Coal seam directional long drill hole mining-following segmented hole sealing device and method

Abstract

The invention discloses a coal seam directional long drill hole mining-following segmented hole sealing device and method. The device comprises an extraction header pipe, an inflation pipeline, a hole sealing air bag, a hard screen, a polyurethane plugging block and an inflation bottle. The extraction header pipe comprises a plurality of gas extraction pipes which are mutually connected, the extraction header pipe is arranged in the directional long drill hole, the hole sealing air bag is vertically arranged in the extraction header pipe, the hole sealing air bag is communicated with an inflation inlet of the inflation pipeline through a spiral air nozzle, and an air inlet of the inflation pipeline is connected with the inflation bottle; a polyurethane plugging block is arranged between the outer side of the pipe wall of the extraction header pipe and the inner wall of the directional long drill hole, the polyurethane plugging block is arranged at the position away from an opening of the extraction header pipe by a certain distance (generally 8 m), a connecting channel is formed in the polyurethane plugging block, the inflation pipeline is arranged in the connecting channel, and the hard screen is arranged on the front side of the hole sealing air bag. And the hole sealing air bag is adhered to the hard screen. According to the method, a gas extraction blank area of the coal seam is eliminated, the possibility of gas disasters is reduced, and the gas extraction rate is increased.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of coal seam gas extraction, and particularly relates to a coal seam directional long borehole mining section sealing device and method. BACKGROUND

[0002] Coal is an important cornerstone of China's economic development and a stabilizer of energy security. With the increase of coal seam mining depth, the coal seam gradually presents the characteristics of high gas, and the possibility of gas disaster gradually increases, which constitutes a major threat to the high-quality development of the coal industry and the life safety and health of miners. Therefore, in order to reduce the possibility of gas disaster, effective measures must be taken to reduce the gas content of the coal seam. The coal seam bedding borehole gas extraction is an effective method to reduce the gas content of the coal seam. The bedding borehole is drilled along the inclination direction of the coal seam through the roadway wall of the air inlet and return and return roadway. However, for longwall faces, due to the long length of the working face and the loss of extraction negative pressure along the way, the bedding borehole drilled through the roadway wall of the air inlet and return and return roadway has a gas extraction blank area, i.e. the middle region of the coal seam is a gas extraction blank area, which hides gas disasters. Drilling directional long boreholes along the strike direction of the coal seam for gas extraction is an effective solution. The process flow is as follows: first, drilling directional long boreholes; second, placing a gas extraction pipe in the directional long borehole; and finally, sealing the hole at a certain distance from the hole of the directional bedding long borehole. However, as the working face advances along the strike direction, the gas extraction pipe in the directional long borehole will be damaged by the coal mining machine, the gas extraction pipe will be connected to the atmosphere, and the gas extraction pipe will be ineffective. Therefore, a coal seam directional long borehole mining section sealing device and method for eliminating the coal seam gas extraction blank area and reducing the possibility of gas disaster is needed. SUMMARY

[0003] The present application provides a coal seam directional long borehole mining section sealing device and method for eliminating the coal seam gas extraction blank area and reducing the possibility of gas disaster, which is suitable for the coal seam. By arranging a sealing air bag in the gas extraction pipe at regular intervals, the sealing air bag is inflated to block the gas extraction pipe as the working face advances along the strike direction of the coal seam, so that the gas extraction pipe is not connected to the air, thereby eliminating the coal seam gas extraction blank area, reducing the possibility of gas disaster, and improving the gas extraction rate.

[0004] To solve the above technical problems, the present application adopts the following technical solutions: the coal seam directional long borehole gas extraction and sectional sealing device comprises a gas extraction main pipe, an inflation pipeline, a sealing air bag, a hard screen, a polyurethane sealing block and an inflation bottle; the gas extraction main pipe comprises a plurality of mutually connected gas extraction pipes, the gas extraction main pipe is arranged in the directional long borehole, the sealing air bag is vertically arranged in the gas extraction main pipe, the sealing air bag is connected with the inflation port of the inflation pipeline through a spiral air nozzle, the inflation port of the inflation pipeline is connected with the inflation bottle, the polyurethane sealing block is arranged between the outer side of the pipe wall of the gas extraction main pipe and the inner wall of the directional long borehole, the polyurethane sealing block is provided with a connecting channel, the inflation pipeline is arranged in the connecting channel, the hard screen is arranged on the front side of the sealing air bag, and the sealing air bag is bonded with the hard screen.

