Oil correlations based on North Sea oil samples.
bbl/stb |
\displaystyle B_o(p, T) = 1.0 + 10^A, \quad A = -6.58511 + 2.91329 \, \ln B^*_{ob} - 0.27683 \, \left( \ln B^*_{ob} \right)^2
B^*_{ob} = R_s \, \left( \frac{\gamma_g}{\gamma_o} \right)^{0.526} + 0.968 \, T | |
scf/stb |
\displaystyle R_s(p, T) = \gamma_g \cdot \big[ \gamma_{API}^{0.989} \, p^*_b \, T^{-0.172} \big]^{1.2255}, \quad p^*_b = 10^X, \quad X = 2.8869 - (14.1811 - 3.3093 \, \ln p)^{0.5} | |
Bubble point pressure, pb | psia | \displaystyle \lg(p_b) = 1.7669 + 1.7447 \, \lg(p^*_b) - 0.30218 \, [\lg(p^*_b) ]^2, \displaystyle p^*_b = \left( R_s/\gamma_g \right)^a \, T^b \, \gamma_{API}^c a = 0.816 \ , \ c = -0.989 b = \begin{cases} 0.172, & \mbox{for Black Oil} \\ 0.130, & \mbox{for Volatile Oil} \end{cases} |
where
Location | North Sea | |
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