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Experimental Investigation on Deformation and Permeability of Clayey–Silty Sediment during Hydrate Dissociation by Depressurization

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  • Fang Jin

    (School of Engineering and Technology, China University of Geosciences, Beijing 100083, China)

  • Feng Huang

    (School of Engineering and Technology, China University of Geosciences, Beijing 100083, China)

  • Guobiao Zhang

    (School of Engineering and Technology, China University of Geosciences, Beijing 100083, China)

  • Bing Li

    (School of Engineering and Technology, China University of Geosciences, Beijing 100083, China)

  • Jianguo Lv

    (School of Engineering and Technology, China University of Geosciences, Beijing 100083, China)

Abstract

The sediments in the South China sea are mainly composed of clayey silt, characterized by weak cementation, low strength, and poor permeability. These characteristics lead to slow gas and water transport and low gas production efficiency in the production process, which is not conducive to reservoir stability. Therefore, this paper studied the influence of different factors on the displacement and permeability of hydrate-bearing sediments by using remolded cores from the South China Sea. It was found that, when the depressurization method was used for hydrate decomposition, the displacement change in sediments could be divided into three stages: depressurization stage, decomposition stage, and creep stage. During the decompression stage, sediment deformation was rapid and displacement was small. During the decomposition process of hydrates, sediment deformation was slow and displacement was maximum. The creep stage had the slowest deformation and the smallest displacement. The displacement increased with the increase in initial porosity, hydrate saturation, effective pressure, and depressurization amplitude. The permeability of the sediments was lower than that of the original sediments after hydrate decomposition. This permeability damage increased with the increase in the sediment porosity, hydrate saturation, depressurization range and effective pressure. Furthermore, the displacement of sediments was positively correlated with the permeability damage.

Suggested Citation

  • Fang Jin & Feng Huang & Guobiao Zhang & Bing Li & Jianguo Lv, 2023. "Experimental Investigation on Deformation and Permeability of Clayey–Silty Sediment during Hydrate Dissociation by Depressurization," Energies, MDPI, vol. 16(13), pages 1-15, June.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:13:p:5005-:d:1181701
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    References listed on IDEAS

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