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Inductive cavity sensors for resistivity tools

  • US 10,641,087 B2
  • Filed: 10/28/2015
  • Issued: 05/05/2020
  • Est. Priority Date: 10/28/2015
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a conductive tool body comprising;

    a first transmitter comprising;

    a first transmitter annular cavity that encircles the conductive tool body,a first transmitter surface gap that encircles the conductive tool body and electromagnetically couples the first transmitter annular cavity to an external surface of the conductive tool body, anda first transmitter ring of high magnetic permeability material in the first transmitter annular cavity;

    a first receiver comprising;

    a first receiver annular cavity,a first receiver surface gap that electromagnetically couples the external surface of the conductive tool body to the first receiver annular cavity, anda first high magnetic permeability material in the first receiver annular cavity;

    a first transmitter module coupled to opposite sides of the first transmitter surface gap to induce an electric current around the first transmitter annular cavity; and

    a first receiver module coupled to opposite sides of the first receiver surface gap to detect currents induced around the first receiver annular cavity.

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