The difference between phase pressures due to difference in fluids interaction with rock matrix:
Capillary pressure is a function of reservoir saturation, permeability and wettability.
One of the strong assumptions in reservoir fluid dynamic modelling is that 3-phase capillary pressure is a function of one saturation only:
Mathematical model of capillary pressure is given by interpolation of laboratory data and also by a number of physical and empirical capillary pressure correlations
Physics / Fluid Dynamics / Percolation
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Field Study & Modelling
Capillary pressure @model