Water phase pressure = pw

Reservoir pressure of the water phase $\begin{array}{l}p_w\end{array}$ :

(1)	$\begin{array}{l}\displaystyle p_w= p + \frac{1}{3}(-2P_{cow}+P_{cog})\end{array}$

(2)	$\begin{array}{l}\displaystyle p_w= p - \frac{1}{2} \, P_{cow}\end{array}$

(3)	$\begin{array}{l}\displaystyle p_w= p - \frac{1}{2} \, P_{cgw}\end{array}$

where

$\begin{array}{l}p\end{array}$	Average phase pressure
$\begin{array}{l}P_{cow}\end{array}$	Oil-Water capillary pressure
$\begin{array}{l}P_{cgw}\end{array}$	Gas-Water capillary pressure

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