Methane hydrate has been received large attention as a new energy source instead of oil and fossil fuel. However, there is high potential for geomechanical stability problems such as marine landslides, seafloor subsidence, and large volume contraction in the hydrate-bearing sediment during gas production induced by depressurization. In this study, a thermal-hydraulic-mechanical coupled numerical analysis is conducted to simulate methane gas production from the hydrate deposits in the Ulleung basin, East Sea, Korea. The field-scale axisymmetric model incorporates the physical processes of hydrate dissociation, pore fluid flow, thermal changes (i.e., latent heat, conduction and advection), and geomechanical behaviors of the hydrate-bearing sediment. During depressurization, deformation of sediments around the production well is generated by the effective stress transformed from the pore pressure difference in the depressurized region. This tendency becomes more pronounced due to the stiffness decrease of hydrate-bearing sediments which is caused by hydrate dissociation.
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ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering
June 19–24, 2016
Busan, South Korea
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4999-6
PROCEEDINGS PAPER
Geomechanical Responses During Gas Hydrate Production Induced by Depressurization
Ah-Ram Kim,
Ah-Ram Kim
Korean Advanced Institute of Science and Technology, Daejeon, Korea
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Gye-Chun Cho,
Gye-Chun Cho
Korean Advanced Institute of Science and Technology, Daejeon, Korea
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Joo-Yong Lee,
Joo-Yong Lee
Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea
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Se-Joon Kim
Se-Joon Kim
Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea
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Ah-Ram Kim
Korean Advanced Institute of Science and Technology, Daejeon, Korea
Gye-Chun Cho
Korean Advanced Institute of Science and Technology, Daejeon, Korea
Joo-Yong Lee
Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea
Se-Joon Kim
Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea
Paper No:
OMAE2016-54217, V008T11A004; 7 pages
Published Online:
October 18, 2016
Citation
Kim, A, Cho, G, Lee, J, & Kim, S. "Geomechanical Responses During Gas Hydrate Production Induced by Depressurization." Proceedings of the ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology. Busan, South Korea. June 19–24, 2016. V008T11A004. ASME. https://doi.org/10.1115/OMAE2016-54217
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