Transcription of IADC Dull Grading - Halliburton
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IADC Dull Grading - Halliburton
Drill Bits Fixed Cutter IADC dull Grading Cutting Structure Inner Rows Outer Rows dull Char. Location Bearings/Seals Gauge Other dull Char. Reason Pulled 1 2 3 4 X 6 7 8. Inner Area Outer Area 1 Inner Cutting Structure 4 Location 2/3 Radius 1/3 Radius 2 Outer Cutting Structure A - All Areas C - Cone A measure of lost, worn and/or G - Gauge broken cutting structure. N - Nose HAL9086. Linear Scale: 0-8. S - Shoulder 0 - No lost, worn and/or broken T - Taper cutting structure 5 X. 8 - All of cutting structure lost, 6 Gauge worn and/or broken (Measure in fractions of an inch). 3 dull Characteristics I - In Gauge BF - Bond Failure 1 - 1/16" Out of Gauge BT - Broken Cutters 2 - 1/8" Out of Gauge BU - Balled Up 4 - 1/4" Out of Gauge Gauge CR - Cored 7 Other dull Characteristics Shoulder CT - Chipped Cutters (Refer to column 3 codes).
FIXED CUTTER BITS - RING GAUGING Any fixed cutter bit should be ring gauged prior to running in the hole. Stabilizers should also be calipered or gauged to verify they
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