Non-rotatable stabilizer and torque reducer
US6032748A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1997 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Jun 6, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/105
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An exemplary stabilizer and torque reducer which will engage a wellbore casing and locate the drill string substantially toward the concentric center of the wellbore casing. The device is capable of being affixed to a drill string at most any location along the string and features a wear sleeve formed of two mateable semicylindrical halves. Malleable bushings are disposed between the wear sleeve and the drill pipe to prevent damage to the drill pipe. The wear sleeve presents an outer wear surface upon which is disposed a stabilizer housing having a plurality of outwardly radially-extending blades adapted to contact a surface such as surrounding wellbore casing. In use, the stabilizer housing is intended to be non-rotatable with respect to the casing when in contact with the casing, but will rotate with respect to the drill string. The housing is of a durable construction having an elastomer jacket with a reinforcing insert within. The presence of the wear sleeve protects the drill pipe from wear which could result from friction due to rotation of the stabilizer housing directly upon the drill pipe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.