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    Iadc Bit Grading

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    anarkasis
    This document provides definitions for codes used in grading drill bits upon removal from a wellbore. The codes are divided into categories including cutting structure condition, bearings/seals, gauge size, dull characteristics, other characteristics, and reason for removal. Condition of cutting structures like teeth and inserts is graded on a scale of 0 to 8, with 0 being no wear and 8 being complete loss of structure. Bearing life is also graded on a 0 to 8 scale. Gauge size out of tolerance is noted in increments from 1/16 to 5/8 inch. Reasons for removal include downhole motor failure, drill string issues, or reaching total depth.

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    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd

    Iadc Bit Grading

    Uploaded by

    anarkasis
    992 views1 page
    This document provides definitions for codes used in grading drill bits upon removal from a wellbore. The codes are divided into categories including cutting structure condition, bearings/seals, gauge size, dull characteristics, other characteristics, and reason for removal. Condition of cutting structures like teeth and inserts is graded on a scale of 0 to 8, with 0 being no wear and 8 being complete loss of structure. Bearing life is also graded on a 0 to 8 scale. Gauge size out of tolerance is noted in increments from 1/16 to 5/8 inch. Reasons for removal include downhole motor failure, drill string issues, or reaching total depth.

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    This document provides definitions for codes used in grading drill bits upon removal from a wellbore. The codes are divided into categories including cutting structure condition, bearings/seals, gauge size, dull characteristics, other characteristics, and reason for removal. Condition of cutting structures like teeth and inserts is graded on a scale of 0 to 8, with 0 being no wear and 8 being complete loss of structure. Bearing life is also graded on a 0 to 8 scale. Gauge size out of tolerance is noted in increments from 1/16 to 5/8 inch. Reasons for removal include downhole motor failure, drill string issues, or reaching total depth.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    992 views1 page

    Iadc Bit Grading

    Uploaded by

    anarkasis
    This document provides definitions for codes used in grading drill bits upon removal from a wellbore. The codes are divided into categories including cutting structure condition, bearings/seals, gauge size, dull characteristics, other characteristics, and reason for removal. Condition of cutting structures like teeth and inserts is graded on a scale of 0 to 8, with 0 being no wear and 8 being complete loss of structure. Bearing life is also graded on a 0 to 8 scale. Gauge size out of tolerance is noted in increments from 1/16 to 5/8 inch. Reasons for removal include downhole motor failure, drill string issues, or reaching total depth.

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    Attribution Non-Commercial (BY-NC)
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    IADC : Dull Bit Grading

    Cutting structure
    Inner Outer Dull Char Location Example of bit grading : 2, 4, BT, M, E, X, (CT,WO), DTF. Bearings seals Gauge Other dull char Reason pulled

    5
    Roller cone N- Nose row

    6 4 - Location

    7
    Fixed cutter C - Cone N - Nose T - Taper

    1 - Inner cutting structure (All inner rows.) 2 - Outer cutting structure ( Gauge rows only.)
    In columns 1 and 2 a linear scale of 0 ---> 8 is used to describe the condition of the cutting structure according to the following guidelines for specific bit types.

    G - Gauge row

    S - Shoulder G - Guage A - All areas

    Steel toothed bits

    Measure of lost tooth height due to abrasion and / or damage

    0 - No loss of tooth height 8 - Total loss of tooth

    M - Middle row A - All Rows State cone # or #'s I.e. 1, 2, or 3.

    Insert bits

    Measures total cutting structure reduction of lost, worn, & or broken inserts 0 - No lost worn and / or broken inserts 8 - 0% of inserts and / or cutting structure remaining.

    5 - Bearings and seals


    Non sealed bearings
    A linear scale estimating bearing life is used 0 = No life used ---> 8, 100% bearing life used

    Fixed cutter bits

    Measure of lost tooth height due to abrasion and / or damage 0 - No lost, worn and / or broken cutting structure 8 - 100% of cutting structure lost, worn and / or broken

    Sealed bearings E - Seals effective F - Seals failed N - Not able to grade X - Fixed cutter bit 3/16-3/16" out of gauge
    7/16 - 7/16" out of gauge etc.

    6 - Gauge
    x - in gauge
    1/16 - 1/16" out of gauge 1/8 - 1/8" ut of gauge 1/4 - 1/14" out of gauge 5/16 - 5/16" out of gauge 3/8 -3/8" out of gauge 1/2 - 1/2" out of gauge 9/16 - 9/16" out of gauge 5/8 - 5/8" out of gauge

    3 - Dull characteristics
    Note: use only cutting structure related codes
    BC - Broken cone * BF - Bond failure BT - Broken teeth and cutters BU - Balled up bit CC - Cracked cone * CD - Cone dragged * CI - Cone interference CR - Cored CT - Chipped Teeth & cutters ER - Erosion FC - Flat crested wear HC - Heat checking LD - Junk damage LC - Lost cone * LN - Lost nozzle LT - Lost teeth and cutters OC - Off centre wear PB - Pinched bit PN- Plugged nozzle or flow by areas RG - Rounded gauge RO - Ring out SD - Shirttail damage SS - Shelf sharpening wear TR - Cone tracking WO - Wash out WT - Worn teeth or cutters NO - No dull characteristics

    7 - Other dull characteristics Refer to column 3 codes 8 - Reasons bit was pulled or run completed
    BHA- Change bottom hole assembly DMF - Downhole motor failure DTF - Downhole tool failure DSF - Drill string failure DST - Drill stem test DP - Drill Plug CM - Condition mud CP - Core point FM - Formation change HP - Hole problems LIH - Left in hole HR - Hours on bit LOG - Run logs PP - Pump pressure PR - Penetration rate Rig - Rig repair TD - Total depth / casing depth TW - Twist off TQ - Torque WC - Weather conditions

    * Show cone # or #'s under location 4

    Kingdom drilling services Ltd. www.kingdomdrilling.co.uk

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