Pantograph underreamer
US6644422B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2001 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Aug 13, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/32
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An underreamer for forming a cavity within a well bore is provided. The underreamer may include a housing rotatably disposed within the well bore. The underreamer may also include an actuation rod slidably positioned in the housing. The underreamer may further include a plurality of cutter sets where each cutter set is pivotally coupled to the housing and the actuation rod. The cutter sets are also pivotally coupled together. An axial force applied to the actuation rod operates to slide the actuation rod relative to the housing and extend the cutter sets from a retracted position radially outward relative to the housing to form the cavity when the housing is rotated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.