PEAK ANALYSIS OF ULTRASONIC WAVEFORMS FOR CEMENT BOND LOGGING

A cement bond log from recorded ultrasonic waveforms, a method for evaluating bonding of cement in a wellbore between a casing and a wellbore wall, and a method for creating a cement bond log from recorded ultrasonic waveforms are disclosed, in which series of points corresponding to maxima and minima of the waveforms are identified. Absolute value amplitudes of the series of points are thereafter identified and a correlation thereof is analyzed to divide each series of points into four or more zones, corresponding to casing arrival data, inner and outer annular data, wellbore wall arrival data, respectively. Mean values of the absolute value amplitudes of the waveforms for points of each series falling within each of the four zones are calculated, which relate to cement bonding at the depths of the recorded ultrasonic waveforms.