...
By checking the temperature difference one can assess how high the cement has gone up behind the casing.
This is the cheapest method to check the target interval was cemented, but it can not qualify if cement is filling the gap and develops a bonding with casing and formation.
See Also
...
Petroleum Industry / Upstream / Data Acquisition / Well & Reservoir Surveillance / Well logging / Cased-Hole Logging / Well Integrity Logging / Cement Logging
...