(1)	$\begin{array}{l}\displaystyle P_d = 8.48 + 0.32239 \cdot Z + 0.000477 \cdot Z^2\end{array}$

(2)	$\begin{array}{l}\displaystyle Z = \sum_{n=1}^3 \, Z_n\end{array}$

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

where

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

psia

Dew point pressure

and

n	VAR_n			C_n0	C_n1	C_n2
1	$\begin{array}{l}\ln R_{vd}\end{array}$	Vaporized Oil Ratio at Dew point pressure	stb/MMscf	9.8895	-0.87528	-0.01691
2	$\begin{array}{l}\gamma_{o{\rm API}}\end{array}$	Initial stock-tank condensate API gravity	°API	11.7	-0.29709	0.00151
3	$\begin{array}{l}\gamma_{g Rd}\end{array}$	Gas specific gravity recombined to the dew point	frac	3.5202	-2.9145	-0.81744

The correlation is built over the following range:

			Minimum	Median	Maximum
Vaporized Oil Ratio for recombined dewpoint gas composition	$\begin{array}{l}R_{vd}\end{array}$	stb/MMscf	8.82	47.05	436.8
Initial stock-tank condensate API gravity for recombined dewpoint gas composition	$\begin{array}{l}\gamma_{o{\rm API}}\end{array}$	°API	35.6	55.1	76.5
Gas specific gravity for recombined dewpoint gas composition	$\begin{array}{l}\gamma_{g Rd}\end{array}$	frac	0.609	0.95	1.623
Fluid temperature	$\begin{array}{l}\mathrm{T}\end{array}$	°F	93	266.7	348
Dew point pressure	$\begin{array}{l}\mathrm{p_d}\end{array}$	psia	1,870	5,093	10,980

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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