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    Earth-boring bit having shear-cutting heel elements
    1.
    发明公开
    Earth-boring bit having shear-cutting heel elements 失效
    Erdbohrmeissel mit Umfangsscherelementen

    公开(公告)号：EP0747566A1

    公开(公告)日：1996-12-11

    申请号：EP96304207.2

    申请日：1996-06-06

    申请人： BAKER HUGHES INCORPORATED

    发明人： Scott, Danny E. ,  Pessier, Rudolf C.O. ,  Isbell, Matthew R. ,  Besson, Alain ,  Meany, Nigel

    IPC分类号： E21B10/52

    CPC分类号： E21B10/5673 ,  E21B10/52 ,  E21B10/5676 ,  E21B10/5735 ,  E21B17/1092

    摘要： An earth-boring bit has a bit body and at least one cantilevered bearing shaft depending inwardly and downwardly from the bit body. A cutter is mounted for rotation on the bearing shaft and includes a plurality of cutting elements arranged in generally circumferential rows including an outer or heel row of cutting elements. At least one of the cutting elements in the heel row has an outermost surface at least partially formed of super-hard material that defines a cutting edge for shearing engagement with the sidewall of the borehole as the cutters roll and slide over the bottom of the borehole during drilling operations.

    摘要翻译： 钻头具有一个位体，并且至少一个悬臂轴承轴从钻头体向内和向下偏移。 安装有用于在轴承轴上旋转的切割器，并且包括多个切割元件，所述多个切割元件布置成大致圆周的行，包括外部或后排的切割元件。 脚跟行中的至少一个切割元件具有至少部分由超硬材料形成的最外表面，该超硬材料限定用于与钻孔的侧壁剪切接合的切割刃，因为切割器在钻孔底部滚动并滑动 在钻井作业中。