Rotary drill bits for directional drilling exhibiting variable weight-on-bit dependent cutting characteristics
US6443249B2 · kind B2 · utility
27Cited by
19References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 14, 2001 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | May 14, 2021 |
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.