$\begin{array}{l}p_b = c_1 \, R_s^{c_2} \,\gamma_g^{c_3} \, \gamma_o^{c_4} \, T^{c_5}\end{array}$

$\begin{array}{l}c_1 = 5.38088 \cdot 10^{-3}, \ c_2 = 0.715082, \ c_3 = -1.877840 , \ c_4 = 3.1437, \ c_5 = 1.32657\end{array}$

where

$\begin{array}{l}p\end{array}$	psia	Fluid pressure
$\begin{array}{l}T\end{array}$	°F	Initial formation temperature
$\begin{array}{l}\gamma_{API}\end{array}$	°API	Oil API gravity
$\begin{array}{l}\gamma_o\end{array}$	frac	Oil specific gravity
$\begin{array}{l}\gamma_g\end{array}$	frac	Gas specific gravity

References

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