发明名称 |
Pointed Diamond Working Ends on a Shear Bit |
摘要 |
In one aspect of the present invention, a drill string has a drill bit with a body intermediate a shank and a working face. The working face has a plurality of blades converging at a center of the working surface and diverging towards a gauge of the working face. 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 also has a central axis which intersects an apex of the pointed geometry. The axis is oriented between a 25 and 85 degree positive rake angle.
|
申请公布号 |
US2008035380(A1) |
申请公布日期 |
2008.02.14 |
申请号 |
US20070829577 |
申请日期 |
2007.07.27 |
申请人 |
HALL DAVID R;CROCKETT RONALD;BAILEY JOHN |
发明人 |
HALL DAVID R.;CROCKETT RONALD;BAILEY JOHN |
分类号 |
E21B10/46 |
主分类号 |
E21B10/46 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|