Low-gas-permeability coal seam pressure-releasing and gas-extraction method

A technology of gas drainage and gas permeability, which is applied in the direction of gas discharge, mining equipment, earthwork drilling, etc., can solve the problems of heavy drilling construction workload, small effective drilling range and low drainage efficiency in the working face, etc. Achieve the effect of increasing the effective influence range, good extraction effect and high extraction efficiency

Inactive Publication Date: 2018-07-24
XIAN UNIV OF SCI & TECH
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Problems solved by technology

However, these methods all have the problems of small effective impact range of drilling, heavy drilling construction workload on the working face, and low extraction efficiency.

Method used

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  • Low-gas-permeability coal seam pressure-releasing and gas-extraction method

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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0018] see figure 1 , the present invention provides a technical solution: a method for pressure relief gas drainage in low-permeability coal seams. The specific steps of the method are as follows:

[0019] S1: Multiple drilling sites are arranged on the stable roof of the coal yard, and the drilling site is 70-80m away from the working face, the distance between each drilling site is 50-70m, the drilling site is 4-5m wide, and the depth is 3-4m;

[0020] S2:...

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Abstract

The invention discloses a low-gas-permeability coal seam pressure-releasing and gas-extraction method in the technical field of coal mining. The low-gas-permeability coal seam pressure-releasing and gas-extraction method comprises the following specific steps that S1, a plurality of drill sites are arranged on a stable top plate of a coal field; S2, six double-position drill holes are formed in each drill site; S3, in the drilling process of the double-position drill holes, upper high-position drill hole end holes of each set of high-position drill holes are away from the top plate by 30-40 m,and lower high-position drill hole end holes of each set of high-position drill holes are away from the top plate by 20-30 m; S4, coal seam and gas are subjected to pressure-releasing and extractionfrom the lower portions of extraction pipes to the interiors of hole sealing pipes inside the excavated drill holes; and S5, the contact positions of the extraction pipes and the drill holes are sealed through polyurethane. The double-position drill hole gas extraction technology is adopted, the extraction efficiency of the method is high, meanwhile the effective influence range of the drill holesis extended, the gas permeability of coal bodies is improved, the good condition is created for coal beam interior pressure releasing and gas releasing and flowing, and the low-gas-permeability coalseam pressure-releasing and gas-extraction method is easy to operate and good in extraction effect, and has wide practicability.

Description

technical field [0001] The invention discloses a pressure-relieving gas extraction method for a low-permeability coal seam, and specifically belongs to the technical field of coal mining. Background technique [0002] The mining of high-gassy and low-permeability coal seams is often accompanied by a large amount of gas gushing out, especially with the efficient intensification of coal production and the increase of mining depth, the amount of gas gushing out is increasing, and gas explosions and gas outbursts are dangerous. The threat is becoming more and more serious, and gas disasters have become the most important factor restricting the development of efficient and intensive mining technology and safe production. Therefore, how to effectively solve the problem of gas gushing in the process of mining high-gas coal seams is of great significance to the safe production of coal mines. [0003] To solve the problem of gas gushing in the process of mining high-gas and low-perm...

Claims

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Application Information

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IPC IPC(8): E21F7/00
CPCE21F7/00
Inventor 肖鹏
Owner XIAN UNIV OF SCI & TECH
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