Isothermal Compressibility -- Vasquez & Beggs

In this spreadsheet, just type in the required information and press the compute button. Scroll down for more info.

Rsb
scf/STB
Gamma_g
air=1
Tr
deg F
Gamma_API
API
P
psia
Co
1/psia
V&B's correlation.
Co = (5*Rsb + 17.2*Tr - 1180*Gamma_g + 12.61*Gamma_API - 1433) /(p*10**5)
Where
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), Lasater(Better), or Standing(Good).
Gamma_g = gas gravity (air=1.0),
Tr = temperature of interest, F, and
Gamma_API = stock-tank oil gravity, API

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