Oil isothermal compressibility, c_o(p)	bbl/stb	$\begin{array}{l}c_o(p) = \exp X(p), \quad X(p) = с_1 + с_2 \, \ln p + c_3 \, \ln p_b + c_4 \, \ln T + c_5 \, \ln \gamma_{API} + c_6 \,\ln Rsb\end{array}$ $\begin{array}{l}c_1 = −7.573 \ , \ c_2 = − 1.45 \ , \ c_3 = − 0.383 \ , \ c_4 = 1.402 \ , \ c_5 = 0.256 \ , \ c_6 = 0.449\end{array}$

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	Gas Solubility at Bubble point pressure
$\begin{array}{l}p_b\end{array}$	psia	Bubble point pressure

References

McCain, W.D.; Spivey, J.P.; Lenn, C.P. Petroleum Reservoir Fluid Property Correlations; PennWell Books: Tulsa, OK, USA, 2011, ISBN-13: 978-1593701871

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