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How are the benefits of water-powered drilling easiest described compared to drilling with air-powered equipment?

Answer:

Water-powered drilling gives:

  •  Cleaner boreholes
  • Allow the cement grout to reach longer into the cavities without dust or oil traces
  • Better borehole surface
  • Optimal for use of packers

Whilst air-powered drilling gives:

  • Injection of dust and oil in the borehole that may cover surface and prevent the grout from efficiently connect to the bore hole wall and out to cavities
  • Rough surface that may be too coarse for packers