An Enhanced Gas Drainage Method Based on Phase Change Pulse Wave

Abstract

The invention discloses an enhanced gas drainage method based on phase-change pulse waves. First, phase-change fracturing holes are constructed vertically to the side of the coal seam roadway, and pulse induction holes are respectively constructed at 10m positions at both ends of the phase-change fracturing holes. The phase change fracturing tube is arranged inside, and the gas drainage tube and pulse sensor are arranged in the pulse induction hole. The pulse sensor is connected to the monitoring station, and the phase change fracturing tube is connected to the liquid carbon dioxide storage station through a pressure reducer. Connected with the pulse frequency modulator, the liquid carbon dioxide is changed into gaseous carbon dioxide by controlling the pressure reducer, and the gaseous carbon dioxide enters the phase change fracturing hole to crack the coal seam and generate cracks. By controlling the pulse wave frequency modulator, the gaseous carbon dioxide produces a pulse effect , making gaseous carbon dioxide pulse wave fracturing on the coal seam, realizing enhanced gas drainage based on phase change pulse wave. Through the enhanced gas drainage method based on the phase change pulse wave, the gas desorption amount is large, the gas drainage effect is obvious, the success rate is high, and the cost is low, which meets the needs of the coal mine field area gas control and other work.

Description

technical field [0001] The invention relates to an enhanced gas extraction method based on a phase-change pulse wave, which belongs to the technical field of gas control in underground areas of coal mines, and is especially suitable for gas extraction operations in water-bearing 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, which often lead to a large amount of gas gushing out during the mining process, especially with the efficient intensification of coal production and the increase in mining depth. The amount of gas gushing out is increasing, and the threat of gas explosion and gas outburst is becoming more and more serious. With the increase of mining dep...

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Problems solved by technology

[0004] Technical problem: The purpose of the present invention is to provide a fracturing-affected area with large gas desorption capacity and obvious gas drainage effect for the deficiencies of the existing enhanced gas drainage technology in high-gas and low-permeability water-bearing coal seams. An enhanced gas drainage method based on phase change pulse wave with high success rate and low cost

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