A coal mining method based on hydrothermal coupling fracturing coal stone door

Abstract

According to the method for uncovering coal in stone gates based on hydrothermal coupling fracturing in the present invention, the main fracturing hole, the branch fracturing hole and the guide hole are sequentially constructed on the section of the rock formation roadway, and the main fracturing hole is arranged at the center of an equilateral triangle. , the opening positions of the branch fracturing holes are respectively arranged at the three vertices of the equilateral triangle, the terminal holes meet at the centerline of the equilateral triangle, the leading hole is located at the center of the main fracturing hole, and the radius The fracturing equipment consists of water injection equipment and powder injectors composed of intelligent water tanks and fracturing pumps. The quicklime powder in the powder injector is injected into the main fracturing hole and the branch fracturing hole through the downhole wind pressure; the main fracturing hole is hydraulically fractured through the water injection equipment, and the quicklime powder enters the fracture under the pressure of high-pressure water. The thermal reaction between powder and water generates a large amount of heat, which realizes hydrothermal coupling fracturing of coal body Shihmen and uncovering coal. Based on the method of hydrothermal coupling fracturing coal body Shihmen uncovering coal, the ground stress and gas pressure of the pre-exposed coal seam are reduced, the safety effect is remarkable, and the cost is low.

Description

technical field [0001] The invention relates to a method for uncovering coal at stone gates of coal bodies based on hydrothermal coupling fracturing, which belongs to the technical field of coal mining at underground coal mines, and is especially suitable for high-risk coal uncovering operations at deep high-gas outburst coal seams. 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 occurrence characteristics of high gassy and low permeability coal seams in my country are microporosity, low permeability and high adsorption. With the increase of mining depth, the amount of gas gushing out and the stress of the coal seam are getting bigger and bigger, which leads to the threat of coal and gas outburst when the coal is unearthed in Shimen is becoming more and more serious. Therefore, coal mines often need to carry out ...

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Problems solved by technology

[0003] For many years, my country's coal mines have been studying how to prevent the outburst of coal and gas when the coal is uncovered in Shimen, and try to eliminate the danger of coal outburst in Shimen. A series of measures such as holes and even coal mining and rock removal have been taken, but the phenomenon of coal mining in Shimen still occurs from time to time, and even the protrusion of different delay times has occurred, resulting in serious losses of property of coal mining enterprises.

The main reason is that the expansion of coal seam fissures is not sufficient before the traditional Shimen coal mining technology, and the regional fissure network has not been realized.

Moreover, after the implementation of the traditional hydraulic fracturing Shimen coal removal technology, the existence of moisture blocks the gas flow channel, which inhibits gas desorption, diffusion and penetration, resulting in insufficient pressure relief and permeability enhancement of the coal seam before Shimen coal removal. High stress and gas pressure, high gas content, high risk

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