Directional casing drilling
US7004263B2 · kind B2 · utility
27Cited by
27References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2003 |
| Grant date | Feb 28, 2006 |
| Priority date | — |
| Expiry date | Apr 13, 2024 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1014
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A directional casing drilling system including a casing string for rotation of a drill bit, a shaft coupled to the casing string, and a sleeve having pads that are hydraulically extensible. The sleeve may be positioned about a portion of the shaft. The invention may also include a tube connecting the sleeve to the drill collar, the tube adapted to conduct drilling fluid, and a valve system adapted to operatively conduct at least a portion of the drilling fluid to the pads whereby the pads move between an extended position and a retracted position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.