Cement Evaluation - Cement Bond Log Interpretation
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
VDL shows clear “w” pattern at collars