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Deformation characteristics of methane hydrate-bearing clayey and sandy sediments during depressurization dissociation

Author

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  • Li, Yanghui
  • Wang, Le
  • Xie, Yao
  • Wu, Peng
  • Liu, Tao
  • Huang, Lei
  • Zhang, Shuheng
  • Song, Yongchen

Abstract

Natural gas hydrate, a promising new energy, has been widely concerned from the past decades. Significant experimental efforts have been made to explore the mechanical characteristics of hydrate-bearing clayey sediment under stable conditions, however, few studies focus on the creep characteristics of it during the dissociation process, which is closer to the actual condition of the reservoir. This study shows the triaxial creep test results of methane hydrate-bearing clayey sediment with the depressurization dissociation method, and the methane hydrate-bearing sandy sediments are added for comparison. The results show that in the creep process: (1) the depressurization has little effect on axial strain but causes the increase of the volumetric strain and the reduction of equivalent Poisson's ratio; (2) the number of depressurization times has no obvious effect on the total settlement and gas production rate during the depressurization process, the gas production rate is mainly determined by the pore pressure; (3) the gas production rate of hydrate-bearing clayey sediments decreases during the depressurization process, while the hydrate-bearing sandy sediments show an opposite trend; (4) higher stress level causes a great increase of the axial strain, volumetric strain and equivalent Poisson's ratio, while it causes a slight increase of the gas production rate.

Suggested Citation

  • Li, Yanghui & Wang, Le & Xie, Yao & Wu, Peng & Liu, Tao & Huang, Lei & Zhang, Shuheng & Song, Yongchen, 2023. "Deformation characteristics of methane hydrate-bearing clayey and sandy sediments during depressurization dissociation," Energy, Elsevier, vol. 275(C).
    • Handle: RePEc:eee:energy:v:275:y:2023:i:c:s0360544223009210
    DOI: 10.1016/j.energy.2023.127527
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    References listed on IDEAS

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    1. Liu, Weiguo & Song, Qi & Wu, Peng & Liu, Tao & Huang, Lei & Zhang, Shuheng & Li, Yanghui, 2023. "Triaxial tests on anisotropic consolidated methane hydrate-bearing clayey-silty sediments of the South China Sea," Energy, Elsevier, vol. 284(C).
    2. You, Zeshao & Li, Yanghui & Liu, Tao & Qu, Yong & Hu, Wenkang & Song, Yongchen, 2024. "Stress-strain response and deformation behavior of hydrate-bearing sands under different grain sizes: A particle-scale study using DEM," Energy, Elsevier, vol. 290(C).
    3. Liu, Tao & Wu, Peng & You, Zeshao & Yu, Tao & Song, Qi & Song, Yuanxin & Li, Yanghui, 2023. "Deformation characteristics on anisotropic consolidated methane hydrate clayey-silty sediments of the South China Sea under heat injection," Energy, Elsevier, vol. 280(C).
    4. You, Zeshao & Li, Yanghui & Yang, Meixiao & Wu, Peng & Liu, Tao & Li, Jiayu & Hu, Wenkang & Song, Yongchen, 2024. "Investigation of particle-scale mechanical behavior of hydrate-bearing sands using DEM: Focus on hydrate habits," Energy, Elsevier, vol. 289(C).
    5. Li, Yanghui & Hu, Wenkang & Tang, Haoran & Wu, Peng & Liu, Tao & You, Zeshao & Yu, Tao & Song, Yongchen, 2023. "Mechanical properties of the interstratified hydrate-bearing sediment in permafrost zones," Energy, Elsevier, vol. 282(C).

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