Volume 20, Issue 1 (March 1997)

    Ultrasonic Method for Evaluation of Annular Seals for Wells and Instrument Holes

    CODEN: GTJOAD

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    Abstract

    An ultrasonic testing method employing the pulse-echo inspection technique was developed to assess the integrity of annular seals surrounding casings (i.e., instrument tubes or well casings). This nondestructive testing method permits testing a seal from inside a casing without disturbing the casing, seal, or formation. Seals constructed with cement-based and bentonite-based sealants surrounding various types and sizes of casings can be evaluated using the method. An evaluation is conducted by sending and receiving ultrasonic waves using a single piezoelectric transducer and commercially available hardware (a pulser receiver and a waveform analyzer). A probe was designed and constructed for downhole testing. Differences in the ultrasonic responses of the materials in contact with a casing are analyzed to determine the presence of different materials (seal or defects filled with air or water in a seal) outside a casing.


    Author Information:

    Yesiller, N
    Assistant professor, Wayne State University, Detroit, MI

    Edil, TB
    Professor and associate professor, University of Wisconsin, Madison, WI

    Benson, CH
    Professor and associate professor, University of Wisconsin, Madison, WI


    Stock #: GTJ11417J

    ISSN: 0149-6115

    DOI: 10.1520/GTJ11417J

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    Author
    Title Ultrasonic Method for Evaluation of Annular Seals for Wells and Instrument Holes
    Symposium , 0000-00-00
    Committee D18