Area outburst-prevention method through blasting, water-injection and fracturing integration gas displacement

A displacement and regional technology, applied in the direction of gas discharge, mining fluid, earth drilling, etc., can solve the problems of difficult to guarantee the effect of gas drainage and the small degree of development of coal seam fissures, and achieve wide practicability, improve drainage effect, The effect of easy operation

Inactive Publication Date: 2019-01-18
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, for low-permeability coal seams, the development of coal seam fractures is relatively small, and the gas drainage effect is difficult to guarantee.

Method used

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  • Area outburst-prevention method through blasting, water-injection and fracturing integration gas displacement
  • Area outburst-prevention method through blasting, water-injection and fracturing integration gas displacement
  • Area outburst-prevention method through blasting, water-injection and fracturing integration gas displacement

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the embodiment in the accompanying drawings:

[0024] A regional outburst prevention method for blasting, water injection and fracturing integrated gas displacement of the present invention, the specific steps are as follows:

[0025] a. First determine the position of the pre-excavation roadway 3 in the coal seam 1, and then construct the auxiliary roadway 4 below or above the pre-excavation roadway 3;

[0026] b. Construct a row of detonation holes 5 from the auxiliary roadway 4 into the pre-excavation roadway 3; then construct two rows of partition holes 6 from the auxiliary roadway 4 to the left and right sides of the pre-excavation roadway 3, and the detonation holes 5 are layer-penetrating Drilling, passing through the rock formation 2 and passing through the coal seam 1 is not less than 0.5m; the auxiliary roadway 4 is a roadway high pumping roadway or a bottom pumping roadway; the interval...

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Abstract

The invention relates to an area outburst-prevention method through blasting, water-injection and fracturing integration gas displacement and belongs to an area blasting-prevention method for an underground coal mine. The method comprises the steps that a row of blasting injection holes are constructed on a pre-dug roadway from the interior of a bottom extraction roadway of the pre-dug roadway, then two rows of insulation holes are constructed at the two sides of the pre-dug roadway, the blasting injection holes are subjected to loosening blasting, water injection and hydraulic fracturing operation in sequence, a crack of a coal bed is quickly expanded through loosening blasting, and a flow channel is provided for the water flow and gas. Through a large amount of water flow injected duringfracturing operation, the gas in the coal bed can be displaced out, so that the gas is conveyed along a crack channel generated by blasting, when flowing nearby the insulation holes, the gas can be pumped out from the insulation holes, the gas pressure of the periphery of the pre-dug roadway can be effectively reduced, and the coal and gas outburst danger caused by the gas pressure of the coal bed is inhibited.

Description

technical field [0001] The invention relates to a regional outburst prevention method for blasting, water injection and fracturing integrated gas displacement, and is especially suitable for the prevention and control of coal and gas outburst and stress disasters during the tunneling process of coal seams with high gas and low permeability underground in coal mines. Background technique [0002] During the excavation process of underground coal roadways in coal mines, in order to prevent stress disasters mainly caused by coal and gas outburst, it is often necessary to drill through the coal seam below or above the coal seam to extract the gas in the coal seam. However, for low-permeability coal seams, the degree of development of coal seam fractures is small, and the gas drainage effect is difficult to guarantee. After adopting common gas drainage measures, the risk of coal and gas outburst during coal roadway excavation remains high. Therefore, it is necessary to find a hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21D9/00E21B43/26
CPCE21F7/00E21B43/26E21D9/006
Inventor 杨威王正林柏泉路长征林明华王皓
Owner CHINA UNIV OF MINING & TECH
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