Model Formulation for Compositional Numerical Simulation of CO2
Flooding in Fractured Reservoirs

doi:10.11885/j.issn.1674-5086.2012.12.20.03

Abstract

Abstract:

Compositional simulation is required in evaluating CO2 flooding in EOR operations when black-oil simulation is
no longer adequate. A three-phase compositional modeling approach for CO2 flooding in fractured reservoirs is presented. The
mathematical models and formulations are given. A generalized multi-continuum approach is adopted to handle transport in
naturally fractured reservoirs and the mass flux of each mass component is contributed by advection and diffusion processes.
The multiphase fluid flow is described by Darcy equation，and the diffusion of multi-component is described by Fick′s law.
The precipitation of heavy oil components and absorption of CO2 on the solid grains are modeled based on reversible nonlinear
isotherm. The permeability reduction effects due to asphaltene deposition are considered by a tubes-in-series model. The
governing partial differential equations for conservation of each component are discretized using an integral finite differences
method and solved fully implicitly by Newton iteration. The equation of state (EOS) by Soave-Redlich-Kwong is used to
calculate the physical properties of fluids. Three methods of three-phase equilibrium calculation for hydrocarbon-water-CO2
mixtures，K-value approach，flash calculation and Gibbs energy minimization are also presented.

Key words: numerical simulation, compositional model, carbon dioxide flooding, fractured reservoirs, phase equilibrium

Di Yuan1*, Wu Yushu2, Ju Binshan3. Model Formulation for Compositional Numerical Simulation of CO2
Flooding in Fractured Reservoirs[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.12.20.03.

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