Multifunctional gas extraction hole sealing method

Abstract

The invention provides a multifunctional gas extraction hole sealing method. The method comprises the following steps that a satellite hole grouting bag type hole sealing device is inserted into a preset hole sealing depth of a coal seam drill hole from front to back; grouting hole sealing operation is carried out on the hole opening of the drill hole through the satellite hole grouting bag type hole sealing device; an underground extraction system pipeline is connected, and gas extraction operation is carried out on the drill hole; if drill hole deformation is found and the gas concentration in the drill hole is remarkably reduced, hole sealing operation continues to be carried out until the grouting pressure is kept stable, and hole sealing is completed; and the gas concentration is reduced again in the later extraction process, hole sealing operation continues to be carried out until the drill holes of the grouting bag type hole sealing device in the length range are completely blocked, and final hole sealing is completed. The method is scientific in principle, simple in structure and convenient to operate, multiple purposes are achieved through one set of device, larger coal seam pressure can be resisted, the situation that an extraction pipe is pressed and damaged due to hole collapse deformation of a coal body is prevented, and normal extraction of drill hole gas in the whole extraction period is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of coal mine gas drainage, and in particular relates to a multifunctional gas drainage sealing method, which is used for grouting sealing, grouting plugging, water injection and dust reduction after the coal seam is drilled underground in a coal mine. Background technique [0002] Underground coal seam gas drainage in coal mines is the main means to solve the safety problem of coal mine gas. In the coal seam gas drainage drilling and sealing, the current sealing device has low compressive strength. The transfer of the stress concentration area to the deep part of the roadway will cause the deformation of the borehole. In the light case, it will cause air leakage in the drainage borehole. Some mines adopt closed drainage boreholes to deal with borehole air leakage, and some mines directly use drilling rigs to break the original sealing device and the sealing section along the drilling position to seal the hol...

AI Technical Summary

Problems solved by technology

[0002] Underground coal seam gas drainage in coal mines is the main means to solve the safety problem of coal mine gas. In the coal seam gas drainage drilling and sealing, the current sealing device has low compressive strength. The transfer of the stress concentration area to the deep part of the roadway will cause the deformation of the borehole. The light one will cause the drainage borehole to leak, and the serious one will directly flatten the drainage pipe, resulting in only concentration but no flow

Some mines adopt closed drainage boreholes to deal with borehole air leakage, and some mines directly use drilling rigs to break the original sealing device and the sealing section along the drilling position to seal the holes again. Such a cycle will not only directly affect the Improve the gas drainage efficiency and concentration in the later stage, and increase a lot of labor workload and capital cost

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