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<p>This study develops a coupling model to investigate the multi-mode coupled heat transfer and damage evolution in coal reservoir during liquid nitrogen (LN<sub>2</sub>) seepage, incorporating the LN<sub>2</sub> vaporization process. The model analyzes the impacts of LN<sub>2</sub> injection pressure, initial reservoir temperature, and natural fractures on temperature distribution, permeability changes, and damage mechanisms in heterogeneous coal. Results show that higher LN<sub>2</sub> injection pressure accelerates temperature decline, expands the thermal influence zone, intensifies damage, and enhances permeability. Higher initial reservoir temperature increases heat transfer rates, shifting damage evolution from gradual accumulation to rapid leaps. LN<sub>2</sub> seepage into fracture networks induces spatially anisotropic temperature and thermal stress distributions, driving non-uniform damage evolution. Weak bonds between coal matrix mineral particles are prone to tensile or shear fractures under combined thermal stress and pore pressure. Natural fractures guide LN<sub>2</sub> seepage, with increased fracture density promoting interconnected damage pathways, facilitating efficient LN<sub>2</sub> seepage into the reservoir.</p>

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Study on a Thermo-Hydro-Mechanical-Damage Coupling Model and Numerical Simulation of Coal Body Considering Liquid Nitrogen Seepage

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Changbao Jiang,
  • Hao Li,
  • Chonghong Zhao,
  • Yunbo Li,
  • Jian Hou,
  • Yi Li,
  • Qiang Li,
  • Wei Li

摘要

This study develops a coupling model to investigate the multi-mode coupled heat transfer and damage evolution in coal reservoir during liquid nitrogen (LN2) seepage, incorporating the LN2 vaporization process. The model analyzes the impacts of LN2 injection pressure, initial reservoir temperature, and natural fractures on temperature distribution, permeability changes, and damage mechanisms in heterogeneous coal. Results show that higher LN2 injection pressure accelerates temperature decline, expands the thermal influence zone, intensifies damage, and enhances permeability. Higher initial reservoir temperature increases heat transfer rates, shifting damage evolution from gradual accumulation to rapid leaps. LN2 seepage into fracture networks induces spatially anisotropic temperature and thermal stress distributions, driving non-uniform damage evolution. Weak bonds between coal matrix mineral particles are prone to tensile or shear fractures under combined thermal stress and pore pressure. Natural fractures guide LN2 seepage, with increased fracture density promoting interconnected damage pathways, facilitating efficient LN2 seepage into the reservoir.