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<p>Controlled electrical pulse (CEP) technology has significant application potential in coal seam permeability enhancement, while the coupled effects of multiple fields are rarely considered in existing experiments, leading to poor engineering applicability of experimental results. Therefore, a thermo-fluid–solid coupling seepage experimental system of coal rock cracked by CEP was developed, which consists of a discharge module, thermo-fluid–solid coupling seepage module, and data acquisition module. This experimental system can provide the maximum axial pressure of 200 MPa, the maximum confining pressure of 20 MPa, and the maximum temperature of 120 °C, and can also perform in situ permeability testing of coal and microsecond-level electrical signal acquisition. Then the experiments of coal cracked by CEP were conducted under multi-field coupling. The results indicate that aromaticity (<i>f</i><sub>a</sub>), aromatic hydrogen ratio (<i>f</i><sub>H</sub>), aromatic condensation degree (<i>D</i><sub>C</sub>), and infrared structural index (<i>IR</i>) of cracked coal all decrease compared with raw coal, which is conducive to the rapid migration of gas. The mesopore and macropore volume of cracked coal increase by 65.12% and 40.65%, respectively, with its pore structure improved. The permeability of cracked coal significantly increases with the rise in breakdown voltage and temperature, and decreases with the increase in axial pressure, confining pressure, and gas injection pressure. This study provides a physical simulation experimental system to advance the industrial application of CEP technology.</p>

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Development and Application of Thermo-Fluid–Solid Coupling Seepage Experimental System of Coal Rock Cracked by Controlled Electric Pulse

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Fazhi Yan,
  • Changjiong Gao,
  • Wei Yang,
  • Jiang Xu,
  • Shoujian Peng,
  • Tao Zeng,
  • Yihan Wang,
  • Ziwen Li

摘要

Controlled electrical pulse (CEP) technology has significant application potential in coal seam permeability enhancement, while the coupled effects of multiple fields are rarely considered in existing experiments, leading to poor engineering applicability of experimental results. Therefore, a thermo-fluid–solid coupling seepage experimental system of coal rock cracked by CEP was developed, which consists of a discharge module, thermo-fluid–solid coupling seepage module, and data acquisition module. This experimental system can provide the maximum axial pressure of 200 MPa, the maximum confining pressure of 20 MPa, and the maximum temperature of 120 °C, and can also perform in situ permeability testing of coal and microsecond-level electrical signal acquisition. Then the experiments of coal cracked by CEP were conducted under multi-field coupling. The results indicate that aromaticity (fa), aromatic hydrogen ratio (fH), aromatic condensation degree (DC), and infrared structural index (IR) of cracked coal all decrease compared with raw coal, which is conducive to the rapid migration of gas. The mesopore and macropore volume of cracked coal increase by 65.12% and 40.65%, respectively, with its pore structure improved. The permeability of cracked coal significantly increases with the rise in breakdown voltage and temperature, and decreases with the increase in axial pressure, confining pressure, and gas injection pressure. This study provides a physical simulation experimental system to advance the industrial application of CEP technology.