Sand fishing and coal fishing silty sand shovel for coal bed gas horizontal well
By using the sand retrieval pump to generate negative and positive pressure in the coalbed methane horizontal well sand retrieval tool, combined with the sealing mechanism of Ver spring, the problems of sand, coal powder reflow and water discharge are solved, and the sand retrieval efficiency and efficiency are improved.
Patent Information
- Application Number
- CN202323637256.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-29
AI Technical Summary
During the coalbed methane mining process, traditional horizontal well sand fishing tools cannot effectively avoid the return of sand and coal powder, and cannot assist in the discharge of water, affecting efficiency.
A coalbed methane horizontal well sand-fed coal slurry shovel was designed. The piston inside the sand-fed pump was upward to generate suction force to generate negative pressure in the sand storage pipe. The Ver spring was used to seal the opening hole to avoid reflux and flow downward through the piston. Generates thrust to generate positive pressure discharge water in the sand storage pipe.
It effectively avoids the return of sand and coal powder, improves sand retrieval efficiency, assists in water discharge, and improves the capacity of sand storage pipes.
Smart Images
Figure CN222184703U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coalbed methane tools, in particular to a shovel for bailing sand and coal powder in a coalbed methane horizontal well. Background Art
[0002] Coalbed methane (CBM) is a gas resource associated with coal. It refers to hydrocarbon gas stored in coal seams, with methane as its main component. It is an unconventional natural gas. During the CBM extraction process, sand and coal dust removal operations are required in horizontal wells.
[0003] Horizontal wells are the main well type for coalbed methane development, but the quartz sand and coal powder discharged during coalbed methane production have caused great difficulties in production. In traditional technologies, sand and coal powder are generally removed by flushing sand and coal powder, which has a huge impact on the disturbance of the horizontal well formation. The injection of high-pressure water has caused great harm to the channels near the wellbore, making it difficult for the horizontal well production to return to the initial level. Then, sand bailing tools are used. During the sand bailing process, sand and coal powder are adsorbed into the sand storage pipe by a pump. In the existing technology, the sand storage pipe lacks an effective non-return function, and sand and coal powder are easy to flow back and fall out, affecting efficiency. In addition, the existing sand storage pipe cannot assist in the discharge of water and has a single function. Therefore, the utility model proposes a sand shovel for bailing sand and coal powder in a coalbed methane horizontal well to solve the problems existing in the existing technology. Utility Model Content
[0004] In response to the above problems, the utility model proposes a shovel for bailing sand and coal powder in coalbed methane horizontal wells. The shovel generates suction through the upward movement of the piston inside the sand bailing pump, so that negative pressure is generated in the sand storage pipe, and the regulating valve is sucked up. The sand or coal powder and liquid in the well are sucked into the sand storage pipe through the unsealing hole and the through groove. Then, the valve spring is used to push the regulating valve sealing column to fix the unsealing hole of the valve seat to avoid backflow, thereby ensuring the effect of bailing sand and coal powder.
[0005] To achieve the purpose of the utility model, the utility model is implemented through the following technical solutions: a sand shovel for bailing sand and coal powder in a coalbed methane horizontal well, comprising a sand shovel outer cylinder and a fixed valve seat, wherein the fixed valve seat is arranged at the lower part of the inner part of the sand shovel outer cylinder, and a fixed block is provided inside the sand shovel outer cylinder above the fixed valve seat, a valve spring is provided at the middle position of the bottom of the fixed block, and an adjustable valve is provided under the valve spring, the inner part of the fixed valve seat is hollow, and the adjustable valve is used to seal the hollow part of the fixed valve seat;
[0006] A through groove is provided at the edge of the interior of the fixed block, a sand storage pipe is provided above the interior of the sand shovel outer cylinder, and the bottom of the sand storage pipe is supported on the fixed block, and the through groove is communicated with the interior of the sand storage pipe.
