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Cement Bond Log
The sonic tool may be used to assess the condition of the cement/grout bond around steel lining. Where the lining is completely free and unbonded the received sonic signals are of a high (100%) amplitude with signals arriving early.
In steel lining that is bonded the received sonic signal is highly attenuated due to energy loss through the grout into the formation.
In this case the amplitudes of the first arrivals are low, the lower the amplitudes the better the bonding. Under good bonding conditions these early lines of the VDL are faint, light coloured or non-existent.
