CPC G01V 1/50 (2013.01) [G01V 2210/74 (2013.01)] | 17 Claims |
1. A method of determining well integrity, comprising:
exciting a cased hole configured with double casing with at least one sonic source, wherein the double casing comprises an inner casing and an outer casing;
acquiring signals with a plurality of receiving element arrays situated at a plurality of azimuthal sectors in a vicinity of the at least one sonic source;
processing the acquired signals with the plurality of receiving element arrays;
examining the processed signals for arrivals and determining whether the arrivals exhibit uniform or non-uniform signatures across all azimuths;
processing the acquired signals to obtain slowness-time-coherence (STC) signatures for specific arrivals;
examining the STC signatures and determining whether the specific arrivals exhibit the uniform or non-uniform signatures across all azimuths;
examining multiplicity of an STC signature of a specific arrival along a slowness range of interest; and
deriving a map based on the signatures reflecting azimuthal coverage of contents of an annular space outside of the outer casing.
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