Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production

Eitan Cohen, Assaf Klar and Koji Yamamoto
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Eitan Cohen: Faculty of Civil and Environmental Engineering, Technion—IIT, Haifa 32000, Israel
Assaf Klar: Faculty of Civil and Environmental Engineering, Technion—IIT, Haifa 32000, Israel
Koji Yamamoto: Japan Oil, Gas and Metals National Corporation (JOGMEC), Tokyo 105-0001, Japan

Energies, 2019, vol. 12, issue 11, 1-16

Abstract: Past experience of gas production from methane-hydrate-bearing sediments indicates that sand migration is a major factor restricting the production of gas from methane-hydrate reservoirs. One important geotechnical aspect of sand migration is the influence of grain detachment on the existing stresses. This paper focuses on understanding and quantifying the nature of this aspect using different approaches, with a focus on discrete element method (DEM) simulations of sand detachment from hydrate-bearing sand samples. The investigation in the paper reveals that sand migration affects isotropic and deviatoric stresses differently. In addition, the existence of hydrate moderates the magnitude of stress relaxation. Both of these features are currently missing from continuum-based models, and therefore, a new constitutive model for stress relaxation is suggested, incorporating the research findings. Model parameters are suggested based on the DEM simulations. The model is suitable for continuum mechanics-based simulations of gas production from hydrate reservoirs.

Keywords: gas hydrate; sand migration; sand production; stress relaxation; discrete element method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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