[0005] The pipe wall of the gas extraction main pipe is provided with a through hole, the spiral air nozzle of the sealing air bag is connected with the inner port of the through hole, and the inflation port of the inflation pipeline is connected with the outer port of the through hole.

[0006] The number of the sealing air bags is at least one, the number of the inflation pipelines corresponds to the number of the sealing air bags, and each inflation pipeline penetrates the polyurethane sealing block.

[0007] The inflation pipeline is connected with the inflation main pipe through a multi-way joint, and the inflation main pipe is connected with the inflation bottle.

[0008] The inflation main pipe is provided with a pressure regulating valve, and the inflation pipeline is provided with an inflation valve.

[0009] The polyurethane sealing block is 8-12 m away from the pipe opening of the gas extraction main pipe.

[0010] The coal seam directional long borehole gas extraction and sectional sealing method is implemented based on the above coal seam directional long borehole gas extraction and sectional sealing device, and comprises the following steps: (1) a plurality of detachably connected gas extraction pipes are arranged in the directional long borehole for coal seam construction, a sealing air bag is arranged in the gas extraction pipe, the sealing air bag is connected with the inflation pipeline through a spiral air nozzle, the inflation pipeline is connected with the inflation main pipe through a multi-way joint, and the inflation main pipe is connected with the inflation bottle; (2) polyurethane is used to seal the directional long borehole, the polyurethane forms a polyurethane block after sealing, and the sealing distance is usually 8 m; (3) as the coal mining machine advances, the range of the goaf gradually increases, the innermost end of the gas extraction pipe arranged in the coal seam will be damaged in the coal mining process, thereby causing the innermost end of the gas extraction pipe to be connected with air, and the coal mining work cannot be carried out due to the influence of air; at this time, the inflation bottle is opened, the pressure regulating valve on the inflation main pipe is opened, and the inflation valve on the inflation pipeline connected with the sealing air bag at the innermost end is opened, the inflation bottle inflates the sealing air bag through the inflation pipeline, thereby sealing the gas extraction pipe at the innermost end, and avoiding the influence of air connection; (4) with the continuous forward advance of the coal mining machine, the innermost end bulging hole sealing air bag will be destroyed, at this time, the inflation valve on the inflation pipeline connected with the hole sealing air bag adjacent to the innermost end hole sealing air bag is opened, the inflation bottle inflates the hole sealing air bag through the inflation pipeline to make it bulge, and then the gas drainage pipe is sealed again, the coal mining machine continues to advance forward, and the hole sealing air bag is inflated in turn to realize the sectional hole sealing of the coal seam directional long borehole.

[0011] In summary, the present application is simple and convenient to operate, the hole sealing air bag is arranged in the gas drainage pipe at a certain interval, the hole sealing air bag is inflated to seal the gas drainage pipe as the working face advances along the coal seam trend, so that the gas drainage pipe is not connected with the air, and then the blank area of the coal seam gas drainage is eliminated, the possibility of gas disaster is reduced, and the gas drainage rate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic diagram of the present application; Figure 2 is Figure 1 an enlarged view of A part in DETAILED DESCRIPTION Example one

[0013] Figures 1-2 As shown in the figure, the coal seam directional long borehole random sectional hole sealing device comprises a drainage main pipe 1, an inflation pipeline 2, a hole sealing air bag 3, a hard screen 4, a polyurethane sealing block 5, and an inflation bottle 6. The drainage main pipe 1 comprises a plurality of gas drainage pipes connected with each other, the drainage main pipe 1 is arranged in the directional long borehole 11, the hole sealing air bag 3 is vertically arranged in the drainage main pipe 1, the hole sealing air bag 3 is connected with the inflation port of the inflation pipeline 2 through a spiral air nozzle 7, the inflation port of the inflation pipeline 2 is connected with the inflation bottle 6, the polyurethane sealing block 5 is arranged between the outer side of the pipe wall of the drainage main pipe 1 and the hole inner wall of the directional long borehole 11, a connecting channel is arranged on the polyurethane sealing block 5, the inflation pipeline 2 is arranged in the connecting channel, the hard screen 4 is arranged on the front side of the hole sealing air bag 3, and the hole sealing air bag 3 is bonded on the hard screen 4 to prevent the movement of the hole sealing air bag 3. The polyurethane sealing block 5 can seal the directional long borehole 11, and is completely filled between the outer side of the pipe wall of the drainage main pipe 1 and the hole inner wall of the directional long borehole 11 to ensure the sealing property. In addition, the polyurethane sealing block 5 is arranged at a certain distance from the pipe port of the gas drainage pipe, the polyurethane sealing block 5 is 8-12 m away from the pipe port of the drainage main pipe, and is most preferably arranged at 8 m from the pipe port of the gas drainage pipe.

