3-phase RPM @model for intermediate wet or oil-wet systems.

(1)	$\begin{array}{l}\displaystyle k_{rw}(s_w, s_o, s_g) = \frac{(s_o - s_{orw}) \, k_{rwo}(s_w) + (s_g - s_{gcw}) \, k_{rwg}(s_o) }{ (s_o - s_{orw}) + (s_g - s_{gcw}) }\end{array}$

(2)	$\begin{array}{l}\displaystyle k_{rg}(s_w, s_o, s_g) = \frac{(s_w - s_{wi}) \, k_{rgw}(s_g) + (s_o - s_{org}) \, k_{rgo}(s_g) }{ (s_w - s_{wi}) + (s_o - s_{org}) }\end{array}$

(3)	$\begin{array}{l}\displaystyle k_{ro}(s_w, s_o, s_g) = \frac{(s_w - s_{wi}) \, k_{row}(s_w) + (s_g - s_{goc}) \, k_{rog}(s_o) }{ (s_w - s_{wi}) + (s_g - s_{goc}) }\end{array}$

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