The difference between phase pressures due to difference in fluids interaction with rock martix:
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p_{cog} = p_o - p_g |
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p_{cow} = p_o - p_w |
One of the string assumptions in fluid dynamic modelling is that capillary pressure is a function of saturation only:
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p_{cog} = p_{cog}(s_o) |
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p_{cow} = p_{cow}(s_w) |
Pcog
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