Stock Vapor Density formula |
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| \( W_v \;=\; \dfrac{ M_{mw} \cdot P_{va} }{ R \cdot \Delta T_v } \) | ||
| 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 | \(K\) | \(R\) |
Stock vapor density, abreviated as \(W_v\), is the density of the gas rich phase (vapor phase) that is in contact with the crude oil. It's a measurement used in the oil and gas industry to help determine the minimum miscibility pressure (MMP) for enhanced oil recovery processes, especially those involving \(CO_2\) or hydrocarbon gas injection.
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.
