Category: PVT

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PVT software

PVT software is the core PVT engine of the pengtools.

PVT software calculates the main properties of oil, gas and water using a set of black-oil correlations and provides the basic input for any Petroleum Engineering calculation.

PVT software is available online at and in AppStore for iPad.

Typical applications

  • Calculation of oil, gas and water properties
  • Generating the PVT model
  • Matching the PVT model to the Lab data
  • Exporting PVT tables to Excel or reservoir simulator

Main features

  • Plots of PVT properties vs pressure at reservoir temperature
  • Results table contains values under standard conditions and at pressures between surface atmospheric and reservoir at reservoir temperature
  • "Default values" button resets input values to the default values
  • Switch between Metric and Field units
  • Save/load models to the files and to the user’s cloud
  • Share models to the public cloud or by using model’s link
  • Export pdf report containing input parameters, calculated values and plots of the PVT properties
  • Continue your work from where you stopped: last saved model will be automatically opened
  • Download the chart as an image or data and print (upper-right corner chart’s button)
  • Export results table to Excel or other application


What to do when you need a PVT model quick? Watch our demo video on how to create a PVT model in 5 min?

Watch on youtube

In this demo we are solving the PVT exercise 11-2 of William McCain's book "The Properties of Petroleum Fluids".


Property Correlation Reference
Bubble point Valco - McCain Valkó, P.P. and McCain, W.D. Jr . 2003. Reservoir oil bubblepoint pressures revisited; solution gas–oil ratios and surface gas specific gravities. J. Pet. Sci. Eng. 37 (3–4): 153-169.
Gas-oil ratio Velarde Velarde, J., Blasingame, T.A., and McCain Jr., W.D. 1997. Correlation of Black Oil Properties At Pressures Below Bubble Point Pressure - A New Approach. Presented at the Annual Technical Meeting of CIM, Calgary, Alberta, 8–11 June. PETSOC-97-93.
Oil density McCain W.D. McCain, Jr, N.C. Hill: Correlations for Liquid Densities and Evolved Gas Specific Gravities for Black Oils during Pressure Depletion, SPE, 30773, 1995.
Oil FVF McCain W.D. McCain, Jr: The Properties of Petroleum Fluids, Second edition, Tulsa, Oklahoma, 1990.
Oil viscosity Beggs and Robinson Vazquez, M. and Beggs, H.D. 1980. Correlations for Fluid Physical Property Prediction. J Pet Technol 32 (6): 968-970. SPE-6719-PA.
Oil compressibility Farshad Frashad, F., LeBlanc, J.L., Garber, J.D. et al. 1996. Empirical PVT Correlations For Colombian Crude Oils. SPE-36105-MS.
Z factor Dranchuk Dranchuk, P.M. and Abou-Kassem, H. 1975. Calculation of Z Factors For Natural Gases Using Equations of State. J Can Pet Technol 14 (3): 34. PETSOC-75-03-03.
Gas density Standard equation
Gas FVF Standard equation
Gas viscosity Lee Lee, A.L., Gonzalez, M.H., and Eakin, B.E. 1966. The Viscosity of Natural Gases. J Pet Technol 18 (8): 997–1000. SPE-1340-PA.
Gas compressibility Standard equation
Water density McCain McCain Jr., W.D. 1991. Reservoir-Fluid Property Correlations-State of the Art. SPE Res Eng 6 (2): 266-272. SPE-18571-PA.