Gas extraction drilling hole sealing device and method

Abstract

The invention provides a gas extraction drilling hole sealing device and method. The hole sealing device comprises a cloth bag (3), a front chuck (2), a rear chuck (4) and an extraction pipe (6). The cloth bag (3) is made from an elastic thin-wall cellular material. The two ends of the cloth bag (3) are separately fixed to the front chuck (2) and the rear chuck (4). The two ends of the extraction pipe (6) separately penetrate through the front chuck (2) and the rear chuck (4). The front chuck (2) is fixedly connected with the extraction pipe (6), and the rear chuck (4) is slidably connected with the extraction pipe (6) and provided with an axial grouting pipe spigot (12). The hole sealing device is rapidly connected with a gas extraction pipe in a construction site, a hole sealing material is injected into the cloth bag (3) and later expands and seeps out of the cloth bag (3) to fill cracks around a drilling hole, sealing supporting is formed for the drilling hole, and gas leakage of the cracks around the drilling hole is also prevented. The gas extraction drilling hole sealing device and method are easy to operate, economical, environmentally friendly and good in safety.

Description

technical field [0001] The invention relates to a hole sealing device and a hole sealing method, in particular to a coal mine gas drainage drilling hole sealing device and a hole sealing method, belonging to the technical field of coal mine gas control. Background technique [0002] Gas disasters seriously threaten the safe production of mines. At present, the most effective measure to prevent and control underground gas disasters in coal mines is gas drainage, and more than 95% of high-gas and outburst mines in my country belong to low-permeability coal seams, and their permeability coefficient is only 10. -3 ~10 -4 mD, poor air permeability of coal seam, combined with the current lack of strict sealing of gas drainage boreholes, resulting in serious gas leakage during the drainage process, rapid decay of gas drainage concentration in boreholes, difficulties in gas drainage, and low gas drainage efficiency are prominent problems in China. Common technical problems in mine...

AI Technical Summary

Problems solved by technology

At present, the most effective measure to prevent and control underground gas disasters in coal mines is gas drainage, and more than 95% of high-gas and outburst mines in my country belong to low-permeability coal seams, and their permeability coefficient is only 10. -3 ~10 -4 mD, poor air permeability of coal seam, combined with the current lack of strict sealing of gas drainage boreholes, resulting in serious gas leakage during the drainage process, rapid decay of gas drainage concentration in boreholes, difficulties in gas drainage, and low gas drainage efficiency are prominent problems in China. Common Technical Difficulties in Mine

[0003] At present, the sealing technologies of my country's coal mine gas drainage drilling mainly include: cement mortar sealing, polyurethane sealing, mine sealing device sealing, etc. These technologies have been popularized and applied in a certain period of time, but there are certain deficiencies. For example, when cement mortar seals horizontal or near-horizontal holes, due to gravity, a gap is formed between the mortar sedimentation and the drilled hole, and the sealing effect is not good; the polyurethane sealing material has a fast reaction time, and it is easy to cause material waste and environmental pollution during operation. Expensive; hole sealer has limited sealing depth, etc.

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