$\begin{array}{l}\displaystyle R_s(p, T) = c_1 \, \gamma_g \, p^{c_2} \, \exp \left[ \frac{c_3 \, \gamma_{API}}{T + 459.67} \right]\end{array}$

$\begin{array}{l}\gamma_{API} \leq 30 \ {\rm API} : \quad c_1 = 0.0362, \, c_2 = 1.0937, \ c_3 = 25.7240\end{array}$

$\begin{array}{l}\gamma_{API} > 30 \ {\rm API} : \quad c_1 = 0.0178, \, c_2 = 1.1870, \ c_3 = 23.9310\end{array}$

where

$\begin{array}{l}p\end{array}$	psia	Fluid pressure
$\begin{array}{l}T\end{array}$	°F	Fluid 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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