[0007] A further improvement is that the hollow space inside the fixed valve seat is an unsealing hole, and the diameter of the adjusting valve is larger than the diameter of the unsealing hole.
[0008] A further improvement is that: the bottom of the sand shovel outer cylinder is a through opening, and a sand shovel head is connected to the through opening, and the sand shovel head and the sand shovel outer cylinder are integrally formed.
[0009] A further improvement is that a fixed track is provided below the inner portion of the outer cylinder of the sand shovel, and the fixed track is supported between the fixed block and the fixed valve seat.
[0010] A further improvement is that a joint is provided at the upper end of the sand storage pipe, and the joint is used to connect to a sand bailing pump, and the sand storage pipe is communicated with the sand bailing pump.
[0011] A further improvement is that the sand bailing pump is connected to the sand storage pipe to generate negative pressure, and the pressure of the negative pressure is greater than the elastic force of the valve spring.
[0012] The beneficial effects of the utility model are:
[0013] 1. The utility model generates suction by the upward movement of the piston inside the sand bailing pump, so that negative pressure is generated in the sand storage pipe, the regulating valve is sucked up, and the sand or coal powder and liquid in the well are sucked into the sand storage pipe through the unsealing hole and the through groove. Then, the valve spring is used to push the regulating valve sealing column to fix the unsealing hole of the valve seat to avoid backflow, thereby ensuring the effect of bailing sand and coal powder.
[0014] 2. When the piston of the sand bailing pump of the utility model generates thrust by moving downward, a valve similar to an adjusting valve is provided inside the sand bailing pump, and positive pressure is generated in the sand storage pipe. The valve inside the sand bailing pump is lifted up, and the adjusting valve continues to block the fixed valve seat. At this time, the liquid in the sand storage pipe can be discharged through the valve inside the sand bailing pump, which facilitates the discharge of auxiliary water and improves the efficiency of the sand storage pipe in accommodating sand and coal powder. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural diagram of the utility model;
[0016] Figure 2 This is a schematic diagram of the installation and connection of the sand bailing pump of the present invention.
[0017] Among them: 1. Sand shovel outer tube; 2. Fixed valve seat; 3. Fixed block; 4. Valve spring; 5. Adjustable valve; 6. Through groove; 7. Sand storage pipe; 8. Unsealing hole; 9. Sand shovel head; 10. Fixed track; 11. Connector; 12. Sand bailing pump. DETAILED DESCRIPTION
[0018] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments. The embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.
[0019] Example 1
[0020] according to Figure 1 、 2 As shown, this embodiment proposes a sand shovel for bailing sand and coal powder in a coalbed methane horizontal well, comprising a sand shovel outer cylinder 1 and a fixed valve seat 2. The fixed valve seat 2 is arranged at the lower part of the sand shovel outer cylinder 1, and a fixed block 3 is provided inside the sand shovel outer cylinder 1 above the fixed valve seat 2. A valve spring 4 is provided at the middle position of the bottom of the fixed block 3, and an adjusting valve 5 is provided under the valve spring 4. The fixed valve seat 2 is hollow inside, and the adjusting valve 5 is used to seal the hollow part of the fixed valve seat 2.
[0021] A through slot 6 is provided at the edge of the interior of the fixed block 3, and a sand storage pipe 7 is provided above the interior of the sand shovel outer tube 1. The lower portion of the sand storage pipe 7 is supported on the fixed block 3, and the through slot 6 is connected to the interior of the sand storage pipe 7. During use, suction is generated by the upward movement of the piston inside the sand bailing pump 12, which creates a negative pressure inside the sand storage pipe 7. When the negative pressure reaches a certain value, the regulating valve 5 is sucked up, and the sand or coal powder and liquid in the well are sucked into the sand storage pipe 7 through the unsealing hole 8 and the through slot 6. Subsequently, the valve spring 4 is used to push the regulating valve 5 to block the unsealing hole 8 of the fixed valve seat 2, thereby preventing backflow and ensuring the effectiveness of bailing sand and coal powder. At the same time, when the piston of the sand bailing pump 12 moves downward to generate thrust, a positive pressure is generated in the sand storage pipe 7 due to the valve similar to the regulating valve 5 provided inside the sand bailing pump 12. When the positive pressure reaches a certain value, the valve inside the sand bailing pump 12 is lifted up, and the regulating valve 5 continues to block the fixed valve seat 2. At this time, the liquid in the sand storage pipe 7 can be discharged through the valve inside the sand bailing pump 12, which facilitates the discharge of auxiliary water and improves the efficiency of the sand storage pipe 7 in accommodating sand and coal powder.
