(1)	$\begin{array}{l}\displaystyle \frac{q}{q_{\rm max}} = 1 - a \, \frac{p_{wf}}{p_r} - (1-a) \Bigg(\frac{p_{wf}}{p_r} \Bigg)^2 \quad , \quad p_b > p_r > p_{wf}, \quad \{ 0< a< 1 \}\end{array}$

where

$\begin{array}{l}q = q_O\end{array}$	surface production rate of rate
$\begin{array}{l}q_{\rm max}\end{array}$	Absolute Open Flow (AOL) for oil
$\begin{array}{l}p_{wf}\end{array}$	bottom-hole pressure (BHP)
$\begin{array}{l}p_r\end{array}$	drainarea formation pressure
$\begin{array}{l}p_b\end{array}$	bubble-point pressure
$\begin{array}{l}a\end{array}$	model parameter $\begin{array}{l}\{ 0< a< 1 \}\end{array}$

This is a generalisation of Vogel model and reduces to Vogel model for $\begin{array}{l}a = 0.2\end{array}$ .

References

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