Difference between revisions of "Gas/Oil Interfacial Tension"

Revision as of 07:55, 5 October 2020

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}=\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})

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

Nomenclature

P

= pressure, psia

\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 15: / Line 15: @@
 :<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 (1-0.24P^{0.45})</math>
 :<math> if (\sigma_{o}<1) \sigma_{o}=1</math>
-The density of formation water (brine) at reservoir conditions:
-:<math> \rho_{wR}=\rho_{wSC}/B_w </math>
 == Nomenclature  ==
-:<math> B_w </math> = water formation volume factor, res bbl/STB
+:<math> P </math> = pressure, psia
-:<math> C_{mg/l} </math> = water salinity or solids concentration, mg/l
+:<math> \sigma_{o} </math> = gas/oil interfacial tension, dynes/cm
-:<math> \rho_{wSC} </math> = water density at standard conditions, lb<sub>m</sub>/ft<sup>3</sup>
+:<math> \sigma_{od} </math> = gas/oil interfacial tension for dead oil, dynes/cm
+:<math> T </math> = temperature, °F
 == References ==

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