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Numerical Investigation on Shape Optimization of Small-Spacing Twin-Well for Salt Cavern Gas Storage in Ultra-Deep Formation

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Listed:
  • Haitao Li

    (College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
    State Key Laboratory of Petroleum Resources & Engineering, China University of Petroleum, Beijing 102249, China)

  • Jingen Deng

    (College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
    State Key Laboratory of Petroleum Resources & Engineering, China University of Petroleum, Beijing 102249, China)

  • Qiqi Wanyan

    (PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China)

  • Yongcun Feng

    (College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
    State Key Laboratory of Petroleum Resources & Engineering, China University of Petroleum, Beijing 102249, China)

  • Arnaud Regis Kamgue Lenwoue

    (College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
    State Key Laboratory of Petroleum Resources & Engineering, China University of Petroleum, Beijing 102249, China)

  • Chao Luo

    (College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
    State Key Laboratory of Petroleum Resources & Engineering, China University of Petroleum, Beijing 102249, China)

  • Cheng Hui

    (College of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
    State Key Laboratory of Petroleum Resources & Engineering, China University of Petroleum, Beijing 102249, China)

Abstract

Small-spacing twin-well (SSTW) salt caverns have an extensive application prospect in thin or bedded rock salt formations due to their good performance, while they are rarely used in ultra-deep formations. The target strata depth of Pingdingshan salt mine is over 1700 m, and it is planned to apply an SSTW cavern to construct the underground gas storage (UGS). A 3D geomechanical model considering the viscoelastic plasticity of the rock mass is introduced into Flac 3D to numerically study the influence of internal gas pressure, cavern upper shape and well spacing on the stability of an SSTW salt cavern for Pingdingshan UGS. A set of assessment indices is summarized for the stability of gas storage. The results show that the minimum internal gas pressure is no less than 14 MPa, and the cavern should not be operated under constant low gas pressure for a long time. The cavern with an upper height of 70 m is recommended for Pingdingshan gas storage based on the safety evaluation and maximum volume. The well spacing has a limited influence on the stability of the salt cavern in view of the volume shrinkage and safety factor. Among the values of 10 m, 20 m and 30 m, the well spacing of 20 m is recommended for Pingdingshan gas storage. In addition, when the cavern groups are constructed, the pillar width on the short axis should be larger than that on the long axis due to its greater deformation in this direction. This study provides a design reference for the construction of salt cavern gas storage in ultra-deep formations with the technology of SSTW.

Suggested Citation

  • Haitao Li & Jingen Deng & Qiqi Wanyan & Yongcun Feng & Arnaud Regis Kamgue Lenwoue & Chao Luo & Cheng Hui, 2021. "Numerical Investigation on Shape Optimization of Small-Spacing Twin-Well for Salt Cavern Gas Storage in Ultra-Deep Formation," Energies, MDPI, vol. 14(10), pages 1-22, May.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:10:p:2859-:d:555447
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    References listed on IDEAS

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    1. Wang, Tongtao & Yan, Xiangzhen & Yang, Henglin & Yang, Xiujuan & Jiang, Tingting & Zhao, Shuai, 2013. "A new shape design method of salt cavern used as underground gas storage," Applied Energy, Elsevier, vol. 104(C), pages 50-61.
    2. Yang, Chunhe & Wang, Tongtao & Li, Yinping & Yang, Haijun & Li, Jianjun & Qu, Dan’an & Xu, Baocai & Yang, Yun & Daemen, J.J.K., 2015. "Feasibility analysis of using abandoned salt caverns for large-scale underground energy storage in China," Applied Energy, Elsevier, vol. 137(C), pages 467-481.
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    Cited by:

    1. Reza Rezaee, 2022. "Editorial on Special Issues of Development of Unconventional Reservoirs," Energies, MDPI, vol. 15(7), pages 1-9, April.

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