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公开(公告)号:US06595305B1
公开(公告)日:2003-07-22
申请号:US09591644
申请日:2000-06-09
申请人: Curnie A. Dunn , Phillip W. Haga , Ted R. Massa , Douglas E. Bise , Gary J. Condon , Stephen T. Belsheim , James E. Rutherford
发明人: Curnie A. Dunn , Phillip W. Haga , Ted R. Massa , Douglas E. Bise , Gary J. Condon , Stephen T. Belsheim , James E. Rutherford
IPC分类号: E21B1038
CPC分类号: E21B10/55 , B23B51/00 , B23B2226/75 , B23B2240/08 , B23B2251/202 , B23B2251/50 , B23B2251/68 , E21B10/602
摘要: A rotary drill bit for penetrating earth strata wherein the drill bit includes a drill bit body that has an axial forward end. The drill bit body has a hard insert, which is preferably monolithic, that is affixed to the drill bit body at the axial forward end thereof. The hard insert presents at least three discrete leading cutting edges for cutting the earth strata.
摘要翻译: 一种用于穿透地层的旋转钻头,其中钻头包括具有轴向前端的钻头体。 钻头体具有硬嵌入件,其优选地是整体的,其在其轴向前端处固定到钻头体上。 硬嵌入件至少有三个离散的前缘切割刃,用于切割地层。