View source for 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|thumb|right|400px|Gas/Oil Interfacial Tension correlation in the PVT software at pengtools.com]]

==Math and Physics==

:<math> \sigma_{68} =39 - 0.2571 SG_{oAPI}</math>
:<math> \sigma_{100} =37.5 - 0.2571 SG_{oAPI}</math>

:<math> At\ T<68F,\  \sigma_{od}=\sigma_{68}</math>
:<math> At\ 68F<T<100F,\  \sigma_{od}=\sigma_{68} + \frac{(T - 68) * (\sigma_{100} - \sigma_{68})}{ (100 - 68)}</math>
:<math>At\ T>100F,\ \sigma_{od}=\sigma_{100}</math>

:<math> \sigma_{o}=\sigma_{od} \times (1-0.024P^{0.45})</math>

The interfacial tension becomes zero at miscibility pressure.  1 dyne/cm is used for calculations, then it becomes less than 1. 
:<math> if (\sigma_{o}<1) \sigma_{o}=1</math>

== Nomenclature  ==
:<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_{od} </math> = gas/oil interfacial tension for dead oil, dynes/cm
:<math> T </math> = temperature, °F

==See also==
[[Gas/Oil Interfacial Tension]]<br/>
[[Gas/Water Interfacial Tension]]

== References ==
Baker, O. and Swerdloff, W. 1955. Calculation of Surface Tension 3—Calculating parachor Values. Oil Gas J. (5 December 1955): 141.<br/>
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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|title=Gas/Oil Interfacial Tension
|titlemode= replace
|keywords=Water salinity, TDS, brine salinity, formation water salinity, Water formation volume factor
|description=Gas/Oil Interfacial Tension correlation was published by Baker and Swerdloff in 1956.
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[[Category:PVT]]
[[Category:pengtools]]