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The negative side effect of the flooding with CO2 is asphaltene deposition; while little work was reported in the literature on asphaltene precipitation due to CO2 flooding in presence of light components. The main objective in this paper is to address asphaltene precipitation for oil containing methane and propane due to CO2 flooding at different miscibility conditions. Experimental measured asphaltene deposition due to miscible CO2 injection is compared with corresponding values estimated by proposed model. It is shown that there is a critical concentration of CO2, where below it; solubility parameter of the liquid is enhanced, hence preventing asphaltene from depositing. The first objective of the paper is to address an approach which is based on solubility parameters/CO2 fraction in the liquid to qualitatively assess stability/instability region for the asphaltene. The second objective is to quantitatively compare the predicted and experimental results. It is shown that the higher CO2 flooding pressure and temperature, the more deposited asphaltene. It was also shown that a higher risk for asphaltene deposition in case of chalk cores than for sandstone cores.

Evaluation of Asphaltene Stability During CO2 Flooding at Different Miscible Conditions and Presence of Light Components