USIT
Ultra-Sonic Imaging (USI) Tool is an advancement on conventional sonic tools used for cement evaluation. It uses a single rotating transducer and receiver to emit and receive ultra-sonic waves and provide complete circumferential casing coverage. Another improvement of the USI Tool is the presentation of data in a color map, which allows the interpreter of the log to quickly identify intervals of good cement and the segments with problems in the cement sheath. Since its introduction, USI tools have proved to be a superior cement evaluation tool that overcomes most of the problems found with the limitations and interpretation constraints of other cement bond logging tools.