Importance

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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 that of solid iron. By way of example, one such specific material, used in association with the preferred embodiment, is a ferrite material.

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First Claim