The paper addresses enhanced oil recovery in chalk and sandstone rocks by CO2 injection, with different wettability, porosity, and\npermeability as well as injection rate and flooding conditions. Results indicate that an increase in Bond number has a positive\neffect on oil recovery whereas for capillary number, there is a limit in which recovery is improving. This limit is estimated when the\npressure drop by viscous force is approximately equal to the threshold balance between capillary and gravity forces.Adimensionless\ngroup is proposed that combines the effect of capillarity, injectionrate,permeability, andCO2 diffusion on the oil recovery. Recovery\nfrom all experiments in this study and reported data in the literature shows a satisfactory relationship with the proposed group.
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