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美国ＤｉａｍｏｎｄＰｒｏｄｕｃｔｓ国际公司设计并推出一种经改进的ＳｐｅｅｄＲｅａｍｅｒ牌双中心ＰＤＣ钻头 ,可以改善力的平衡 ,减小大转矩和钻杆柱横向振动现象。钻井时 ,导眼钻头中心在井眼中轴线上 ;起 (下 )钻时 ,则偏离中心线。这种钻头可使井身尺寸比套管的“穿过?
American DiamondProducts International Inc. has designed and introduced an improved SpeedReamer brand dual-center PDC drill bit that improves force balance and reduces large torque and lateral vibrations of the drill string. Drilling, the pilot drill bit center axis in the borehole; from (under) drill, then deviate from the centerline. This kind of bit allows the borehole size to be “passed” through the casing.