Convective Thermo-Poroelasticity in Non-Boiling Geothermal Reservoirs

1
Convective Thermo-Poroelasticity in Non-Boiling
Geothermal Reservoirs

• EGEE 520
• Kate
• (Kritika Trakoolngam)

2
Geothermal Energy

• Alternative energy
• Geothermal reservoir
• Dual porosity medium

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Governing Equations - I

• Mechanical Behavior

Hookes Law
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Governing Equations - II

• Compliance Matrix for discontinuous rock mass
  (Amadei Goodman 1981)

Normal stiffness of rock mass
Shear stiffness of rock mass
Fracture spacing
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Governing Equations - III

• Hydraulic Behavior

Darcys Law (Advective flow)
Matrix
Fracture
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Governing Equations - III

• Thermal Behavior

Ficks Law (Conduction)
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FEM Formulation
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FEMLAB Solution

• Models
• Mechanical Stress-strain ? u, v, w
• Darcys Flow (matrix) ? p1
• Darcys Flow (fracture) ? p2
• Thermal conduction convection (matrix) ? cc1
• Thermal conduction convection (fracture) ? cc2
• Materials
• Equation system
• Mechanical

(mat3_sE_1_1_pxmat3_sE_1_2_px
mat3_sE_1_3_px mat3_sE_1_4_px
mat3_sE_1_5_px mat3_sE_1_6_px)
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Validation

• Displacements
• Flow velocity
• Heat flux

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Parametric Results

• Heat Flux
• Thermal expansion

Temp 150 ?c
Heat flux 1000 MW/m2
Cold water
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Conclusions

• FEMLAB
• Flexibility
• Functionality