In Porous Media
In porous media, capillary pressure is the force necessary to squeeze a hydrocarbon droplet through a pore throat (works against the interfacial tension between oil and water phases) and is higher for smaller pore diameter. The expression for the capillary pressure remains as before, i.e., However, the quantities, and are quantities that are obtained by averaging these quantities within the pore space of porous media either statistically or using the volume averaging method.
The Brooks-Corey correlation for capillary pressure reads
where is the entry capillary pressure, is the pore-size distribution index and is the normalized water saturation (see Relative permeability)
Read more about this topic: Capillary Pressure
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