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The Mode Experiments on Evaluation of the Bond BetweenCement Annulus and Formation with Ultrasonic Echo Technique

Qiao,W. X.et al.  
Mode experiemnts have been made to verify the possiblity of determining thecement bond quality between cement annulus and formation with ultrasonic echotechnique. The experimental results show,whether in time domain or in frequencydomain, there is no obvious characteristics in acoustic signal against the interfacebetween cement annulus and formation.The calculated reflectivity is in good agreement with the measured one. So, there may be no likelihood to determine the cement bond quality of the interface only by ultrasonic echo technique.
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