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Method and apparatus for transmitting information relating to the operation of a downhole electrical device

  • US 5,521,592 A
  • Filed: 07/20/1994
  • Issued: 05/28/1996
  • Est. Priority Date: 07/27/1993
  • Status: Expired due to Term
First Claim
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1. A method of transmitting information relating to the operation of an electrical device disposed in a borehole, wherein said electrical device is supplied power by means of an electrical power cable which is connected to a power supply located at the earth'"'"'s surface, comprising the steps of:

  • detecting information by means of at least one downhole sensor;

    transmitting said information to said power cable by inductive coupling at a downhole location;

    receiving said information at the surface by inductive coupling; and

    processing said information at the surfacewherein said device is electrically powered via a three-phase wire connection, wherein inductive coupling is associated with each of the wires corresponding to a respective phase, and wherein the couplers are disposed in such a manner that the total magnetic flux is zero when the assembly is in a state of electrical equilibrium.

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