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Modeling of Rock Structure Changes due to Stress Induced by CO 2 Sequestration. EGEE 520 – 2007 Denis Pone. Introduction . Geo-sequestration of CO 2 is one of the most attractive option to reduce the increase emissions of greenhouse gases into the atmosphere.

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modeling of rock structure changes due to stress induced by co 2 sequestration

Modeling of Rock Structure Changes due to Stress Induced by CO2 Sequestration

EGEE 520 – 2007

Denis Pone

introduction
Introduction
  • Geo-sequestration of CO2 is one of the most attractive option to reduce the increase emissions of greenhouse gases into the atmosphere.
  • CO2 injection into geological formations may give rise to a variety of unexpected chemical, and physical processes.
  • The permeability, the porosity and the storage capacity, which are reservoir key parameters, can then fluctuate due to CO2-rock interactions
  • Holloway, Energy Conversion and Management 1997, 38, (Supplement 1), S193-S198.
  • White, et al., Energy and Fuels 2005, 19, (3), 659-724.
governing equations
Governing Equations
  • Stress-strain and Hydromechanics
  • Thermo-Mechanical Equation
  • Fluid Flow and Mechanical Strain Equation
  • Fluid Flow and Mechanical Strain Equation
model formulation
Model Formulation
  • Chemical Engineering Module Momentum balance Darcy law
  • Multiphysics Module Heat transfer by conduction
  • Structural Mechanic Module Axial symmetry strain-stress

CO2

Rock

3D to 2D

comsol solution
COMSOL Solution

Effect of stresses on the rock structure

Effect of temperature on the rock structure

comsol solution6
COMSOL Solution

Combined stress, thermal and flow effects on the rock structure

model validation
(a)

(b)

Model Validation

(a) Distribution of normalized fracture width for combined thermo-elastic and poro-elastic effects at various times. (b) Total displacement along the structure model with COMSOL

Ghassemi, Journal of Engineering Mechanics-Asce 2006, 132, (1), 26-33

conclusions
Conclusions
  • The model developed qualitatively described the behavior of the rock due to THM interactions as expected.
  • Most of the physical parameters used in this study, although realistic, were chosen arbitrary.
  • It is important to use specific rock parameter in order to access the stability of the model.
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