$\begin{array}{l}\displaystyle p_b = a \, R_s^b \,\gamma_g^c \, \gamma_o^d \, T^e\end{array}$

$\begin{array}{l}a = 5.38088 \cdot 10^{-3}, \ b = 0.715082, \ c = -1.877840 , \ d = 3.1437, \ e = 1.32657\end{array}$

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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