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旧钻头磨损等级系列尺寸和代号钻头磨损等级系列既适用于牙轮钻头，也适用于金刚石钻头复合片、热稳片钻头及取芯钻头。可用于钻头报表、钻井日报和数据库。Thedullgradingsystemappliesbothtorollerbitsanddiamondbits,PDC,TSPandcorebits.thesystemisflexibleenoughforuseinthebitreports,dailyreportsanddatabases.Cuttingstructure切削结构BGRemarks备注内排Innerroles外排Outerrows磨损特征Characteristics位置Location轴承和密封Bearing/seais保径Gage1/16in其它磨损Dull起因Reasonpulled表1表2表3表4表5表6表7表8表1Inner:inner2/3ofbit内：钻头内面的2/3Outer:outer1/3ofbit外：钻头外面的1/30=nowear~~~8=nouseablecuttingstructure不能用的切削结构表2BC=Brokencone牙轮破裂BT=Brokenteeth/cutters赤、刃断裂BU=Balledup泥包CC=Crackedcone牙轮破裂CD=Conedragged牙轮卡死CI=Coneinterference牙轮互咬CR=Cored取心夹心CT=Chippedteeth/cutters齿刃掉块ER=Erosion腐蚀FC=FlatCrestedwear平顶磨损HC=Heatedchecking烧钻JD=JunkDamage落物磨损LC=LostCone牙轮脱落LN=Lostnozzle喷嘴脱落LT=LostTeeth/cutters齿刃脱落OC=off-centerwear偏心磨损PB=pinchedbit钻头受挤PN=pluggednozzle/flowpassage喷嘴或流径堵塞RG=Roundedgauge保径磨圆RO=Ringout密封环脱落SD=Shirttaildamage牙爪下部磨损SS=SelfSharpeningwear目锐磨损TR=Tracking挂痕WO=washedout-bit钻头冲蚀WT=Wornteeth/cutters齿刃磨损NO=Nomajor/otherdullcharacteristics无主要和其它磨损特征Showconenumber(s)underlocation*其后注明锥体或牙轮数表3Fixedcutterbits固刃钻头牙轮钻头C=cone锥体N=Nose(row)锥顶（排）T=Taper锥面S=Shoulder台肩G=Gauge保径A=Allareas/rows所有的面或排N=Noserows顶排牙轮1M=middlerows中排2H=heelrows边缘排3A=Allrows个排表4表5Non-sealedbearing无密封轴承0=nolifeused全新8=alllifeused用废Sealedbearings:密封轴承E=Sealseffective密封失效F=Sealsfailed密封失败XFixedcutterbits固刃钻头diamond,PDS,TSP金刚石、复合片、热稳片I=Ingage保径0to1/16inundergage小于保径0-1/16英寸1/16to1/8inundergage小于保径1/16-1/8英寸表6BHA=ChangeBottomholeAssembly改变井下组合DMF=DownholeMotorfailure井下马达失效DSF=DrillStemFailure钻柱损坏DST=DrillStemTest钻具测试DTF=DownholeToolfailure井下钻具故障CM=ConditionMud泥浆状态变坏CP=CorePoint到取心点DP=DrillPlug钻水泥塞FM=FormationChange地层变化HP=HoleProblems井下出问题LOG=RunLogs进行测井PP=PumpPressure泵压异常PR=PenetrationRate钻速变化RIG=RigRepairs修理设备TD=TotalDepth/CSG.depth总深度/套管深度TQ=Torque扭矩TW=Twist-off脱扣。扭断WC=Weatherconditions天气状况WO=Washout-drillstring冲蚀钻柱HR=Hoursonbit长时间纯钻