钻铤：钻铤是用来给钻头提供钻压，使钻杆处于受拉状态，并以其较大的刚度扶正钻头保持井眼轨迹的重要工具。DrillCollarDrillCollarismainlyusedtoprovidedrillingpressuretodrillbitsothatdrillpipeisintension.Especiallydrillcollarcankeepdrillbitcentralizedandholetrackbylargerigidity.SpecificationsandparametersofDrillCollar:钻铤编号collarSeriesnumber外径O.D.内径I.D.长度lengthmm台肩倒角直径Circularbeadchamferdiameter参考的弯曲强度比ReferencedbendstrengthratiomminmminNC23-3179.431/831.811/2915076.22.57:1NC26-35(23/8IF)88.931/238.111/2915082.92.42:1NC31-41(27/8IF)104.841/850.829150100.42.43:1NC35-47120.643/450.829150114.72.58:1NC38-50(31/2IF)127.0557.221/49150121.02.38:1NC44-60152.4657.221/49150&9450144.52.49:1NC44-60152.4671.4213/169150&9450144.52.84:1NC44-62158.861/457.221/49150&9450149.22.91:1NC46-62(4IF)158.861/471.4213/169150&9450150.02.63:1NC46-65(4IF)165.161/257.221/49150&9450154.82.76:1NC46-65(4IF)165.161/271.4213/169150&9450154.83.05:1NC46-67(4IF)171.463/457.221/49150&9450159.53.18:1NC50-67(41/2IF)171.463/471.4213/169150&9450159.52.37:1NC50-70(41/2IF)177.8757.221/49150&9450164.72.54:1NC50-70(41/2IF)177.8771.4213/169150&9450164.72.73:1NC50-72(41/2IF)184.271/471.4213/169150&9450169.53.12:1NC56-77196.873/471.4213/169150&9450185.32.70:1NC56-80203.2871.4213/169150&9450190.13.02:165/8REG209.681/471.4213/169150&9450195.72.93:1NC61-90228.6971.4213/169150&9450212.63.17:175/8REG241.391/276.239150&9450223.82.81:1NC70-97247.693/476.239150&9450232.82.57:1NC70-1002541076.239150&9450237.32.81:185/8REG279.41176.239150&9450266.72.84:1)