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Borehole logging tools and methods using reflected electromagnetic signals

  • US 5,530,359 A
  • Filed: 02/03/1995
  • Issued: 06/25/1996
  • Est. Priority Date: 02/03/1995
  • Status: Expired due to Term
First Claim
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1. A borehole logging tool, comprising:

  • a) a tool body;

    b) a transmitting antenna located in the body;

    c) means for causing the transmitting antenna to transmit an electromagnetic signal;

    d) a receiving antenna, located in the body in an axially spaced relationship from the transmitting antenna, which comprises an array of receiver elements disposed around a longitudinal axis of the tool body; and

    e) means for measuring a difference in signals detected by pairs of elements in the array.

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