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Article

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

by 1, 1,2,*,† and 3
1
Faculty of Civil and Environmental Engineering, Technion—IIT, Haifa 32000, Israel
2
Department of Civil Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
3
Japan Oil, Gas and Metals National Corporation (JOGMEC), Tokyo 105-0001, Japan
*
Author to whom correspondence should be addressed.
On sabbatical leave from the Technion—IIT.
Energies 2019, 12(11), 2131; https://doi.org/10.3390/en12112131
Received: 7 May 2019 / Revised: 28 May 2019 / Accepted: 2 June 2019 / Published: 4 June 2019
(This article belongs to the Special Issue Advances in Natural Gas Hydrates)
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. View Full-Text
Keywords: gas hydrate; sand migration; sand production; stress relaxation; discrete element method gas hydrate; sand migration; sand production; stress relaxation; discrete element method
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MDPI and ACS Style

Cohen, E.; Klar, A.; Yamamoto, K. Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production. Energies 2019, 12, 2131. https://doi.org/10.3390/en12112131

AMA Style

Cohen E, Klar A, Yamamoto K. Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production. Energies. 2019; 12(11):2131. https://doi.org/10.3390/en12112131

Chicago/Turabian Style

Cohen, Eitan, Assaf Klar, and Koji Yamamoto. 2019. "Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production" Energies 12, no. 11: 2131. https://doi.org/10.3390/en12112131

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