Drilling and sealing method for gas drainage from coal seam

Abstract

The invention discloses a drilling and sealing method for gas drainage from a coal seam, and aims to ensure simple process, easy operation, high sealing depth and good sealing and insulating effect. The method comprises the following steps of: drilling in the coal seam with a drill according to drill-hole arrangement parameters of the coal seam; allowing a gas drainage tube to pass through a cylindrical cloth bag; fastening sticking buttons and snapping a snap ring at the two ends of the cylindrical cloth bag so as to fixedly connect the cylindrical cloth bag and the gas drainage tube together; unzipping the cylindrical cloth bag and uniformly and rapidly packaging a filler with expansion property into the cylindrical cloth bag; zipping the bag and rapidly feeding the cylindrical cloth bag in which the filler is packaged and the gas drainage tube together into the drill hole; automatically and completely blocking the drill hole after the filler in the cylindrical cloth bag is expanded; and connecting the gas drainage tube to a gas drainage pump for gas drainage.

Description

technical field [0001] The invention relates to a coal mine gas control method, in particular to a coal seam gas drainage drilling and sealing method. Background technique [0002] Coal seam gas drainage generally uses a gas pump to extract high-concentration gas from the coal seam, and drains the high-concentration gas to the ground through a pipe network isolated from the roadway. Coal seam gas drainage is an effective method to solve the gas gushing out of the working face and prevent the gas from exceeding the limit. The vast majority of coal seams in my country are low-permeability coal seams. Due to factors such as drilling sealing and gas leakage, the gas extraction concentration of most low-permeable coal seam mines in my country is too low, and the low-concentration gas is difficult to use or the utilization cost is too high, causing the gas extracted in most mining areas to be directly discharged into the air. empty. Not only cause waste of resources, but also po...

AI Technical Summary

Problems solved by technology

The coal seams in Yangquan Coal Mine Area, Shanxi Province generally have poor air permeability. The method of gas drainage is mainly used to seal holes with linen wrapped in polyurethane.

For example, the gas extraction concentration of mines such as Xinjing Mine, No. 1 Mine, and No. 2 Mine of Yangquan Coal Group is only about 5%-20%. The extraction concentration is too low, which not only affects the gas drainage effect, but also restricts the gas utilization in the Yangquan mining area.

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