Difference between revisions of "Gas/Oil Interfacial Tension"

From wiki.pengtools.com
Jump to: navigation, search
(Math and Physics)
 
(12 intermediate revisions by the same user not shown)
Line 4: Line 4:
 
[[Gas/Oil Interfacial Tension]] correlation was published by '''Baker and Swerdloff''' in '''1956'''.
 
[[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==
 
==Math and Physics==
Line 11: Line 11:
 
:<math> \sigma_{100} =37.5 - 0.2571 SG_{oAPI}</math>
 
:<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  ==
 
== 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 ==
 
== 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.
 
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
 
|titlemode= replace
 
|keywords=Water salinity, TDS, brine salinity, formation water salinity, Water formation volume factor
 
|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:PVT]]
 
[[Category:pengtools]]
 
[[Category:pengtools]]

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

See also

Gas/Oil Interfacial Tension
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. 1956. Calculation of Surface Tension 6—Finding Surface Tension of Hydrocarbon Liquids. Oil Gas J. (2 January 1956): 125.