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@wikipedia


The difference between phase pressures due to difference in fluids interaction with rock matrix:

(1) p_{cog} = p_o - p_g


oil
-gas capillary pressure

(2) p_{cow} = p_o - p_w


oil
-water
capillary pressure


Capillary pressure is a function of reservoir saturationpermeability 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:

(3) p_{cog} = p_{cog}(s_o)


a function of oil saturation only s_o

(4) p_{cow} = p_{cow}(s_w)


a function of water saturation only
s_w


Mathematical model of capillary pressure is given by interpolation of laboratory data and also by a number of physical and empirical capillary pressure correlations


See also


Physics /  Fluid Dynamics / Percolation

Petroleum Industry / Upstream / Subsurface E&P Disciplines / Field Study & Modelling 

Capillary pressure @model


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