Drilling Tips for Water Well Drilling Rig in Different Rock Hardness

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Water well drilling rigs need varied techniques for rocks of different hardness.water well drilling rig

 

  1. In clay layers (f<2), use auger drilling. Keep speed at 200r/min; increase mud flow. Mud buoyancy carries cuttings to prevent hole collapse.
  2. For limestone (f=5-7), switch to roller cone drilling. Bits roll and crush rock. Lower speed to 8-10m/h; check cone wear hourly. Replace broken teeth promptly. If caves exist, reduce bit pressure and use casing following.
  3. For granite (f>8), use impact-rotary drilling. High-frequency impacts (800-1000 times/min) plus low rotation (50-80r/min) crush rock. A water well drilling rig should lift bits every 3 meters to check. Ensure drill pipe connections are tight to avoid tool breakage from excess torque.