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Microresistivity anisotropy logging tool employing a monopole current injection electrode

  • US 8,581,594 B2
  • Filed: 12/30/2009
  • Issued: 11/12/2013
  • Est. Priority Date: 12/30/2009
  • Status: Expired due to Fees
First Claim
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1. downhole microresistivity logging tool comprising:

  • a logging tool body;

    a monopole current injection electrode configured to inject alternating electrical current into a formation;

    a return electrode, the return electrode providine a return path for the electrical current injected by the monopole current injection electrode, the return electrode deployed in the tool body and spaced apart from the monopole current injection electrode;

    a first pair of potential electrodes spaced apart from the monopole current injection electrode in a first direction;

    a second pair of potential electrodes spaced apart from the monopole current injection electrode in a second direction; and

    a controller configured to (i) apply an alternating current between the monopole current injection electrode and the return electrode and (ii) measure first and second potential differences between the corresponding first and second pairs of potential electrodes.

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