Cement Evaluation with New Generation Ultrasonic Tool in Multiple Casings Increases Operational Efficiency in Tengiz Field, Kazakhstan

摘要

Cement evaluation with wireline tools across two different casing sizes is cost-effective and time efficient, but also quite challenging. The acquired data quality, especially across the larger casing, is often affected by the tool eccentricity and poor signal-to-noise ratio due to severe attenuation of acoustic signal by the mud. New ultrasonic technology is required to acquire reliable data for cement evaluation, necessary to assure long-term well integrity and guide operational decision-making processes during well execution. In this paper, authors discussed several case studies, where high quality cement bond data was acquired across both 7-inch liner and 9.875-inch casing in 17.3 ppg oil-based mud in a single wireline descent by using new generation ultrasonic transducers.