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

Abstract In order to predict ground deformations due to the dissociation of methane hydrates, we have developed a simulation method based on a chemo-thermo-mechanically coupled analysis. Within this method, the phase change from hydrates to fluids, the flow of pore water and gas, the mechanical behavior of the solid skeleton, and heat transfer can all be simultaneously solved. The numerical method is based on the finite element method using an updated Lagrangian formulation. Applying the proposed framework, we have numerically analyzed the dissociation process that occurs in the heating and depressurizing methods of natural gas production. It has been predicted that ground deformation is caused by the generation of water and gas during the dissociation process.

[1]  Alessandro Tarantino,et al.  Experimental Evidence and Theoretical Approaches in Unsaturated Soils , 2000 .

[2]  Cristina Jommi,et al.  Remarks on the constitutive modelling of unsaturated soils , 2000 .

[3]  V. Ghionna,et al.  Modeling and Mechanics of Granular and Porous Materials , 2002 .

[4]  F. Oka,et al.  A Finite Element Analysis of the Thermo-Hydro-Mechanically Coupled Problem of a Cohesive Deposit Using a Thermo-Elasto-Viscoplastic Model , 2007 .

[5]  Bernhard A. Schrefler,et al.  The effective stress principle: Incremental or finite form? , 1996 .

[6]  Nasser Khalili,et al.  A three-phase model for unsaturated soils , 2000 .

[7]  Takeshi Kodaka,et al.  An Elasto-Viscoplastic Model and Multiphase Coupled FE Analysis for Unsaturated Soil , 2006 .

[8]  M. Biot.  THEORY OF ELASTICITY AND CONSOLIDATION FOR A POROUS ANISOTROPIC SOLID , 1955 .

[9]  A. Gens,et al.  An elasto-plastic model for unsaturated soil incorporating the effects of suction and degree of saturation on mechanical behaviour , 2003 .

[10]  George G. Tsypkin,et al.  Mathematical Models of Gas Hydrates Dissociation in Porous Media , 2000 .

[11]  A. Bejan,et al.  Methane Hydrates in Porous Layers: Gas Formation and Convection , 2002 .

[12]  K. Terzaghi.  Theoretical Soil Mechanics , 1943 .

[13]  K. Soga,et al.  Coupled deformation-flow analysis for methane hydrate production by depressurized wells , 2005 .

[14]  R. de Boer,et al.  Theory of Porous Media — Past and Present , 1998 .

[15]  I. Vardoulakis.  Dynamic thermo-poro-mechanical analysis of catastrophic landslides , 2002 .

[16]  F. Oka,et al.  Numerical Analysis of Deformation of Methane Hydrated Contained Soil due to the Dissociation of Gas Hydrate , 2007 .

[17]  Jacob Bear,et al.  Transport Phenomena in Porous Media , 1998 .

[18]  M. Biot.  General Theory of Three‐Dimensional Consolidation , 1941 .

[19]  M. Biot.  THEORY OF DEFORMATION OF A POROUS VISCOELASTIC ANISOTROPIC SOLID , 1956 .

[20]  M. Biot.  Theory of Propagation of Elastic Waves in a Fluid‐Saturated Porous Solid. I. Low‐Frequency Range , 1956 .

[21]  Yoshihiro Tsuji,et al.  Overview of the MITI Nankai Trough Wells: A Milestone in the Evaluation of Methane Hydrate Resources , 2004 .

[22]  S. Leroueil,et al.  MODELLING TEMPERATURE AND STRAIN RATE DEPENDENT BEHAVIOR OF CLAYS : ONE DIMENSIONAL CONSOLIDATION , 1998 .

[23]  Yosuke Higo,et al.  Strain localization analysis of elasto-viscoplastic soil considering structural degradation , 2004 .

[24]  W. Ehlers.  Continuum and Numerical Simulation of Porous Materials in Science and Technology , 2002 .

[25]  Goodarz Ahmadi,et al.  Numerical solution for natural gas production from methane hydrate dissociation , 2004 .

[26]  Wolfgang Ehlers,et al.  Deformation and localization analysis of partially saturated soil , 2004 .

[27]  Antonio Gens,et al.  Finite element formulation and algorithms for unsaturated soils. Part I: Theory , 2003 .

[28]  Syed S. H. Rizvi,et al.  Kinetics of methane hydrate decomposition , 1987 .