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Mechanical properties and strength criterion of clayey sand reservoirs during natural gas hydrate extraction

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  • Chen, Huie
  • Du, Hua
  • Shi, Bin
  • Shan, Wenchong
  • Hou, Jiaqi

Abstract

To study the changes in mechanical properties of hydrate bearing clayey sand reservoirs during the mining process and explain the mechanism from a microscopic perspective, soil samples were artificially configured based on the parameters of SH7B drilling cores in Shenhu area of South China Sea. Natural gas hydrate was formed in the samples, and the mining process was simulated by hydrate decomposition under depressurization. Multistage triaxial tests were carried out, and scanning electron microscopy was conducted on samples after triaxial experiment. The results showed that the shear strengths of samples decreased with the decomposition of hydrate, and the effective cohesion was positively correlated with hydrate saturation degree. An expression for the linear growth of shear strength with effective confining pressure and hydrate saturation degree was established. In addition, hydrate saturation degree was introduced as a parameter into the Mohr-Coulomb criterion to establish a strength criterion applicable to clayey sand reservoirs in the mining process. With the decrease of hydrate saturation degree, the microstructures of samples after shearing were gradually compacted, indicating that the hydrate and soil particles bore the external load together during shear test, which maintained the morphology of pores and improved the shear strength of samples.

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  • Chen, Huie & Du, Hua & Shi, Bin & Shan, Wenchong & Hou, Jiaqi, 2022. "Mechanical properties and strength criterion of clayey sand reservoirs during natural gas hydrate extraction," Energy, Elsevier, vol. 242(C).
    • Handle: RePEc:eee:energy:v:242:y:2022:i:c:s0360544221027754
    DOI: 10.1016/j.energy.2021.122526
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    References listed on IDEAS

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    1. Li, Xiao-Sen & Yang, Bo & Zhang, Yu & Li, Gang & Duan, Li-Ping & Wang, Yi & Chen, Zhao-Yang & Huang, Ning-Sheng & Wu, Hui-Jie, 2012. "Experimental investigation into gas production from methane hydrate in sediment by depressurization in a novel pilot-scale hydrate simulator," Applied Energy, Elsevier, vol. 93(C), pages 722-732.
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    3. Sun, Xiang & Li, Yanghui & Liu, Yu & Song, Yongchen, 2019. "The effects of compressibility of natural gas hydrate-bearing sediments on gas production using depressurization," Energy, Elsevier, vol. 185(C), pages 837-846.
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    Cited by:

    1. Wang, Chongyang & Zhang, Dongming & Liu, Chenxi & Pan, Yisha & Jiang, Zhigang & Yu, Beichen & Lin, Yun, 2023. "Deformation and seepage characteristics of water-saturated shale under true triaxial stress," Energy, Elsevier, vol. 284(C).
    2. Guo, Wei & Li, Yiming & Jia, Rui & Wang, Yuan & Tang, Gege & Li, Xiaolin, 2023. "Experimental study on mechanical properties of pore-filling and fracture-filling clayey silt hydrate-bearing sediments," Energy, Elsevier, vol. 284(C).
    3. Du, Hua & Chen, Huie & Kong, Fansheng & Luo, Yonggui, 2023. "Failure mode and the mechanism of methane hydrate-bearing clayey sand sediments under depressurization," Energy, Elsevier, vol. 279(C).
    4. Zhao, Xin & Geng, Qi & Zhang, Zhen & Qiu, Zhengsong & Fang, Qingchao & Wang, Zhiyuan & Yan, Chuanliang & Ma, Yongle & Li, Yang, 2023. "Phase change material microcapsules for smart temperature regulation of drilling fluids for gas hydrate reservoirs," Energy, Elsevier, vol. 263(PB).

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