Oil FVF -- Standing
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Standing's correlation for saturated systems.
Bo = 0.972 + 0.000147*F**1.175
F = Rs*(Gamma_g/Gamma_o)**0.5 + 1.25*T
Bo = Oil formation volume factor, bbl/STB,
Rs = solution GOR, scf/STB, [20,1425].
For more info, refer to
Vasquez & Beggs(Best),
Gamma_g = gas gravity (air=1.0), [0.59,0.95]
Tr = reservoir temperature, F, [100,258] and
Gamma_o = oil specific gravity,
Gamma_API = stock-tank oil gravity, API [16.5,63.8].
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