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Magnetic field sensing tool with magnetic flux concentrating blocks

  • US 9,354,350 B2
  • Filed: 05/23/2012
  • Issued: 05/31/2016
  • Est. Priority Date: 05/23/2012
  • Status: Expired due to Fees
First Claim
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1. A downhole magnetic field sensing tool comprising:

  • a rotatable cylindrical tubular member having an internal bore formed therethrough;

    a first magnetic field sensor having a first measurement axis, a second magnetic field sensor having a second measurement axis and a third magnetic field sensor having a third measurement axis, each magnetic field sensor disposed within the internal bore of the rotatable cylindrical tubular member, wherein the first measurement axis, the second measurement axis, and the third measurement axis each makes an angle with a central axis of the rotatable cylindrical tubular member and the first measurement axis is arranged at a non-zero angle relative to the second measurement axis, each magnetic field sensor employing a magnetically permeable core, the magnetically permeable core having a first axial end and a second axial end;

    a first magnetic flux concentrating block and a second magnetic flux concentrating block wherein the first magnetic flux concentrating block is disposed within the internal bore at the first axial end of the magnetically permeable core of each magnetic field sensor, and the second magnetic flux concentrating block is disposed within the internal bore at the second axial end of the magnetically permeable core of each magnetic field sensor; and

    an electronics unit operatively and communicatively connected to each magnetic field sensor.

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