Gob-side entry retaining and sectional coal seam gas pre-extracting method for single low-permeability outburst coal seam

A technology for protruding coal seam and permeability, applied in gas discharge, earth-moving drilling, safety devices, etc., can solve the problems of large construction and high pressure of mine transportation and lifting system, so as to improve production, save gas extraction time, and prolong gas The effect of draining time

Inactive Publication Date: 2014-03-26
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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  • Gob-side entry retaining and sectional coal seam gas pre-extracting method for single low-permeability outburst coal seam

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Experimental program
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Embodiment Construction

[0015]

[0016] Such as figure 1 As shown, the single low-permeability protruding coal seam gobside entry retaining and pre-pumping section coal seam gas method of the present invention includes digging out the wind-inflow groove 3 and the wind-return groove 2 in the coal mining area to form the working face 1, And excavate the cut hole behind the working face 1 to form a U-shaped working face, in which the side of the wind trough 3 of the working face 1 is the unmined area 4, and the side of the return air trough 2 of the working face 1 is the adjacent working face 7; also includes the following steps:

[0017] 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 the sealing pipe to align the bedding Borehole 6 is sealed and connected to the gas drainage pipe network for gas drainage;

[0018] b. Under the wind troug...

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Abstract

The invention relates to the field of mine support and gas extraction, in particular to a gob-side entry retaining and sectional coal seam gas pre-extracting method for a single low-permeability outburst coal seam. A plurality of bedding drill holes are drilled in an air inlet crossheading and an air return crossheading of a working surface towards the working surface in the inclined direction of the coal seal in a parallel mode, and a pneumatic gas extraction device is used for carrying out gas extraction; gas of an adjacent working surface is extracted along the inclined bedding drill holes of the coal seam in the downstream direction of a transportation crossheading of the working surface, and an extraction pipeline is communicated for extracting gas of the coal seam of the adjacent working surface; after extraction, robbing is carried out on the coal seal of the working surface; extraction is not stopped until finish, and the steps are repeated until extraction of the coal seam is finished. According to the method, coal mining without pillars is achieved, the recovery rate of coal is improved, the total gas extraction time is saved, the gas extraction effect is improved, and coal mining and gas extracting are achieved at the same time.

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 Applications(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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