Apparatus for electromagnetically coupling power and data signals between a first unit and a second unit and in particular between well bore apparatus and the surface
US4901069A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1989 |
| Grant date | Feb 13, 1990 |
| Priority date | — |
| Expiry date | Feb 14, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S336/02
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
In the representative embodiment of the new and improved apparatus disclosed herein, the apparatus, including a core of a specific material, couples a first unit to a second unit. The first unit may, for example, be a downhole tool, the second unit being surface equipment. The first unit may also be a video recorder or television camera, the second unit being a television monitor. The downhole tool adapted to be coupled in a pipe string and positioned in a well bore is provided with one or more electrical devices cooperatively arranged to receive power from surface power sources or to transmit and/or receive control or data signals from surface equipment. Unique inner and outer coil assemblies arranged on cores of a specific material are arranged on the downhole tool and a suspension cable for electromagnetically coupling the electrical devices to the surface equipment so that power and/or data or control signals can be transmitted between the downhole and surface equipment. The specific material, which comprises the cores of the inner and outer coil assemblies, must have a magnetic permeability greater than that of air and, simultaneously, an electrical resistivity greater than th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.