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Free Online PVT Calculator

Calculate the properties of petroleum reservoir fluids with a reliable, simple PVT calculator. Use the Dranchuk-Abou-Kassem gas z compressibility factor calculator.

Gas Z Factor Calculator

Dranchuk-Abou-Kassem (1975)

N.B. The Dranchuk-Abou-Kassem (DAK) (1975) correlation for the gas z compressibility (deviation) factor is used along with the Sutton (2007) correlation for the gas pseudo-critical properties and the Wichert-Aziz (1972) correlation for the non-hydrocarbons correction.

Want more details? Discover Dranchuk-Abou-Kassem (1975) correlation.

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10% error in the reservoir PVT properties leads to a 10% error in your estimated reserves. And that's why you need a reliable fluid property calculator.

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Fluid Property Behavior

Gas Z Compressibility Factor

In this section, I would like to make sure that you can easily describe the behavior of your gas z compressibility (deviation) factor at any pressure. Therefore, I will give you brief technical notes by answering three questions.
The behavior of gas Z compressibility factor at any reservoir pressure
Behavior of the gas z factor vs. pressure
Why the gas z-factor increases as pressure increases?
At standard conditions, the gas behaves as an ideal gas. And that’s why the gas compressibility z factor equals one. As pressure increases, the gas tends to deviate from the ideal behavior. As a result, the gas z-factor increases as pressure increases. Actually, almost all the black oil properties respond differently to the decrease in reservoir pressure.
What are the PVT properties that affect the gas z factor estimated value?
The gas z-factor is strongly dependent on the values estimated for both gas pseudo-critical temperature and gas pseudo-critical pressure.
What are the PVT properties that depend on the gas z-factor estimated value?
The gas formation volume factor, the gas viscosity, the gas density, and the gas isothermal compressibility are all strongly dependent on the value estimated for the gas z-factor.

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