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Method and apparatus for interface location determination

  • US 4,831,331 A
  • Filed: 04/10/1987
  • Issued: 05/16/1989
  • Est. Priority Date: 04/10/1987
  • Status: Expired due to Fees
First Claim
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1. A method of determining the location of an interface of dielectrically different material comprising the steps of:

  • (a) transmitting electromagnetic radiation from a first transmitting antenna and a second transmitting antenna in a wellbore, the radiation from the first transmitting antenna and the second transmitting antenna having a common phase and amplitude, said first transmitting antenna located above said second transmitting antenna;

    (b) receiving a sum signal resultant from the step (a) at a receiving antenna located between said first transmitting antenna and said second transmitting antenna;

    (c) transmitting electromagnetic radiation from the first transmitting and the second transmitting antennas, the transmitted radiation from the first and second antennas having a common amplitude and phases differing by 180? ;

    (d) receiving a delta signal resultant from step (c) at said receiving antenna;

    (e) moving said antennas across the interface; and

    (f) monitoring said sum and said delta signals for changes whereby the interface can be detected.

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