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<p>Utilizing the thermal and chemical permeability enhancement effects of hot flue gas can effectively improve the gas permeability of deep coal seams. However, the competitive permeability enhancement mechanism between thermal and chemical effects caused by temperature changes in the CO<sub>2</sub>-H<sub>2</sub>O-coal interaction remains unclear, and the theoretical model that can capture the permeability changes induced by the coupled thermal and chemical effects has rarely been mentioned. Therefore, it is of great significance to explore the influence of the coupled thermal and chemical effects on coal permeability and further establish an appropriate permeability model for gas production capacity forecast. In this paper, the reaction solution pH, soluble mineral content, and coal permeability under different treating temperatures were first tested and analyzed based on a self-built CO<sub>2</sub>-H<sub>2</sub>O-coal interaction platform. Subsequently, a permeability model considering the coupling of thermal effects (thermal damage, thermal expansion, and dissolution weakening) and chemical effects (mineral dissolution, inward expansion of matrix strengthening, and fracture modulus degradation) was established and matched with experimental data. Finally, the magnitude of permeability enhancement resulting from thermal and chemical effects was quantitatively analyzed based on the verified permeability model. The research can provide theoretical guidance for the application of hot flue gas to enhance permeability in deep coal seams.</p>

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Competitive mechanisms of thermal and chemical permeability enhancement effects under the influence of CO2-H2O-coal interaction temperature

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Yu Shi,
  • Baiquan Lin,
  • Ting Liu,
  • Tao Huang

摘要

Utilizing the thermal and chemical permeability enhancement effects of hot flue gas can effectively improve the gas permeability of deep coal seams. However, the competitive permeability enhancement mechanism between thermal and chemical effects caused by temperature changes in the CO2-H2O-coal interaction remains unclear, and the theoretical model that can capture the permeability changes induced by the coupled thermal and chemical effects has rarely been mentioned. Therefore, it is of great significance to explore the influence of the coupled thermal and chemical effects on coal permeability and further establish an appropriate permeability model for gas production capacity forecast. In this paper, the reaction solution pH, soluble mineral content, and coal permeability under different treating temperatures were first tested and analyzed based on a self-built CO2-H2O-coal interaction platform. Subsequently, a permeability model considering the coupling of thermal effects (thermal damage, thermal expansion, and dissolution weakening) and chemical effects (mineral dissolution, inward expansion of matrix strengthening, and fracture modulus degradation) was established and matched with experimental data. Finally, the magnitude of permeability enhancement resulting from thermal and chemical effects was quantitatively analyzed based on the verified permeability model. The research can provide theoretical guidance for the application of hot flue gas to enhance permeability in deep coal seams.