Undergauge Borehole

When drilling long sections of abrasive formations, the gauge protection on the bit and stabilizers can become so worn it becomes ineffective. Any additional hole that is drilled will be undergauge. Preventive measures include:

  1. Properly gauge the bit and stabilizers after each run
  2. Ream back to bottom if an undergauge hole is suspected
  3. Never force a new bit to bottom
  4. Select bits with good gauge protection (5&7 feature in roller
  5. Carefully run fixed cutter bits after roller cone bits

If the new bit is run into an undergauge hole, maximum upwards working/ jarring forces should be applied immediately.

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Responses

  • stefan
    What is a borehole undergauge?
    7 years ago
  • max baader
    What is underguage hole?
    10 months ago

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