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| Abstract |
Carbon dioxide (CO2) flooding by immiscible gas drive has increasingly gained prominence in production operations to address the challenging recovery of residual heavy crude oils. Moreover, at its sup...ercritical state, supercritical CO2 (sCO2) exhibits singular attractive properties for petroleum industry including a low viscosity and high diffusivity. However, it is well-documented that injection of CO2 triggers the deposition of heavy fractions i.e. asphaltenes /resins causing a subsequent reduction of reservoir formation porosity, alteration of rock wettability as well as wellbore plugging. In this paper, we are highlighting the relationship between the solubility of sCO2 and asphaltene. A heavy crude oil (API 11.5) was used as raw material. The experiments included a modified ASTM D3279 method which aimed at estimating the amount of asphaltene content in the dead sample and PVT test that accounted the solubility of sCO2. Using experimental data and thermodynamic model, the extent to which equilibrium temperature that influences asphaltene deposition was studied. Also in this study, we have proposed a correlation between asphaltene solubility and heavy oil swelling, both prompted by solubility sCO2. The kinetics and the stability of the equilibrium of intermolecular forces developed between sCO2 and dead oil composition during the development of the miscibility front were also investigated in respect of sCO2 solubility and-bubble point pressures.show more
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