公开(公告)号：US20130180782A1

公开(公告)日：2013-07-18

申请号：US13349246

申请日：2012-01-12

申请人： Silvino M. Ersan ,  Anthony Phillips ,  Maurilio V. Solano ,  Rodolf C. Pessier ,  Thorsten Schwefe

发明人： Silvino M. Ersan ,  Anthony Phillips ,  Maurilio V. Solano ,  Rodolf C. Pessier ,  Thorsten Schwefe

IPC分类号： E21B10/26

CPC分类号： E21B10/26 ,  E21B7/20 ,  E21B10/54

摘要： A reaming bit designed to operate with low torque fluctuation when driven with a turbine at speeds in the order of 300-600 RPM and above features a profile that is arcuate from the gauge dimension to the nose area or alternatively has a blunt straight taper section but with a ratio of profile length (PL) to bit size (BS) of under 0.75. The blades extend into a concave cone and the cutting structure continues along the blades towards the center. The blades have a step near the gauge section to increase the exposure of the blade cutting structure. An array of protrusions are disposed parallel to and behind the cutting structure to increase high speed stability and adjacent the blade step transition to protect outer casing on run in.

摘要翻译： 当涡轮机以300-600RPM及以上的速度驱动时，设计用于以低扭矩波动运行的铰孔，具有从规格尺寸到鼻部区域弧形的轮廓，或者具有钝的直锥形截面，但是 轮廓长度（PL）与钻头尺寸（BS）的比值低于0.75。 刀片延伸到凹锥体中，并且切割结构沿着刀片朝向中心继续。 叶片具有靠近测量部分的台阶，以增加叶片切割结构的曝光。 平行于切割结构并在切割结构之后设置一组突起，以增加高速稳定性并且邻近叶片台阶转变以在运行时保护外壳。