Experimental method for fracturing gas-containing coal body through multi-field coupling controllable shock waves

Abstract

The invention relates to the technical field of coal bed gas (mine gas) exploitation, and particularly relates to an experimental method for fracturing a gas-containing coal body through multi-field coupling controllable shock waves; the experimental method comprises the following steps: step a, a coal sample is prepared, and a drilling hole is pre-formed in the coal sample, wherein a liquid withcertain pressure is injected into the drilling hole; step b, a high-power pulse generating mechanism is installed, and the high-power pulse generation mechanism is connected with the drilling hole through a wire; step c, a shock wave detection mechanism is installed; step d, the high-power pulse generation mechanism emits high-power pulses to the liquid in the drilling hole, a shock wave is formedin the liquid, and the coal sample is fractured; and step e, the shock wave detection mechanism is used for detecting and analyzing the shock wave characteristics in the coal sample. The beneficial effects of the invention are that the pulse energy needed when the fracturing effect of the coal body is relatively good can be determined, the shock wave characteristics and shock wave-acted coal bodydamage failure rule are researched, so that numerical calculation analysis is carried out on the law of the shock wave fractured coal body with different waveforms and energy.

Description

technical field [0001] The invention relates to the technical field of coal bed methane (mine gas) exploitation, in particular to an experimental method for cracking gas-containing coal bodies by multi-field coupling controllable shock waves. Background technique [0002] In recent years, with the development of science and technology, my country has made a breakthrough in the development of coal seams. As my country's coal demand increases year by year, the mining of coal seams in my country has gradually shifted to the deep. Deep coal seams have high gas pressure and high gas content, which easily lead to coal and gas outburst dynamic disasters in the mine production process. In order to prevent coal and gas outburst disasters and ensure safe production, it is necessary to drain the gas in the coal seam before mining the coal seam. However, the gas permeability of deep coal seams is generally low, so gas drainage is more difficult. In order to reduce the difficulty of ga...

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