Miscible Enhanced Oil Recovery

Program Objectives

This 5-day course introduces the students to compositionally enhanced recovery processes by industry experts. The course begins with a brief introduction to the objectives of the short course followed by miscible displacement mechanisms in one dimension. The laboratory phenomenon of miscible displacement and compositionally enhanced displacement is illustrated citing the results of many experiments conducted in world-class laboratories of major oil companies. This is followed by explanation of the displacement behavior in reservoir scale simulator models for enriched hydrocarbon gas, lean hydrocarbon gas, carbon dioxide and Nitrogen. The concepts of phase behavior are explained using ternary diagrams and the subtle differences between vaporizing, condensing, and vaporizing-condensing mechanisms are explained. The prediction of phase behavior using equation-of-state (EOS) is explained with a procedure to tune EOS with experimental data. Miscibility guidelines and correlations are presented. Displacement mechanisms are explained by illustrating the differences between viscous fingering, permeability channeling, and gravity override. The importance of reservoir description in any EOR process is shown and several field examples and case histories are presented to make the student fully aware of the screening and benefits of miscible gas flooding and evaluate each project on its own merits.
Course Outline
Day 1
  • Overview of Gas Compositional Processes 
  • Class Problem 1: Incremental oil recovery 
  • Gas sources and gas properties 
  • Phase behavior concepts 
  • Class Problem 2: Identify gas processes on ternary diagram 
  • Phase behavior prediction using an equation of state (EOS) 
  • Class Problem 3: C7+ characterization 
  • Necessary data for EOS tuning 
Day 2
  • Equation of State (EOS) 
  • Class Problem 4: Hands-on experience with EOS 
  • Displacement mechanisms 
  • Class Problem 5: Viscous-gravity ratio 
  • Class Problem 6: Gas requirement 
  • Compositional simulation 
Day 3
  • Compositional simulation (continued) 
  • Class Problem 7: Illustration of grid refinement and effect of reservoir description 
  • Scale-up of simulations to predict full-field behaviour 
  • Streamline scale-up tool demo 
  • Class Problem 8

Day 4
  • Reservoir characterization effects on gas sweep and oil recovery
  • Field case histories 
  • Pilot design and testing considerations 
  • Reservoir candidate screening 
  • Class Problem 9: Screening for projects 
Day 5
  • Class Project – Screening studies 
  • Exam 
  • Final Exam