## Free Online PVT Calculator

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

# Gas Formation Volume Factor Calculator

Dranchuk-Abou-Kassem (1975)

N.B. The gas formation volume factor equation is used along with the Dranchuk-Abou-Kassem (DAK) (1975) correlation for the gas z compressibility factor.

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## Get more accurate PVT properties

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 Formation Volume Factor

In this section, I would like to make sure that you can easily describe the behavior of your gas formation volume factor at any reservoir pressure. Therefore, I will give you brief technical notes by answering three questions.
Why does the gas formation volume factor increases as pressure decreases?
The gas formation volume factor indicates how much the gas volume would change as a response to the change in pressure. As pressure decreases, the gas sharply expands due to its high compressibility. As a result, the gas formation volume factor increases as well. Actually, almost all the black oil properties respond differently to the decrease in reservoir pressure.
What are the PVT properties that affect the gas formation volume factor estimated value?
The gas formation volume factor is strongly dependent on the values estimated for the gas z compressibility (deviation) factor.
What are the PVT properties that depend on the gas formation volume factor estimated value?
The gas viscosity, the gas density, the gas isothermal compressibility, the total formation volume factor, and the gas-oil surface (interfacial) tension are all strongly dependent on the gas formation volume factor estimated value.

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