Bit Selection Tips for DTH Hammers in Water Well Drilling Rigs

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Choosing bits for a water well drilling rig DTH hammer depends on rock formation properties:

 

  1. Alloy tooth shape: Pointed teeth suit hard, homogeneous rocks (granite) to focus impact. Flat teeth work for fractured rocks (weathered rock) with strong wear resistance.
  2. Tooth count design: Hard rocks need fewer teeth (6-8) to reduce contact area and increase pressure. Soft rocks require more teeth (10-12) to prevent excessive bit penetration.
  3. Material hardness: Use tungsten-cobalt alloy bits with HRC ≥ 60. They last 50-80 meters in basalt for water well drilling rig.

 

A project used pointed teeth in granite, drilling 85 meters per bit. Flat teeth only drilled 40 meters— a clear difference.