IADC Dull Grading - Halliburton

1 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).

2 DL - Delaminated Cutters Taper Cone ER - Erosion 8 Reason Pulled or Run Terminated HAL9085. Nose HC - Heat Checking BHA - Change Bottomhole Assembly JD - Junk Damage CM - Condition Mud LM - Lost Matrix CP - Core Point LN - Lost Nozzle DMF - Downhole Motor Failure LT - Lost Cutters DP - Drill Plug NO - No dull Characteristics HAL9045. No Wear Worn Cutter DSF - Drill String Failure NR - Not Rerunnable DST - Drill Stem Test PN - Plugged Nozzle/Flow Passage DTF - Downhole Tool Failure RO - Ring Out FM - Formation Change RR - Rerunnable HP - Hole Problems WO - Washed Out HR - Hours on Bit Lost Cutter Delaminated WT - Worn Cutters LIH - Left in Hole HAL9045.

3 LOG - Run Logs Halliburton 's fixed cutter bits PP - Pump Pressure are tip ground to exacting toler- PR - Penetration Rate ances at gauge per API spec 7. RIG - Rig Repair Depending on the specific design and application as much as .080 of an TD - Total Depth/Casing Depth inch of the cutter diameter may be TQ - Torque ground flat. This can be mistaken for TW - Twist Off gauge wear if unfamiliar with our WC - Weather Conditions products. Please ensure that dull bits are in gauge with a calibrated PDC WO - Washout - Drill String No Go ring gauge. Drill Bits FIXED CUTTER BITS - RING GAUGING. Any fixed cutter bit should be ring gauged prior to running in the hole.

4 Stabilizers should also be calipered or gauged to verify they meet API-approved outside dimension tolerances as shown in the following table. Fixed cutter bits should not be larger than the nominal diameter. API Fixed Cutter Bit Tolerances BIT SIZE FIXED CUTTER BIT. (IN.) TOLERANCE (IN.) 6-3/4 and Smaller to + 6-25/32 to 9 to + 9-1/32 to 13-3/4 to + 13-25/32 to 17-1/2 to + 17-17/32 and Larger to + A no go gauge is used to ensure a bit is not smaller than allowed and, as the name implies, it should not go or slip down the entire length of the bit. A go gauge ensures a bit is not larger than allowed and should slip down the entire bit.

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