FIXED CUTTER IADC Dull Grading

Inner Cutting Structure Outer Cutting Structure A measure of lost,worn and/or broken cutting structure.Linear Scale:0-80- No lost,worn and/or broken cutting structure.8-All of cutting struc ture lost,worn and/or broken.Dull Characteristics BF -Bond Failure NR -Not Rerunable BU -Balled Up OC -Off Center Wear BT -Broken Teeth/Cutters PN -Plugged Nozzle/Flow Passage CR -Cored RG -Rounded Gage CT -Chipped Teeth/Cutters RO -Ring Out ER -Erosion NO -No Dull Characteristic FC -Flat Crested Wear RR -Rerunable HC -Heat Checking TR -Tracking (and Spalling)WO - Washed Out Bit JD -Junk Damage WT -Worn Teeth/Cutters*LN -Lost Nozzle NO -No Major Characteristics LT -Lost Teeth/Cutters** Location C -Cone S -Shoulder N -Nose G -Gage T -Taper A -All Areas X Gauge I -In Gauge 1/16-1/16" Undergauge 2/16-1/8" Undergauge Other Dull Characteristics (Refer to column 3 codes)Reason Pulled or Run Terminated BHA -Change Bottom Hole Assembly FM -Formation Change HP -Hole Problems DMF -Downhole Motor Failure HR -Hours DST - Drill Stem Test PP - Pump Pressure DTF - Downhole Tool Failure TD - Total Depth/Casing Depth LOG -R un Logs TQ -Torque RIG -Rig Repair TW -Twist Off CM -Condition Mud WC - Weather Conditions CP - Core Point WO - Washout - Drill String DP - Drill Plug

67823451876X 342

1CUTTING STRUCTURE INNER

OUTER DULL LOCATION BEARINGS/

OTHER DULL REASON ROWS ROWS CHAR.SEAL X GAUGE CHAR.PULLED

Security DBS Fixed Cutter Bits - IADC Dull Grading

Inner Area 2/3 Radius Gage

Shoulder

No Wear Worn Cutter (WT)

Lost Cutter (LT)Lost Cutter (LT)

Taper

Nose Cone

Outer Area

1/3 Radius

*

**

H A L 9045H

A L 9085H

A L 9086H A L 9045

Produced by Halliburton Communications

https://www.wendangku.net/doc/e56710489.html, Sales of Halliburton products and services will be in accord solely with the terms and conditions contained in the contract between Halliburton and the customer that is applicable to the sale.H03086 04/02? 2002 Halliburton All Rights Reserved Printed in U.S.A.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

meet API - approved outside dimension tolerances as shown

in the following table.Fixed cutter bits should not be larger than

the nominal diameter.

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.

API Fixed Cutter Bit Tolerances

FIXED CUTTER BIT

BIT SIZE O.D. TOLERANCE

IN. IN.

6-3/4 and Smaller -0.015 to +0.00

6-25/32 to 9-0.020 to +0.00

9-1/32 to 13-3?4-0.030 to +0.00

13-25/32 to 17-1?2-0.045 to +0.00

17-17?32 and Larger -0.063 to +0.00