Well washing impeller pump for coal-bed gas well

Abstract

The utility model discloses a well washing impeller pump for a coal-bed gas well, which comprises a first main body, a lengthened diffusion main body is arranged at the top of the inner side of the first main body, and the well washing impeller pump for the coal-bed gas well is communicated with an oil pipe connecting hoop through a hollow oil pumping pipe by utilizing a ground injection pump or injecting high-pressure large-displacement liquid. Power liquid is transmitted to the internal nozzle and the power-driven impeller, high-flow-speed liquid injection is generated under the throttling action of the nozzle, a low-pressure negative-pressure area is generated between the nozzle and the throat pipe, and meanwhile the power-driven impeller is driven to rotate to suck different media of liquid in a well into a pump cavity; after being mixed at the throat pipe, the pulverized coal is lifted to a ground filtering water tank through a hollow oil pumping pipe, the pulverized coal is settled at the bottom of the water tank through the filtering water tank and discharged into a sewage pool regularly, a part of settled and filtered water is injected into a well through an injection pump or a pump truck to provide power liquid, and redundant water is discharged into a water storage pool.

Description

Technical Field

[0001] The utility model relates to the field of well-washing jet pumps, in particular to a coalbed methane well-washing impeller pump. Background Art

[0002] The well-washing jet pump has a negative pressure extraction effect, 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. However, the existing coalbed methane well-washing impeller pump may encounter problems such as coal dust clogging, large coal dust, severe sand spitting, pump sticking, short pump inspection cycle, and gas volume attenuation during use.

[0003] In order to solve the above problems, a coalbed methane well flushing impeller pump is proposed. Utility Model Content

[0004] The purpose of the utility model is to provide a coalbed methane well flushing impeller pump to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a coalbed methane well washing impeller pump, comprising a first main body, an extended diffusion body is provided at the top of the inner side of the first main body, an oil pipe connecting hoop is provided on the surface of the extended diffusion body, a throat is provided in the middle of the bottom end of the extended diffusion body, a secondary pressurization nozzle is provided at the connection between the first main body and the throat, a second main body is provided at the bottom end of the first main body, a filter screen is fixedly provided on the top end of the second main body, a second bearing is provided in the middle part of the inner side of the second main body, a transmission shaft is rotatably provided at the middle part of the second bearing, the top end of the transmission shaft extends to the interior of the first main body and is fixedly connected to a power drive impeller, a primary nozzle sleeve is provided at the connection between the first main body and the power drive impeller, a primary nozzle is fixedly provided on the top end of the primary nozzle sleeve, a mud suction impeller is fixedly provided in the middle part of the surface of the transmission shaft, the bottom end of the transmission shaft extends to the interior of the filter screen and is fixedly connected to a mud stirring wheel, and a one-way valve assembly is fixedly provided at the bottom of the inner side of the second main body.

[0006] The well-washing impeller pump uses a surface injection pump or injects high-pressure and large-displacement liquid, which is connected to the oil pipe connecting hoop through a hollow pumping pipe, and transmits the power liquid to the internal nozzle and the power-driven impeller. Under the throttling action of the nozzle, a high-flow liquid jet is generated, and a low-pressure negative pressure area is generated between the nozzle and the throat. At the same time, it drives the power-driven impeller to rotate and suck different media in the well liquid into the pump chamber. After mixing in the throat, it is lifted to the ground filter water tank through the hollow pumping pipe. The coal powder is settled at the bottom of the water tank through the filter water tank and discharged into the sewage pool regularly. Part of the settled and filtered water is injected into the well through an injection pump or a pump truck to provide power liquid, and the excess water is discharged into the water reservoir. The well-washing impeller pump can smoothly pass through the inflection point and enter the horizontal section blockage for circulation and promotion cleaning. It has good passability and carrying capacity for coal powder and particles smaller than 6 mm, is not afraid of pump jamming and non-uniform wear, which greatly improves the well-washing efficiency, can well clear the blockage problem of the coalbed methane horizontal section, and helps to improve the coalbed methane recovery rate.

