Undersaturated oil formation volume factor | Bo(p) | bbl/stb | \displaystyle B_o(p) = 1 + a_1 \, R_s(p) + (T-60) \, \left( \frac{\gamma_{API}}{\gamma_g} \right) \, \big[ a_2 +a_3 \, R_s(p) \big] |
---|
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 |
and
\gamma_{API} \leq 30 \ {\rm API} | \gamma_{API} > 30 \ {\rm API} | |
---|---|---|
a_1 | 4.677 · 10-4 | 4.670· 10-4 |
a_2 | 1.751· 10-5 | 1.100· 10-5 |
a_3 | -1.811· 10-8 | 1.337· 10-9 |
See Also
Petroleum Industry / Upstream / Petroleum Engineering / Subsurface E&P Disciplines / Reservoir Engineering (RE) / PVT correlations / Oil correlations
[ Vasquez-Beggs (1980) oil correlations ]