Effects of methane hydrate gas production on mechanical responses of hydrate bearing sediments in local production region at Eastern Nankai Trough

2014 ◽  
pp. 1707-1712 ◽  
Author(s):  
M Zhou ◽  
K Soga ◽  
E Xu ◽  
K Yamamoto
Keyword(s):  
Methane Hydrate ◽  
Nankai Trough ◽  
Gas Production ◽  
Local Production ◽  
Production Region ◽  
Mechanical Responses ◽  
Hydrate Bearing Sediments

Geomechanical Responses During Gas Hydrate Production Induced by Depressurization

2016 ◽  
Author(s):  
Ah-Ram Kim ◽  
Gye-Chun Cho ◽  
Joo-Yong Lee ◽  
Se-Joon Kim
Keyword(s):  
Methane Hydrate ◽  
Fossil Fuel ◽  
Gas Production ◽  
Field Scale ◽  
Production Well ◽  
Physical Processes ◽  
Hydrate Dissociation ◽  
Thermal Changes ◽  
New Energy ◽  
Hydrate Bearing Sediments

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.

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

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2131 ◽  
Author(s):  
Eitan Cohen ◽  
Assaf Klar ◽  
Koji Yamamoto
Keyword(s):  
Stress Relaxation ◽  
Methane Hydrate ◽  
Gas Production ◽  
Model Parameters ◽  
Dem Simulations ◽  
Research Findings ◽  
Geotechnical Aspect ◽  
Deviatoric Stresses ◽  
Hydrate Bearing Sediments ◽  
Hydrate Reservoirs

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.

scholarly journals The second offshore production of methane hydrate in the Nankai Trough and gas production behavior from a heterogeneous methane hydrate reservoir

RSC Advances ◽  
2019 ◽  
Vol 9 (45) ◽  
pp. 25987-26013 ◽  
Author(s):  
K. Yamamoto ◽  
X.-X. Wang ◽  
M. Tamaki ◽  
K. Suzuki
Keyword(s):  
Data Acquisition ◽  
Methane Hydrate ◽  
Nankai Trough ◽  
Gas Production ◽  
Hydrate Reservoir ◽  
Offshore Production ◽  
Production Behavior ◽  
Data Acquisition Program ◽  
Made In

The second gas production attempt from a methane hydrate (MH) deposit in the eastern Nankai Trough area was made in 2017 with the intensive data acquisition program, and it revealed effects of reservoir characters on the MH dissociation behaviors.

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