The importance of cement evaluation has steadily increased as the oil and gas industry strives to ensure and verify zonal isolation. Evaluation must address a broad spectrum of downhole conditions that include various casing thicknesses, mud weights, and cement types. The most -challenging condition occurs with lightweight (low density) cements, where the standard cement-bond systems have virtually the same response in free and cemented pipe. In these conditions, found in many new well completions, cement evaluation is extremely problematic. To address this industry challenge, a new sensor and system has been developed for use downhole.
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