Causes Of Bit Failure

  • Misapplication
  • Wrong bit for formation (bit too soft or too hard)
  • Wrong diamond size for formation
  • Incorrect or inappropriate operating conditions
  • formation impaction (fluid volume/velocity insufficient to keep channels or bit face
  • Loss of gauge
  • Reaming to bottom too quickly or with excessive weight
  • Insufficient gauge protection
  • Plugged bit
  • Insufficient fluid to keep bit clean
  • Washout in string
  • Junk pumped down string causing plugging
  • LCM or swabbing to bottom too quickly
  • Ring out
  • Junk in hole - Insufficient cutter coverage
  • Bad Design

COMMON PROBLEMS AFFECTING PDC, NATURAL AND THERMALLY STABLE DIAMOND BIT PERFORMANCE

COMMON PROBLEM

PROBABLE CAUSE

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