Oil FVF -- Vasquez & Beggs
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V&B's correlation.
Bo = 1 + C1*Rs + C2*(T-60)*(Gamma_API/Gamma_gc) + C3*Rs*(T-60)
*(Gamma_API/Gamma_gc)
Where
Bo = oil FVF at p and T, bbl/STB,
Rs = solution GOR, scf/STB, [20,2070].
For more info, refer to
Vasquez & Beggs(Best),
Lasater(Better), or
Standing(Good).
Gamma_gc = Corrected gas gravity (air=1.0).
For more info, refer to
Corrected Gas Gravity.
Tr = temperature of interest, F, [70,295] and
Gamma_API = stock-tank oil gravity, API [16,58].
C1, C2 and C3 are constants, depending on API.
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