FIELD: geophysics.
SUBSTANCE: method includes measuring amplitudes of longitudinal acoustic wave on two working emitted frequencies of signal along casing column within given range. Amplitudes of longitudinal wave of acoustic signal are recorded along column at two frequencies (high Ahf and low Alf) and on basis of relation of these values, normalized by maximal values at portion of non-cemented column Avr (Ahf/Avr and Alf/Avr), separation of cementation defects by major types is performed (ring space, volumetric defect, mixed defect) and values of their openness are measured.
EFFECT: higher trustworthiness and higher precision.
2 dwg
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