An Investigation of Phase-Behavior/Macroscopic-Bypassing Interaction in CO2 Flooding

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Abstract
CO2 core floods and related high-resolution, mathematical simulations in which viscous fingering is represented explicitly indicate a synergistic interaction between multicontact CO2/crude phase behavior and macroscopic bypassing that causes ultimate oil recovery (when the system has been swept) to be lower in unstable displacements than in stable ones. If this effect is present in field applications, corefloods in which fingering is absent should not be used as direct indicators of field-scale CO2 flood displacement efficiency because they will yield optimistic predictions, all other factors being equal in the laboratory and the field.

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