Recalculation of the total gas relative weight $\begin{array}{l}\gamma_g\end{array}$ to the reference separator conditions: $\begin{array}{l}p_{sep}^* = 100\end{array}$ psig, $\begin{array}{l}T_{sep}^* = 60\end{array}$ °F:

Reference separator gas gravity	γ_gs	frac	$\begin{array}{l}\displaystyle \gamma_{gs} = \gamma_g \, \left [ 1+ 5.912 \cdot 10^{-5} \, \gamma_{API} \, T \, \ln ( p_{sep} /114.7) \right]\end{array}$

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
$\begin{array}{l}p_{sep}\end{array}$	psig	Separator pressure
$\begin{array}{l}T_{sep}\end{array}$	°F	Separator temperature

Selection of 100 psig ( = 6.89476 barg = 790.801 kPa of absolute pressure) for reference separator conditions was made in favour of cases when separator pressure is not known and 100 psig will be closer to practical cases than other assumptions.

References

Vasquez, M., and H.D. Beggs. "Correlations for Fluid Physical Property Prediction." J Pet Technol 32 (1980): 968–970, doi.org/10.2118/6719-PA

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Vasquez-Beggs (1980) reference separator gas gravity ygs @model

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