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Study on the Evolution Law of Wellbore Stability Interface during Drilling of Offshore Gas Hydrate Reservoirs

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  • Xuefeng Li

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Baojiang Sun

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Baojin Ma

    (CNPC Offshore Engineering Company Limited, Beijing 100028, China)

  • Hao Li

    (School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China)

  • Huaqing Liu

    (CNPC Offshore Engineering Company Limited, Beijing 100028, China)

  • Dejun Cai

    (CNPC Offshore Engineering Company Limited, Beijing 100028, China)

  • Xiansi Wang

    (CNPC Offshore Engineering Company Limited, Beijing 100028, China)

  • Xiangpeng Li

    (CNPC Offshore Engineering Company Limited, Beijing 100028, China)

Abstract

The study of wellbore stability in offshore gas hydrate reservoirs is an important basis for the large-scale exploitation of natural gas hydrate resources. The wellbore stability analysis model in this study considers the evolution of the reservoir mechanical strength, wellbore temperature, and pressure parameters along the depth and uses plastic strain as a new criterion for wellbore instability. The wellbore stability model couples the hydrate phase transition near the wellbore area under the effect of the wellbore temperature and pressure field and the ‘heat–fluid–solid’ multifield evolution characteristics, and then simulates the stability evolution law of the wellbore area during the drilling process in the shallow seabed. The research results show that, owing to the low temperature of the seawater section and shallow formation, the temperature of the drilling fluid in the shallow layer of the wellbore can be maintained below the formation temperature, which effectively inhibits the decomposition of hydrates in the wellbore area. When the wellbore temperature increases or pressure decreases, the hydrate decomposition rate near the wellbore accelerates, and the unstable area of the wellbore will further expand. The research results can provide a reference for the design of drilling parameters for hydrate reservoirs.

Suggested Citation

  • Xuefeng Li & Baojiang Sun & Baojin Ma & Hao Li & Huaqing Liu & Dejun Cai & Xiansi Wang & Xiangpeng Li, 2023. "Study on the Evolution Law of Wellbore Stability Interface during Drilling of Offshore Gas Hydrate Reservoirs," Energies, MDPI, vol. 16(22), pages 1-17, November.
  • Handle: RePEc:gam:jeners:v:16:y:2023:i:22:p:7585-:d:1280623
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    References listed on IDEAS

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    1. Oleg Bazaluk & Kateryna Sai & Vasyl Lozynskyi & Mykhailo Petlovanyi & Pavlo Saik, 2021. "Research into Dissociation Zones of Gas Hydrate Deposits with a Heterogeneous Structure in the Black Sea," Energies, MDPI, vol. 14(5), pages 1-24, March.
    2. Li, Xiao-Sen & Xu, Chun-Gang & Zhang, Yu & Ruan, Xu-Ke & Li, Gang & Wang, Yi, 2016. "Investigation into gas production from natural gas hydrate: A review," Applied Energy, Elsevier, vol. 172(C), pages 286-322.
    3. Chong, Zheng Rong & Yang, She Hern Bryan & Babu, Ponnivalavan & Linga, Praveen & Li, Xiao-Sen, 2016. "Review of natural gas hydrates as an energy resource: Prospects and challenges," Applied Energy, Elsevier, vol. 162(C), pages 1633-1652.
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