...
where
mean
water phase,
oil phase and
gas phase.
Some applications (like multi-phase pressure diffusion) account for the impact of phase exchange on the total compressibility which require some corrections to equation
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c_t(s,P) = c_r + c_w s_w + c_o s_o + c_g s_g + s_o [ R_{sp} + (c_r + c_o) R_{sn} ] + s_g [ R_{vp} + R_{vn}(c_r + c_g) ] |
See Non-linear multi-phase pressure diffusion @model for derivation of
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.See also
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[Compressibility] [Single-phase fluid compressibility]
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