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Methane hydrate decomposition and sediment deformation in unconfined sediment with different types of concentrated hydrate accumulations by innovative experimental system

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  • Wang, Yi
  • Feng, Jing-Chun
  • Li, Xiao-Sen
  • Zhang, Yu
  • Han, Han

Abstract

Methane hydrates are regarded as a potential source of energy supply. Geological features of different types of concentrated gas hydrate accumulations show great variations. In this study, methane hydrate decomposition in unconfined sediment with different types of concentrated hydrate accumulations are firstly investigated by experiments, and the influence of hydrate decomposition on sediment deformation is analyzed. Two types of concentrated hydrate accumulations are selected, which are grain-displacing hydrate (nodules) and pore-filling hydrate in sediment. An innovative high pressure set-up with a quick-opening top cover is applied to investigate hydrate decomposition under the geological conditions of the hydrate reservoir in the South China Sea. Experimental results indicate that the influence of hydrate morphology and hydrate distribution on gas production is not obviously. The average heat transfer rates during grain-displacing hydrate dissociation and pore-filling hydrate dissociation are also similar. However, the sediment deformation characteristics for different types of concentrated hydrate accumulations are totally different. Structure collapse of porous media is firstly observed in the experiments within the grain-displacing hydrate, which indicates that the sediment deformation cannot be ignored during the gas recovery from grain-displacing hydrate. Meanwhile, the radial shrinkage effect of sediment is found during pore-filling hydrate dissociation, due to the cementation effect of hydrate.

Suggested Citation

  • Wang, Yi & Feng, Jing-Chun & Li, Xiao-Sen & Zhang, Yu & Han, Han, 2018. "Methane hydrate decomposition and sediment deformation in unconfined sediment with different types of concentrated hydrate accumulations by innovative experimental system," Applied Energy, Elsevier, vol. 226(C), pages 916-923.
    • Handle: RePEc:eee:appene:v:226:y:2018:i:c:p:916-923
    DOI: 10.1016/j.apenergy.2018.06.062
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    Cited by:

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    3. Wang, Bin & Liu, Shuyang & Wang, Pengfei, 2022. "Microwave-assisted high-efficient gas production of depressurization-induced methane hydrate exploitation," Energy, Elsevier, vol. 247(C).
    4. Wang, Bin & Dong, Hongsheng & Fan, Zhen & Liu, Shuyang & Lv, Xin & Li, Qingping & Zhao, Jiafei, 2020. "Numerical analysis of microwave stimulation for enhancing energy recovery from depressurized methane hydrate sediments," Applied Energy, Elsevier, vol. 262(C).
    5. Wei, Rupeng & Xia, Yongqiang & Wang, Zifei & Li, Qingping & Lv, Xin & Leng, Shudong & Zhang, Lunxiang & Zhang, Yi & Xiao, Bo & Yang, Shengxiong & Yang, Lei & Zhao, Jiafei & Song, Yongchen, 2022. "Long-term numerical simulation of a joint production of gas hydrate and underlying shallow gas through dual horizontal wells in the South China Sea," Applied Energy, Elsevier, vol. 320(C).
    6. Lee, Yohan & Deusner, Christian & Kossel, Elke & Choi, Wonjung & Seo, Yongwon & Haeckel, Matthias, 2020. "Influence of CH4 hydrate exploitation using depressurization and replacement methods on mechanical strength of hydrate-bearing sediment," Applied Energy, Elsevier, vol. 277(C).
    7. Tzu-Keng Lin & Bieng-Zih Hsieh, 2020. "Prevention of Seabed Subsidence of Class-1 Gas Hydrate Deposits via CO 2 -EGR: A Numerical Study with Coupled Geomechanics-Hydrate Reaction-Multiphase Fluid Flow Model," Energies, MDPI, vol. 13(7), pages 1-21, April.

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