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Experimental study on water saturation effect on coal sample permeability under different effective stresses

Author

Listed:
  • Junhuan Lei

    (China University of Mining and Technology (Beijing))

  • Zhaoping Meng

    (China University of Mining and Technology (Beijing)
    State Key Laboratory of Coal and CBM Co-Mining)

  • Zhen Shen

    (China University of Mining and Technology (Beijing))

  • Haoyue Chen

    (China University of Mining and Technology (Beijing))

Abstract

During the drainage and production of coalbed methane (CBM) wells, the constant changes in stress and water saturation of reservoir restrict the dynamic change of the reservoir permeability. By carrying out stress sensitivity experiments with different water saturations in coal, the correlation between permeability and the coupling of effective stress and water saturation was analyzed. The water saturation sensitivity and stress sensitivity of reservoir were evaluated by the stress sensitivity index (S), permeability damage rate (PDR), and stress sensitivity coefficient (αk), and the change law of coal permeability under different stresses with different water saturations was revealed. The results showed that the coal reservoir permeability decreased with increasing stress following a negative exponential function and decreased nearly linearly with increasing water saturation. In addition, the coal water saturation sensitivity was positively correlated with effective stress, and the coal stress sensitivity was positively correlated with water saturation. Finally, a mathematical model for predicting coal permeability that considered the impacts of water saturation and effective stress was established, revealing the controlled mechanism affecting the permeability change.

Suggested Citation

  • Junhuan Lei & Zhaoping Meng & Zhen Shen & Haoyue Chen, 2023. "Experimental study on water saturation effect on coal sample permeability under different effective stresses," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 116(3), pages 3139-3163, April.
    • Handle: RePEc:spr:nathaz:v:116:y:2023:i:3:d:10.1007_s11069-022-05801-1
    DOI: 10.1007/s11069-022-05801-1
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    References listed on IDEAS

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    1. Yuan Zhao & Shugang Cao & Yong Li & Hongyun Yang & Ping Guo & Guojun Liu & Ruikai Pan, 2018. "Experimental and numerical investigation on the effect of moisture on coal permeability," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 90(3), pages 1201-1221, February.
    2. Mateusz Kudasik, 2019. "Investigating Permeability of Coal Samples of Various Porosities under Stress Conditions," Energies, MDPI, vol. 12(4), pages 1-16, February.
    3. Yang Liu & Tong Zhang & Yankun Ma & Shuaibing Song & Ming Tang & Yanfang Li, 2022. "Deformation behavior and damage-induced permeability evolution of sandy mudstone under triaxial stress," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 113(3), pages 1729-1749, September.
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