Oil isothermal compressibility, c_o(p)	bbl/stb	$\begin{array}{l}\displaystyle c_o(p) = с_1 \cdot R_{sb}^{c_2} \cdot \gamma_g^{c_3} \cdot \gamma_{API}^{c_4} \cdot T^{c_5} \cdot p^{c_6}\end{array}$ $\begin{array}{l}c_1 = 1.705 \cdot 10^{−7} \ , \ c_2 = 0.69357 \ , \ c_3 = 0.1885 \ , \ c_4 = 0.3272 \ , \ c_5 = 0.6729 \ , \ c_6 = −0.5906\end{array}$

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

References

Petrosky, G.E., and F. Farshad. "Pressure-Volume-Temperature Correlations for Gulf of Mexico Crude Oils." SPE Res Eval & Eng 1 (1998): 416–420. doi: https://doi.org/10.2118/51395-PA

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Petrosky-Farshad (1993) undersaturated oil isothermal compressibility @model

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