CN206233896U - For the anti-pumping blocking of gas pumping and the outer plugging device of drainage holes - Google Patents

Abstract

For the anti-pumping blocking of gas pumping and the outer plugging device of drainage holes, including drainage tube, drainage tube is provided with drainage holes, web plate is provided with drainage holes, the extraction end of drainage tube is provided with closure plate, and coaxial in drainage tube to be provided with a dredging pipe, dredging tube side part is provided with the air nozzle for being corresponded with web plate and being set, the other end of dredging pipe is connected with an ajutage by an elbow, and ajutage is provided with check valve；A position-arresting disk on the cylindrical upper sleeve through of drainage tube, position-arresting disk is provided with pack hole, and a sleeve is fixedly installed on the outward flange of position-arresting disk, and the circumferential edges of sleeve one end are provided with a circle pointed structures, the spacing ring contacted with position-arresting disk is fixed with drainage tube.The utility model can in time dredge drainage holes and be blocked, so that it is guaranteed that the constant of gas pumping operation is carried out, can thoroughly block gas crack passage, prevent tunnel air from entering drilling and extraction pipeline, the tightness of abundant lift-off seal from cracks in coal seam.

Description

Anti-gas extraction clogging and drainage hole external plugging device for gas drainage

technical field

The utility model belongs to the technical field of gas extraction in coal mines, in particular to a gas extraction blockage prevention and extraction hole external sealing device for gas extraction.

Background technique

At present, the pre-extraction of coal seam gas by underground drilling in coal mines is the main technology for regional gas control, but the concentration of gas extracted by drilling holes is low, which seriously affects the effect of coal seam gas drainage. In the process of gas extraction, as a large amount of gas is extracted from the coal body, the gas pressure and gas content of the coal seam decrease, and the elastic potential of the gas in the coal body is released, which leads to deformation, displacement, and pressure relief of the coal seam (ground stress decrease), the air permeability of coal seam increases, and a large number of microscopic cracks and pore channels are formed in the coal seam within the effective radius of drilling. Therefore, after the pre-pumping of coal seam gas, the degree of fracture development is higher. When these cracks generated by stress disturbance communicate with the outside atmosphere, if the sealing is not strict or the sealing section is short and does not exceed the significant development range of cracks, the air will flow from the coal side and the drainage borehole under the negative pressure of the extraction. The surrounding area enters the borehole and the drainage pipeline to reduce the gas concentration of the drainage system. In addition, during the gas extraction process, due to the large amount of water in the coal body, the extraction holes on the gas extraction pipes are easily blocked by coal slurry, resulting in a greatly reduced extraction efficiency.

Utility model content

In order to solve the deficiencies in the prior art, the utility model provides a simple structure, easy to operate, avoid air entering into the borehole from the coal side and the periphery of the extraction borehole, safe and reliable, and can improve the efficiency of gas extraction. It is used for gas extraction anti-clogging and drainage hole plugging device.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical scheme: the anti-gas extraction blockage and the plugging device outside the extraction hole for gas extraction, including the extraction pipe, and the extraction pipe is evenly arranged on the adjacent extraction end. There are several extraction holes, each of which is provided with a mesh plate, the extraction end of the extraction pipe is provided with a blocking plate, and a dredging pipe is arranged coaxially in the extraction pipe, and one end of the dredging pipe is connected to the inner wall of the blocking plate. Fixed connection, there is a connecting support rod between the outside of the dredging pipe and the inner wall of the extraction pipe, the side of the dredging pipe is equipped with an air nozzle corresponding to each mesh plate, and the other end of the dredging pipe is connected with a Air supply pipe, the air supply pipe extends vertically through the extraction pipe into the roadway, and a check valve is provided on the air supply pipe; a limit plate is put on the outer circle of the extraction pipe, and a limit plate is set on the limit plate. For the filling hole, a sleeve with the center line of the limit plate is fixed on the outer edge of the limit plate, and a sharp structure is set on the peripheral edge of the end of the sleeve facing the blocking plate. The limit ring that the disc contacts, the limit ring and the sleeve are respectively located on both sides of the limit disc.

