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Macro and Meso Characteristics of In-Situ Oil Shale Pyrolysis Using Superheated Steam

Author

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  • Lei Wang

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Key Laboratory of In-situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Dong Yang

    (Key Laboratory of In-situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Xiang Li

    (Key Laboratory of In-situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Jing Zhao

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Key Laboratory of In-situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Guoying Wang

    (Key Laboratory of In-situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

  • Yangsheng Zhao

    (College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, China
    Key Laboratory of In-situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China)

Abstract

The efficiency of oil shale pyrolysis is directly related to the feasibility of in-situ mining technology. Taiyuan University of Technology (China) proposed the technology of in-situ convective heating of oil shale, which uses superheated steam as the heat carrier to heat the oil shale’s ore-body and transport the pyrolysis products. Based on the simulated experiments of in-situ oil shale pyrolysis using superheated steam, the changes in fracture characteristics, pyrolysis characteristics and mesoscopic characteristics of the oil shale during the pyrolysis have been systematically studied in this work. The Xinjiang oil shale’s pyrolysis temperature ranged within 400–510 °C. When the temperature is 447 °C, the rate of pyrolysis of kerogen is the fastest. During the pyrolysis process, the pressure of superheated steam changes within the range of 0.1–11.1 MPa. With the continuous thermal decomposition, the horizontal stress difference shows a tendency to first increase and then, decrease. The rate of weight loss of oil shale residue at various locations after the pyrolysis is found to be within the range of 0.17–2.31%, which is much lower than the original value of 10.8%, indicating that the pyrolysis is more adequate. Finally, the number of microcracks (<50 µm) in the oil shale after pyrolysis is found to be lie within the range of 25–56 and the average length lies within the range of 53.9636–62.3816 µm. The connectivity of the internal pore groups is satisfactory, while the seepage channel is found to be smooth. These results fully reflect the high efficiency and feasibility of in-situ oil shale pyrolysis using superheated steam.

Suggested Citation

  • Lei Wang & Dong Yang & Xiang Li & Jing Zhao & Guoying Wang & Yangsheng Zhao, 2018. "Macro and Meso Characteristics of In-Situ Oil Shale Pyrolysis Using Superheated Steam," Energies, MDPI, vol. 11(9), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2297-:d:166858
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    References listed on IDEAS

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    1. Youhong Sun & Li He & Shijie Kang & Wei Guo & Qiang Li & Sunhua Deng, 2018. "Pore Evolution of Oil Shale during Sub-Critical Water Extraction," Energies, MDPI, vol. 11(4), pages 1-15, April.
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    Cited by:

    1. Wei Guo & Zhendong Wang & Youhong Sun & Xiaoshu Lü & Yuan Wang & Sunhua Deng & Qiang Li, 2020. "Effects of Packer Locations on Downhole Electric Heater Performance: Experimental Test and Economic Analysis," Energies, MDPI, vol. 13(2), pages 1-17, January.
    2. Xudong Huang & Dong Yang & Zhiqin Kang, 2020. "Study on the Pore and Fracture Connectivity Characteristics of Oil Shale Pyrolyzed by Superheated Steam," Energies, MDPI, vol. 13(21), pages 1-14, November.
    3. Artur J. Jaworski, 2019. "Special Issue “Fluid Flow and Heat Transfer”," Energies, MDPI, vol. 12(16), pages 1-4, August.
    4. Haibo Tang & Yangsheng Zhao & Zhiqin Kang & Zhaoxing Lv & Dong Yang & Kun Wang, 2022. "Investigation on the Fracture-Pore Evolution and Percolation Characteristics of Oil Shale under Different Temperatures," Energies, MDPI, vol. 15(10), pages 1-14, May.
    5. Kang, Zhiqin & Zhao, Yangsheng & Yang, Dong, 2020. "Review of oil shale in-situ conversion technology," Applied Energy, Elsevier, vol. 269(C).

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