Offset rock bit with pull back adapter
US8544569B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 22, 2012 |
| Grant date | Oct 1, 2013 |
| Priority date | — |
| Expiry date | Feb 22, 2032 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/046
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An offset rock bit (12) has a steering face (28) and a shoe (30) provided by a recess formed into the steering face (28). A slot (66) formed into the shoe (30) for receiving a pull back adapter (50) in a centrally located position in the forward end of the offset rock bit (12). The pull back 5 adapter (50) has a pull back eye (52) with a central axis (62) which is aligned with a centrally disposed longitudinal axis (20) of the offset rock bit (12) and the tool string (10). This aligns the pull back eye (52) of the pull back adapter (50) with a borehole formed using the offset rock bit (12). The pull back adapter (50) also includes side edges (54, 56) which are configured for centering the pull back adapter (50) and pull back conduit within the borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.