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Apparatuses and methods for at-bit resistivity measurements for an earth-boring drilling tool

  • US 10,006,283 B2
  • Filed: 07/13/2016
  • Issued: 06/26/2018
  • Est. Priority Date: 04/11/2012
  • Status: Active Grant
First Claim
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1. An earth-boring drilling tool, comprising:

  • a body having at least one blade;

    a cutting element secured to the at least one blade, the cutting element comprising;

    a cutting element body having a cutting surface thereon; and

    at least one sensor disposed within the cutting element body and having at least one exposed surface, wherein the at least one sensor includes;

    a first pair of electrodes coupled to a voltage source, anda second pair of electrodes coupled to a current source; and

    control circuitry operably coupled with the at least one sensor of the cutting element, and configured to;

    energize the at least one sensor to cause a current to flow through an earth formation in contact with the cutting element; and

    measure the current through the first pair of electrodes and measure a voltage through the second pair of electrodes to determine a resistivity of the earth formation responsive to the current.

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