[0014] The polyurethane sealing block 5 is arranged at a certain distance from the pipe port of the gas drainage pipe, the polyurethane sealing block 5 is 8-12 m away from the pipe port of the drainage main pipe, and is most preferably arranged at 8 m from the pipe port of the gas drainage pipe.

[0015] The number of the hole sealing air bags 3 is at least one, the number of the inflation pipelines 2 corresponds to the number of the hole sealing air bags 3 one by one, and each of the inflation pipelines 2 passes through the polyurethane sealing block 5. At the beginning of the coal mining, one hole sealing air bag 3 is arranged in the first gas extraction pipe, and with the advancing of the coal mining machine, the number of the gas extraction pipes is gradually increased, and the number of the hole sealing air bags 3 is also increased, each of the hole sealing air bags 3 is connected with a single inflation pipeline 2, and each of the single inflation pipelines 2 is provided with a corresponding inflation valve 9 to ensure the individual control of each of the inflation pipelines 2. The inflation pipelines 2 are connected with the inflation main pipe 12 through the multi-way joint 15, and the inflation main pipe 12 is connected with the inflation bottle 6. The inflation main pipe 12 is provided with the pressure regulating valve 8, and the inflation pipeline 2 is provided with the inflation valve 9.

[0016] The present application is simple and convenient to operate, the hole sealing air bags 3 are arranged in the gas extraction pipe at a certain interval, the hole sealing air bags 3 are inflated to seal the gas extraction pipe with the advancing of the working face along the coal seam, so that the gas extraction pipe is not communicated with the air, and the blank area of the coal seam gas extraction is eliminated, the possibility of the gas disaster is reduced, and the gas extraction rate is improved. Example two

[0017] The present application is simple and convenient to operate, the hole sealing air bags 3 are arranged in the gas extraction pipe at a certain interval, the hole sealing air bags 3 are inflated to seal the gas extraction pipe with the advancing of the working face along the coal seam, so that the gas extraction pipe is not communicated with the air, and the blank area of the coal seam gas extraction is eliminated, the possibility of the gas disaster is reduced, and the gas extraction rate is improved. (1) A plurality of detachable gas extraction pipes are arranged in the directional long drill hole 11 of the coal seam 13, and the hole sealing air bags 3 are arranged in the gas extraction pipe, the hole sealing air bags 3 are connected with the inflation pipelines 2 through the spiral air nozzles 7, the inflation pipelines 2 are connected with the inflation main pipe 12 through the multi-way joint 15, and the inflation main pipe 12 is connected with the inflation bottle 6; (2) The polyurethane is used to seal the directional long drill hole 11, and the polyurethane forms the polyurethane block 5 after the sealing, and the sealing distance is usually 8 m; (3) With the advancing of the coal mining machine, the advancing direction of the coal mining machine is indicated by the arrow 14, the range of the goaf 10 is gradually increased, and the innermost end of the gas extraction pipe arranged in the coal seam 13 will be damaged in the process of the coal mining, and then the innermost end of the gas extraction pipe is communicated with the air, which causes the coal mining work to be affected by the air and unable to be carried out. At this time, the inflation bottle 6 is opened, the pressure regulating valve 8 on the inflation main pipe 12 is opened, and the inflation valve 9 on the inflation pipeline 2 connected with the hole sealing air bag 3 at the innermost end is opened, the inflation bottle 6 inflates the hole sealing air bag 3 through the inflation pipeline 2 to make it swell, and then the innermost end of the gas extraction pipe is sealed to avoid the influence of the air communication; (4) with the continuous advancing of the coal mining machine, the innermost bulging hole sealing air bag 3 will be destroyed, at this time, the inflation valve 9 connected to the inflation pipeline 2 of the hole sealing air bag 3 adjacent to the innermost hole sealing air bag 3 is opened, the inflation bottle 6 inflates the hole sealing air bag 3 through the inflation pipeline 2 to make it bulge, and then the gas drainage pipe is sealed again, the coal mining machine continues to advance, and the hole sealing air bag 3 is inflated in turn, so that the sectional hole sealing of the directional long borehole 11 in the coal seam can be realized.

