Isothermal Compressibility -- Vasquez & Beggs
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Co = (5*Rsb + 17.2*Tr - 1180*Gamma_g + 12.61*Gamma_API - 1433)
Co = Oil Isothermal Compressibility, 1/psia
p = pressure of interest, psia
Rsb = solution GOR at pb, scf/STB.
For more info, refer to
Vasquez & Beggs(Best),
Gamma_g = gas gravity (air=1.0),
Tr = temperature of interest, F, and
Gamma_API = stock-tank oil gravity, API
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