This article presents the key elements for Cement Bond Log Interpretation (free pipe, good bond, hard formation, micro annulus)   Free Pipe Free Pipe is characterised by the following: CBL / VDL CET High CBL readings > 50% White on log Parallel lines on VDL vs. Depth CSMX* & CSMN* are zero Weak formation signals … Cement Evaluation – Cement Bond Log Interpretation

This article describes how Cement Bond Logs are used to interpret the quality of the cement bond. The Cement Bond Logs (CBL) gives a continuous measurement of the amplitude of the first casing arrival at a receiver spaced 3 ft from an acoustic transmitter. The amplitude is a maximum in unsupported pipe, and a minimum for … Cement Evaluation – Cement Bond Logs (CBL)