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Mechanism of Structural Damage in Low Permeability Coal Material of Coalbed Methane Reservoir under Cyclic Cold Loading

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  • Hewan Li

    (School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
    School of Mechanics & Engineering, Liaoning Technical University, Fuxin 123000, China)

  • Jianping Zuo

    (School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China)

  • Laigui Wang

    (School of Mechanics & Engineering, Liaoning Technical University, Fuxin 123000, China)

  • Pengfei Li

    (School of Mechanical Engineering, Liaoning Technical University, Fuxin 123000, China)

  • Xiaowei Xu

    (School of Mechanics & Engineering, Liaoning Technical University, Fuxin 123000, China)

Abstract

The pore and fracture structure of coal is the main factor that affects the storage and seepage capacity of coalbed methane. The damage of coal structure can improve the gas permeability of coalbed methane. A coal sample with a drilled hole was kept inside of a custom-designed device to supply confining pressure to the coal sample. Liquid nitrogen was injected into the drilled hole of the coal sample to apply cyclic cold loading. Confining pressures varying from 0~7 MPa to the coal sample were applied to explore the relationship between the structural damage and confining pressure. The structural damage rules of coal samples under different confining pressure were revealed. The results showed that: (1) The structural damage degree of the coal sample increases with the increase of confining pressure; (2) The coal sample was broken after three cycles of cold loading under 7 MPa confining pressure; (3) Without confining pressure, the coal sample is more likely to be damaged or even destroyed by cold liquid nitrogen. (4) The fracture extends along the stratification direction of coal samples, which is significant for coal samples with original fractures, but not obvious for the coal sample without fracture. The research results provide a new method and theoretical basis for permeability improvement of the coal seam.

Suggested Citation

  • Hewan Li & Jianping Zuo & Laigui Wang & Pengfei Li & Xiaowei Xu, 2020. "Mechanism of Structural Damage in Low Permeability Coal Material of Coalbed Methane Reservoir under Cyclic Cold Loading," Energies, MDPI, vol. 13(3), pages 1-15, January.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:3:p:519-:d:311340
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    References listed on IDEAS

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    2. Magdalena Tutak & Jarosław Brodny, 2019. "Forecasting Methane Emissions from Hard Coal Mines Including the Methane Drainage Process," Energies, MDPI, vol. 12(20), pages 1-28, October.
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