High-gas coal bed group dip orientation drilling cluster and gas extracting method

Abstract

The invention discloses a high-gas coal seam group inclination directional drilling cluster and a gas extraction method, which mainly consists of a transport lane, an air return lane, an inclination directional bendable drilling cluster and a drilling field. It is characterized in that a group of drilling sites are respectively constructed in the transportation lane and the air return lane of the working face of the coal seam, and a cluster of roof inclined and oriented bendable drilling holes and a cluster of bottom plate inclined and oriented bendable drilled holes are respectively constructed in each drilling site. Each cluster of boreholes is composed of 4 inclination-oriented bendable boreholes. After the borehole construction is completed, the holes are sealed, and gas drainage pipelines are installed in each borehole, and then merged into the gas drainage of the return airway and the transportation roadway respectively. The system pipeline is used to drain the gas released from the coal seam. The invention has the characteristics of short construction time, easy construction, low construction cost and large extraction range, and can improve the extraction efficiency of pressure-relieving gas in high-gas coal seam groups, especially the extraction of gas in gas-enriched areas in fracture zones.

Description

technical field [0001] The invention relates to a gas drainage drilling arrangement method and a gas drainage method of a high gas coal seam group, in particular to a high gas coal seam group inclination directional drilling cluster and a gas drainage method. Background technique [0002] There are high gassy coal seam groups in many mining areas in my country, and gas disaster is one of the most difficult disasters faced in the mining process of high gassy coal seam groups. In recent years, gas disaster accidents account for the highest proportion of coal mine accidents, and the prevention and control of gas disaster accidents is the top priority of mine safety work in high gas coal seam groups. With the increase of coal mining intensity and mining scale, the degree of pressure relief of coal seams during the mining of high-gas coal seam groups has been increased, increasing the release of pressure relief gas from high-gas coal seams, and the pressure relief gas will flow a...

AI Technical Summary

Problems solved by technology

With the increase of coal mining intensity and mining scale, the degree of pressure relief of coal seams during the mining of high-gas coal seam groups has been increased, increasing the release of pressure relief gas from high-gas coal seams, and the pressure relief gas will flow along the rock formations. The cracks and cracks migrate and spread, and accumulate in the upper corner of the working face and the crack area of ​​the pressure-relieving rock formation, resulting in gas exceeding the limit in the upper corner and working face, which easily induces gas disasters and threatens the life safety of coal mine workers. Safe and efficient mining of high gassy coal seam groups

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