Oil Recovery as a function of Capillary Number:
When the residual oil saturation and the imbibition-drainage hysteresis remain a function of Capillary Number, whether the “non-wetting phase” relative permeability can’t be correlated with ‘Capillary Number’ as such albeit the dependence of non-wetting phase relative permeability on IFT and viscosity, individually? OR Is it that Capillary Number in a certain range may influence of non-wetting phase relative permeability either marginally or significantly?
What exactly decides the magnitude of the Critical Capillary Number for Oil-wet and Water-wet reservoirs (although, it is known the magnitude of Critical Capillary Number for Oi-wet reservoirs would remain orders of magnitude larger than that for a water-wet reservoir)?
Whether the concept of ‘theta’ (contact angle) for mixed or intermediate wettability (as very strong water-wet reservoirs remain very rare) remain the same as associated either with strongly water-wet or strongly oil-wet reservoirs?
In low-permeability reservoirs, whether the residual oil saturation could drop down to zero with continuous increase in Capillary Number?
Is there any (optimal) upper limit for the Capillary Number that will yield the maximum oil recovery during a chemical EOR – typically in a heterogeneous reservoir?
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