Saturated oil formation volume factor | Bo | bbl/stb | p ≤ pb | \displaystyle B_o(p, T) = 1 + c_1 \, R_s(p, T) + (T-60) \, \left( \frac{\gamma_{API}}{\gamma_g} \right) \, \big[ c_2 +c_3 \, R_s(p, T) \big] \gamma_{API} \leq 30 \ {\rm API} : \quad c_1 = 4.677 · 10^{-4}, \, c_2 = 1.751· 10^{-5}, \ c_3 = -1.811· 10^{-8} \gamma_{API} > 30 \ {\rm API} : \quad c_1 = 4.670 · 10^{-4}, \, c_2 = 1.100 · 10^{-5}, \ c_3 = 1.337 · 10^{-8} |
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where
p | psia | Fluid pressure |
T | °F | Initial formation temperature |
\gamma_{API} | °API | Oil API gravity |
\gamma_o | frac | Oil specific gravity |
\gamma_g | frac | Gas specific gravity |
See Also
Petroleum Industry / Upstream / Petroleum Engineering / Subsurface E&P Disciplines / Reservoir Engineering (RE) / PVT correlations / Oil correlations
[ Vasquez-Beggs (1980) oil correlations ]