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    • 6. 发明授权
    • Cutting structures for rotary drill bits
    • 旋转钻头切割结构
    • US5992549A
    • 1999-11-30
    • US949178
    • 1997-10-10
    • John Michael Fuller
    • John Michael Fuller
    • E21B10/54E21B10/55E21B10/56E21B10/567E21B10/60E21B10/46E21B10/62
    • E21B10/55E21B10/567E21B10/5676E21B10/602E21B2010/566
    • A cutting structure for a rotary drag-type drill bit includes a preform cutting element mounted on a carrier which, in use, is mounted on the drill bit and comprises a front facing table of superhard material bonded to a less hard substrate. A portion of the carrier on which the preform cutting element is mounted is shaped, adjacent the cutting element, for engagement by a chip of formation material being removed by the cutting element from the formation being drilled so as to tend to break the chip away from the surface of the formation. A portion of the carrier, or a portion of the bit body itself, may also be shaped, adjacent the cutting element, to direct to a location in front of the cutting element a flow of drilling fluid which impinges on said surface so as to assist in chip removal.
    • 用于旋转式拖曳式钻头的切割结构包括安装在载体上的预成型件切割元件,所述预制件切割元件在使用中安装在钻头上并且包括结合到较不硬的基底的超硬材料的前表面。 其上安装有预成型件切割元件的载体的一部分与切割元件相邻地成形,以便由被切割元件移除的成形材料芯片与被钻孔的地层接合,从而使芯片远离 地层的表面。 载体的一部分或钻头体本身的一部分也可以与切割元件相邻地成形,以引导到切割元件前面的位置,撞击在所述表面上的钻井流体流,以便协助 在芯片去除。