Large-diameter directional long drill hole extraction method for mining body gushing out of gas roof

A long-drilling, large-diameter technology, applied in the fields of mining fluids, gas discharge, mining equipment, etc., can solve the problems of affecting the release of high-yield potential, low efficiency, large engineering volume, etc., to improve the scope of application, reduce gas concentration, improve The effect of extraction success rate

Active Publication Date: 2019-05-10
CHINA COAL TECH ENG GRP CHONGQING RES INST
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AI Technical Summary

Problems solved by technology

[0002] With the increase of the mining intensity and coal seam depth of the working face, the amount of gas gushing out from the mining-affected body (referred to as the mining body) near the working face increases sharply. Hole drainage, etc.) has a large amount of work and low efficiency, which serious

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Example Embodiment

[0041] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0042] Such as figure 1 As shown, the large-diameter directional long borehole drainage method for gas gushing from the mining body of the present invention specifically includes the following steps:

[0043] S1: Calculate and determine the basic parameters of large-diameter directional long holes on the roof, including the longitudinal height of the hole layout area, the number of holes, the selection of horizontal section drilling horizons and the spatial layout, drilling sites and drilling parameters;

[0044] (1) Determine the longitudinal height of the hole area

[0045] In order to effectively control the upper corner gas, the long-draining borehole should be arranged in the roof rock near the return air tunnel of the working face. In order to ensure the drainage effect, the horizontal section of the borehole needs to be arranged in the

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Abstract

The invention relates to a large-diameter directional long drill hole extraction method for a mining body gushing out of a gas roof, and belongs to the technical field of coal mining. The method comprises the following steps: S1, calculating and determining basic parameters of the large-diameter directional long drill hole of the roof; S2, before working face stoping, drilling to a coal seam roofrock stratum at a large-dip-angle upward pitching; and S3, gradually adjusting the drilling angle through the orientation technology so that the horizontal section of the drilled hole is arranged in the advancing direction of the working face, and then gas extraction is completed. The roof large-diameter directional long drill hole extraction success rate can be increased, the gas concentration ofa working face is reduced, the safety coefficient of the operation environment is increased, and economic benefits are increased.

Description

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Claims

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Application Information

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Owner CHINA COAL TECH ENG GRP CHONGQING RES INST
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