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

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

Energy, 2023, vol. 275, issue C

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.

Keywords: Hydrate; Creep tests; Dissociation process; Depressurization; Clayey (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (9)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:275:y:2023:i:c:s0360544223009210

DOI: 10.1016/j.energy.2023.127527

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