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Method and apparatus to detect a conductive body

  • US 9,810,805 B2
  • Filed: 08/03/2011
  • Issued: 11/07/2017
  • Est. Priority Date: 08/03/2011
  • Status: Active Grant
First Claim
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1. A method comprising:

  • generating a probe signal into a formation below the earth'"'"'s surface from a transmitting sensor of a tool disposed below the earth'"'"'s surface;

    receiving voltage signals in receiving sensors of the tool in response to generating the probe signal, the receiving sensors arranged in pairs to substantially cancel a magnetic field of a primary signal associated with the probe signal without rotating the receiving sensors to cancel the magnetic field of the primary signal and to capture a magnetic field of a secondary signal generated from a conductive body being a structure other than the formation and the tool, wherein the receiving sensors include two tilted sensors such that the two tilted sensors are arranged non-perpendicular to a longitudinal axis of the tool and oriented; and

    determining an azimuthal angle associated with the conductive body using the voltage signals and a distance to the conductive body determined using a magnitude of the voltages signals, formation resistivity, and dielectric constant.

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