Difference between revisions of "Gas/Oil Interfacial Tension"

Latest revision as of 22:02, 29 December 2023

Gas/Oil Interfacial Tension

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

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}=\sigma_{68} + \frac{(T - 68) * (\sigma_{100} - \sigma_{68})}{ (100 - 68)}

At\ T>100F,\ \sigma_{od}=\sigma_{100}

\sigma_{o}=\sigma_{od} \times (1-0.024P^{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.

@@ Line 12: / Line 12: @@
 :<math> At\ T<68F,\  \sigma_{od}=\sigma_{68}</math>
-:<math> At\ 68F<T<100F,\  \sigma_{od}=\frac\sigma_{68} + {(T - 68) * (\sigma_{100} - \sigma_{68})}{ (100 - 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 (1-0.24P^{0.45})</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.

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