[0007] Preferably, a connecting seat is fixedly provided in the middle of the bottom end of the filter screen cover, and a connecting pipe is fixedly connected to the bottom end of the connecting seat. Water spray pipes are fixedly connected to both sides of the connecting seat. The top ends of the two water spray pipes are respectively connected to the two power fluid flow channels of the second main body. The different media (mud, coal powder, fracturing sand) in the well are disturbed by spraying through the water spray pipes, so that the mud stirring wheel and the mud suction impeller can better stir and suck.

[0008] Preferably, a bearing cover plate is provided at the connection between the second main body and the second bearing, and the bearing cover plate is arranged corresponding to the second bearing. The arrangement of the bearing cover plate can prevent the second bearing from falling off due to high-speed rotation.

[0009] Preferably, a mounting groove is provided at the connection between the second body and the first body, a first bearing is fixedly provided inside the mounting groove, and the first bearing is arranged corresponding to the transmission shaft. The arrangement of the first bearing facilitates the stable operation of the transmission shaft.

[0010] Preferably, a flat gasket seal and a tapered seal are provided at the connection between the extended diffuser body and the oil pipe connecting hoop, and the cooperation of the flat gasket seal and the tapered seal can achieve a high-pressure sealing effect.

[0011] Preferably, a water inlet filter is provided at the bottom of the surface of the elongated diffuser body, and the setting of the water inlet filter can play a role in filtering the annular space power fluid.

[0012] Preferably, a mud sealing ring is fixedly provided in the middle portion of the inner side of the second main body, and the mud sealing ring can play a sealing role.

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

[0014] The well-washing impeller pump uses a surface injection pump or injects high-pressure and large-displacement liquid, which is connected to the oil pipe connecting hoop through a hollow pumping pipe, and transmits the power liquid to the internal nozzle and the power-driven impeller. Under the throttling action of the nozzle, a high-flow liquid jet is generated, and a low-pressure negative pressure area is generated between the nozzle and the throat. At the same time, it drives the power-driven impeller to rotate and suck different media in the well liquid into the pump chamber. After mixing in the throat, it is lifted to the ground filter water tank through the hollow pumping pipe. The coal powder is settled at the bottom of the water tank through the filter water tank and discharged into the sewage pool regularly. Part of the settled and filtered water is injected into the well through an injection pump or a pump truck to provide power liquid, and the excess water is discharged into the water reservoir. The well-washing impeller pump can smoothly pass through the inflection point and enter the horizontal section blockage for circulation and promotion cleaning. It has good passability and carrying capacity for coal powder and particles smaller than 6 mm, is not afraid of pump jamming and non-uniform wear, which greatly improves the well-washing efficiency, can well clear the blockage problem of the coalbed methane horizontal section, and helps to improve the coalbed methane recovery rate. 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 a first stereoscopic view of a part of the utility model;

[0018] Figure 4 This is a second perspective view of a portion of the present invention.

