The thermodynamic equilibrium of the reservoir fluids may end up with the pressure difference between fluid phases (called capillary pressure) due to difference in fluids interaction with rock matrix. interaction with rocks:
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| P_{cow} = p_o - p_w |
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| P_{cog} = p_o - p_g |
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| P_{cgw} = p_g - p_w |
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whereIn 3-phase fluid model this will be:
Some engineering applications make fair use of the concept of Average phase pressure
:
See also
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Natural Science / Physics / Fluid Dynamics / Percolation
[ Capillary pressure ] [ Average phase pressure ] [ Oil phase pressure ][ Gas phase pressure ][ Water phase pressure ]