For multiphase fluid in thermodynamic equilibrium at a given pressure
and temperature the total fluid compressibility is:| LaTeX Math Block |
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c_f(p, T) = \sum_{\alpha} s_\alpha c_\alpha |
where
| -phase saturation, subjected to | LaTeX Math Inline |
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| body | \sum_{\alpha} s_\alpha = 1 |
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| LaTeX Math Inline |
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| body | c_\alpha = c_\alpha(p, T) |
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| -phase compressibility as function of pressure and temperature |
In ,ost popular practical case of 3-phase fluid model this will beIn case the fluid phases have the same pressure the compressibility of multi-phase fluid can be expressed via compressibilities of single-phase fluids as:
| LaTeX Math Block |
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c_f(p) = c_w(p) \, s_w + c_o(p) \, s_o + c_g(p) \, s_g |
where
mean water phase, oil phase and gas phase.
See also
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Compressibility (multi-phase fluid) @model
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