Earth-boring tools attachable to a casing string and methods for their manufacture
US9085939B2 · kind B2 · utility
2Cited by
12References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2008 |
| Grant date | Jul 21, 2015 |
| Priority date | — |
| Expiry date | Aug 8, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49966
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Casing bits include a bit crown having a substantially hollow interior. The bit crown has blades over a face portion thereof, the blades including a plurality of cutting elements attached thereto. The bit crown further includes a composite inlay positioned at least within the substantially hollow interior. The casing bits also include case hardened outer surfaces radially outside a drill-out region. The casing bits further include short-substrate cutting elements. Methods of forming a casing bit are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.