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Oil isothermal compressibility
,
co
(p)bbl/stb
psi-1p > pb

LaTeX Math Inline
body--uriencoded--\displaystyle c_o(p, T) = \

frac%7BX%7D%7Bp \cdot 10%5e5%7D, \quad X = с

frac%7BA%7D%7Bp%7D

LaTeX Math Inline
body--uriencoded--A = c_1 +

с

c_2 \, R_%7Bsb%7D +c_3 \, T + c_4 \, \gamma_g + c_

5

4\, \gamma_%7BAPI%7D

LaTeX Math Inline
body--uriencoded--c_1 =

−1,433 \

-1,433·10%5e%7B-5%7D, \ c_2 =

5 \

5·10%5e%7B-5%7D, \ c_3 = 17.

2 \

2·10%5e%7B-5%7D, \ c_4 = -1,

180 \

180·10%5e%7B-5%7D, \ c_5 = 12.

61

61·10%5e%7B-5%7D

where

LaTeX Math Inline
bodyp

psiaFluid pressure

LaTeX Math Inline
bodyT

°FInitial formation temperature

LaTeX Math Inline
body--uriencoded--\gamma_%7BAPI%7D

APIOil API gravity

LaTeX Math Inline
body\gamma_o

fracOil specific gravity

LaTeX Math Inline
body\gamma_g

fracGas specific gravity

LaTeX Math Inline
body--uriencoded--R_%7Bsb%7D

scf/stbGas Solubility at Bubble point pressure

...

Petroleum Industry / Upstream / Petroleum Engineering / Subsurface E&P Disciplines / Reservoir Engineering (RE) / PVT correlations / Oil correlations

[ Vasquez-Beggs (1980) oil correlations ]

References

...

Vasquez, M., and H.D. Beggs. "Correlations for Fluid Physical Property Prediction." J Pet Technol 32  J Pet Technol 32 (1980): 968–970. doi: https://, doi.org/10.2118/6719-PA