[0018] The embodiment is not limited in shape, material, structure and the like of the present application in any form, and any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present application are within the protection scope of the technical scheme of the present application.

Claims

1. This coal seam directional long drilling and segmented sealing device is characterized by: It includes an extraction main pipe, an inflation pipeline, a sealing airbag, a hard screen, a polyurethane sealing block, and an inflation bottle; the extraction main pipe includes several interconnected gas extraction pipes, the extraction main pipe is arranged in a directional long borehole, the sealing airbag is vertically arranged in the extraction main pipe, the sealing airbag is connected to the inflation port of the inflation pipeline through a spiral air nozzle, the air inlet of the inflation pipeline is connected to the inflation bottle, a polyurethane sealing block is arranged between the outer side of the pipe wall of the extraction main pipe and the inner wall of the directional long borehole, a connecting channel is arranged on the polyurethane sealing block, the inflation pipeline is arranged in the connecting channel, the hard screen is arranged on the front side of the sealing airbag, and the sealing airbag is bonded to the hard screen.

2. The coal seam directional long drilling and segmented sealing device according to claim 1 is characterized in that: A through hole is provided on the pipe wall of the extraction main pipe, the spiral air nozzle of the sealing air bag is connected to the inner port of the through hole, and the inflation port of the inflation pipeline is connected to the outer port of the through hole.

3. The coal seam directional long drilling and segmented sealing device according to claim 2 is characterized in that: The number of the sealing airbag is at least one, the number of the inflation pipelines corresponds to the number of the sealing airbags, and each inflation pipeline passes through the polyurethane sealing block.

4. The coal seam directional long drilling and segmented sealing device according to claim 3 is characterized in that: The inflation pipeline is connected to the inflation main pipe through a multi-way joint, and the inflation main pipe is connected to the inflation bottle.

5. The coal seam directional long drilling and segmented sealing device according to claim 4 is characterized in that: A pressure regulating valve is provided on the inflation main pipe, and an inflation valve is provided on the inflation pipeline.

6. The coal seam directional long drilling and segmented sealing device according to claim 5 is characterized in that: The polyurethane sealing block is 8 to 12 meters away from the main extraction pipe outlet.

7. The method for sealing a directional long hole in a coal seam while mining is implemented based on the device for sealing a directional long hole in a coal seam while mining according to any one of claims 1 to 6, and is characterized in that: The steps include: (1) A multi-section detachable gas extraction pipe is arranged in a directional long borehole constructed in a coal seam, and a sealing air bag is set in the gas extraction pipe. The sealing air bag is connected to the inflation pipeline through a spiral air nozzle, and the inflation pipeline is connected to the inflation main pipe through a multi-way joint, and the inflation main pipe is connected to the inflation bottle; (2) Use polyurethane to seal the directional long drill hole. After sealing, the polyurethane forms a polyurethane block. The sealing distance is usually 8m; (3) As the coal mining machine advances forward, the scope of the goaf gradually increases. During the coal mining process, the innermost end of the gas extraction pipe arranged in the coal seam will be damaged, causing the innermost end of the gas extraction pipe to be connected to the air, resulting in the coal mining work being unable to proceed due to the influence of the air. At this time, open the gas bottle, open the pressure regulating valve on the gas main pipe, and open the gas valve on the gas pipeline connected to the innermost sealing air bag. The gas bottle inflates the sealing air bag through the gas pipeline to make it swell, thereby blocking the innermost gas extraction pipe to avoid being affected by the air connection; (4) As the coal mining machine continues to advance forward, the innermost bulging sealing airbag will be destroyed. At this time, the inflation valve on the inflation pipeline connected to the sealing airbag adjacent to the innermost sealing airbag is opened, and the inflation bottle inflates the sealing airbag through the inflation pipeline to make it bulge, and then the gas extraction pipe is blocked again. The coal mining machine continues to advance forward, and the sealing airbags are inflated in turn to achieve segmented sealing of the directional long drilling hole in this coal seam.

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