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A Contribution to Predicting the Properties of Petroleum Fluids

Petroleum fluids (crude oil, gas condensate, and their derivatives) are highly complex natural mixtures in the sense that they contain too many components to be identified and analyzed. This is why they are difficult to represent thermodynamically. Nevertheless, such mixtures can be characterized after splitting them into fractions and after determining the properties of each fraction (e.g., molecular weight, boiling point, density, viscosity, etc.). Based on our previous research [1, 2], here we present a simplified model for characterizing heavy petroleum fractions and for predicting vapor–liquid equilibria. The required input data include complete TBP analysis, PNA analysis, and density data, preferably for each sub-fraction. Known thermodynamic procedures [1] are used to estimate the critical data, acentric factor, and molecular weight for the model compounds. The calculated thermodynamic properties are in a very good agreement with the corresponding experimental values for light to medium crude oil fractions. Additional experimental data are needed to obtain more reliable results for fractions with a TBP above 600 K. 1. G. Bogdanić, J. Pavlíček J., Wichterle I.: Theoretical Background for Predicting the Properties of Petroleum Fluids via Group Contribution Methods, Procedia Eng. 42(SI), 1873-1878 (2012). 2. G. Bogdanić: Invited lecture - A Contribution to Predicting the Properties of Petroleum Fluids, World Congress on Petrochemistry and Chemical Engineering, San Antonio, USA, 18-20 November 2013. (http://www.omicsgroup.com/conferences/petrochemistry-chemical-engineering-2013/scientific-programme.php?day=2&sid=132&date=2013-11-19)

Properties of Petroleum Fluids; Prediction

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