Pantograph underreamer
US6575255B1 · kind B1 · utility
47Cited by
61References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 13, 2001 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Aug 13, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1021
- 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 a sleeve slidably positioned around the housing. The underreamer may further include at least one cutter set where each cutter set is pivotally coupled to the housing and the sleeve. An axial force applied to the sleeve operates to slide the sleeve relative to the housing and extend each cutter set 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.