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

A gas drainage, L-shaped technology, applied in the direction of gas discharge, earth drilling, mining equipment, etc., can solve the problems of gas exceeding the limit, strong mine pressure, etc., to solve the problem of poor gas drainage and reduce strong mine pressure Appearing effect

Inactive Publication Date: 2016-09-07
CHONGQING UNIV
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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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  • Gas extraction method for parallel hole arrangement of L-shaped drilling and fracturing weakening top plate
  • Gas extraction method for parallel hole arrangement of L-shaped drilling and fracturing weakening top plate
  • Gas extraction method for parallel hole arrangement of L-shaped drilling and fracturing weakening top plate

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] A gas drainage method for parallel arrangement of holes in a weakened roof by L-shaped drilling fracturing, comprising the following steps:

[0037] 1) On the ground corresponding to the working face of the coal seam to be mined, determine the drilling position and select the drilling parameters.

[0038] According to the up-and-down comparison map, corresponding to the ground position corresponding to the coal seam in the preparation work face, select a group of open, flat and convenient locations for construction to arrange L-shaped drilling holes. L-shaped drilling includes L-shaped fracturing drilling and L-shaped gas drainage drilling, L-shaped fracturing drilling and L-shaped gas drainage drilling include a straight hole section facing the coal seam roof and a horizontal section parallel to the coal seam roof , the straight hole section co...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21B43/26
CPCE21F7/00E21B43/26
Inventor 夏彬伟龚涛卢义玉王海洋葛兆龙汤积仁
Owner CHONGQING UNIV
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