CPC E21B 47/005 (2020.05) [G01N 29/041 (2013.01); G01N 29/09 (2013.01); E21B 33/14 (2013.01); G01N 2291/2636 (2013.01)] | 10 Claims |
1. A method of identifying a micro-annulus outside a casing in a cemented wellbore, the method comprising:
transmitting an acoustic pulse incident on the casing;
making a measurement of a first acoustic impedance value from pulse-echo information generated responsive to an echo of the acoustic pulse reflected from the casing;
propagating a circumferential acoustic wave in the casing;
making a measurement of a second acoustic impedance value from propagating wave information generated responsive to the propagating acoustic wave; and
determining from the first acoustic impedance value and the second acoustic impedance value a presence of a micro-annulus between the casing and the cement.
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