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Coal seam gas method for gob-side entry retention and pre-drainage section of single low-permeability outburst coal seam

A technology for outburst coal seam and coal seam gas, which is applied in the field of gob-side entry retaining and pre-extraction section coal seam gas in a single low-permeability outburst coal seam, can solve the problems of large construction and large pressure of mine transportation and lifting system, and achieves increased production and savings. Gas extraction time, the effect of prolonging the gas extraction time

Inactive Publication Date: 2016-04-27
CHINA UNIV OF MINING & TECH
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AI Technical Summary

Problems solved by technology

This measure requires the construction of a large number of rock roadways, which puts a relatively large pressure on the mine transportation and hoisting system

Method used

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  • Coal seam gas method for gob-side entry retention and pre-drainage section of single low-permeability outburst coal seam

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Embodiment Construction

[0015] Such as figure 1 As shown, the single low-permeability protruding coal seam gob-side entry retaining and pre-pumping section coal seam gas method of the present invention includes digging out the air inlet trough 3 and the return air trough 2 in the coal mining area to form the working face 1, and A U-shaped working face is formed by excavating a cutout at the back of the working face 1, wherein the side of the return air trough 2 of the working face 1 is the unmined area 4, and the side of the air inlet trough 3 of the working face 1 is the adjacent working area Face 7; also includes the following steps:

[0016] a. On both sides of the air inlet trough 3 and the return air trough 2 in front of the coal mining face 1, drill multiple rows of overlapping bedding holes 6 in parallel along the coal seam inclination, and use a sealing pipe to align the bedding Borehole 6 is sealed and connected to the gas drainage pipe network for gas drainage;

[0017] b. Under the air ...

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Abstract

A coal seam gas drainage method for gobside entry retention and pre-drainage section of a single low-permeability outburst coal seam, which relates to the fields of mine support and gas drainage. On the air inlet chute and return air chute of the working face, drill multiple layers of boreholes along the coal seam in parallel to the working face, and use the pneumatic gas extraction device for gas drainage; under the transportation chute of the working face Drain the gas from the coal seam adjacent to the coal seam in the bedding borehole along the coal seam and connect it with the drainage pipeline to perform gas drainage from the coal seam in the area adjacent to the working face; after the drainage is completed, recover the coal seam in the working face; continue to drain Until the end, repeat the above steps until the mining of the coal seam is completed. It realizes coal pillar-free mining, improves coal recovery rate, saves the total gas drainage time, improves gas drainage effect, and realizes coal and gas co-mining.

Description

technical field [0001] The invention relates to a coal seam gas extraction method, in particular to a single low-permeability outburst coal seam gobside retaining and pre-extraction section coal seam gas method suitable for increasing the gas pre-extraction time in the protected section mining area. Background technique [0002] High gassy and low permeability coal seams are widely distributed in my country. For the occurrence conditions of coal seam groups, it is reasonable to choose protective layers with low gas content and controllable safety hazards for mining, and use the pressure relief and permeability enhancement effect caused by rock formation movement to fully desorb the adsorbed gas into free gas and implement drainage. Large-scale mining of coal seam groups on the basis of sufficient drainage is an effective method for preventing and controlling gas disasters in coal mines. At present, this method has been deeply promoted and applied in Huainan and other mining...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00E21C41/16
Inventor 王襄禹陈勇柏建彪徐营李学臣赵社会王猛
Owner CHINA UNIV OF MINING & TECH
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