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Characteristics of Elastoplastic Consolidation by Compaction and Its Effects on Coal Permeability

Author

Listed:
  • Zhenghuai Guo

    (Faculty of Oil and Gas Engineering/Energy Engineering, Changzhou University, Changzhou 213100, China)

  • Klaus Regenauer-Lieb

    (WA School of Mines: Minerals, Energy and Chemical Engineering, Curtin University, Perth, WA 6102, Australia
    School of Minerals and Energy Resources Engineering, UNSW, Sydney, NSW 2052, Australia)

  • Phung Nhu Hao Vu

    (School of Minerals and Energy Resources Engineering, UNSW, Sydney, NSW 2052, Australia)

  • Zhenliang Guan

    (Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China)

Abstract

This paper presents a combined experimental–analytical investigation of coal strain development under fluctuating applied hydrostatic stress. The laboratory setup mimics the isotropic volumetric compaction of coal under burial–uplift cycles in the absence of tectonic stress. Special emphasis is placed on the corresponding permeability evolution of the coal strata. Our results show that the stress–strain path is exponential, approaching a linear relation in the logarithmic stress–strain space with the monotonic increase in stress. A similar behavior is found for the strain–permeability path in the logarithmic strain–permeability space. The permeability recovery undergoes hysteresis with respect to the stress in a stress loading–unloading cycle, but the hysteresis is not manifest with respect to the strain. A theoretical geomechanical consolidation analysis was performed using an elastoplastic modelling framework. The analysis suggests that plastic strain is the cause of the hysteresis of the strain recovery in a stress loading–unloading cycle. The closed hysteresis loops manifested in stress loading–unloading–reloading cycles are promoted by the plastic strain during stress unloading and the difference in evolution rates of the elastic core between loading and unloading. The results of this study are helpful for understanding the mechanism of permeability evolution and optimizing water and coal seam gas production.

Suggested Citation

  • Zhenghuai Guo & Klaus Regenauer-Lieb & Phung Nhu Hao Vu & Zhenliang Guan, 2022. "Characteristics of Elastoplastic Consolidation by Compaction and Its Effects on Coal Permeability," Energies, MDPI, vol. 15(20), pages 1-35, October.
  • Handle: RePEc:gam:jeners:v:15:y:2022:i:20:p:7647-:d:944253
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    References listed on IDEAS

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    1. Congcong Li & Shuoliang Wang & Qing You & Chunlei Yu, 2021. "A New Measurement of Anisotropic Relative Permeability and Its Application in Numerical Simulation," Energies, MDPI, vol. 14(16), pages 1-18, August.
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