Multi-blade underreamer
US6595302B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 2001 |
| Grant date | Jul 22, 2003 |
| Priority date | — |
| Expiry date | Oct 2, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/322
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An underreamer for forming a cavity within a well bore includes a housing rotatably disposed within the well bore. The underreamer also includes a plurality of cutting blades pivotally coupled to the housing. The underreamer further includes a piston slidably disposed within the housing and adapted to engage the cutting blades. The piston is operable to receive a downwardly disposed force operable slide the piston relative to the housing. The sliding movement of the piston extends the cutting blades outwardly from a retracted position relative to the housing. The underreamer also includes a passage disposed within the piston and operable to communicate a fluid received via an annulus of the housing to the cutting blades.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.