Rotary drilling bits for directional drilling exhibiting variable weight-on-bit dependent cutting characteristics
US6230828A · kind A · utility
36Cited by
19References
53Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1997 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Sep 8, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1092
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A PDC-equipped rotary drag bit especially suitable for directional drilling. Cutter chamfer size and backrake angle, as well as cutter backrake, may be varied along the bit profile between the center of the bit and the gage to provide a less aggressive center and more aggressive outer region on the bit face to enhance stability while maintaining side cutting capability, as well as providing a high rate of penetration under relatively high weight on bit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.