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    Rotary drill bits employing tandem gage pad arrangement
    1.
    发明授权
    Rotary drill bits employing tandem gage pad arrangement 失效
    旋转钻头采用串联量具垫排列

    公开(公告)号：US6112836A

    公开(公告)日：2000-09-05

    申请号：US924935

    申请日：1997-09-08

    申请人： John R. Spaar ,  James A. Norris ,  Christopher C. Beuershausen ,  Rudolf C. O. Pessier ,  Michael P. Ohanian ,  Roland Illerhaus ,  Jeffrey B. Lund ,  Michael L. Doster

    发明人： John R. Spaar ,  James A. Norris ,  Christopher C. Beuershausen ,  Rudolf C. O. Pessier ,  Michael P. Ohanian ,  Roland Illerhaus ,  Jeffrey B. Lund ,  Michael L. Doster

    IPC分类号： E21B7/08 ,  E21B10/46 ,  E21B17/10

    CPC分类号： E21B17/1092 ,  E21B10/46

    摘要： A rotary drag bit being suitable for directional drilling. The bit includes a bit body from which extend radially-oriented blades carrying PDC cutters. The blades extend to primary gage pads, above which secondary gage pads are either longitudinally spaced or rotationally spaced, or both, defining a gap or discontinuity between the primary and secondary gage pads through which drilling fluid from adjacent junk slots may communicate laterally or circumferentially. Longitudinally leading edges of the secondary gage pads may carry cutters for smoothing the sidewall of the borehole. The tandem primary and secondary gage pads provide enhanced bit stability and reduced side cutting tendencies. The discontinuities between the primary and secondary gage pads enhance fluid flow from the bit face to the borehole annulus above the bit, promoting formation cuttings removal. The tandem gage arrangement also has utility in conventional bits not designed specifically for directional drilling.

    摘要翻译： 旋转拖曳钻头适用于定向钻孔。 该钻头包括一个承载PDC切割器的径向定向刀片的位体。 叶片延伸到主量规焊盘，在其上方，二次量规焊盘沿纵向间隔开或旋转间隔开，或两者限定了初级和次级量规焊盘之间的间隙或不连续性，通过该间隙或不连续性，来自相邻垃圾槽的钻井液体可横向或周向地连通。 二次测量垫的纵向前缘可携带用于使钻孔侧壁平滑的切割器。 串联一次和二次测量垫提供增强的位稳定性和减少的侧切倾向。 主和二次测量垫之间的不连续性增强了从钻头面到钻头上方的钻孔环之间的流体流动，促进了去除切屑。 串联量规布置也可用于不专门用于定向钻孔的常规钻头中。

    Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability
    2.
    发明授权
    Rotary drill bits for directional drilling employing tandem gage pad arrangement with cutting elements and up-drill capability 失效
    用于定向钻孔的旋转钻头，采用具有切割元件和上钻能力的串联量规垫

    公开(公告)号：US06321862B1

    公开(公告)日：2001-11-27

    申请号：US09129302

    申请日：1998-08-05

    申请人： Christopher C. Beuershausen ,  Robert J. Costo, Jr. ,  Danny E. Scott ,  Rudolf C. O. Pessier ,  Roland Illerhaus ,  Mark W. Dykstra ,  James A. Norris ,  Michael P. Ohanian ,  John R. Spaar

    发明人： Christopher C. Beuershausen ,  Robert J. Costo, Jr. ,  Danny E. Scott ,  Rudolf C. O. Pessier ,  Roland Illerhaus ,  Mark W. Dykstra ,  James A. Norris ,  Michael P. Ohanian ,  John R. Spaar

    IPC分类号： E21B1026

    CPC分类号： E21B17/1092 ,  E21B10/46

    摘要： A rotary drag bit suitable for directional drilling. The bit includes a bit body from which extend radially-oriented blades carrying PDC cutters. The blades extend to primary gage pads, above which secondary gage pads are either longitudinally spaced or rotationally spaced, or both, defining a gap or discontinuity between the primary and secondary gage pads through which drilling fluid from adjacent junk slots may communicate laterally or circumferentially. Longitudinally leading edges of the secondary gage pads carry cutters for smoothing the sidewall of the borehole. The cutters are preferably configured and oriented so as to provide a relatively aggressive cutting edge to the formation in both longitudinal and rotational directions of bit movement, the cutting edges lying adjacent cutting surfaces preferably disposed at negative rake angles to the formation material of the borehole wall for enhanced durability. Cutters may likewise be disposed on the trailing ends of the secondary gage pads to provide an up-drill capability to facilitate removal of the bit from the borehole. The tandem primary and secondary gage pads provide enhanced bit stability and reduced side cutting tendencies. The discontinuities between the primary and secondary gage pads enhance fluid flow from the bit face to the borehole annulus above the bit, promoting formation cuttings removal. The tandem gage arrangement also has utility in conventional bits not designed specifically for directional drilling.

