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    • 1. 发明授权
    • Rotary drill bits exhibiting sequences of substantially continuously variable cutter backrake angles
    • 旋转钻头具有基本上连续可变的切割器后退角度的顺序
    • US06536543B2
    • 2003-03-25
    • US09730983
    • 2000-12-06
    • Matthew J. MeinersJeffrey B. LundThomas M. Harris
    • Matthew J. MeinersJeffrey B. LundThomas M. Harris
    • E21B1016
    • E21B10/43E21B10/55
    • A rotary-type earth-boring drag bit with cutters oriented at varied rake angles and methods for designing such drag bits. Specifically, cutters that are located sequentially adjacent radial distances from a longitudinal axis of the drill bit have cutting faces that are oriented at rake angles that differ from one another. These cutters may be located on the same blade of the drag bit or on different blades of the drag bit. The rake angles at which the cutting faces of these cutters are oriented may be based, at least in part, on the relative radial distances these cutters are spaced from the longitudinal axis of the drag bit, on the vertical positions of these cutters along the longitudinal axis of the drag bit, or in response to actual or simulated evaluations of the use of the drag bit to drill a subterranean formation.
    • 一种旋转式镗孔钻头,其刀具以不同的前角定向,并且用于设计这种拖曳钻头的方法。 具体来说,与钻头的纵向轴线顺序地相邻的径向距离的切割器具有在彼此不同的前角处定向的切割面。 这些刀具可以位于拖曳钻头的相同刀片上或者位于不同刀片上的阻力钻头上。 这些切割器的切割面的取向角可以至少部分地基于相对径向距离,这些切割器与拖曳钻头的纵向轴线在这些切割器沿着纵向的垂直位置间隔开 或者响应于使用拖曳钻头来钻取地层的实际或模拟评估。
    • 2. 发明授权
    • Methods for designing rotary drill bits exhibiting sequences of substantially continuously variable cutter backrake angles
    • 设计旋转钻头的方法,其显示基本上连续可变的切割器反向角度的顺序
    • US06711969B2
    • 2004-03-30
    • US10328615
    • 2002-12-23
    • Matthew J. MeinersJeffrey B. LundThomas M. Harris
    • Matthew J. MeinersJeffrey B. LundThomas M. Harris
    • B03C300
    • E21B10/43E21B10/55
    • A rotary-type earth-boring drag bit with cutters oriented at varied rake angles and methods for designing such drag bits. Specifically, cutters that are located sequentially adjacent radial distances from a longitudinal axis of the drill bit have cutting faces that are oriented at rake angles that differ from one another. These cutters may be located on the same blade of the drag bit or on different blades of the drag bit. The rake angles at which the cutting faces of these cutters are oriented may be based, at least in part, on the relative radial distances these cutters are spaced from the longitudinal axis of the drag bit, on the vertical positions of these cutters along the longitudinal axis of the drag bit, or in response to actual or simulated evaluations of the use of the drag bit to drill a subterranean formation.
    • 一种旋转式镗孔钻头,其刀具以不同的前角定向,并且用于设计这种拖曳钻头的方法。 具体来说,与钻头的纵向轴线顺序地相邻的径向距离的切割器具有在彼此不同的前角处定向的切割面。 这些刀具可以位于拖曳钻头的相同刀片上或者位于不同刀片上的阻力钻头上。 这些切割器的切割面的取向角可以至少部分地基于相对径向距离,这些切割器与拖曳钻头的纵向轴线在这些切割器沿着纵向的垂直位置间隔开 或者响应于使用拖曳钻头来钻取地层的实际或模拟评估。