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    • 10. 发明申请
    • REAMER
    • 铰刀
    • WO2016014449A1
    • 2016-01-28
    • PCT/US2015/041224
    • 2015-07-21
    • SCHLUMBERGER CANADA LIMITEDSERVICES PETROLIERS SCHLUMBERGERSCHLUMBERGER HOLDINGS LIMITEDSCHLUMBERGER TECHNOLOGY B.V.PRAD RESEARCH AND DEVELOPMENT LIMITEDSCHLUMBERGER TECHNOLOGY CORPORATION
    • HIRD, Jonathan RobertJOHNSON, Ashley BernardTUNC, Gokturk
    • E21B10/26E21B7/28E21B10/32
    • E21B10/322E21B10/43E21B10/46E21B10/567
    • A reamer for enlarging an underground borehole comprises a plurality of cutter assemblies distributed azimuthally around a longitudinal axis of the tool, and each cutter assembly comprises a supporting structure and a plurality of hard faced cutters (211-216) embedded therein with a hard face of each cutter exposed and facing in a direction of rotation of the tool. Each cutter assembly includes at least one outward-facing gauge surface (220), at a radial distance from the tool axis which aligns the gauge surface with the radially outer extremity (218) of at least one cutter. This gauge surface (220) extends (221) in the direction of rotation circumferentially ahead of the extremity of the exposed face of the aligned at least one cutter. It may meet the side of the assembly at a curved (222) or bevelled (342) edge and may also extend back from the exposed face of the cutter. These gauge surfaces aligned with the extremity of the cutter prevent the reamer from pivoting around the extremity of a cutter which has snagged on the borehole wall and thus stabilise the rotation within the borehole.
    • 用于扩大地下井眼的扩孔器包括围绕工具的纵向轴线方位分布的多个切割器组件,并且每个切割器组件包括支撑结构和多个硬面切割器(211-216),其中嵌入有硬面 每个刀具暴露并面向刀具的旋转方向。 每个切割器组件包括至少一个面向外的计量表面(220),离开工具轴线的径向距离,该距离将计量表面与至少一个切割器的径向外端(218)对准。 该计量表面(220)沿对准的至少一个切割器的暴露表面的末端的周向的圆周方向延伸(221)。 它可以在弯曲(222)或倾斜(342)边缘处遇到组件的侧面,并且还可以从切割器的暴露面向后延伸。 与切割器末端对准的这些测量表面防止铰刀绕着在井眼壁上阻塞的切割器的末端枢转,从而稳定钻孔内的旋转。