Undersaturated Oil Viscosity(μo,us)

Dynamic or absolute viscosity is defined as resistance to flow exerted by a fluid. It is a measure of the magnitude of internal friction between fluid layers as they move relative to each other.

The behavior of viscosity is similar to that of density. At pressures above the bubble point, the oil viscosity decreases with reduction in pressure due to reduced friction between fluid layers with the reduction in pressure.

Reference: PVT Property Correlations, Ahmed El-banbi, 2018


  • 1-Hanafy et al
  • 2-Beal
  • 3-Vasquez and Beggs
  • 4-Khan
  • 5-De Ghetto et al

Input Parameters

NameInput Value - UnitConverted ValueValidity CheckLink to Calculation Page
Oil Density Density of oil at pressure above bubble point pressure
More Details

g/cm³ - g/cc

Saturated Oil Density (ρo,s)


Bubble Point Pressure (Pb) Saturation pressure at reservoir temperature
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Bubble Point Pressure (Pb)
Saturated Oil Viscosity (μo,s)


Saturated Oil Viscosity(μo,s)
Dead Oil Viscosity (μo,d)


Dead Oil Viscosity(μo,d)
Stock Tank Oil Specific Gravity (ɣo) More Details

deg API

Saturated Oil Density (ρo,s)


CorrelationCalculated ValueWarningsRemarks
1-Hanafy et alcpDeveloped for Egyptian oils gathered from the Gulf of Suez, Western Desert, and Sinai regions.
2-BealcpGenerally applicable for all oil types
3-Vasquez and Beggscp
4-KhancpSaudi Arabian crude oils
5-De Ghetto et alcpMediterranean Basin, Africa, and the Persian Gulf