[0022] The hollow inside the fixed valve seat 2 is an unsealing hole 8, and the diameter of the adjustable valve 5 is larger than the diameter of the unsealing hole 8. When in use, the unsealing hole 8 is blocked or opened by adjusting the valve 5, which is convenient for the passage of sand and coal powder and also convenient for preventing backflow.
[0023] The lower part of the sand shovel outer cylinder 1 is a through opening, and a sand shovel head 9 is connected to the lower part of the through opening. The sand shovel head 9 is integrally formed with the sand shovel outer cylinder 1. When encountering an obstacle, the obstacle can be shoveled loose by the sand shovel head 9.
[0024] A fixed track 10 is provided below the inside of the sand shovel outer tube 1, and the fixed track 10 is supported between the fixed block 3 and the fixed valve seat 2. When in use, the fixed track 10 is supported between the fixed block 3 and the fixed valve seat 2, ensuring that the adjustment valve 5 has enough adjustment space.
[0025] Example 2
[0026] according to Figure 1 、 2 As shown, this embodiment proposes a sand shovel for bailing sand and coal powder in a coalbed methane horizontal well, comprising a sand shovel outer cylinder 1 and a fixed valve seat 2. The fixed valve seat 2 is arranged at the lower part of the sand shovel outer cylinder 1, and a fixed block 3 is provided inside the sand shovel outer cylinder 1 above the fixed valve seat 2. A valve spring 4 is provided at the middle position of the bottom of the fixed block 3, and an adjusting valve 5 is provided under the valve spring 4. The fixed valve seat 2 is hollow inside, and the adjusting valve 5 is used to seal the hollow part of the fixed valve seat 2.
[0027] A through slot 6 is provided at the edge of the interior of the fixed block 3, and a sand storage pipe 7 is provided above the interior of the sand shovel outer tube 1. The lower portion of the sand storage pipe 7 is supported on the fixed block 3, and the through slot 6 is connected to the interior of the sand storage pipe 7. During use, suction is generated by the upward movement of the piston inside the sand bailing pump 12, which creates a negative pressure inside the sand storage pipe 7. When the negative pressure reaches a certain value, the regulating valve 5 is sucked up, and the sand or coal powder and liquid in the well are sucked into the sand storage pipe 7 through the unsealing hole 8 and the through slot 6. Subsequently, the valve spring 4 is used to push the regulating valve 5 to block the unsealing hole 8 of the fixed valve seat 2, thereby preventing backflow and ensuring the effectiveness of bailing sand and coal powder. At the same time, when the piston of the sand bailing pump 12 moves downward to generate thrust, a positive pressure is generated in the sand storage pipe 7 due to the valve similar to the regulating valve 5 provided inside the sand bailing pump 12. When the positive pressure reaches a certain value, the valve inside the sand bailing pump 12 is lifted up, and the regulating valve 5 continues to block the fixed valve seat 2. At this time, the liquid in the sand storage pipe 7 can be discharged through the valve inside the sand bailing pump 12, which facilitates the discharge of auxiliary water and improves the efficiency of the sand storage pipe 7 in accommodating sand and coal powder.
