Invention Grant
US07896106B2 Rotary drag bits having a pilot cutter configuraton and method to pre-fracture subterranean formations therewith 有权
旋转拖曳钻头具有先导式切割机配置和方法,以用其预裂开地下地层

  • Patent Title: Rotary drag bits having a pilot cutter configuraton and method to pre-fracture subterranean formations therewith
  • Patent Title (中): 旋转拖曳钻头具有先导式切割机配置和方法,以用其预裂开地下地层
  • Application No.: US11862440
    Application Date: 2007-09-27
  • Publication No.: US07896106B2
    Publication Date: 2011-03-01
  • Inventor: David Gavia
  • Applicant: David Gavia
  • Applicant Address: US TX Houston
  • Assignee: Baker Hughes Incorporated
  • Current Assignee: Baker Hughes Incorporated
  • Current Assignee Address: US TX Houston
  • Agency: TraskBritt
  • Main IPC: E21B10/26
  • IPC: E21B10/26 E21B10/43
Rotary drag bits having a pilot cutter configuraton and method to pre-fracture subterranean formations therewith
Abstract:
A rotary drag bit exhibiting enhanced cutting efficiency and extended life is provided. The rotary drag bit comprises a bit body having a face surface, and a plurality of cutters coupled to the face surface of the bit body. The plurality of cutters comprises at least one pilot cutter and a rotationally trailing larger, primary cutter at substantially the same radius and, optionally of slightly less exposure. The pilot cutter is sized and positioned to pre-fracture the formation and perform an initial cut, while the primary cutter removes weakened, remaining formation material along the same rotational path. A method to pre-fracture subterranean formations using a rotary drag bit having a pilot cutter configuration is also provided.
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