Coping Strategies of DTH Hammers in Complex Formations for Water Well Drilling Rigs

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The water well drilling rig DTH hammer needs these strategies for complex formations (like alternating hard-soft layers, fractured zones):

 

  1. Parameter adjustment: Lower impact and boost speed in soft rock; raise them in hard rock. Avoid uneven well diameters.
  2. Bit selection: Use “mixed pointed-flat teeth” bits for alternating layers. They meet both formation breaking needs.
  3. Wall protection: Adopt pipe-following drilling in fractured zones. The hammer drives casing forward to prevent collapse.

A mountain drilling project faced 5 alternating layers. These strategies helped the water well drilling rig finish an 80m well, keeping deviation under 1°.