Gas/Oil Interfacial Tension

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Gas/Oil Interfacial Tension

Gas/Oil Interfacial Tension correlation was published by Baker and Swerdloff in 1956.

File:Gas/Oil Interfacial Tension.png
Gas/Oil Interfacial Tension correlation in the PVT software at pengtools.com

Math and Physics

 \sigma_{68} =39 - 0.2571 SG_{oAPI}
 \sigma_{100} =37.5 - 0.2571 SG_{oAPI}
 At\ T<68F,\  \sigma_o=\sigma_{68}
 68F<T<100F,\  \sigma_o=\frac{\sigma_{68} + (T - 68) * (\sigma_{100} - \sigma_{68})}{ (100 - 68)}
<  T>100F,\ sigma_o=\sigma_{100}

The density of formation water (brine) at reservoir conditions:

 \rho_{wR}=\rho_{wSC}/B_w

Nomenclature

 B_w = water formation volume factor, res bbl/STB
 C_{mg/l} = water salinity or solids concentration, mg/l
 \rho_{wSC} = water density at standard conditions, lbm/ft3

References

Baker, O. and Swerdloff, W. 1955. Calculation of Surface Tension 3—Calculating parachor Values. Oil Gas J. (5 December 1955): 141. Baker, O. and Swerdloff, W. 1956. Calculation of Surface Tension 6—Finding Surface Tension of Hydrocarbon Liquids. Oil Gas J. (2 January 1956): 125.