Oil isothermal compressibility	c_o	psi^-1	p > p_b	$\begin{array}{l}\displaystyle c_o(p, T) = \frac{A}{p}\end{array}$ $\begin{array}{l}A = c_1 + c_2 \, R_{sb} +c_3 \, T + c_4 \, \gamma_g + c_4\, \gamma_{API}\end{array}$ $\begin{array}{l}c_1 = -1,433·10^{-5}, \ c_2 = 5·10^{-5}, \ c_3 = 17.2·10^{-5}, \ c_4 = -1,180·10^{-5}, \ c_5 = 12.61·10^{-5}\end{array}$

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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