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Dynamic evolution of shale permeability under coupled temperature and effective stress conditions

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  • Li, Guoliang
  • Li, Guanfang
  • Luo, Chao
  • Zhou, Runqing
  • Zhou, Jian
  • Yang, Jijin

Abstract

The permeability of shale in unconventional subsurface reservoirs under high-temperature and high effective stress conditions is of great significance for evaluating the extraction efficiency of shale gas and determining reservoir development programs. In this study, a series of permeability experiments using nitrogen gas were conducted on a sample from the lower Longmaxi Formation over a range of temperature (25–100 °C), effective stress (22.5–52.5 MPa), and pore pressure (0.5–8 MPa) conditions. The dynamic relationships between permeability and temperature, effective stress, and pore pressure are analyzed in detail. The results show that the apparent permeability decreases approximately linearly with increasing pore pressure, temperature, and effective stress. The absolute permeability also decreases with increasing temperature or effective stress. Upon increasing the reservoir depth by 1000 m, the permeability decreases by an average of approximately 25%. Approximately two-thirds of this decline is caused by changes in the effective stress and approximately one-third by changes in temperature. The Klinkenberg parameter is also found to be positively correlated with temperature and effective stress. The results herein provide important guidance for evaluating permeability changes and the extraction efficiency for deep shale gas development.

Suggested Citation

  • Li, Guoliang & Li, Guanfang & Luo, Chao & Zhou, Runqing & Zhou, Jian & Yang, Jijin, 2023. "Dynamic evolution of shale permeability under coupled temperature and effective stress conditions," Energy, Elsevier, vol. 266(C).
    • Handle: RePEc:eee:energy:v:266:y:2023:i:c:s0360544222032066
    DOI: 10.1016/j.energy.2022.126320
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    References listed on IDEAS

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    1. Shi, Rui & Liu, Jishan & Wang, Xiaoming & Wei, Mingyao & Elsworth, Derek, 2021. "A critical analysis of shale laboratory permeability evolution data," Energy, Elsevier, vol. 236(C).
    2. Yang, Kang & Zhou, Junping & Xian, Xuefu & Zhou, Lei & Zhang, Chengpeng & Tian, Shifeng & Lu, Zhaohui & Zhang, Fengshou, 2022. "Chemical-mechanical coupling effects on the permeability of shale subjected to supercritical CO2-water exposure," Energy, Elsevier, vol. 248(C).
    3. Tian, Zhenhua & Wei, Wei & Zhou, Shangwen & Sun, Chenhao & Rezaee, Reza & Cai, Jianchao, 2022. "Impacts of gas properties and transport mechanisms on the permeability of shale at pore and core scale," Energy, Elsevier, vol. 244(PA).
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