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

Juan Jin, Jiandong Liu (), Weidong Jiang, Wei Cheng and Xiaowen Zhang
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Juan Jin: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Jiandong Liu: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Weidong Jiang: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Wei Cheng: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China
Xiaowen Zhang: Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China

Energies, 2022, vol. 15, issue 21, 1-16

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.

Keywords: high temperature; thermal conductivity; pore and fracture; anisotropy; oil shale (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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