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1. 发明授权

US5145017A Kerf-cutting apparatus for increased drilling rates 失效
标题翻译：提高钻井速度的切角机
公开(公告)号：US5145017A
公开(公告)日：1992-09-08
申请号：US638234
申请日：1991-01-07
申请人： Jesse L. Holster , Roy D. Estes , Jack Castle , Paul G. Parys
发明人： Jesse L. Holster , Roy D. Estes , Jack Castle , Paul G. Parys
IPC分类号： E21B10/04 , E21B10/14 , E21B10/48
CPC分类号： E21B10/14 , E21B10/04 , E21B10/485
摘要： An improved earth drilling bit and method that cuts at least one annular kerf ahead of at least one rolling cutter and provides for rock chip removal and bit cooling thereby increasing drilling rate and bit performance. One embodiment of the invention includes a bit body having a lower end forming an annular kerf cutter for cutting an outer annular kerf, an inner drill member positioned concentrically within the bit body having a lower end forming an annular kerf cutter for cutting an inner annular kerf, and at least one rolling cutter mounted to the bit body and extending from the interior of the outer kerf cutter to the longitudinal axis of the drill bit. Other embodiments include a chipway port defined by the drill bit for channeling rock chips away from beneath the bit; baffles for directing and accelerating drilling fluid flow; cutting edges having connecting webbs providing egress for rock chip and drilling fluid; and slots extending along the bit body for reducing surge and swab pressure.
摘要翻译：一种改进的地钻钻头和方法，其在至少一个轧制切割机之前切割至少一个环形切口，并提供岩屑去除和钻头冷却，从而提高钻井速率和钻头性能。本发明的一个实施例包括具有下端的钻头体，其形成用于切割外部环形切口的环形切割刀具，同心地位于钻头体内的内部钻头构件，其具有形成用于切割内部环形切口的环形切口切割器以及安装在钻头体上并从外切割刀的内部延伸到钻头的纵向轴线的至少一个轧制刀具。其他实施例包括由钻头限定的用于将岩石碎屑引导到钻头下方的切屑口; 引导和加速钻井液流动的挡板; 切割边缘具有提供岩石芯片和钻井液的出口的连接网; 以及沿钻头体延伸的槽，用于减少浪涌和拭子压力。

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