Difference between revisions of "Gas/Oil Interfacial Tension"

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== Nomenclature  ==
 
== Nomenclature  ==
 
:<math> P </math> = pressure, psia
 
:<math> P </math> = pressure, psia
 +
:<math> SG_{oAPI} </math> = oil specific gravity, °API
 
:<math> \sigma_{o} </math> = gas/oil interfacial tension, dynes/cm
 
:<math> \sigma_{o} </math> = gas/oil interfacial tension, dynes/cm
 
:<math> \sigma_{od} </math> = gas/oil interfacial tension for dead oil, dynes/cm
 
:<math> \sigma_{od} </math> = gas/oil interfacial tension for dead oil, dynes/cm

Revision as of 08:05, 5 October 2020

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_{od}=\sigma_{68}
At\ 68F<T<100F,\ \sigma_{od}=\frac{\sigma_{68} + (T - 68) * (\sigma_{100} - \sigma_{68})}{ (100 - 68)}
At\ T>100F,\ \sigma_{od}=\sigma_{100}
\sigma_{o}=\sigma_{od} \times (1-0.24P^{0.45})

The interfacial tension becomes zero at miscibility pressure. 1 dyne/cm is used for calculations, then it becomes less than 1.

if (\sigma_{o}<1) \sigma_{o}=1

Nomenclature

P = pressure, psia
SG_{oAPI} = oil specific gravity, °API
\sigma_{o} = gas/oil interfacial tension, dynes/cm
\sigma_{od} = gas/oil interfacial tension for dead oil, dynes/cm
T = temperature, °F

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.

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