Stock Vapor Density

Stock Vapor Density formula
\( W_v \;=\;  \dfrac{ M_{mw} \cdot P_{va}  }{ R \cdot \Delta T_v } \)
Symbol	English	Metric
\( W_v \) = Stock Vapor Density	\(lbm \;/\; ft^3\)	\(kg \;/\; m^3\)
\( M_{mw} \) = Vapor Molecular Weight	\(lbm \;/\; lbmol\)	\(kg \;/\; kmol\)
\( P_{va}  \) = Vapor Pressure at Average Daily Liquid Surface Temperature	\(K\)	\(R\)
\( R \) = Ideal Gas Constant	\(lbf-ft\;/\;lbmol-R\)	\(J / kmol - K\)
\( \Delta T_v \) = Average Daily Vapor Temperature	\(K\)	\(R\)

Essentially, it measures how effectively the injected gas can extract intermediate components from the crude oil.  As pressure increases, the density of the injected gas-rich phase also increases, which enhances its ability to mix with and recover more oil.  This vapor density method provides a direct way to assess the solvency properties of the injected gas and is a quicker alternative to traditional slim-tube experiments for determining MMP.