超声脉冲反射法评价第Ⅱ界面的模拟实验

The Mode Experiments on Evaluation of the Bond BetweenCement Annulus and Formation with Ultrasonic Echo Technique

乔文孝等：超声脉冲反射法评价第Ⅱ界面的模拟实验，测井技术，１９９６（３）２０，１９２～１９６。针对超声脉冲反射法能否对第Ⅱ界面进行胶结评价的问题，在实验室内进行了模拟实验和理论计算。实验结果表明，无论在时域还是在频域，与第Ⅱ界面所对应的特征信息均不明显。对于模拟各种胶结状况的情形，反射系数的理论计算与实验测量结果均有很好的一致性。本文认为，在实际工作中仅靠超声脉冲反射法难以评价第Ⅱ界面的水泥胶结质量。

Mode experiemnts have been made to verify the possiblity of determining thecement bond quality between cement annulus and formation with ultrasonic echotechnique. The experimental results show,whether in time domain or in frequencydomain, there is no obvious characteristics in acoustic signal against the interfacebetween cement annulus and formation.The calculated reflectivity is in good agreement with the measured one. So, there may be no likelihood to determine the cement bond quality of the interface only by ultrasonic echo technique.