A sealing ring is provided at the connection between the air supply pipe and the outer wall of the extraction pipe, a compression sleeve is set on the air supply pipe, and a locking nut is threaded on the air supply pipe to press the compression sleeve tightly against the outer circumference of the sealing ring.

By adopting the above-mentioned technical scheme, the specific principle and process of the utility model in practical application are as follows: the extraction pipe is inserted into the coal seam along the extraction hole, and the utility model is used with good fluidity, good compactness, high strength, high cohesiveness, The sealing material with strong permeability and self-expansion seals the annular cavity between the outside of the extraction pipe and the borehole, and the air supply pipe is located in the roadway and connected to the high-pressure blower in the well. After the sealing material in the borehole is solidified, a limit plate is put on the outer circle of the extraction pipe. There is a filling hole on the limit plate, and a sleeve is fixed on the outer edge of the limit plate. There is a circle of sharp structures on the peripheral edge of one end of the sleeve. Manpower or compressed air in the roadway is used to push the limit plate to move along the extraction pipe to the roadway wall. The production pipe is provided with a limit ring that is in pressure contact with the limit plate, and then through the filling hole, fill the hole sealing material into the space formed between the sleeve, the outer wall of the extraction pipe, the limit plate and the roadway wall; After the sealing material inside is solidified, connect the drainage pipe with the gas drainage branch pipe for normal gas drainage. When the water and coal in the coal seam form a coal slurry to block the screen, the flowmeter or pressure gauge installed on the extraction pipeline monitors that the gas flow rate becomes smaller, and the high-pressure blower is started, and the high-pressure air enters the dredging pipe from the air supply pipe. Finally, the air nozzle is sprayed to the screen, the coal slurry outside the screen is blown away, and the screen is dredged, so that the gas drainage operation can be carried out normally.

The utility model is provided with a sealing structure outside the inner wall of the roadway, that is, the space sealing material formed between the sleeve around the borehole, the outer wall of the extraction pipe, the limit plate and the roadway wall is sealed, which fully improves the sealing effect. The effect is to further prevent air from entering the drilling and drainage pipeline from the coal side and the periphery of the drainage drilling.

The utility model is also provided with a dredging pipe in the extraction pipe. When the drainage holes on the drainage pipes are blocked by coal slurry, blow off the mesh plates set at the drainage holes in time to fully improve the gas drainage efficiency. Since there is a one-way valve on the air supply pipe, it is possible to avoid air leakage during gas extraction (that is, air enters from the air supply pipe). The setting of sealing ring, compression sleeve and lock nut ensures the reliability of sealing. Connecting the support rod and the blocking plate plays the role of fixing the dredging pipe.

The utility model is reasonable in design, simple in structure, safe and reliable, and can be modified on the basis of the existing drainage pipe, and can timely clear the drainage holes from being blocked, thereby ensuring the continuous operation of gas drainage, and can completely block the gas The crack channel prevents roadway air from entering the drilling and drainage pipeline from the coal seam cracks, and fully improves the tightness of the seal.

Description of drawings

Fig. 1 is the structural representation of the utility model.

detailed description

As shown in Figure 1, the anti-gas extraction blockage and drainage hole plugging device of the present utility model includes a drainage pipe 1, and several gas extraction pipes are evenly arranged near the drainage end Drainage holes, a mesh plate 5 is arranged in each drainage hole, a blocking plate 2 is provided at the extraction end of the extraction pipe 1, and a dredging pipe 3 is arranged coaxially in the extraction pipe 1, and the opening of the dredging pipe 3 One end is fixedly connected to the inner wall of the blocking plate 2, a connecting support rod 4 is provided between the outer side of the dredging pipe 3 and the inner wall of the extraction pipe 1, and the side of the dredging pipe 3 is provided with an air nozzle 17 corresponding to each mesh plate 5, The other end of the dredging pipe 3 is connected with an air supply pipe 7 through an elbow 6, and the air supply pipe 7 vertically passes through the extraction pipe 1 and extends into the roadway, and the air supply pipe 7 is provided with a check valve 8; A limit disc 9 is put on the outer circle of the tube 1, and a filling hole 10 is arranged on the limit disc 9, and a sleeve 11 concentric with the limit disc 9 is fixedly arranged on the outer edge of the limit disc 9, A ring of sharp structures 12 is provided on the peripheral edge of the end of the sleeve 11 facing the blocking plate 2, and a limit ring 13 that is in contact with the limit disc 9 is fixed on the extraction pipe 1, and the limit ring 13 and the sleeve 11 are respectively located at the limit Both sides of the bit disk 9.

