Oil isothermal compressibility	c_o	psi^-1	p > p_b	$\begin{array}{l}\displaystyle c_o(p, T) = \frac{-1,433 + 5 R_{sb} + 17.2 \, T-1,180 \, \gamma_g + 12.61 \, \gamma_{API}}{p \cdot 10^5}\end{array}$

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

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