## Free Online PVT Calculator

Calculate the properties of petroleum reservoir fluids with a reliable, simple PVT calculator. Use the Glaso oil compressibility calculator.

# Oil Compressibility

Glaso (1980)

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

N.B. At pressures less than bubble point pressure, the Glaso (1980) correlations for the solution gas-oil ratio and the saturated oil formation volume factor are used to calculate the saturated oil compressibility. At pressures greater than bubble point pressure, the Vazquez-Beggs (1980) correlation for the under-saturated oil compressibility is used.

Want more details? Discover Glaso (1980) correlations.

## Fluid Property Behavior

### Oil Compressibility

In this section, I would like to make sure that you can easily describe the behavior of the oil isothermal compressibility at any reservoir pressure. Therefore, I will give you brief technical notes by answering three questions.
Why the oil compressibility is changing rapidly at the bubble point pressure?
When the pressure decreases above the bubble point pressure, the solution gas-oil ratio remains constant. As a result, the single-phase oil starts expanding, becoming relatively less compressible. However, when the pressure reaches the bubble point pressure, the gas starts liberating from the liquid phase, making the whole system much more compressible abruptly. Actually, almost all the black oil properties respond differently to the decrease in reservoir pressure.
What are the black oil PVT properties that are affecting the value estimated for the oil compressibility?
The oil compressibility is strongly dependent on the values estimated for the bubble point pressure, the solution gas-oil ratio, and the saturated oil formation volume factor.
What are the black oil PVT properties that depend on the value estimated for the oil compressibility?
Both the oil density and the under-saturated oil formation volume factor are strongly dependent on the value estimated for the oil compressibility.

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