Bubble point pressure	p_b	psia	$\begin{array}{l}\displaystyle p_b(T) = c_1 \cdot \left[ \left( \frac{R_{sb}}{\gamma_g} \right)^{c_2} \, 10^{-X }+ c_3 \right], \quad X = c_4 \, \gamma_{API} + c_5 \, T\end{array}$ $\begin{array}{l}c_1 = 18.2 \ , \ c_2 = 0.83 \ , \ c_3 = -1.4 \ , \ c_4 = 0.0125 \ , \ c_5 = -0.00091\end{array}$

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
$\begin{array}{l}R_{sb}\end{array}$	scf/stb	Maximum Gas Solubility

References

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