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8 1/2″XHP2 S型三牙轮钻头是成都石油总机械厂设计制造的。它采用滑动密封轴承、喷射式水眼和镶有硬质合金瓢形齿。它的结构合理,使用寿命长,机械钻速高,保径效果好,是钻凿软地的一种高效新型钻头。1983年7月至1984年7月共试制三批计34只。现场使用25只,平均进尺300.87,米,其中最高进尺715.54米;平均纯钻时间56小时03分、最高纯钻时间102小时24分;平均机械钻速5.36米/小时,在相同地层条件下比8 1/2″XHP2型钻头
8 1/2 “XHP2 S Tri-cone Drill bit is designed and manufactured by Chengdu General Machinery Plant and it is made of sliding seal bearing, jetted water eye and carbide toothbrush with reasonable structure and long service life , High ROP, high gage effect, is a high efficiency drilling new type of drill bit.From July 1983 to July 1984 a total of three batches of 34 trial.Time use of 25, the average footage of 300.87 meters , Of which the highest footage was 715.54 meters; the average diamond drilling time was 56 hours and 03 minutes, the highest pure drilling time was 102 hours and 24 minutes; the average penetration rate was 5.36 meters / hour and was lower than that of the 8 1/2 ”XHP2 bit