet injection, consisting of a multi-stage nozzle 21, a suction chamber, a mixing chamber diffusion and other parts. It has no moving parts and does not require a shaft seal. Therefore, it is relatively convenient in terms of repair and maintenance, reduces operating costs, and can smoothly pass through the inflection point and enter the horizontal section blockage for circulation cleaning or direct production and drainage. It has a good carrying effect on coal powder and tiny particles, is not afraid of pump jamming, no uneven wear, a long pump inspection cycle, simple maintenance, good stability, and can improve the pump inspection and well repair cycle and production efficiency. The multi-layer pump has a large adjustment range for the drainage water volume, and can be adjusted arbitrarily within the range of 0.1-100 cubic meters. If the pump needs to be inspected, the construction is simple. When the oil pipe 13 is intact and not leaking, it is only necessary to remove the hollow sucker rod and pump core. There is no need to use the entire pipe string. It is simple and convenient, and multiple sections of series main bodies can be added according to working conditions to achieve optimal work efficiency.

[0023] A connecting groove 15 is provided at the connection between the first series body 7 and the second series body 8 and at the connection between the second series body 8 and the sleeve coupling 9. A connecting card seat 14 is provided inside the two connecting card slots 15. The two connecting card seats 14 are fixedly connected to the second series body 8 and the sleeve coupling 9 respectively. A first sealing groove 4 is provided at the connection between the sealing seat 2 and the suction cavity 3. A first sealing ring 5 is fixedly provided inside the first sealing groove 4. A mounting groove 11 is provided at the end of the sealing seat 2 away from the working barrel 1. A connecting seat 12 is provided inside the mounting groove 11. One end of the connecting seat 12 is fixedly connected to the oil pipe 13.

[0024] When in use, the first series body 7 is conveniently connected to the second series body 8 and the second series body 8 is conveniently connected to the sleeve coupling 9 through the limited engagement of the two connecting clamping seats 14 and the two connecting clamping grooves 15. The setting of the first sealing ring 5 can improve the sealing performance of the connection between the sealing seat 2 and the suction cavity 3. The matching setting of the mounting groove 11 and the connecting seat 12 facilitates the installation of the oil pipe 13.

[0025] Second sealing grooves 19 are formed at the connection points between the three threaded holes 17 and the three throats 18. Second sealing rings 20 are fixedly installed inside the three second sealing grooves 19. Four first power fluid flow channels 22 are formed on the outside of one end of the sleeve coupling 9. Two well fluid suction channels 23 and two second power fluid flow channels 24 are formed on the outside of one end of the second series body 8. Auxiliary grooves 25 are formed on both sides of the surface of the sealing seat 2.

[0026] When in use, the setting of the second sealing ring 20 can improve the overall sealing performance. When the high-pressure power liquid injected from the ground passes through the oil pipe 13 to the nozzle 21 and the second power liquid flow channel 24, a high-speed low-pressure fluid jet is formed at the nozzle 21, and a negative pressure is formed between the nozzle 21 and the throat 18. The downhole liquid is sucked into the negative pressure area through the well fluid suction channel 23 and enters the throat 18 for mixing and diffusion, and then enters the annulus through the water outlet and is lifted to the ground. The setting of the two auxiliary grooves 25 can facilitate the disassembly and assembly of the sealing seat 2.

[0027] When the embodiment of the present application is in use: the multi-layer pump is a multi-stage jet injection, consisting of a multi-stage nozzle 21, a suction chamber, a mixing chamber diffusion and other parts, without moving parts and no shaft seal, so it is relatively convenient in terms of repair and maintenance, reducing operating costs, and can smoothly pass through the inflection point and enter the horizontal section blockage for circulation cleaning or direct production and drainage, and has a good carrying effect on coal powder and tiny particles, is not afraid of pump jamming, no partial wear, long pump inspection cycle, simple maintenance, good stability, can improve the pump inspection and well repair cycle and production efficiency, the multi-layer pump has a large adjustment range of drainage water volume, within the range of 0.1-100 cubic meters or more It can be adjusted at will. For example, when the pump needs to be inspected, the construction is simple. When the oil pipe 13 is intact and leak-free, it is only necessary to pull out the hollow sucker rod and the pump core. There is no need to use the entire pipe string. It is simple and convenient, and multiple sections of the main body can be added in series according to the working conditions to optimize the working efficiency. The high-pressure power liquid injected from the ground passes through the oil pipe 13 to the nozzle 21 and the second power liquid flow channel 24. A high-speed low-pressure fluid jet is formed at the nozzle 21, and a negative pressure is formed between the nozzle 21 and the throat 18. The downhole liquid is sucked into the negative pressure area through the well fluid suction channel 23 and enters the throat 18 for mixing and diffusion. It then enters the annulus through the water outlet and is lifted to the ground.

[0028] 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 multi-layer pump for coalbed methane drainage, comprising a working barrel (1), characterized in that: One end of the working barrel (1) is provided with a sealing seat (2), the top of the sealing seat (2) is provided with a terminal body (6), a suction cavity (3) is provided between the sealing seat (2) and the terminal body (6), the top of the terminal body (6) is connected to a first series body (7), the top of the first series body (7) is provided with a second series body (8), the top of the second series body (8) is provided with a sleeve coupling (9), the top of the sleeve coupling (9) is provided with a throttling nozzle seat (10), the terminal body (6) ), a first serial body (7), a second serial body (8), a sleeve coupling (9) and a throttling nozzle seat (10) are all arranged inside the working barrel (1), a center hole (16) is opened in the middle of the first serial body (7), the middle of the second serial body (8) and the middle of the sleeve coupling (9), a threaded hole (17) is opened at one end of the inner side of the three center holes (16), a throat (18) is threadedly arranged inside the three threaded holes (17), and a nozzle (21) is arranged inside the three center holes (16).

2. The multi-layer pump for coalbed methane drainage according to claim 1, characterized in that: A connection slot (15) is provided at the connection point between the first series main body (7) and the second series main body (8), and at the connection point between the second series main body (8) and the sleeve coupling (9). A connection seat (14) is provided inside the two connection slots (15). The two connection seats (14) are fixedly connected to the second series main body (8) and the sleeve coupling (9), respectively.

3. The multi-layer pump for coalbed methane drainage according to claim 1, characterized in that: A first sealing groove (4) is provided at the connection between the sealing seat (2) and the suction cavity (3), and a first sealing ring (5) is fixedly provided inside the first sealing groove (4).

4. The multi-layer pump for coalbed methane drainage according to claim 1, characterized in that: An installation groove (11) is provided at one end of the sealing seat (2) away from the working barrel (1), a connecting seat (12) is provided inside the installation groove (11), and one end of the connecting seat (12) is fixedly connected to an oil pipe (13).

5. The multi-layer pump for coalbed methane drainage according to claim 1, characterized in that: Second sealing grooves (19) are respectively provided at the connection points between the three threaded holes (17) and the three throats (18), and second sealing rings (20) are fixedly provided inside the three second sealing grooves (19).

6. The multi-layer pump for coalbed methane drainage according to claim 1, characterized in that: Four first power fluid flow channels (22) are provided on the outside of one end of the sleeve coupling (9), and two well fluid suction channels (23) and two second power fluid flow channels (24) are provided on the outside of one end of the second series main body (8).

7. The multi-layer pump for coalbed methane drainage according to claim 1, characterized in that: Auxiliary grooves (25) are provided on both sides of the surface of the sealing seat (2).

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