Quantitative Calculation and Correction of the Influence of Microannulus on Acoustic Amplitude Log
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摘要: 为了消除微环隙对声幅测井曲线的影响,提高固井质量评价精度,在分析声波在介质中传播特性的基础上,分别建立了胶结良好时和微环隙存在时的各界面分层介质模型,并对2种情况下声幅测井接收到的声波强度表达式进行了推导,得到了声幅比值的表达式。该表达式可以量化微环隙对声幅测井的影响,并对声幅测井曲线进行校正。实例应用表明,实例井声幅测井曲线在校正后的最高相对声幅值从57%~59%降至36%~38%,固井质量评价结果由原来的胶结差变为胶结一般。由此可以看出,微环隙对声幅测井评价固井质量的影响是很大的,很容易对固井质量产生错误的评价,因此有必要对其校正,以提高固井质量评价的准确性。Abstract: In order to eliminate the effect of microannulus on acoustic amplitude logging,improve the accuracy of cementing quality evaluation,on the basis of analyzing propagation characteristics of acoustic wave in media,various interface layered medium models for good cementation and cementation with microannulus were built,the received acoustic intensity of acoustic amplitude logging in these two cases was derived,and acoustic amplitude ratio expression was obtained.The expression quantifies the effect of microannulus on acoustic amplitude logging and can be used to correct the acoustic amplitude logging curve.Actual application showed that,after correction,highest relative sound amplitude decreased from 57%-59% to 36%-38%,and the cement quality evaluation turned from poor to average.It can be seen that microannulus has significant impact on the results of acoustic amplitude logging evaluation,causing error in evaluation of cementing quality,so its correction is necessary for improving the accuracy of cementing quality assessment.
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