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Numerical study on the in-situ pyrolysis process of steeply dipping oil shale deposits by injecting superheated water steam: A case study on Jimsar oil shale in Xinjiang, China

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  • Wang, Guoying
  • Liu, Shaowei
  • Yang, Dong
  • Fu, Mengxiong

Abstract

Taking the oil shale deposits in the Jimsar area of Xinjiang, China as an example, this paper proposes an in-situ pyrolysis method using superheated steam suitable for steeply dipping oil shale. This method involves drilling parallel to the bedding and fracturing fractures perpendicular to bedding direction. High-temperature fluid is injected from the injection well to develop a larger heat exchange area through fracturing fractures and oil shale deposits. In this study, a thermal-hydraulic-mechanical coupling mathematical model considering oil shale anisotropy was established to study the in-situ conversion process. The results show that the new proposed method (hydraulic fracture number = 3) has the same heating efficiency as the traditional well layout method (drilling well perpendicular to beddings, fracture number = 3), but has the advantage of preventing shear damage to the wellbore and reducing the drilling cost; For the optimization of hydraulic fracture number and length, when the hydraulic fracture number is increased to 4 (fracture spacing = 20 m), the heating efficiency no longer significantly increases. When the fracture length increased, the heating efficiency does not significantly change. The results of this paper can serve as a reference for the study of in-situ pyrolysis of steeply dipping oil shale deposits.

Suggested Citation

  • Wang, Guoying & Liu, Shaowei & Yang, Dong & Fu, Mengxiong, 2022. "Numerical study on the in-situ pyrolysis process of steeply dipping oil shale deposits by injecting superheated water steam: A case study on Jimsar oil shale in Xinjiang, China," Energy, Elsevier, vol. 239(PC).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pc:s0360544221024300
    DOI: 10.1016/j.energy.2021.122182
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    References listed on IDEAS

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    Cited by:

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    3. Zhan, Honglei & Yang, Qi & Qin, Fankai & Meng, Zhaohui & Chen, Ru & Miao, Xinyang & Zhao, Kun & Yue, Wenzheng, 2022. "Comprehensive preparation and multiscale characterization of kerogen in oil shale," Energy, Elsevier, vol. 252(C).
    4. Xu, WenLong & Yu, Hao & Micheal, Marembo & Huang, HanWei & Liu, He & Wu, HengAn, 2023. "An integrated model for fracture propagation and production performance of thermal enhanced shale gas recovery," Energy, Elsevier, vol. 263(PA).
    5. Wang, Lei & Yang, Dong & Zhang, Yuxing & Li, Wenqing & Kang, Zhiqin & Zhao, Yangsheng, 2022. "Research on the reaction mechanism and modification distance of oil shale during high-temperature water vapor pyrolysis," Energy, Elsevier, vol. 261(PB).
    6. Shi, Yu & Zhang, Yulong & Song, Xianzhi & Cui, Qiliang & Lei, Zhihong & Song, Guofeng, 2023. "Injection energy utilization efficiency and production performance of oil shale in-situ exploitation," Energy, Elsevier, vol. 263(PB).
    7. Hao Wang & Xiaogang Li & Jingyi Zhu & Zhaozhong Yang & Jie Zhou & Liangping Yi, 2022. "Numerical Simulation of Oil Shale Pyrolysis under Microwave Irradiation Based on a Three-Dimensional Porous Medium Multiphysics Field Model," Energies, MDPI, vol. 15(9), pages 1-20, April.
    8. Huang, HanWei & Yu, Hao & Xu, WenLong & Lyu, ChengSi & Micheal, Marembo & Xu, HengYu & Liu, He & Wu, HengAn, 2023. "A coupled thermo-hydro-mechanical-chemical model for production performance of oil shale reservoirs during in-situ conversion process," Energy, Elsevier, vol. 268(C).
    9. Juan Jin & Weidong Jiang & Jiandong Liu & Junfeng Shi & Xiaowen Zhang & Wei Cheng & Ziniu Yu & Weixi Chen & Tingfu Ye, 2023. "Numerical Analysis of In Situ Conversion Process of Oil Shale Formation Based on Thermo-Hydro-Chemical Coupled Modelling," Energies, MDPI, vol. 16(5), pages 1-17, February.
    10. 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.
    11. Guo, Wei & Zhang, Xu & Sun, Youhong & Li, Qiang & Liu, Zhao, 2023. "Migration mechanism of pyrolysis oil during oil shale in situ pyrolysis exploitation," Energy, Elsevier, vol. 285(C).

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