Technologies for Preventing and Handling Hole Shrinkage in Expansive Soil Drilling-Water Well Drilling Rig

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Hole shrinkage in expansive soils often appears “necked,” with three-level prevention and control measures:水井鑽機

 

  1. Prevention stage:
    Maintain mud density at 1.15–1.20 during drilling to form a dense mud cake.
  2. Monitoring stage:
    Use a caliper to measure in real time; activate emergency response when shrinkage rate exceeds 5%.
  3. Treatment stage:
    Employ a reaming bit (20mm larger than design diameter) with chemical consolidants.water well drilling rig