Methods of casing drilling
US7182153B2 · kind B2 · utility
4Cited by
26References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 9, 2004 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Apr 1, 2024 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/068
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides a method and apparatus for casing while drilling without the use of an underreamer. In one aspect, the invention provides a flexible drill collar that enables drilling of a large enough borehole for passage of the casing string therethrough.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.