With the significant development of coal mining, complex coal reservoir environments with a high gas content, high stress, and low permeability increase the difficulty in efficient and large-scale extraction of gas. To further study the mechanism of coal–rock fracturing using a high-voltage electric pulse (HVEP) and to determine the influence of the HVEP on the permeability enhancement, a multi-field coupling HVEP fracturing coal–rock permeability enhancement test device was independently developed. The device mainly includes a servo loading and control system, high-voltage charging system, energy storage system, and data acquisition system. Considering the coupling effects of the electric field, in-situ stress field, and seepage field, this paper proposes the HVEP fracturing technology. The test device can provide an axial pressure of 50 MPa, confining pressure of 16 MPa, and seal gas pressure of 5 MPa with high insulation, which can simulate the permeability enhancement of deep coal–rock due to the application of an HVEP. The device realizes the real-time monitoring of voltage, current, in-situ stress, and gas flow during the HVEP fracturing of coal–rock. The experimental device was used to carry out an HVEP fracturing coal–rock permeability enhancement test. The dynamic response characteristics of the voltage, current, pore, fractures, and permeability during the coal–rock breakdown were analyzed. This study provides a novel laboratory physical simulation technology for the large-scale extraction of gas.

随着煤炭开采的显着发展，高含气量、高应力、低渗透率的复杂煤储层环境增加了瓦斯高效、规模化开采的难度。为进一步研究高压电脉冲（HVEP）煤岩压裂机理，确定HVEP对增渗的影响，自主研发了多场耦合HVEP压裂煤岩增渗试验装置。 . 该装置主要包括伺服加载与控制系统、高压充电系统、储能系统, 和数据采集系统。考虑电场、地应力场和渗流场的耦合效应，提出了HVEP压裂技术。该试验装置可提供50 MPa的轴向压力、16 MPa的围压和5 MPa的密封气体压力，具有高绝缘性，可以模拟HVEP对深层煤岩渗透性的增强。该装置实现了煤岩HVEP压裂过程中电压、电流、地应力、气体流量的实时监测。该实验装置用于进行HVEP压裂煤岩增渗试验。分析了煤岩破碎过程中电压、电流、孔隙、裂缝和渗透率的动态响应特性。