In this paper, we present new ultrasonic cement evaluation technology developed and extensively field tested over the past years. The introduction of this technology increases reliability and efficiency, and enables well integrity inspection in extreme environments with heavy muds and very large and thick casings. Such extreme conditions with heavy synthetic oil-based muds up to 20 lbm/gal and casing thicknesses up to and above 1 in. are often encountered when dealing with wells in deep water, wells used for carbon sequestration and underground gas storage, and shale oil and gas wells subject to hydraulic fracturing. Conventional ultrasonic cement evaluation technology has not been able to properly assess these cases in the past.
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