Abstract Ultrasonic scanning tools measure the casing thickness by inducing a mechanical resonance of the casing in the thickness mode. At the same time they measure the cement acoustic impedance at higher radial and vertical resolution than sector and segmented tools. A modified Multi-sensor caliper tool measures the casing ID with excellent accuracy and resolution. A DFT algorithm implemented in the ultrasonic radial scanner tool improves the circumferential and vertical coverage of the thickness over previous methods while widening the measurement range, resolution and accuracy. The algorithm is performed by the tool with more circumferential coverage of the pipe than before. The tool performs this in real time at normal logging speed, thus saving operation and rig time. When the new ultrasonic radial scanner tool is combined with the new multi-sensor caliper, the magnetic flux-leakage tool, and the CBL in one pass, the tool string generates data that identifies casing damage otherwise difficult to detect with just one of the tools. In addition, the ultrasonic cement impedance measurement and the CBL-VDL (in combination) identify clearly the cement bond conditions. This combination provides comprehensive well mechanical integrity interpretation of the well. New 3D visualization capabilities of caliper, magnetic flux-leakage, and ultrasonic measurements provide the operator with information to interpret broken or parted casing. This 3D visualization also provides critical information after the remedial work is finished. Discerning whether there is internal or external damage is important information for the operator. The capability to identify previously undetected casing damage corroborates the new high resolution real time thickness methodology and the improved multi-sensor internal caliper measurements. The four tools in combination provide a valuable method for identifying difficult casing problems.