Drill bit and improved cutting element
US4724913A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 18, 1983 |
| Grant date | Feb 16, 1988 |
| Priority date | — |
| Expiry date | Feb 18, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/5673
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drill bit for connection on a drill string has a hollow tubular body with an end cutting face and an exterior peripheral stabilizer surface with cylindrical sintered carbide inserts positioned therein having polycrystalline diamond cutting elements mounted on said inserts. The diamond cutting elements have a novel cutting shape facilitating drilling through hard formations with a minimum of applied weight on the bit. The cutting elements are in the shape of a relatively large disc shaped cutter commonly used for medium and soft formations but have the sides shaped into a cutting edge of substantially smaller radius. The cutting element has the strength and resistance to breakdown of the larger disc but the cutting capacity in hard formations of a smaller diameter cutter. The cutting elements are also disclosed as novel components of the drill.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.