Bubblepoint Pressure -- Vasquez & Beggs

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Rsb
at Pb (scf/STB)
Gamma_g
air=1
Tr
deg F
Gamma_API
API
Pb
psia
V&B's correlation valid for 50 < pb < 5250 psia.
pb = (Rsb/(C1*Gamma_g*exp(C3*Gamma_API/(Tr+460))))**(1/C2)
Where
pb = bubble point pressure, psia [50,5250]
Rsb = solution GOR at pb, scf/STB, [20,2070]. For more info, refer to Vasquez & Beggs(Best), Lasater(Better), or Standing(Good).
Gamma_g = gas gravity (air=1.0), [0.56,1.18]
Tr = reservoir temperature, 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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