发明申请
- 专利标题: Rotary Drag Bit with Pointed Cutting Elements
- 专利标题(中): 旋转拖动位与点切割元素
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申请号: US11766975申请日: 2007-06-22
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公开(公告)号: US20080314647A1公开(公告)日: 2008-12-25
- 发明人: David R. Hall , Ronald Crockett , John Bailey
- 申请人: David R. Hall , Ronald Crockett , John Bailey
- 主分类号: E21B10/46
- IPC分类号: E21B10/46
摘要:
In one aspect of the invention a rotary drag bit has a bit body intermediate a shank and a working surface. The working surface has a plurality of blades converging at a center of the working surface and diverging towards a gauge of the working surface. At least one blade has a cutting element with a carbide substrate bonded to a diamond working end with a pointed geometry. The diamond working end has a central axis which intersects an apex of the pointed geometry such that the axis is oriented within a 15 degree rake angle.
公开/授权文献
- US08122980B2 Rotary drag bit with pointed cutting elements 公开/授权日:2012-02-28
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