Free Online PVT Calculator

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. The Asheim (1989) correlation for the gas-oil surface tension calculator is used 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 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 the gas-oil surface tension increases as pressure decreases?
When the pressure decreases, the density of both the gas and liquid decreases. However, the gas becomes much more lighter than the oil, making the difference in density between the two phases increases. As a result, the gas-oil interfacial tension increases as a response to the decrease in reservoir pressure. Actually, almost all the black oil properties respond differently to the decrease in reservoir pressure.
What are the PVT properties that 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 are the PVT properties that depend on the value estimated for the gas-oil surface tension?
Actually, there is no black oil property that depends on the value estimated for the gas-oil surface, or interfacial, tension.

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Gas Z Compressibility Factor
Gas Formation Volume Factor
Gas-Oil Surface Tension

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