[0019] In the figure: 1. Oil pipe connecting clamp; 2. Extended diffuser body; 3. Tapered seal; 4. Flat washer seal; 5. First body; 6. Water inlet filter; 7. Throat; 8. Secondary pressure nozzle; 9. Primary nozzle; 10. Primary nozzle sleeve; 11. Power drive impeller; 12. Drive shaft; 13. Bearing cover; 14. Mud suction impeller; 15. Mud seal; 16. One-way valve assembly; 17. Mud stirring wheel; 18. Water spray pipe; 19. Filter cover; 20. Second body; 21. Connecting pipe; 22. First bearing; 23. Mounting groove; 24. Second bearing; 25. Connecting seat. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1-4The utility model provides a coalbed methane well flushing impeller pump, comprising a first main body 5, an extended diffuser body 2 is provided at the top of the inner side of the first main body 5, an oil pipe connecting hoop 1 is provided on the surface of the extended diffuser body 2, a throat pipe 7 is provided in the middle of the bottom end of the extended diffuser body 2, a secondary pressurizing nozzle 8 is provided at the connection between the first main body 5 and the throat pipe 7, a second main body 20 is provided at the bottom end of the first main body 5, a filter screen 19 is fixedly provided at the top end of the second main body 20, and a second bearing 2 is provided in the middle of the inner side of the second main body 20. 4. A transmission shaft 12 is rotatably provided in the middle of the second bearing 24. The top end of the transmission shaft 12 extends to the interior of the first main body 5 and is fixedly connected to a power drive impeller 11. A primary nozzle sleeve 10 is provided at the connection between the first main body 5 and the power drive impeller 11. A primary nozzle 9 is fixedly provided at the top end of the primary nozzle sleeve 10. A mud suction impeller 14 is fixedly provided in the middle of the surface of the transmission shaft 12. The bottom end of the transmission shaft 12 extends to the interior of the filter screen cover 19 and is fixedly connected to a mud stirring wheel 17. The interior of the second main body 20 is provided with a primary nozzle sleeve 10. A one-way valve assembly 16 is fixedly provided at the bottom of the side. The well washing impeller pump uses a surface injection pump or injects high-pressure and large-displacement liquid, which is connected to the oil pipe connecting hoop 1 through a hollow pumping pipe, and transmits the power liquid to the internal nozzle and the power-driven impeller 11. Under the throttling effect of the nozzle, a high-flow rate liquid jet is generated, and a low-pressure negative pressure area is generated between the nozzle and the throat 7. At the same time, the power-driven impeller 11 is driven to rotate to suck different media in the well liquid into the pump chamber, and after mixing at the throat 7, it is lifted to the ground through the hollow pumping pipe for filtration. The water tank is used to filter the coal powder to settle at the bottom of the water tank and discharge it into the sewage pool regularly. Part of the settled and filtered water is injected into the well through an injection pump or a pump truck to provide power fluid, and the excess water is discharged into the water reservoir. The well-washing impeller pump can smoothly pass through the inflection point and enter the horizontal section where it is blocked for circulation and cleaning. It has good passability and carrying capacity for coal powder and particles smaller than 6 mm, is not afraid of pump jamming and does not wear unevenly, greatly improving the well-washing efficiency, and can well clear the blockage problem of the coalbed methane horizontal section, which helps to improve the coalbed methane recovery rate.

[0022] A connecting seat 25 is fixedly provided in the middle of the bottom end of the filter screen cover 19, and a connecting pipe 21 is fixedly connected to the bottom end of the connecting seat 25. A water spray pipe 18 is fixedly connected to both sides of the connecting seat 25. The top ends of the two water spray pipes 18 are respectively connected to the two power fluid flow channels of the second body 20. The power fluid enters the water spray pipe 18 and is sprayed. A bearing cover plate 13 is provided at the connection between the second body 20 and the second bearing 24. The bearing cover plate 13 is correspondingly arranged with the second bearing 24. A mounting groove 23 is opened at the connection between the second body 20 and the first body 5. A first bearing 22 is fixedly provided inside the mounting groove 23. The first bearing 22 is correspondingly arranged with the transmission shaft 12.

[0023] During use, the water jets 18 are used to spray and disturb different media (mud, coal powder, and fracturing sand) in the well, so that the mud stirring wheel 17 and the mud suction impeller 14 can better stir and suck the mud. The setting of the bearing cover plate 13 can prevent the second bearing 24 from falling off during high-speed rotation, and the setting of the first bearing 22 facilitates the stable operation of the transmission shaft 12.

[0024] A flat gasket seal 4 and a tapered seal 3 are provided at the connection between the extended diffuser body 2 and the oil pipe connection hoop 1. A water inlet filter 6 is provided at the bottom of the extended diffuser body 2. A mud seal 15 is fixedly provided in the middle of the inner side of the second body 20.

[0025] When in use, the flat gasket seal 4 and the tapered seal 3 are matched to each other to achieve high-pressure sealing, the water inlet filter 6 can filter the annular power fluid, and the mud seal 15 can seal.

