Gas Condensate Well Testing - PowerPoint PPT Presentation

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Gas Condensate Well Testing

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... [with respect to log ... Well Testing using a Single Phase Analogy Well Test Analysis in Gas Condensate Reservoirs A Novel Methodology for Well Test Analysis ... – PowerPoint PPT presentation

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Title: Gas Condensate Well Testing


1
Gas Condensate Well Testing
1-phase pseudopressure (excludes condensate
blockage)
2-phase pseudopressure (includes condensate
blockage)
  1. Transient data during a pressure build-up can be
    analyzed to try and understand gas condensate
    well performance, by plotting the change in
    pseudopressure and its derivative with respect
    to log(Dt) on a log-log plot.
  2. The build-up analysis is influenced by a
    near-well condensate bank with reduced krg.
    Using a single-phase gas pseudopressure to
    interpret well test data usually requires a
    radial-composite model with 2 zones. This will
    give information on the gas permeability in the
    bank and the size of the bank.
  3. Some wells may show 3-region composite radial
    behavior, caused by increased gas mobility at
    high capillary numbers near to the well. This is
    an area of current research.
  4. Using two-phase pseudopressure to interpret well
    test data requires a set of relative permeability
    curves, krgf(krg/kro,Nc), and uses the
    steady-state flow theory (e.g. Fevang-Whitson
    method) to calculate pseudopressure, resulting in
    normal semi-log radial behavior.
  5. Multi-rate tests can also be used to understand
    condensate well performance, by history matching
    single-well simulation models. This is usually
    the most reliable way of confirming the benefit
    of capillary number effects.

2
  • References
  • Practical Considerations in Gas Condensate Well
    Tests
  • Gas Condensate Well Testing using a Single Phase
    Analogy
  • Well Test Analysis in Gas Condensate Reservoirs
  • A Novel Methodology for Well Test Analysis in Gas
    Condensate Reservoirs

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