G - Physics – 01 – S
Patent
G - Physics
01
S
349/14, 349/4, 3
G01S 15/93 (2006.01) E21B 47/08 (2006.01) G01N 29/07 (2006.01) G01N 29/11 (2006.01) G01N 29/34 (2006.01) G01N 29/42 (2006.01) G01N 29/44 (2006.01) G01N 29/46 (2006.01) G01S 7/00 (2006.01) G01S 7/526 (2006.01) G01S 15/06 (2006.01) G01S 15/88 (2006.01) E21B 41/00 (2006.01)
Patent
CA 1314970
ABSTRACT OF THE DISCLOSURE An acoustic transducer having a curved surface to match the inner or outer surfaces of a target surface such as a cylindrical borehole tubular is disclosed. A sequence of excitation pulses causes the transducer to launch a series of high- frequency, short duration acoustic energy pulses toward the tubular. The characteristics of the tubular surfaces, including the location, area and depth of any corrosion pits on the tubular surfaces, are determined from a full echo waveform. A rule-based Expert System analyzes the full waveform of the echo pulses returned from the tubular to determine the most likely characteris- tics of the surfaces which produced the full echo waveform. More specifically, the Expert System uses expertise about the acoustic properties of the target medium, as well as constraints chosen by an expert, to determine which signal structures are informational and which signal structures are confounding, The present invention also involves preprocessing and transmitting information. The present invention reduces the absolute amount of information that is transmitted without reducing the amount of meaningful information that is conveyed. The present invention transmits more meaningful information than conventional transmission systems. It also reduces the amount of information processing at the destination. A41.1.WP
582094
Cobb Wesley N.
Gowling Lafleur Henderson Llp
The Standard Oil Company
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