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A MUltiple Space and Time scale approach for the quAntification of deep saliNe formations for CO2 storaGe

Work package 5 Processes

WP leader

The overall objective of this WP is to provide a comprehensive framework, in the form of process models, for the description of the major processes occurring during the injection of CO2 into a brine-containing formation and the interactions that will take place between the injected CO2, the solid matrix and the liquid in the formation. This will enable the investigation of:
  • the relative significance of the various processes under different conditions, and
  • the behavior of the system as a whole, in response to various scenarios.

Work progress (March 2011)
  • The properties of the CO2 and brine were reviewed, including the equation of state of the CO2, the constitutive relationships for the relevant properties of the CO2 and the brine and their mixture (density, viscosity and enthalpy) and their dependence on state variables (temperature, pressure and concentration).
  • A review of possible interactions in the system rock matrix-CO2 (various phases) and brine , and the coupling between them was carried out. This represents backbone of the processes to be formulated.
  • Formulation of the processes during CO2 injection and storage in a saline formation, including: two-phase fluxes (advection, dispersion and diffusion); heat fluxes; dissolution processes (brine in CO2 and CO2 in brine); interphase mass exchanges and transfer; chemical reactions and phase partitioning; hydro-mechanical effects and fracture generation; mixing and spreading and the associated fingering resulting from density, viscosity and capillary forces contrasts; and finally hydrothermal and thermo-mechanical processes.
  • Identification of the major knowledge and information gaps
  • Formulation of process models for flow, transport and reactive processes completed and for hydromechanical processes underway
  • Progress presented in Deliverables D051, D052 and D053

Simulation of time evolution of dissolved CO2 concentration
Source: MUSTANG elaboration

©Mustang - 2009