Rotator for wireline conveyed wellbore instruments and method for rotating an instrument in a wellbore
US7841403B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 8, 2008 |
| Grant date | Nov 30, 2010 |
| Priority date | — |
| Expiry date | May 8, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/01
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for rotating an instrument in a wellbore includes a non magnetic housing configured to traverse the interior of the wellbore. The housing has an external diameter smaller than an internal diameter of a casing disposed in the wellbore. A plurality of electromagnets is arranged circumferentially about the interior of the housing and is configured to induce magnetic flux through a wall of the housing when actuated. A controller configured to sequentially rotationally actuate the electromagnets. A method for rotating a wellbore instrument in a wellbore includes causing parts of an instrument housing to be sequentially rotationally magnetically attracted to a casing disposed in the wellbore. The housing has a smaller external diameter than an internal diameter of the casing. The sequential rotational magnetic attraction is continued as needed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.