(1)	$\begin{array}{l}\displaystyle \phi_e (p_i) \, c_t(p_i) \, p_i - \phi_e(p) \, c_t(p) \, p(t) = (A_e \cdot h_e)^{-1} \left[ q_t - B_w q_{WI} - B_g q_{GI} \right]\end{array}$

where

$\begin{array}{l}p(t)\end{array}$	formation pressure at time moment t
$\begin{array}{l}p_i = p(0)\end{array}$	initial formation pressure
$\begin{array}{l}\phi_e\end{array}$	effective porosity
$\begin{array}{l}A_e\end{array}$	drainage area
$\begin{array}{l}h_e\end{array}$	effective formation thickness
$\begin{array}{l}q_t\end{array}$	total sandface flowrate $\begin{array}{l}q_t = B_w \, q_W + (B_o - R_s \, B_g) \, q_O + (B_g - R_v \, B_o) \, q_G\end{array}$

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