Micromechanical investigation of stress relaxation in gas hydrate-bearing sediments due to sand production

Eitan Cohen, Assaf Klar*, Koji Yamamoto

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

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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.
Original languageEnglish
Article number2131
JournalEnergies
Volume12
Issue number11
Number of pages16
ISSN1996-1073
DOIs
Publication statusPublished - 2019

Keywords

  • Gas hydrate
  • Sand migration
  • Sand production
  • Stress relaxation
  • Discrete element method

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