Downhole mill and method for milling
US5407011A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 7, 1993 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | Oct 7, 2013 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B29/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A mill assembly having a mill face for milling material in a downhole milling operation is received in a casing or well bore having an internal wall having a first diameter. The mill face has a smaller diameter than the first diameter. The mill face is connected to a shaft assembly including a shaft and a stabilizing assembly for stabilizing the shaft in the casing or the well bore. The stabilizing assembly is connected at one end to the mill face and has a smaller diameter than the first diameter. The stabilizing assembly includes a stem having one or more tapered surfaces, the tapered surfaces tapering from a first diameter to a second diameter larger than the first diameter. The stabilizing assembly further includes a plurality of roller bearings circumferentially arranged in a plane around the stem, each roller bearing being in contact with one of the tapered surfaces at a first point. One of the roller bearings and the stem are moved so that each of the plurality of roller bearings contacts the tapered surface at a second point closer to the second diameter than the first point and is thereby brought into contact with the internal wall of the casing to stabilize the shaft. A m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.