Reinforced gas extraction method based on phase change pulse wave

Abstract

The invention discloses a reinforced gas extraction method based on a phase change pulse wave. The method comprises the following steps of: firstly, constructing phase change cracking holes on the roadway side of a vertical coal seam, respectively constructing pulse induction holes at 10m positions of the two ends of the phase change cracking holes, arranging phase change cracking pipes in the phase change cracking holes, arranging a gas extraction pipe and a pulse sensor in the pulse induction holes, connecting the pulse sensor with a monitoring station, connecting the phase change cracking pipes with a liquid carbon dioxide storage station through a pressure reducer, connecting the pressure reducer with a pulse frequency modulator through a cable, changing a liquid carbon dioxide phase into gaseous carbon dioxide by controlling the pressure reducer, entering the gaseous carbon dioxide into the phase change cracking holes to crack the coal seam to generate a crack, controlling the pulse wave frequency modulator, so that the gaseous carbon dioxide generates a pulse effect and the gaseous carbon dioxide generates pulse wave crack on the coal seam, and realizing the reinforced gas extraction based on the phase change pulse wave. Through the reinforced gas extraction method based on the phase change pulse wave, the gas desorption amount is large, the gas extraction effect is obvious, the success rate is high, the cost is low, and the needs of gas control and other work in a coal mine field area are met.

Description

technical field [0001] The invention relates to an enhanced gas drainage method based on phase-change pulse waves, which belongs to the technical field of gas control in underground areas of coal mines, and is especially suitable for gas drainage 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. As mining depth increases, in-situ s...

AI Technical Summary

Problems solved by technology

[0004] Technical problem: The purpose of this invention is to provide a fracturing-affected area with large gas desorption capacity and obvious gas drainage effect in view of 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

Images