Gas extraction method for parallel hole arrangement of L-shaped drilling and fracturing weakening top plate

Abstract

The invention relates to a gas extraction method for parallel hole arrangement of an L-shaped drilling and fracturing weakening top plate. The gas extraction method comprises the following steps: firstly, determining drilling positions and selecting drilling parameters on the ground corresponding to a working face of a coal mining seam; secondly, performing L-shaped fracturing drilling and L-shaped gas extraction drilling construction; thirdly, after the L-shaped fracturing drilling construction is finished, arranging a casing pipe and fracturing equipment in an L-shaped drilling hole; fourthly, after the L-shaped gas extraction drilling construction is finished, arranging a gas extraction pipe with air holes in L-shaped gas extraction drilling hole; fifthly, performing fracturing in advance on a coal seam top plate by using a hydraulic jet staged fracturing method; sixthly, extracting fissure zone gas by the gas extraction pipe while performing coal mining operation. According to the scheme, the problems of high mine pressure behavior and transfinite fissure zone gas in a goaf in a coal mining process in the prior art are solved.

Description

technical field [0001] The invention relates to the field of gas drainage, in particular to a gas drainage method in which holes are arranged in parallel to a weakened roof by L-shaped drilling and fracturing. Background technique [0002] With the development of industrialization in our country, the demand for energy is increasing day by day, and the amount of resource exploitation is increasing day by day. People have begun to ask for resources from deeper strata. As far as coal mines are concerned, the current overall development trend is that the resources of shallow mines are being exhausted, the resources of medium-deep mines are being vigorously exploited, the amount of resources extracted from deep mines has doubled, and there will be more ultra-deep mines with a depth of more than 1200m. However, with the increase of mining depth, the problem of strong mine pressure and gas drainage seriously restricts the safe production of coal mines, and consumes a lot of manpowe...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a gas drainage method in which L-shaped drilling and fracturing weaken the roof with parallel holes, which can solve the problem of strong mine pressure appearing in the coal mining process in the prior art and the gas in the fissure zone of the goaf Overrun problem

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