Gas extraction-water injection integrated under-pressure grouting hole sealing device and method

Abstract

The invention discloses a gas extraction-water injection integrated under-pressure grouting hole sealing device and method. The gas extraction-water injection integrated under-pressure grouting hole sealing device comprises an extraction pipe, an outer bag grouting pipe and a water injection hole sealing structure. A plurality of extraction pipe holes are formed in the top of the extraction pipe,extraction pipe outer bags are separately arranged outside the front end and the rear end of the extraction pipe, and inner bags are separately arranged inside the front end and the rear end of the extraction pipe. The outer bag grouting pipe is arranged outside the extraction pipe and penetrates through the inner part of the two extraction pipe outer bags. The water injection hole sealing structure is arranged in the extraction pipe in a sleeved mode, and the water injection hole sealing structure includes an inner bag grouting pipe and a water injection steel pipe. The gas extraction-water injection integrated under-pressure grouting hole sealing device and method can effectively utilize extraction drilling holes, and a bedding gas extraction hole is proposed to be used for injecting water in front of a working surface; on the one hand, the construction problem of water injection hole drilling can be solved, and a large amount of hole drilling construction costs are saved; on the other hand, the time and space contradiction of coal seam gas extraction and coal seam water injection can be solved; and water injection hole sealing is achieved on the basis of an extraction and hole sealing structure so as to achieve gas-water injection integrated hole sealing.

Description

technical field [0001] The invention relates to a gas drainage-water injection integrated pressure grouting sealing device and method, belonging to the field of coal mine safety. Background technique [0002] Coal mine dust and gas are two major disasters in mines. On the one hand, the production of coal mine dust can easily cause coal dust explosions in dry and geothermal environments, and on the other hand, it can also cause workers to suffer from pneumoconiosis, which seriously threatens the lives of workers. Physical and mental health. If the gas produced in the coal mining process accumulates beyond the limit, it will easily cause a gas explosion; and when the gas pressure and content in the coal seam are high, it will induce coal and gas outburst under the action of external disturbance. How to effectively prevent and control coal mine dust and gas is a hot issue concerned by scholars at home and abroad. [0003] At present, coal seam water injection to wet the coal ...

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Problems solved by technology

[0005] The object of the present invention is to provide a gas drainage-water injection integrated pressure grouting hole sealing device and method. The present invention can effectively utilize these drainage boreholes, and proposes to use bedding gas drainage holes for water injection in front of the working face On the one hand, it can solve the construction problem of water injection drilling and save a lot of drilling construction costs; on the other hand, it can also solve the space-time contradiction between coal seam gas drainage and coal seam water injection; Water injection to seal the hole to realize the problem of gas-water injection integrated hole sealing

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