Cased Hole Drill Stem Testing

Outlines:

  • Test string components, tool operations.
  • Tool strings / components for cased holes.
  • Tool running, hydraulic effects.
  • Safety, well control.
  • Special precautions for H2S wells
  • Preparation / Planning.
  • Downhole conditions, factors affecting inflow.
  • Selecting flowing and closed-in times.
  • Identifying, measuring fluid recovery.
  • Example DST charts, qualitative analysis.
  • Format / nomenclature, flow / pressure effects.
  • Guidelines for analysis, example charts.
  • Calculations, quantitative analysis.
  • Buildup data plots, basic assumptions.
  • Estimating production rate from recovery.
  • Equations for permeability, flow capacity.
  • Damage ratio for liquids, gas.
  • Radius of investigation estimate.
  • Absolute open flow potential of gas wells.