Hydraulically locking stabilizer
US8082987B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 1, 2009 |
| Grant date | Dec 27, 2011 |
| Priority date | — |
| Expiry date | Jun 22, 2030 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A downhole tool includes a pressure housing deployed in the bore of a drill collar. At least three fins are deployed on the housing and in the tool annulus. At least one of the fins includes a floating blade deployed thereon. The blade includes a plurality of radial pistons deployed therein. The pistons are configured such that the surface area of the radially outward facing piston surfaces is greater than the surface area of the radially inward facing piston surfaces. This piston configuration causes the surface area of the radially outward facing blade surface to be less than the radially inward facing blade surface. In operation, hydrostatic pressure exerts a differential force on the pistons and the floating blade thereby urging the pistons radially inward towards the housing and the blade radially outward towards the drill collar.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.