Equation of State Fluid Characterization

Program Objectives


This course focuses on phase behaviour and equation of state characterization for complex petroleum fluids. Both industry standard equation of state methods of Peng-Robinson and Soave-Redlich-Kwong are discussed in great detail. In addition, a fundamental understanding of acentric and volume shift parameters, binary interaction coefficients is imparted. Different EOS calculations including flash, saturation pressure, phase stability, and compositional grading are presented. Special cases for three phase systems, and wax depositions are also discussed. The course teaches with an example of how to characterize the hydrocarbon heavy end characterization and initialization of an EOS model. The art of EOS tuning is discussed with several examples. The students will also have hands on experience in tuning an EOS model to match experimental data using EOS modeling software.
Course Outline
Day 1
  • EOS Fundamentals
    • The Ideal Gas and The Real Gas Laws 
    • Critical Properties 
    • Van der Waals Law 
    • Peng-Robinson and Soave‑Redlich‑Kwong EOS models 
Day 2
  • Basic Parameters
    • The acentric and volumetric shift parameters
    • Treatments for mixtures 
    • Mixing rules 
    • The Binary Interaction Parameters 
    • The Law of Corresponding States 
    • Thermodynamic Equilibrium 
    • K-value correlations 
Day 3
  • Ternary diagrams and Asphaltene Models 
    • Ternary diagram 
    • The Rice-Rachford Equation 
    • Minimisation of Gibbs Free Energy 
    • Phase Stability 
    • The Two‑Phase Flash Calculation 
    • The Saturation Pressure Calculation 
    • Compositional Grading 
    • Special considerations for three-phase systems 
    • Asphaltene models


Day 4
  • EOS Characterisation Development
    • How to read and QC a PVT report
    • What data is useful and what data is not 
    • What EOS model to use 
    • How many components to use 
    • What to do with the heavy ends 
    • How to make an initial characterization 
    • What EOS parameters to regress upon and why 
    • Quality-checking the characterization 
Day 5
  • Special Considerations and Class Examples 
    • Special considerations for volatile systems 
    • Special considerations for miscible systems 
    • Final Exam