Drill string stabilizer
US4844179A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1987 |
| Grant date | Jul 4, 1989 |
| Priority date | — |
| Expiry date | Aug 24, 2007 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B17/1078
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A stabilizer sleeve (7) for a drill string, adapted to fit about a down hole motor (1) or a drill string member, is formed with an internally threaded coupling at a lower end for releasable coupling to complimentary threads (8) formed on an upwardly extending intermediate coupling portion (15) of a bottom coupling-nut (3). The coupling-nut (3) is provided with a lower end portion (14) of larger diameter and an upper coupling portion (16) of reduced diameter. The upper coupling portion (16) is conventionally formed with an upwardly tapering form and right-hand thread whereas the intermediate coupling portion (15) is formed with a left-hand thread. The stabilizer sleeve (7) fits about the motor (1) or other body member and above the coupling-nut (3) so that the sleeve (7) may be removed upwardly from the coupling-nut (3).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.