training specialists to the upstream oil and gas industry

Gas Reservoir Engineering

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Course overview

Each subject is developed along the following outline.  Fundamentals to develop an understanding of the principles, pertinent equations are highlighted and an example problem worked to illustrate the application to reservoir analysis.
Lastly class problems are available for each participant to practice the solution and analysis process.

The course is designed for

Reservoir engineers and professionals who work in collaboration with reservoir engineers, including well engineers, facilities engineers, process engineers, petrophysicists and geoscientists.

Course outline

Gas well testing

  • Methods for calculating the absolute open flow potential are developed.
  • Meaning of the wellbore coefficient (C) and exponent (n) are discussed.
  • A method for replacing static pressures required when applying the material balance equation with short term buildup pressures.
  • Apply the quadratic equation model to calculate original gas in place when only producing rate and flowing tubing head pressures (FTHP) are available.

Forecasting performance

  • Apply the pseudosteady state flow equation
  • Apply the absolute open flow equation

Fluid analysis 

  • Discuss basic fluid properties as well as the potential of liquid fallout if vaporized liquids are present in the reservoir.  The accuracy of proper separator settings is stressed as well the potential of hydrate formation.
  • Gas, oil and water rates measured at the surface must be recombined to accurately calculate total flow rates and original gas and oil in place.

Wet gas and condensate reservoirs

  • Information included in a typical compositional fluid analysis report is reviewed and discussed.
  • Calculate oil and gas in place from a compositional analysis report or from separator settings.
  • Apply the Eaton – Jacoby method and a fluid analysis report to calculate reserves from a pressure depleting reservoir.

Material balance methods

  • Compare recovery by a good water drive to the pressure depletion case to show the utility of producing at high rates.
  • Develop a general material balance equation for all subsurface conditions encountered in a gas reservoir.
  • Equations representing pressure depleting, water drive and over pressured conditions are developed.  Analysis procedures for each specific case are discussed.
  • Calculations representing in place oil and gas estimates, effects of water influx, and drive indices representing relative influence of water, gas and rock compressibility and water drive are developed.


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Upon request       Professor Emeritus Steven Poston Make enquiry

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Website: Studio Beam Ltd