[0028] The upper end of the sand storage pipe 7 is provided with a connector 11, which is used to connect to a sand bailing pump 12. The sand storage pipe 7 is in communication with the sand bailing pump 12. The sand bailing pump 12 is connected to the sand storage pipe 7 to generate negative pressure, and the pressure of the negative pressure is greater than the elastic force of the valve spring 4. During use, because the pressure of the negative pressure is greater than the elastic force of the valve spring 4, when the piston inside the sand bailing pump 12 moves upward, suction is generated, causing negative pressure to be generated in the sand storage pipe 7. When the negative pressure reaches a certain value, it exceeds the pressure of the valve spring 4, causing the regulating valve 5 to be sucked up, and the sand or coal powder and liquid in the well are sucked into the sand storage pipe 7 through the unsealing hole 8 and the through groove 6.
[0029] The coalbed methane horizontal well sand and coal dust shovel generates suction by the upward movement of the piston inside the sand pump 12, which creates a negative pressure in the sand storage pipe 7. When the negative pressure reaches a certain value, the regulating valve 5 is sucked up, and the sand or coal dust in the well and the liquid are sucked into the sand storage pipe 7 through the unsealing hole 8 and the through groove 6. Then, the valve spring 4 is used to push the regulating valve 5 to block the unsealing hole 8 of the fixed valve seat 2, preventing backflow and ensuring the effectiveness of sand and coal dust shoveling. At the same time, when the piston of the sand pump 12 moves downward to generate thrust, a valve similar to the regulating valve 5 is set inside the sand pump 12, generating a positive pressure in the sand storage pipe 7. When the positive pressure reaches a certain value, the valve inside the sand pump 12 is pushed up, and the regulating valve 5 continues to block the fixed valve seat 2. At this time, the liquid in the sand storage pipe 7 can be discharged through the valve inside the sand pump 12, facilitating the discharge of auxiliary water and improving the efficiency of the sand storage pipe 7 in containing sand and coal dust.
[0030] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.
Claims
1. A sand shovel for bailing sand and coal powder in a coalbed methane horizontal well, comprising a sand shovel outer tube (1) and a fixed valve seat (2), characterized in that: The fixed valve seat (2) is arranged at the lower part of the sand shovel outer tube (1), and a fixed block (3) is arranged inside the sand shovel outer tube (1) above the fixed valve seat (2), a valve spring (4) is arranged at the middle position of the bottom of the fixed block (3), and an adjusting valve (5) is arranged under the valve spring (4), the fixed valve seat (2) is hollow inside, and the adjusting valve (5) is used to block the hollow part of the fixed valve seat (2); A through groove (6) is provided at the edge of the interior of the fixed block (3); a sand storage pipe (7) is provided above the interior of the sand shovel outer tube (1); and the bottom of the sand storage pipe (7) is supported on the fixed block (3); and the through groove (6) is communicated with the interior of the sand storage pipe (7); The hollow portion inside the fixed valve seat (2) is an unsealing hole (8); the diameter of the adjusting valve (5) is larger than the diameter of the unsealing hole (8); the bottom of the sand shovel outer tube (1) is a through opening, and a sand shovel head (9) is connected below the through opening; the sand shovel head (9) and the sand shovel outer tube (1) are integrally formed; a fixed track (10) is provided below the inside of the sand shovel outer tube (1), and the fixed track (10) is supported between the fixed block (3) and the fixed valve seat (2).
2. A coal bed methane horizontal well sand shovel for bailing coal dust according to claim 1, characterized in that: A joint (11) is provided at the upper end of the sand storage pipe (7), and the joint (11) is used to be connected to a sand bailing pump (12), and the sand storage pipe (7) is in communication with the sand bailing pump (12).
3. A coal bed methane horizontal well sand shovel for bailing coal dust according to claim 2, characterized in that: The sand bailing pump (12) is connected to the sand storage pipe (7) to generate negative pressure, and the pressure of the negative pressure is greater than the elastic force of the valve spring (4).