Coal bed gas extraction hole drilling viscose liquid dynamic recyclable hole sealing device and coal bed gas extraction hole drilling viscose liquid dynamic recyclable hole sealing method

Abstract

The invention relates to the technical field of coal and gas exploitation, and discloses a coal bed gas extraction hole drilling viscose liquid dynamic recyclable hole sealing device. The coal bed gasextraction hole drilling viscose liquid dynamic recyclable hole sealing device is used for blocking orifice sections of drilled holes in a coal bed, and is characterized in that second ends of 3 high-pressure hoses are connected with an orifice expansion capsule, a hole tail-end expansion capsule and a blocking section, a dynamic grouting system is connected with first ends of the 3 second high-pressure hoses in a switchable manner, and blocking adhesive can be injected into the orifice expansion capsule, the hole tail-end expansion capsule or the blocking section by the dynamic grouting system; the outer walls of the orifice expansion capsule and the hole tail-end expansion capsule are elastic walls, the orifice expansion capsule and the hole tail-end expansion capsule can be expanded after the blocking adhesive is injected, gaps between the inner walls of the drilled holes and the outer wall of a hole sealing pipe further can be blocked, and gaps between the inner walls of the drilled holes and the outer wall of the hole sealing pipe can be filled after the blocking adhesive is injected into the blocking section. The invention further provides a coal bed gas extraction hole drilling viscose liquid dynamic recyclable hole sealing method.

Description

technical field [0001] The invention relates to the technical field of coal and gas mining, in particular to the coal seam gas drainage drilling plugging technology. Background technique [0002] As coal resources in shallow low-gas areas are gradually exhausted, underground coal mines will extend to high-gas areas of coalfields. Document No. 163 [2011] "Provisional Provisions on Reaching the Standards of Coal Mine Gas Drainage" clearly stipulates the mandatory provisions for meeting the standards of gas drainage in coal seams. [0003] The gas drainage technology of the coal seam in high-gas mines is an important technical means to reduce the gas gushing out of the working face during the mining period. For the polyurethane sealing method and the "two plugging and one injection" sealing method, the sealing materials are mainly cement mortar and polyurethane. Infiltrate into the micro-cracks around the borehole; these hole sealing methods all have the problem that after th...

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Problems solved by technology

[0003] The gas drainage technology of the coal seam in high-gas mines is an important technical means to reduce the gas gushing out of the working face during the mining period. For the polyurethane sealing method and the "two plugging and one injection" sealing method, the sealing materials are mainly cement mortar and polyurethane. Infiltrate into the micro-cracks around the borehole; these hole sealing methods all have the problem that after the coal seam drilling is sealed and extracted, the gas leakage in the cracks cannot be remedied by secondary sealing, and the sealing material and the drainage pipe in the coal seam drilling cannot be remedied. recycling problem

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