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Study on hydro-mechanical-damage coupling seepage in digital shale cores: A case study of shale in Bohai Bay Basin

Author

Listed:
  • Xie, Yetong
  • Li, Jing
  • Liu, Huimin
  • Zhang, Kuihua
  • Li, Junliang
  • Li, Chuanhua
  • Zhu, Rui

Abstract

The 3D digital core was reconstructed based on a CT scanning test, and the digital cores seepage simulation was investigated to study the shale's microscopic seepage characteristics. In detail, we discussed the effects of confining pressure, fluid pressure, and pore structure on the micro seepage of shale. The results showed that: (1) The confining pressure negatively affected the average velocity of the fluid, whether in pores, matrix, or the entire digital core. Due to the effect of confining pressure on fluid velocity, there was a significant negative exponential relation between permeability and confining pressure, with the confining pressure increasing from 5 MPa to 70 MPa (2) The fluid pressure positively affected the fluid velocity. Because of the effect of fluid pressure on fluid velocity, the permeability and the fluid pressure in simulation showed a significant positive exponential function relation, with the fluid pressure increasing from 1 MPa to 20 MPa (3) The fluid seepage was intensified when the flaky connected fracture was parallel to the fluid pressure direction. However, when the flaky connected fracture was perpendicular to the fluid pressure direction, it would hinder fluid seepage. (4) Permeability was positively correlated with porosity and fractal dimension but negatively correlated with tortuosity.

Suggested Citation

  • Xie, Yetong & Li, Jing & Liu, Huimin & Zhang, Kuihua & Li, Junliang & Li, Chuanhua & Zhu, Rui, 2023. "Study on hydro-mechanical-damage coupling seepage in digital shale cores: A case study of shale in Bohai Bay Basin," Energy, Elsevier, vol. 268(C).
    • Handle: RePEc:eee:energy:v:268:y:2023:i:c:s0360544223001536
    DOI: 10.1016/j.energy.2023.126759
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    References listed on IDEAS

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    1. Silin, Dmitriy & Patzek, Tad, 2006. "Pore space morphology analysis using maximal inscribed spheres," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 371(2), pages 336-360.
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    3. Li, Jing & Xie, Yetong & Liu, Huimin & Zhang, Xuecai & Li, Chuanhua & Zhang, Lisong, 2023. "Combining macro and micro experiments to reveal the real-time evolution of permeability of shale," Energy, Elsevier, vol. 262(PB).
    4. Solarin, Sakiru Adebola & Gil-Alana, Luis A. & Lafuente, Carmen, 2020. "An investigation of long range reliance on shale oil and shale gas production in the U.S. market," Energy, Elsevier, vol. 195(C).
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    Cited by:

    1. Xing, Zhihao & Yao, Jun & Liu, Lei & Sun, Hai, 2024. "Efficiently reconstructing high-quality details of 3D digital rocks with super-resolution Transformer," Energy, Elsevier, vol. 300(C).
    2. Li, Jiangtao & Zhou, Xiaofeng & Gayubov, Abdumalik & Shamil, Sultanov, 2023. "Study on production performance characteristics of horizontal wells in low permeability and tight oil reservoirs," Energy, Elsevier, vol. 284(C).
    3. Xie, Yetong & Liu, Huimin & Zhang, Kuihua & Jia, Wenhua & Li, Jing & Meng, Xiaoyu, 2023. "Dynamic evaluation of microscopic damage and fluid flow behavior in reservoir shale under deviatoric stress," Energy, Elsevier, vol. 283(C).

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