Advanced Reservoir Engineering

Program Objectives

This course is the second in a two-part series of reservoir engineering courses.  This first course in this series is Basic Reservoir Engineering. This 5-day course examines primary recovery and the pressure-depletion performance of hydrocarbon reservoirs.  The course covers the full range of hydrocarbon fluids, from wet and dry gases to black oils, including gas condensates and volatile oils.  The course also covers the full range of producing mechanisms, including solution-gas drives, water drives, gas-cap drives, and compaction drives.  The depletion performance of each fluid type and each producing mechanism is discussed and compared.  Example rate, cumulative-recovery, and pressure histories are presented.  Performance is systematically and phenomenologically explained.  Critical performance indicators are identified and their characteristic production behavior noted.  Methods to analyze production, natural water influx, key analytical water-influx models, and important analytical methods to analyze water-drive reservoirs and to estimate water-influx parameters are also discussed.  This course includes a brief introduction to numerical reservoir simulation.  The course includes a special project where participants build their own modified black-oil tank simulator using Microsoft Excel and then use it to predict the performance of a hypothetical reservoir.  Participants experience the importance of numerical reservoir simulation to modern reservoir engineering and see some of the internal elements of a simulator.  This project makes this course an excellent precursor to a formal course on numerical reservoir simulation.
Course Outline
Day 1
  • Reservoir producing mechanisms
  • Reservoir energies 
  • Fluid properties
    • Fluid classes
      • Dry gases
      • Wet gases
      • Gas condensates
      • Volatile oils
      • Black oils
    • Fluid characteristics
    • Producing characteristics
    • p-T diagrams
    • Standard PVT parameters (Bo, Rs, Bg, and Rv) 
Day 2
  • Material balance
    • Assumptions
    • Physical interpretation
    • Equations
  • Expansion mechanisms
    • Gas expansion and expansivities
    • Oil expansion and expansivities
    • Water expansion and pore-volume contraction
  • Fluid withdrawal
    • Water-influx models
    • van Everdingen-Hurst model
    • Estimating water-influx parameters
Day 3 
  • Water Influx
    • Water drive classification
    • Aquifer classification
    • Water-drive diagnosis
    • Key aquifer properties 

Day 4
  • Black-oil reservoirs
    • Material balance and recovery strategies
    • Importance of compaction in oil reservoirs
    • Estimating oil well rates 
    • Solution-gas-drive reservoir performance 
    • Gas-cap-drive reservoir performance
    • Water-drive reservoir performance
    • Analyzing performance using material balance 
Day 5
  • Volatile-oil and gas-condensate reservoirs
    • Estimating well rates
    • Volatile-oil reservoir reservoir performance
    • Gas-condensate reservoir performance
    • Gas cycling
    • Dewpoint cycling
    • Analyzing performance using material balance