Journal
ENERGIES
Volume 12, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/en12112131
Keywords
gas hydrate; sand migration; sand production; stress relaxation; discrete element method
Categories
Funding
- Research Consortium for Methane Hydrate Resources in Japan [MH21]
- Ministry of Economic, Trade and Industry (METI), through Japan Oil, Gas and Metals National Corporation (JOGMEC)
- Technion-Israel Institute of Technology [2020489]
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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.
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