[0026] When the embodiment of the present application is in use: the well washing impeller pump uses a surface injection pump or injects high-pressure and large-displacement liquid, which is connected to the oil pipe connecting hoop 1 through a hollow oil pumping pipe, and transmits the power liquid to the internal nozzle and the power-driven impeller 11. Under the throttling effect of the nozzle, a high-flow rate liquid jet is generated, and a low-pressure negative pressure area is generated between the nozzle and the throat pipe 7. At the same time, the power-driven impeller 11 is driven to rotate to suck different media in the well liquid into the pump chamber, and after mixing in the throat pipe 7, it is lifted to the ground filter water tank through the hollow oil pumping pipe. The coal powder is settled at the bottom of the water tank through the filter water tank and discharged into the sewage pool regularly. Part of the settled and filtered water is injected into the well through the injection pump or pump truck to provide power fluid, and the excess water is discharged into the water reservoir. The well-washing impeller pump can smoothly pass through the inflection point and enter the horizontal section blockage for circulation and promotion cleaning. It has good passability and carrying capacity for coal powder and particles smaller than 6mm, is not afraid of pump jamming and non-uniform wear, greatly improves the well-washing efficiency, can well dredge the coalbed methane horizontal section blockage problem, and helps to improve the coalbed methane recovery rate.

[0027] 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 coalbed methane well flushing impeller pump, comprising a first body (5), characterized in that: An extended diffusion body (2) is provided at the top of the inner side of the first body (5), an oil pipe connecting hoop (1) is provided on the surface of the extended diffusion body (2), a throat (7) is provided in the middle of the bottom end of the extended diffusion body (2), a secondary pressurizing nozzle (8) is provided at the connection between the first body (5) and the throat (7), a second body (20) is provided at the bottom end of the first body (5), a filter screen (19) is fixedly provided at the top end of the second body (20), a second bearing (24) is provided in the middle of the inner side of the second body (20), and a transmission shaft (1) is rotatably provided in the middle of the second bearing (24). 2), the top end of the transmission shaft (12) extends to the interior of the first body (5) and is fixedly connected to a power-driven impeller (11), a primary nozzle sleeve (10) is provided at the connection between the first body (5) and the power-driven impeller (11), a primary nozzle (9) is fixedly provided at the top end of the primary nozzle sleeve (10), a mud suction impeller (14) is fixedly provided in the middle of the surface of the transmission shaft (12), the bottom end of the transmission shaft (12) extends to the interior of the filter screen cover (19) and is fixedly connected to a mud stirring wheel (17), and a one-way valve assembly (16) is fixedly provided at the bottom inside the second body (20).

2. The coalbed methane well flushing impeller pump according to claim 1, characterized in that: A connecting seat (25) is fixedly provided in the middle of the bottom end of the filter screen cover (19), the bottom end of the connecting seat (25) is fixedly connected to a connecting pipe (21), both sides of the connecting seat (25) are fixedly connected to water spray pipes (18), and the top ends of the two water spray pipes (18) are respectively connected to the two power fluid flow channels of the second body (20).

3. The coalbed methane well flushing impeller pump according to claim 1, characterized in that: A bearing cover plate (13) is provided at the connection between the second main body (20) and the second bearing (24), and the bearing cover plate (13) and the second bearing (24) are provided correspondingly.

4. The coalbed methane well flushing impeller pump according to claim 1, characterized in that: A mounting groove (23) is provided at the connection between the second body (20) and the first body (5), a first bearing (22) is fixedly provided inside the mounting groove (23), and the first bearing (22) is provided corresponding to the transmission shaft (12).

5. The coalbed methane well flushing impeller pump according to claim 1, characterized in that: A flat gasket seal (4) and a tapered seal (3) are provided at the connection between the extended diffuser body (2) and the oil pipe connecting hoop (1).

6. The coalbed methane well flushing impeller pump according to claim 1, characterized in that: A water inlet filter (6) is provided at the bottom of the surface of the elongated diffusion body (2).

7. The coalbed methane well flushing impeller pump according to claim 1, characterized in that: A mud sealing ring (15) is fixedly provided in the middle portion of the inner side of the second main body (20).

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