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

Lajme 39 Pamje
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°.