## Free Online PVT Calculator

Calculate the properties of petroleum reservoir fluids with a reliable, simple PVT calculator. Use the Bergman-Sutton oil viscosity calculator.

# Oil Viscosity Calculator

Bergman-Sutton (2006-2009)

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

N.B. The Bergman-Sutton (2006-2009) correlations for the dead-oil-viscosity, the saturated oil viscosity, and the under-saturated oil viscosity are used along with the Standing (1947) correlations for the oil bubble point pressure and the solution gas-oil ratio.

Want more details? Discover Bergman-Sutton correlations.

## Fluid Property Behavior

### Oil Viscosity

In this section, I would like to make sure that you can easily describe the behavior of your reservoir oil viscosity at any pressure. Therefore, I will give you brief technical notes by answering three questions.
Why the oil viscosity is minimum at the bubble point pressure?
At pressures above the bubble point pressure, the oil phase is saturated with the maximum amount of soluble gas. As a result, the oil-phase responds to the decrease in pressure and becomes relatively less viscous. On the other hand, when the pressure decreases below the bubble point pressure, more gas is liberating from the liquid phase, making the oil much more viscous. 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 viscosity?
The oil viscosity is strongly dependent on the values estimated for both the bubble point pressure and the solution gas-oil ratio.
What are the black oil PVT properties that depend on the value estimated for the oil viscosity?
Actually, there is no black oil property that depends on the value estimated for the oil viscosity.

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