Oil isothermal compressibility	c_o	psi^-1	p > p_b	$\begin{array}{l}c_o(p, T) = c_1 \, R_s^{c_2}(p, T) \, \gamma_g^{c_3} \, \gamma_{API}^{c_4} \, T^{c_5} \, p^{c_6}\end{array}$ $\begin{array}{l}c_1 = 1.705 \cdot 10^{-7}, \ c_2 = 0.69357, \ c_3 = 0.1885, \ c_4 = 0.3272, \ c_5 = 0.6729, \ c_6 = -0.5906\end{array}$

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

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