Bubblepoint Pressure -- Standing
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Standing's correlation valid for pb > 1000 psia.
pb = 18*(Rsb/Gamma_g)**0.83*10**y_g
pb = bubble point pressure, psia [130,7000]
y_g = mole fraction gas, =0.00091*Tr - 0.0125*Gamma_API,
Rsb = solution GOR at p>=pb, 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_API = stock-tank oil gravity, API [16.5,63.8].
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