    摘要翻译： 适用于定向钻孔的旋转牵引钻头。 该钻头包括一个承载PDC切割器的径向定向刀片的位体。 叶片延伸到主量规焊盘，在其上方，二次量规焊盘沿纵向间隔开或旋转间隔开，或两者限定了初级和次级量规焊盘之间的间隙或不连续性，通过该间隙或不连续性，来自相邻垃圾槽的钻井液体可横向或周向地连通。 二次测量垫的纵向前缘带有切割器，用于平滑钻孔的侧壁。 切割器优选地构造和定向成在钻头移动的纵向和旋转方向上向地层提供相对侵蚀性的切割边缘，切割边缘位于切割表面附近，优选地设置成与钻孔壁的形成材料成负向的前角 以提高耐久性。 切割器同样可以设置在二次量规焊盘的尾端上，以提供上钻能力以便于从钻孔中移除钻头。 串联一次和二次测量垫提供增强的位稳定性和减少的侧切倾向。 主和二次测量垫之间的不连续性增强了从钻头面到钻头上方的钻孔环之间的流体流动，促进了去除切屑。 串联量规布置也可用于不专门用于定向钻孔的常规钻头中。

    Rotary drill bits for directional drilling employing tandem gage pad arrangement with reaming capability
    3.
    发明授权
    Rotary drill bits for directional drilling employing tandem gage pad arrangement with reaming capability 失效
    用于定向钻孔的旋转钻头，采用具有铰孔能力的串联计量垫排列

    公开(公告)号：US6006845A

    公开(公告)日：1999-12-28

    申请号：US925284

    申请日：1997-09-08

    申请人： Roland Illerhaus ,  Christopher C. Beuershausen ,  Mark W. Dykstra ,  James A. Norris ,  Michael P. Ohanian ,  Rudolf C. O. Pessier ,  John R. Spaar

    发明人： Roland Illerhaus ,  Christopher C. Beuershausen ,  Mark W. Dykstra ,  James A. Norris ,  Michael P. Ohanian ,  Rudolf C. O. Pessier ,  John R. Spaar

    IPC分类号： E21B10/46 ,  E21B17/10 ,  E21B10/26

    CPC分类号： E21B17/1092 ,  E21B10/46

    摘要： A rotary drag bit being suitable for directional drilling. The bit includes a bit body from which extend radially-oriented blades carrying PDC cutters. The blades extend to primary gage pads, above which secondary gage pads are either longitudinally spaced or rotationally spaced, or both, defining a gap or discontinuity between the primary and secondary gage pads through which drilling fluid from adjacent junk slots may communicate laterally or circumferentially. Longitudinally leading edges of the secondary gage pads carry cutters for smoothing the sidewall of the borehole. The tandem primary and secondary gage pads provide enhanced bit stability and reduced side cutting tendencies. The discontinuities between the primary and secondary gage pads enhance fluid flow from the bit face to the borehole annulus above the bit, promoting formation cuttings removal. The tandem gage arrangement also has utility in conventional bits not designed specifically for directional drilling.

    摘要翻译： 旋转拖曳钻头适用于定向钻孔。 该钻头包括一个承载PDC切割器的径向定向刀片的位体。 叶片延伸到主量规焊盘，在其上方，二次量规焊盘沿纵向间隔开或旋转间隔开，或两者限定了初级和次级量规焊盘之间的间隙或不连续性，通过该间隙或不连续性，来自相邻垃圾槽的钻井液体可横向或周向地连通。 二次测量垫的纵向前缘带有切割器，用于平滑钻孔的侧壁。 串联一次和二次测量垫提供增强的位稳定性和减少的侧切倾向。 主和二次测量垫之间的不连续性增强了从钻头面到钻头上方的钻孔环之间的流体流动，促进了去除切屑。 串联量规布置也可用于不专门用于定向钻孔的常规钻头中。