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Calculate the properties of petroleum reservoir fluids with a reliable, simple PVT calculator. Use the Asheim gas-oil surface tension calculator.

Gas-Oil Surface Tension

Asheim (1989)

First-stage separator gas specific gravity
Stock-tank oil specific gravity
Solution gas-oil ratio at bubble point pressure

N.B. This gas-oil surface tension calculator applies the Asheim (1989) correlation along with the Dranchuk-Abou-Kassem (DAK) (1975) correlation for the gas formation volume factor and the Standing (1947) correlation for the oil formation volume factor.

Want more details? Discover the Asheim (1989) correlation.

Fluid Property Behavior

Gas-Oil Surface Tension

In this section, I would like to make sure that you can easily describe the behavior of your gas-oil surface, or interfacial, tension at any reservoir pressure. Therefore, I will give you brief technical notes by answering three questions.

The behavior of gas-oil surface tension at any reservoir pressure
Behavior of the gas-oil IFT versus pressure
Why does the gas-oil surface tension increases as pressure decreases?
When the pressure decreases, both the gas and liquid density decreases. However, the gas becomes much lighter than the oil, making the difference in density between the two phases increase. As a result, the gas-oil interfacial tension increases due to the decrease in reservoir pressure. Almost all the black oil properties respond differently to the reduction in reservoir pressure.
What PVT properties affect the value estimated for the gas-oil surface tension?
The gas-oil surface, or interfacial, tension is strongly dependent on the values estimated for the solution gas-oil ratio, the oil formation volume factor, and the gas formation volume factor.
What PVT properties depend on the value estimated for the gas-oil surface tension?
No black oil property depends on the value estimated for the gas-oil surface or interfacial tension.

Calculate more PVT properties

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Gas Z Compressibility Factor
Gas Formation Volume Factor

Oil Bubble Point Pressure

Solution Gas-Oil Ratio
Oil Formation Volume Factor
Oil Viscosity
Oil Density
Oil Compressibility
Total Formation Volume Factor
Gas-Oil Surface Tension

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Gas Z Compressibilty Factor
Oil Bubble Point Pressure
Solution Gas-Oil Ratio
Oil Formation Volume Factor
Oil Viscosity
Gas-Oil Surface Tension

Fluid Correlation

Dranchuk-Abou-Kassem (1975)
Standing (1947)
Vazquez-Beggs (1980)
Glaso (1980)
Bergman-Sutton (2006-2009)
Asheim (1989)

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