Method and apparatus for inspecting well bore casing

  • US 5,717,169 A
  • Filed: 08/26/1996
  • Issued: 02/10/1998
  • Est. Priority Date: 10/13/1994
  • Status: Expired due to Term
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First Claim
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1. Apparatus for investigating a fluid-containing generally cylindrical casing in an earth borehole, comprising:

  • an ultrasonic transducer assembly for transmitting ultrasonic energy through said fluid to said casing and for receiving ultrasonic energy representative of echoes reflected from said casing;

    said ultrasonic transducer assembly including means for focusing the transmitted ultrasonic energy at the inner surface of the casing, said ultrasound being focused with a focusing cone of f/3 or higher f-number; and

    means for determining the casing thickness from the received echoes.

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