Drilling, cutting, pressing and pumping method

A drilling cutting and drilling rig technology, which is used in earth-moving drilling, gas discharge, safety devices, etc., can solve the problems of small effective impact range of drilling, large drilling workload, and poor coal seam permeability, and achieve safe drainage. , Fast drain, and the effect of increasing the gas drain rate

Active Publication Date: 2014-04-02
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, high-gassy and low-permeability coal seams have poor air permeability, and conventional drainage is difficult and ineffective, so technical measures for pressure relief and permeability enhancement are required
Conven

Method used

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  • Drilling, cutting, pressing and pumping method
  • Drilling, cutting, pressing and pumping method

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Embodiment Construction

[0019] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0020] Drilling, cutting, pressing and pumping method of the present invention, concrete steps are as follows:

[0021] a. First, use a drilling rig to drill a drill hole 7 to the design depth in the coal seam 2 in front of the coal mining or driving face;

[0022] b. Exit the drill pipe, replace the hydraulic slitting drill bit and continue drilling until reaching the bottom of the borehole, and retreat the drill pipe to perform hydraulic slitting at intervals to form multiple annular main cracks 5 in the borehole; perform hydraulic slitting at the intervals The time is 20 minutes; the coal body is artificially disturbed through the slit to form a space for pressure relief and permeability enhancement, and improve the air permeability of the coal seam;

[0023] c. After the hydraulic cutting is completed, the opening of the drill hole 7 is blocked. The le...

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Abstract

The invention provides a drilling, cutting, pressing and pumping method which is suitable for gas extraction of coal seams which are high in gas and low in gas permeability. The drilling, cutting, pressing and pumping method comprises punching a drill hole according to the design requirements through a drilling machine; replacing a hydraulic seam cutting drill bit after a drill rod is withdrawn, continuing to drill to the bottom of the drill hole and withdrawing the drill rod to perform hydraulic seam cutting; sealing the drill hole and performing gas drainage after the hydraulic seam cutting is achieved; switching a drainage pipeline into a pulse water injection pump station when the gas drainage capacity is in the attenuation trend and fracturing the coal seams in a pulse hydraulic fracturing mode. According to the drilling, cutting, pressing and pumping method, the effective influence range of a single hole of gas extraction drilling of the coal seams can be increased by more than 30%, the gas flow of the single hole can be improved by more than 30%, the gas extraction rate can be improved by more than 20%, the operation is simple, the influence range of drilling pressure relief can be improved, and the concentration and the efficiency of the gas extraction of the drilling can be improved.

Description

technical field [0001] The invention relates to a method of drilling, cutting and pressure pumping, which is particularly suitable for gas pumping of high-gas and low-permeability coal seams in underground coal mines. Background technique [0002] The geological conditions of my country's coal mines are complex, high-gas coal seams account for 50-70%, and high-gas low-permeability coal seams account for about 70% of them. The mining of high-gassy and low-permeability coal seams is often accompanied by a large amount of gas gushing, especially with the efficient intensification of coal production and the increase of mining depth, the amount of gas gushing is increasing, and the threat of gas explosion and gas outburst is also increasing. Gas disasters have become the most important factor restricting the development of intensive mining technology and safe production in colleges and universities. Therefore, how to solve the problem of gas gushing in the process of mining high...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 林柏泉刘谦朱传杰江丙友孙豫敏洪溢都郭畅
Owner CHINA UNIV OF MINING & TECH
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