A sealing ring 14 is provided at the connection between the air supply pipe 7 and the outer wall of the extraction pipe 1, and a compression sleeve 15 is set on the air supply pipe 7, and the upper air supply pipe 7 is threaded to press the compression sleeve 15 to the outside of the sealing ring 14. Circumferential lock nut 16.

The specific principle and process of the utility model in practical application are as follows: extend the extraction pipe 1 into the coal seam along the extraction hole, use it with good fluidity, good compactness, high strength, high cohesiveness, strong permeability, The self-expandable sealing material seals the annular cavity between the outside of the extraction pipe 1 and the borehole, and the air supply pipe 7 is located in the roadway and connected to the high-pressure blower in the well. After the sealing material in the borehole is solidified, a limit disc 9 is put on the outer circle of the extraction pipe 1. The limit disc 9 is provided with a filling hole 10, and the outer edge of the limit disc 9 is fixed. A sleeve 11, one end of the sleeve 11 is provided with a circle of sharp structures 12 on the peripheral edge, using manpower or compressed air in the roadway to push the limit plate 9 to move along the extraction pipe 1 to the roadway wall, and a circle of sharp edges at the end of the sleeve 11 The structure 12 is pierced into the roadway wall, and then a limit ring 13 that is in pressure contact with the limit plate 9 is provided on the extraction pipe 1, and then through the filling hole 10, the sleeve 11, the outer wall of the extraction pipe 1, and the limit ring 13 are provided. The space formed between the disk 9 and the roadway wall is filled with sealing material; after the sealing material in the sleeve 11 is solidified, the drainage pipe 1 is connected with the gas drainage branch pipe for normal gas drainage. When the water and coal in the coal seam form a coal slurry to block the screen plate 5, the flow meter or pressure gauge installed on the first extraction pipe monitors that the gas flow rate becomes smaller, and the high-pressure blower is started, and the high-pressure air enters from the air supply pipe 7 The pipe 3 is dredged, and finally the air nozzle 17 is sprayed to the net plate 5, the coal slurry outside the net plate 5 is blown away, and the net plate 5 is dredged, so that the gas drainage operation can be carried out normally.

This embodiment does not impose any formal restrictions on the shape, material, structure, etc. of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the utility model belong to the technology of the utility model. protection scope of the program.

Claims (2)

1. The anti-gas extraction blockage and drainage hole plugging device for gas drainage is characterized in that: it includes a drainage pipe, and several drainage holes are evenly arranged on the drainage pipe adjacent to the drainage end, each A stencil is arranged in each extraction hole, a blocking plate is provided at the extraction end of the extraction pipe, and a dredging pipe is arranged coaxially in the extraction pipe, one end of the dredging pipe is fixedly connected with the inner wall of the blocking plate, and the outside of the dredging pipe is connected with the extraction pipe. There are connecting support rods between the inner walls of the mining pipes, and the side of the dredging pipe is provided with air nozzles corresponding to each screen plate one by one. The other end of the dredging pipe is connected to an air supply pipe through an elbow, and the air supply pipe is vertical. It passes through the extraction pipe and extends into the roadway, and the air supply pipe is provided with a one-way valve; the outer circle of the extraction pipe is covered with a limit plate, and the limit plate is provided with a filling hole. A sleeve with the same center line as the limit plate is fixed on the edge, and a circle of sharp structures is provided on the peripheral edge of the end of the sleeve facing the blocking plate. The position ring and the sleeve are respectively located on both sides of the limit disc. 2. The anti-gas extraction blockage and drainage hole plugging device for gas extraction according to claim 1, characterized in that: a sealing ring is provided at the connection between the air supply pipe and the outer wall of the extraction pipe, and the air supply pipe The upper sleeve is provided with a compression sleeve, and the upper thread of the air supply pipe is connected with a lock nut for pressing the compression sleeve tightly against the outer circumference of the sealing ring.