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《Well Logging Technology》 2004-05
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Model Experiments on the Evaluation of the Cement Bond with Ultrasonic Pulse Echo Techniques

QIAO Wen-xiao (Well Log Research Center, University of Petroleum, Changping, Beijing 102249, China)  
Previous research shows that, when the transducer is immersed in slurry, it is nearly impossible to determine the cement bond quality of the interface between the cement annulus and formation (Interface Ⅱ) using the ultrasonic pulse echo technique(UPET). Because strong reflection occurs on the interface between the slurry and casing, most portion of the pulse energy is reflected back. In this paper, methods of cement bond evaluation are studied in four different model experiments, in which the transducer is contacted closely to the casing. In these experiments, no matter whether the ultrasonic pulses are normally or obliquely incident upon the casing, obvious signals corresponding to the Interface II are observed. Considering the practical implementation of the technique, a thin steel plate is inserted between the transducer and casing. The reflection signal can still be achieved. The model experiments indicate that the transducer-contact-casing system can eliminate the influence of the slurry, improve the ratio of signal to noise, evaluate the interface between the casing and cement (Interface I), and determine the cement bond quality of the Interface II if the Interface I is well bonded.
【CateGory Index】: TE256
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Chinese Journal Full-text Database 1 Hits
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Chinese Journal Full-text Database 10 Hits
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