公开(公告)号：US06443246B1

公开(公告)日：2002-09-03

申请号：US09704847

申请日：2000-11-02

申请人： Rudolf Carl Otto Pessier ,  Brian Christopher Wiesner ,  George Edward Dolezal ,  Matthew Ray Isbell ,  James Lawrence Jacobsen ,  Brian Andrew Baker

发明人： Rudolf Carl Otto Pessier ,  Brian Christopher Wiesner ,  George Edward Dolezal ,  Matthew Ray Isbell ,  James Lawrence Jacobsen ,  Brian Andrew Baker

IPC分类号： E21B1016

CPC分类号： E21B10/16

摘要： An earth-boring bit for attachment to a drill string has rotatable cones with rows of cutting elements. The cutting elements are arranged in generally circumferential rows on each of the cones and interference fit into apertures in the shell surface. The rows include a heel row of cutting elements on the heel surface of each of the cones, and an adjacent row of adjacent row cutting elements next to the heel row cutting elements. Each heel row cutting element has at least one counterpart adjacent row cutting element that is spaced no farther from it than any other adjacent row cutting element, defining a proximal pair. Each of the cutting elements in each of the proximal pairs has a grip ratio, which is the barrel length divided by the diameter. Some of the proximal pairs having cutting elements with higher grip ratios than other cutting elements. None of the proximal pairs has both cutting elements with higher grip ratios.

摘要翻译： 用于附接到钻柱的钻孔可以具有切割元件行的可旋转锥体。 切割元件在每个锥形体上以大致圆周排布置，并且过盈配合到壳表面中的孔中。 这些行包括在每个锥体的跟部表面上的跟随行切割元件，以及邻近的后排行切割元件的相邻行切割元件的相邻行。 每个后跟行切割元件具有至少一个与行切割元件相邻的对应部分，其与任何其它相邻的行切割元件间隔开距离它不限于近侧对。 每个近端对中的每个切割元件具有握持比，其是筒长度除以直径。 近端对中的一些具有比其它切割元件更高的抓握比的切割元件。 近侧对中没有一个具有较高握持比的切割元件。

公开(公告)号：US5695018A

公开(公告)日：1997-12-09

申请号：US527818

申请日：1995-09-13

申请人： Rudolf Carl Otto Pessier ,  Matthew Ray Isbell

发明人： Rudolf Carl Otto Pessier ,  Matthew Ray Isbell

IPC分类号： E21B10/16 ,  E21B17/10 ,  F21B9/36

CPC分类号： E21B17/1092 ,  E21B10/16

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 gage surface and an adjacent cutter backface. The cutter has negative offset with respect to the axis and direction of rotation of the bit. A plurality of cutting elements are arranged on the cutter including a plurality of gage cutting elements on the gage surface of the cutter. At least one of the gage cutting elements projects beyond the gage surface and defines a cutting surface facing the backface of the cutter for engaging the sidewall of the borehole being drilled as the gage cutting element moves up the sidewall.

摘要翻译： 钻头具有一定体积，至少有一个悬臂轴承轴从钻头体向内和向下偏移。 安装刀具用于在轴承轴上旋转并且包括量规表面和相邻的刀具背面。 刀具相对于钻头的轴线和旋转方向具有负偏移。 多个切割元件布置在切割器上，其包括多个切割元件，位于切割器的表面上。 至少一个量规切割元件突出超过计量表面并且限定面向切割器背面的切割表面，用于接合正在钻孔的钻孔的侧壁，因为计量切割元件向上移动侧壁。