Cased hole

Acoustic cement-bond-log (CBL / AKC) interpretation — amplitude metrics, casing- and formation-bond classification and a final cement-quality verdict for fracking and squeeze-work planning.

Amplitude metrics

• Amplitude metrics computation — normalised amplitudes used by the classifiers.
• BOND index — the bond-quality index derived from the acoustic response.

Casing-bond classification

• Classification by BOND index.
• Classification by transit time (TT).
• Classification by amplitude metrics.

Formation-bond classification

• Basic cement-to-formation bond classification.
• Refined cement-to-formation bond classification.

Sector analysis and final verdict

• Cement-defect classification from sector acoustic data.
• Consolidated casing-bond flag combining the individual classifiers.
• Final cement quality cutoff — the flag used for completion and squeeze planning.

This page summarises the CBL section of the Wellbore.AI / Gamma technical manual.

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