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Rock cross-cut coal uncovering method based on gas injection displacement enhanced electric pulse fracturing

A Shimen unraveling coal, electric pulse technology, applied in the direction of drilling equipment and methods, earthwork drilling, mining fluid, etc., can solve the problems of insignificant effect, affecting the safe production and mining operations of coal mines, long time for unraveling coal, etc., to achieve safety Significant effect, extensive practical value, and safety-enhancing effect

Inactive Publication Date: 2020-08-11
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing methods for uncovering coal in Shimen mainly include hydraulic punching, hydraulic fracturing, and other reinforcement methods such as grouting and metal framework. Significant and other defects seriously affect the safe production and normal mining operations of coal mines

Method used

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  • Rock cross-cut coal uncovering method based on gas injection displacement enhanced electric pulse fracturing
  • Rock cross-cut coal uncovering method based on gas injection displacement enhanced electric pulse fracturing

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Embodiment Construction

[0020] An embodiment of the present invention will be further described below in conjunction with the accompanying drawings:

[0021] Such as figure 1 As shown, the method for uncovering coal in Shimen based on gas injection displacement and enhanced electric pulse fracturing of the present invention, the specific steps are as follows:

[0022] S1. On the roadway section 3 of the rock formation 1 whose normal distance from the coal seam 2 is not less than 7m, the conventional drilling method is used to construct the positive electrode drilling 4 and the negative electrode drilling 5, such as figure 2 As shown, the boreholes are alternately arranged, the hole spacing before the positive electrode borehole 4 and the negative electrode borehole 5 is 3m, and the tops of the positive electrode borehole 4 and the negative electrode borehole 5 respectively pass through the coal seam roof by 3m;

[0023] S2. Install the exhaust pipe 14 and the positive electrode 8 in the positive el...

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Abstract

The invention discloses a cross-cut coal uncovering method based on gas injection displacement enhanced electric pulse fracturing. The method comprises the following steps that positive electrode drill holes and negative electrode drill holes are firstly alternately constructed in a rock stratum roadway section which is not less than 7 m away from a coal seam in the normal direction, then gas injection devices and negative electrodes are installed in the negative electrode drill holes, and extraction devices and positive electrodes are installed in the positive electrode drill holes; and a high-voltage electric pulse device is used for performing repetitional discharge on the coal seam, a fracture structure of a spatial network is formed in the coal seam, free mashgas is released, gas capable of displacing the mashgas is injected into the coal seam through a gas injection system, and the mashgas in pores of the coal seam is then desorbed. By combining the advantages of electric pulse fracturing and the displacement effect, the mashgas pressure and the ground stress in the cross-cut coal uncovering process can be effectively reduced, the method is safer and more efficient than an existing coal uncovering method, and the requirement of underground construction can be met.

Description

technical field [0001] The invention relates to a method for uncovering coal in Shimen based on gas injection displacement enhanced electric pulse fracturing, which belongs to the technical field of coal seam Shimen uncovering in the underground area of ​​coal mines, and is especially suitable for coal seams with high adsorption, difficult desorption and low gas permeability in underground coal mines Shimen mining operation. Background technique [0002] In recent years, with the deepening of coal mine mining, problems such as high gas, low air permeability, and difficult desorption have become increasingly prominent in the process of coal mining, and the problem of coal and gas outburst is particularly serious. The coal uncovering operation is the most dangerous, and the coal uncovering takes a long time, which is a "blocker" in the safe production of coal mines. Existing methods for uncovering coal in Shimen mainly include hydraulic punching, hydraulic fracturing and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18E21F7/00E21B7/00E21B43/26E21B43/16E21B43/34E21B17/00
CPCE21B7/00E21B17/003E21B43/164E21B43/168E21B43/26E21B43/34E21C41/18E21F7/00
Inventor 刘厅张祥良林柏泉
Owner CHINA UNIV OF MINING & TECH
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