(1)	$\begin{array}{l}\displaystyle R_v = \exp \big [ 3.684 + 0.61967 \cdot Z + 0.015359 \cdot Z^2 \big ]\end{array}$

(2)	$\begin{array}{l}\displaystyle Z = \sum_{n=0}^4 \, Z_n\end{array}$

(3)	$\begin{array}{l}\displaystyle Z_n = C_{n0} + C_{n1} \cdot {\rm VAR}_n + C_{n2} \cdot {\rm VAR}_n^2 + C_{n3} \cdot {\rm VAR}_n^3 + C_{n4} \cdot {\rm VAR}_n^4\end{array}$

where

$\begin{array}{l}R_v\end{array}$

stb/MMscf

Vaporized Oil Ratio

and

n	VAR_n			C_n0	C_n1	C_n2	C_n3	C_n4
1	$\begin{array}{l}\ln p\end{array}$	Fluid pressure	psia	20.809	-6.7095	0.5136	0	0
2	$\begin{array}{l}\gamma_{o{\rm API}}\end{array}$	Initial stock-tank condensate API gravity	°API	11.175	-1.2965	0.042311	-0.0005438	2.49E-6
3	$\begin{array}{l}\gamma_{g Rd}\end{array}$	Gas specific gravity recombined to the dew point	frac	-13.365	27.652	-18.598	4.3658	0
4	$\begin{array}{l}T_r\end{array}$	Fluid temperature	°F	-1.5309	0.0058453	1.4E-6	0	0

The correlation is built over the following range:

			Minimum	Maximum
Initial stock-tank condensate API gravity	$\begin{array}{l}\gamma_{o{\rm API}}\end{array}$	°API	37.8	76.5
Gas specific gravity recombined to the dew point	$\begin{array}{l}\gamma_{g Rd}\end{array}$	frac	0.643	1.568
Fluid temperature	$\begin{array}{l}\mathrm{T}\end{array}$	°F	126	348
Fluid pressure	$\begin{array}{l}\mathrm{p}\end{array}$	psia	1,115	9,015

The correlation has been built for the $\begin{array}{l}R_v\end{array}$ measured at the first stage of separator (as the oil yield measurements at second stage separator and stock tank are not readily available).

This means that further corrections may be required to get accurate values of $\begin{array}{l}R_v\end{array}$ in respect to STP.

References

Ovalle, Adriana P., Lenn, Christopher Peter, and William D. McCain. "Tools To Manage Gas/Condensate Reservoirs; Novel Fluid-Property Correlations on the Basis of Commonly Available Field Data." SPE Res Eval & Eng 10 (2007): 687–694. doi.org/10.2118/112977-PA

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Ovalle Dew Point Pressure Correlation @model

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