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Measurements of electrical properties through non magneticially permeable metals using directed magnetic beams and magnetic lenses

  • US 6,630,831 B2
  • Filed: 09/04/2001
  • Issued: 10/07/2003
  • Est. Priority Date: 09/02/2000
  • Status: Expired due to Fees
First Claim
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1. The method of focusing or lensing an oscillating magnetic flux to measure the electrical resistivity of media within a geologic formation surrounding a cased well bore comprising the steps of:

  • (1) generating at least one magnetic flux proximate to a non-magnetically permeable section of a casing;

    (2) oscillating the magnetic flux at least at one frequency suitable to pass through the segment of the well casing for entering a surrounding geological formation such that the flux engages with electrically conductive media contained within the surrounding formation to create eddy currents within the media;

    (3) inducing a separate oscillating magnetic flux created by the eddy currents in the electrically conductive media within the formation such that a field of the induced magnetic flux extends back to the well casing;

    (4) receiving, from within the casing, the induced magnetic flux of the geologic formation;

    (5) converting the induced flux into electrical signals that are filtered and processed;

    (6) determining the electrical resistivity of the media located in the geologic formation proximate to the well casing based on the electrical signals; and

    (7) determining the characteristics of the media located in the geologic formation proximate to the well casing by evaluating the electrical resistivity.

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