IADC Fixed Cutter Dull Grade Reference
Cutting Structure
Inner Row
Numerals 0-8
0 : no damage or missing cutting structure.
8 : all cutting structure damaged or missing.
Outer Row
Numerals 0-8
0 : no damage or missing cutting structure.
8 : all cutting structure damaged or missing.
Dull Characteristics
- BF - Bond Failure
- BT - Broken Cutters
- BU - Balled Up
- CR - Cored
- CT - Chipped Cutters
- DL - Delaminated Cutters
- ER - Erosion
- HC - Heat Checking
- JD - Junk Damage
- LM - Lost Matrix
- LN - Lost Nozzle
- LT - Lost Cutters
- NO - No Dull Characteristics
- NR - Not Rerunnable
- PN - Plugged Nozzle/Flow Passage
- RO - Ring Out
- RR - Rerunnable
- WO - Washed Out
- WT - Worn Cutters
Location
- A - All Areas
- C - Cone
- G - Gauge
- N - Nose
- S - Shoulder
- T - Taper
Bearing/Seals
N/A
Gauge
- I - In Gauge
- 1 - 1/16" Out
- 2 - 1/8" Out
- 4 - 1/4" Out
Other Dull Char.
Use Dull Char. Codes
Reason Pulled
- BHA - Change Bottomhole Assembly
- CM - Condition Mud
- CP - Core Point
- DMF - Downhole Motor Failure
- DP - Drill Plug
- DSF - Drill String Failure
- DST - Drill Stem Test
- DTF - Downhole Tool Failure
- FM - Formation Change
- HP - Hole Problems
- HR - Hours on Bit
- LIH - Left in Hole
- LOG - Run Logs
- PP - Pump Pressure
- PR - Penetration Rate
- RIG - Rig Repair
- TD - Total Depth/Casing Depth
- TQ - Torque
- TW - Twist Off
- WC - Weather Conditions
- WO - Washout - Drill String