三牙轮钻头规范.doc

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1、三牙轮、PDC钻头规范钻头直径连接螺纹钻头直径连接螺纹33/4″95.223/8REG外螺纹91/2″241.365/8REG外螺纹41/8″104.895/8″244.541/4″107.997/8″250.841/2″114.3PDC钻头27/8REG外螺纹105/8″269.945/8″117.5113/4″298.443/4″120.627/8REG外螺纹121/4″311.155/8″142.931/2REG外螺纹131/2″342.957/8″149.2135/8″346.16″152.

2、4143/4″374.675/8REG外螺纹61/4″158.7151/2″393.761/2″165.1171/2″444.563/4″171.420″50881/2或75/8REG71/2″190.541/2REG外螺纹24″609.677/8″20026″660.483/8″212.781/2″215.983/4″222.2