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Convective Thermo-Poroelasticity in Non-Boiling Geothermal Reservoirs

Convective Thermo-Poroelasticity in Non-Boiling Geothermal Reservoirs. EGEE 520 Kate (Kritika Trakoolngam). Geothermal Energy. Alternative energy Geothermal reservoir Dual porosity medium. Thermal. Mechanical. Hydraulic (Effective stress). Governing Equations - I. Mechanical Behavior.

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Convective Thermo-Poroelasticity in Non-Boiling Geothermal Reservoirs

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  1. Convective Thermo-Poroelasticity in Non-Boiling Geothermal Reservoirs EGEE 520 Kate (Kritika Trakoolngam)

  2. Geothermal Energy • Alternative energy • Geothermal reservoir • Dual porosity medium

  3. Thermal Mechanical Hydraulic (Effective stress) Governing Equations - I • Mechanical Behavior Hooke’s Law

  4. Governing Equations - II • Compliance Matrix for discontinuous rock mass (Amadei & Goodman 1981) Normal stiffness of rock mass Shear stiffness of rock mass Fracture spacing

  5. Fluid mass transfer between matrix and fracture (Warren & Root 1963) Mechanical (Consolidation) Thermal (Volumetric strain) Governing Equations - III • Hydraulic Behavior Darcy’s Law (Advective flow) Matrix Fracture

  6. Mechanical (Volumetric strain) Convection Hydraulic Storage Governing Equations - III • Thermal Behavior Fick’s Law (Conduction)

  7. FEM Formulation

  8. Water Quartz Fracture Matrix Rock mass FEMLAB Solution • Models • Mechanical Stress-strain  u, v, w • Darcy’s Flow (matrix)  p1 • Darcy’s Flow (fracture)  p2 • Thermal conduction + convection (matrix)  cc1 • Thermal conduction + convection (fracture)  cc2 • Materials • Equation system • Mechanical (mat3_sE_1_1_*px+mat3_sE_1_2_*px+ mat3_sE_1_3_*px+ mat3_sE_1_4_*px+ mat3_sE_1_5_*px+ mat3_sE_1_6_*px)

  9. Matrix Fracture Validation • Displacements • Flow velocity • Heat flux

  10. Parametric Results • Heat Flux • Thermal expansion Temp ~ 150 c Heat flux 1000 MW/m2 Cold water

  11. Conclusions • FEMLAB • Flexibility • Functionality

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