TOUGH+ROCMECH for the Analysis of coupled Flow, Thermal, Geomechanical and Geophysical Processes — Code Description and Applications to Tight/Shale Gas Problems Jihoon Kim, George J. Moridis , John Edmiston, Evan S. Um, Ernest Majer Earth Sciences Division, Lawrence Berkeley National Laboratory 24 Mar. 2014 1
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TOUGH+ROCMECH for the Analysis of coupled Flow, Thermal, Geomechanical and Geophysical Processes — Code Description and Applications to Tight/Shale
Gas Problems
Jihoon Kim, George J. Moridis , John Edmiston, Evan S. Um, Ernest Majer
Earth Sciences Division, Lawrence Berkeley National Laboratory
24 Mar. 20141
Tight & Shale Gas
• One of the potential energy resources– (500~1000 Tcf)
• Fracture: highly deformable– Pore volume & permeability closely related to
geomechanics• Rigorous modeling in coupled flow
and geomechanics required
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Outlines
TOUGH+ROCMECH, T+Mo ROCMECHo Coupling to TOUGH+
Shale/tight gas Simulationo Hydraulic Fracturingo Electromagnetic (EM) simulationo Microearthquake(MEQ) Simulationo Failure along the vertical wello Failure during gas production
Ongoing Research
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ROCMECH
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• Written in Fortran 95• Employ the finite element method• Plasticity ModelingShear failure, (Mohr-Coulomb model)Tensile failure, (Node splitting method)
• Plane Strain 2D & Full 3D versions• Sequentially coupled to TOUGH family
codes (flow simulators)
Input Files
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• RM_Input_3D (_2D)Number of unknowns, Materials, Monitoring points, other
control parameters
• ELEME_NODE_3D (_2D)Connectivity of nodes & elements in FEM, Coordinates,
Initial total stress, boundary conditions
• IntFACE Pres Sat T 3D (_2D) Connectivity between flow & geomechanics, Initial
pressure & saturation, Assignment of the materials
• Flow_MINC_CONNE, MINC ROCK Connectivity for the multiple continuum approach,
Assignment of the materials
Why a Sequential Method?
Desirable from a software development perspective Fully coupled method: extremely expensive ($$) &
Computational efficiency issues
Making use of existing robust simulators(e.g., mechanical and flow simulators)
Implement interface code only
Competitive with fully coupled methodMust deal effectively with issues related to accuracy,