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Evolution of the Anisotropic Thermal Conductivity of Oil Shale with Temperature and Its Relationship with Anisotropic Pore Structure Evolution

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  • Juan Jin

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
    Key Laboratory of Oil & Gas Production, CNPC, Beijing 100083, China)

  • Jiandong Liu

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
    Key Laboratory of Oil & Gas Production, CNPC, Beijing 100083, China)

  • Weidong Jiang

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
    Key Laboratory of Oil & Gas Production, CNPC, Beijing 100083, China)

  • Wei Cheng

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
    Key Laboratory of Oil & Gas Production, CNPC, Beijing 100083, China)

  • Xiaowen Zhang

    (Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
    Key Laboratory of Oil & Gas Production, CNPC, Beijing 100083, China)

Abstract

Due to its sedimentary characteristics and natural fractures, oil shale shows anisotropy in heat transfer characteristics. Moreover, the anisotropic thermal conductivity will change with the temperature. This change in the anisotropic thermal conductivity coefficient affects the temperature field distribution and heating efficiency during the in situ electric heating pyrolysis of oil shale. Therefore, it is very important to study the evolution of the anisotropy thermal conductivity coefficient of oil shale with temperature. In this study, the variation of weight loss and the specific heat of an oil shale with temperature is investigated using a differential scanning calorimeter. The variation of the anisotropic pore and fracture structure of the oil shale with temperature is studied through CT scanning technology. The variation of the anisotropic thermal conductivity with temperature is studied through the hot disk method. Finally, the relationship between the change in the anisotropic heat conductivity of the oil shale and the evolution of the anisotropic pore and fracture structure is discussed. The results show that the mass loss of oil shale mainly occurs after 400 °C. The thermal conductivity of both perpendicular and parallel to bedding directions decreases linearly with the increase of temperature. The research results of this study can serve as an important reference in the study of the in situ pyrolysis of oil shale.

Suggested Citation

  • Juan Jin & Jiandong Liu & Weidong Jiang & Wei Cheng & Xiaowen Zhang, 2022. "Evolution of the Anisotropic Thermal Conductivity of Oil Shale with Temperature and Its Relationship with Anisotropic Pore Structure Evolution," Energies, MDPI, vol. 15(21), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:21:p:8021-:d:956262
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    References listed on IDEAS

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    Cited by:

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