Wall supporting pipe for coal seam drilling and coal seam gas extraction system using wall supporting pipe

Abstract

The invention relates to a supporting wall pipe for coal seam drilling and a coal seam gas extraction system using the supporting wall pipe, the supporting wall pipe for coal seam drilling comprises a pipe body axially extending in the front-back direction, and the pipe body is formed by splicing at least three arc-shaped pipe pieces which are sequentially and independently arranged in the circumferential direction. An elastic film which extends in the front-back direction and is used for sealing a gap between every two adjacent arc-shaped pipe segments is arranged between every two adjacent arc-shaped pipe segments, radial water permeable holes are formed in the arc-shaped pipe segments, and the wall supporting pipe for coal seam drilling further comprises a plurality of positioning rings which are arranged in the front-back direction at intervals and located on the inner side of the pipe body. The positioning ring is provided with guide rods which are arranged corresponding to the arc-shaped pipe segments and extend in the radial direction of the pipe body, and each arc-shaped pipe segment is provided with a pipe segment guide hole matched with the corresponding guide rod in a guiding and moving mode. The invention provides a drill hole wall supporting pipe which does not affect coal seam water injection and can prevent a drill hole from collapsing before water injection equipment is installed in the drill hole. The invention further provides a coal bed gas extraction system using the drill hole branch wall pipe.

Description

technical field [0001] The invention relates to a branch wall pipe for coal seam drilling in the field of coal seam mining and a coal bed gas extraction system using the branch wall pipe. Background technique [0002] In the coal seam mining process, coalbed methane and coalbed dust generated during the mining process are the main safety hazards affecting mining. Both coalbed methane and coalbed dust are flammable and explosive, so controlling coalbed gas and coalbed dust is the key to safe mining. [0003] In the prior art, coal dust is generally controlled by coal seam water injection, and coal bed methane is controlled by early extraction. Coal seam water injection refers to injecting pressure water into the coal seam by using boreholes to pre-wet the coal seam before mining, thereby It can reduce the amount of coal dust generated during the mining process. In addition, water seeps into the coal seam and destroys the original balance in the coal seam, thereby helping to e...

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Problems solved by technology

[0004] Coal seam water injection and coal bed methane extraction generally need to drill holes in unexploited coal seams, and then insert water injection and coal bed methane extraction equipment into the drill holes. The existing problems of this technology are: for soft coal seams In other words, after drilling, before the equipment is installed in the drilling hole, the problem of hole collapse is prone to occur, resulting in the failure of the equipment to be normally loaded into the drilling hole, so that subsequent construction operations cannot be continued; in addition, the existing technology cannot Judging when the water injection is completed, it is impossible to judge when the water can completely infiltrate the coal seam. As a result, during the mining process, there will still be coal seams that have not been infiltrated by water, and a large amount of soot will still appear.

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