PowerFlex and PowerEcho annular barrier evaluation services significantly extend the operating range of ultrasonic cement and casing measurement technologies. This powerful family of services answers the need for robust and reliable measurements to quantify annular content and bond and to confirm centralization and condition of the casing, especially for the growing number of wells with heavy well fluids and large-diameter, thick-walled casings. The powerful new transducers incorporated in the two services can effectively overcome the challenges of attenuation of the pulse echo and flexural wave signals in heavy muds, with their performance proved in weights exceeding 18 ppg. PowerFlex and PowerEcho services operate in casing sizes up to 22 in and thicknesses up to 1 in. Their annular evaluation capabilities accurately quantify the cement condition and bond for any cement, from ultralight to heavyweight slurries.