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 4: / Line 4: @@
 [[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]]
+[[File:Gas-Oil Interfacial Tension.png|thumb|right|400px|Gas/Oil Interfacial Tension correlation in the PVT software at pengtools.com]]
 ==Math and Physics==
@@ Line 11: / Line 11: @@
 :<math> \sigma_{100} =37.5 - 0.2571 SG_{oAPI}</math>
-:<math> At\ T<68F,\  \sigma_o=\sigma_{68}</math>
+:<math> At\ T<68F,\  \sigma_{od}=\sigma_{68}</math>
-:<math> At\ 68F<T<100F,\  \sigma_o=\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_o=\sigma_{100}</math>
+:<math>At\ T>100F,\ \sigma_{od}=\sigma_{100}</math>
-The density of formation water (brine) at reservoir conditions:
+:<math> \sigma_{o}=\sigma_{od} \times (1-0.024P^{0.45})</math>
-:<math> \rho_{wR}=\rho_{wSC}/B_w </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> 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> SG_{oAPI} </math> = oil specific gravity, °API
-:<math> \rho_{wSC} </math> = water density at standard conditions, lb<sub>m</sub>/ft<sup>3</sup>
+:<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.
+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.
@@ Line 32: / Line 39: @@
 |titlemode= replace
 |keywords=Water salinity, TDS, brine salinity, formation water salinity, Water formation volume factor
-|description=Gas/Oil Interfacial Tension
+|description=Gas/Oil Interfacial Tension correlation was published by Baker and Swerdloff in 1956.
 }}
 [[Category:PVT]]
 [[Category:pengtools]]

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