Drill Bit Selection and Wear Mechanism of Water Well Drills in Expansive Soils

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Clay particles in expansive soils cause special wear on drill bits:

 

  1. Wear types:
    Adhesive wear (55%), abrasive wear (30%), fatigue wear (15%).
  2. Material preference:
    PDC bits use diamond composite sheets + tungsten carbide, extending life by 1.8 times.
  3. Structural innovation:
    Spiral blade design (pitch 120mm) reduces clay accumulation.drill bit