$\begin{array}{l}B_o(p, T) = 0.497069 + 0.862963 \cdot 10^{-3} \, T + 0.182594 \cdot 10^{-2} \, F + 0.318099 \cdot 10^{-5} \, F^2\end{array}$

$\begin{array}{l}F =R_s^a(p, T) \, \gamma_g^b \, \gamma_o^c\end{array}$

$\begin{array}{l}a = 0.742390, \, b = 0.323294, \, c = -1.202040\end{array}$

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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