Hoja1IADC : Dull Bit GradingCutting structureExample of bit grading : 2, 4, BT, M, E, X, (CT,WO), DTF.Inner hilera internaOuter hilera externaDull Char Caracteris.Location LocalizacinBearings seals Cogine-SellosGauge CalibreOther dull char Otras caracte.Reason pulled Razon sacada123456781 -Inner cutting structure (All inner rows.)4 -Location2 -Outer cutting structure ( Gauge rows only.)Roller coneFixed cutterIn 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.N- Nose row narizG - Gauge row calibreC - Cone conoS - Shoulder hombroSteel toothed bitsMeasure of lost tooth height due to abrasion and / or damageM - Middle rowA - All RowsN - NoseG - Guage0 -No loss of tooth heightState cone # or #'s I.e. 1, 2, or 3.T - Taper (Flaco)A - All areas8 -Total loss of toothInsert bitsMeasures total cutting structure reduction of lost, worn, & or broken inserts5 -Bearings and seals0 -No lost worn and / or broken insertsNon sealed bearingsSealed bearings8 -0% of inserts and / or cutting structure remaining.A linear scale estimating bearing life is usedE - Seals effectiveF - Seals failedFixed cutter bitsMeasure of lost tooth height due to abrasion and / or damage0 = No life used ---> 8, 100% bearing life usedN - Not able to gradeX - Fixed cutter bit0 -No lost, worn and / or broken cutting structure6 -Gauge8 -100% of cutting structure lost, worn and / or brokenx - in gauge1/16 - 1/16" out of gauge1/8 - 1/8" ut of gauge3/16-3/16" out of gauge3 -Dull characteristics1/4 - 1/14" out of gauge5/16 - 5/16" out of gauge3/8 -3/8" out of gauge7/16 - 7/16" out of gaugeNote:use only cutting structure related codes1/2 - 1/2" out of gauge9/16 - 9/16" out of gauge5/8 - 5/8" out of gaugeetc.BC - Broken cone * (cono roto)LN - Lost nozzle (perdida de boquilla)7 -Other dull characteristicsBF - Bond failure (falla de pega/adherencia) #LT - Lost teeth and cutters (cortadores perdidos)Refer to column 3 codesBT - Broken teeth and cutters (cortadores rotos)OC - Off centre wear (desgaste descentrado)8 -Reasons bit was pulled or run completedBU - Balled up bit (embolamiento)PB - Pinched bitBHA- Change bottom hole assembly (cambio BHA)HR - Hours on bit (tiempo en hoyo)CC - Cracked cone * (cono fisurado)PN- Plugged nozzle or flow by areas (boq,canal tapado)DMF - Downhole motor failure (falla de MF)LOG - Run logs (registros)CD - Cone dragged * (cono daado)RG - Rounded gauge (calibre redondeado)DTF - Downhole tool failure (falla de hta de fondo)PP - Pump pressure (tasa de penetracin)CI - Cone interference (interferencia de cono)RO - Ring out (anillada) #DSF - Drill string failure (prueba de produccin)PR - Penetration rate (tasa de penetracin)CR - Cored (coroneo,desgaste en centro)SD - Shirttail damageDST - Drill stem test (prueba de produccin)Rig - Rig repair (reparacion de taladro)CT - Chipped Teeth & cutters (corta. astillados)SS - Shelf sharpening wearDP - Drill Plug (tapon de cemento)TD - Total depth / casing depth (prof. Total)ER - ErosionTR - Cone tracking (degaste encarrilado)CM - Condition mud (acondicionar lodo)TW - Twist off (desconexin)FC - Flat crested wear (desgaste plano)WO - Wash out (filtracion de broca)CP - Core point (profundidad de nucleo)TQ - TorqueHC - Heat checking (fatiga termica)WT - Worn teeth or cutters (cortador desgastado)FM - Formation change (cambio de formacin)WC - Weather conditions (clima)JD - Junk damage (perf. Sobre chatarra)NO - No dull characteristics (sin desgaste)HP - Hole problems (problemas de hoyo)LC - Lost cone * (cono perdido)* Show cone # or #'s under location 4LIH - Left in holeBHA- Change bottom hole assembly (cambio BHA)

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