Drill bit assembly for directional drilling
US7360610B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Jan 18, 2006 |
| Grant date | Apr 22, 2008 |
| Priority date | — |
| Expiry date | Nov 25, 2026 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/62
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In one aspect of the invention a drill bit assembly has a body portion intermediate a shank portion and a working portion, the working portion having at least one cutting element. A shaft is supported by the body portion and extends beyond the working portion. The shaft also has a distal end that is rotationally isolated from the body portion. In another aspect of the invention, a method for steering a downhole tool string has the following steps: providing a drill bit assembly attached to an end of the tool string disposed within a bore hole; providing a shaft extending beyond a working portion of the assembly; engaging a subterranean formation with a distal end of the shaft; and angling the drill bit assembly with the shaft along a desired drilling trajectory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.