Earth boring drill bits with casing component drill out capability and methods of use
US7624818B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 2005 |
| Grant date | Dec 1, 2009 |
| Priority date | — |
| Expiry date | Feb 26, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A drill bit includes a bit body having a face on which two different types of cutting elements are disposed, the first type being cutting elements for drilling at least one subterranean formation and the second type being cutting elements for drilling through a casing bit disposed at an end of a casing or liner string and cementing equipment or other components. The second type of cutting elements exhibits a relatively greater exposure than the first type of cutting elements, so as to engage the interior of the casing bit and, if present, cementing equipment components and cement to drill therethrough, after which the second type of cutting elements quickly wears upon engagement with the subterranean formation material exterior to the casing bit, and the first type of cutting elements continues to drill the subterranean formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.