Bit Wear

DESIRED BIT WEAR
  PHYSICAL OBSERVATIONS Desired Bit Wear
  1. Bit face and gage wearing evenly
  2. Even diamond distribution
  3. "Tear Dropping" behind diamonds
  PROBABLE CAUSES
  1. Proper bit selection
  2. Ideal fluid flow
  3. Proper RPM
  4. Ideal bit weight
  OBSERVATION & POSSIBLE SOLUTIONS
  1. Ideal bit for the formation
CHIPPED MATRIX
  PHYSICAL OBSERVATIONS Chipped Matrix
  1.Section of bit face chipped
  PROBABLE CAUSES
  1. Bit set on bottom too hard
  2. drill string dropped to hole bottom
  OBSERVATION & POSSIBLE SOLUTIONS
  The bit should always be set on bottom carefully AFTER circulation has been established to clean hole. Once damaged, the bit face will wear. extremely fast.
I.D.GAGE
  PHYSICAL OBSERVATIONS I.D. Gage
  1. I.D.gage worn
  PROBABLE CAUSES
  1. Unconsolidated or fractured formation
  2. Insufficient and unequal Fluid
  3. Possible mismatch
  4. High bit weight
  5. Improper inner tube adjustment
  OBSERVATION & POSSIBLE SOLUTIONS
  1. Use a harder matrix
  2. Increase fluid flow
  3. Check inner tube adjustment
  4. Reduce bit weight
  5. Increase RPM

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