A chemo-thermo-mechanically coupled numerical simulation of the subsurface ground deformations due to methane hydrate dissociation

Kimoto, Sayuri; Oka, Fusao; Fushita, Tomohiko; Fujiwaki, Masaya

doi:10.1016/j.compgeo.2007.02.006

Cited by 136 publications

(62 citation statements)

References 18 publications

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“…Recently, a research group led by Professor Kimoto [9,10] from Kyoto University, Japan, reported studies on gas production from gas hydrates considering bed deformation. They proposed a model based on chemothermomechanically coupled analysis which could predict the deformation of sediment; they did not report the gas production under this condition.…”

Section: Current Scenariomentioning

confidence: 99%

Effect of Bed Deformation on Natural Gas Production from Hydrates

Pallipurath¹

2013

Journal of Petroleum Engineering

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This work is based on modelling studies in an axisymmetric framework. The thermal stimulation of hydrated sediment is taken to occur by a centrally placed heat source. The model includes the hydrate dissociation and its effect on sediment bed deformation and resulting effect on gas production. A finite element package was customized to simulate the gas production from natural gas hydrate by considering the deformation of submarine bed. Three sediment models have been used to simulate gas production. The effect of sediment deformation on gas production by thermal stimulation is studied. Gas production rate is found to increase with an increase in the source temperature. Porosity of the sediment and saturation of the hydrate both have been found to significantly influence the rate of gas production.

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Section: Current Scenariomentioning

confidence: 99%

Effect of Bed Deformation on Natural Gas Production from Hydrates

Pallipurath¹

2013

Journal of Petroleum Engineering

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“…In this study, skeleton stress (Jommi, 2000;Gallipoli et al, 2003) is used for the stress variable in the constitutive relation for the soil skeleton (Oka et al, 2006(Oka et al, , 2008b(Oka et al, , 2010Kimoto et al, 2007). The total stress tensor is assumed to be composed of three partial stresses for each phase.…”

Section: Skeleton Stressmentioning

confidence: 99%

“…In the MPM, constitutive equations can be easily applied because history-dependent variables, such as plastic strain and strain-hardening parameters, are carried by each material point. As the stress variable of the constitutive model, skeleton stress (Jommi, 2000;Gallipoli et al, 2003) is used to describe the mechanical behavior of unsaturated soils (Oka et al, 2006(Oka et al, , 2008b(Oka et al, , 2010Kimoto et al, 2007). For the full description of the behavior of unsaturated soil, it is necessary to incorporate the suction in the constitutive model.…”

Section: Introductionmentioning

confidence: 99%

A Coupled MPM-FDM Analysis Method for Multi-Phase Elasto-Plastic Soils

Higo

Oka

Kimoto

et al. 2010

Soils and Foundations

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The Material Point Method (MPM), as proposed by Sulsky et al. (1994), has been developed to simulate large deformations and failure evolution involving diŠerent material phases in a single computational domain. A continuum body is divided into aˆnite number of subregions represented by Lagrangian material points, while the governing equations are formulated and solved with the Eulerian grid. Since this grid can be chosen arbitrarily, mesh tangling does not appear in the MPM. To design a simple but robust spatial discretization procedure, the MPM is coupled with theˆnite diŠerence method (FDM) in the present study for simulating fully and partially saturated elasto-plastic soil responses based on the simpliˆed three-phase method. Governing equations for the soil skeleton and the pore ‰uid are discretized by the MPM and FDM, respectively. Soil-water coupled analyses for fully saturated soils and seepage-deformation coupled analyses for unsaturated soils are performed, and the potential of the proposed method is demonstrated via numerical examples.

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“…The state of knowledge on the subject is embryonic at best, because the general dearth of information is compounded by the significant geomechanical complication of the "stiff" permafrost overburden. Although the geomechanical response of marine hydrate deposits with compressible overburdens has received some attention in the past (Kimoto et al, 2007;, this analysis of permafrost systems is (to the best of our knowledge) the first study of its kind.…”

Section: Objective and Approachmentioning

confidence: 99%

Geomechanical response of permafrost-associated hydrate deposits to depressurization-induced gas production

Rutqvist

Moridis

Grover

et al. 2009

Journal of Petroleum Science and Engineering

193

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In this simulation study, we analyzed the geomechanical response during depressurization production from two known hydrate-bearing permafrost deposits: the Mallik (Northwest Territories, Canada) deposit and Mount Elbert (Alaska, USA) deposit. Gas was produced from these deposits at constant pressure using horizontal wells placed at the top of a hydrate layer (HL), located at a depth of about 900 m at the Mallik and 600 m at the Mount Elbert.The simulation results show that general thermodynamic and geomechanical responses are similar for the two sites, but with substantially higher production and more intensive geomechanical responses at the deeper Mallik deposit. The depressurization-induced dissociation begins at the well bore and then spreads laterally, mainly along the top of the HL.The depressurization results in an increased shear stress within the body of the receding hydrate and causes a vertical compaction of the reservoir. However, its effects are partially mitigated by the relatively stiff permafrost overburden, and compaction of the HL is limited to less than 0.4%. The increased shear stress may lead to shear failure in the hydrate-free zone bounded by the HL overburden and the downward-receding upper dissociation interface. This zone undergoes complete hydrate dissociation, and the cohesive strength of the sediment is low. We determined that the likelihood of shear failure depends on the initial stress state as well as on the geomechanical properties of the reservoir. The Poisson's ratio of the hydratebearing formation is a particularly important parameter that determines whether the evolution of the reservoir stresses will increase or decrease the likelihood of shear failure.

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A chemo-thermo-mechanically coupled numerical simulation of the subsurface ground deformations due to methane hydrate dissociation

Cited by 136 publications

References 18 publications

Effect of Bed Deformation on Natural Gas Production from Hydrates

Effect of Bed Deformation on Natural Gas Production from Hydrates

A Coupled MPM-FDM Analysis Method for Multi-Phase Elasto-Plastic Soils

Geomechanical response of permafrost-associated hydrate deposits to depressurization-induced gas production

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