# Free Online PVT Calculator

Calculate the properties of petroleum reservoir fluids with a reliable, simple PVT calculator. Use the Vazquez-Beggs oil bubble point pressure calculator.

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Calculate the properties of petroleum reservoir fluids with a reliable, simple PVT calculator. Use the Vazquez-Beggs oil bubble point pressure calculator.

Vazquez-Beggs (1980)

First-stage separator gas specific gravity

Stock-tank oil specific gravity

Solution gas-oil ratio at bubble point pressure

**N.B.** The Vazquez-Beggs (1980) correlation is used to calculate the oil bubble point pressure.

Want more details? Discover Vazquez-Beggs (1980) correlations.

In this section, I would like to make sure that you can easily describe the behavior of your oil bubble point pressure. Therefore, I will give you brief technical notes by answering three questions.

Why the oil bubble point pressure is the first PVT property that you need to estimate for your reservoir fluids?

It’s good to know that almost any black oil PVT property tends to behave at pressures less than bubble point pressure, entirely different from the way it behaves at pressures greater than bubble point pressure. And that’s why you need to calculate the oil bubble point pressure at first. Moreover, almost all the black oil properties respond differently to the decrease in reservoir pressure.

What are the PVT properties that are affecting the value estimated for the oil bubble point pressure?

Actually, the oil bubble point pressure is completely independent of any other black oil PVT properties.

What are the PVT properties that depend on the value estimated for the oil bubble point pressure?

The solution gas-oil ratio is strongly dependent on the value estimated for the oil bubble point pressure.

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