A property characterising agility of the multi-phase fluid under pressure gradient with account of relative permeability and dynamic fluid viscosity:

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M_{r}(s) = \frac{M}{k_{air}} = \sum_\alpha M_{r \alpha}(s)

where

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body	M

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body	M_{r, \alpha}

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body	\alpha

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body	k_{air}

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body	s

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body	\{ s_w, \, s_o, \, s_g \}

In most practical case of a 3-phase fluid model this will be:

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M_{r}(s) = M_{r o}(s) + M_{r g}(s) + M_{r g}(s)

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body	\displaystyle M_{ro} = \frac{k_{ro}}{\mu_o}

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body	\displaystyle M_{rg} = \frac{k_{rg}}{\mu_g}

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body	\displaystyle M_{rw} = \frac{k_{rw}}{\mu_w}

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