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环行声波测井在下套管井中可以用来检查固井质量,在裸眼井地层中可以用来探测地层垂直裂缝。本文从理论上推导套管井三层介质(井内介质、套管、管外介质)的波动方程、波函数解以及它的频散方程,还提出它的特例自由套管、裸眼井地层等的频散方程,初步作了一些分析。另外,用变角装置测出套管井三层介质各种模式波的波形曲线,计算出它们的频谱曲线,提出用变角装置来研究确定那一种模式波探测裂缝效果最好,不但主频幅度表减最大,而且主频发生偏移。
Ring acoustic logging can be used to examine cementing quality in cased holes and can be used to detect vertical fractures in openhole formations. In this paper, we theoretically deduced the wave equation, wave function solution and its dispersion equation of three layers of media (well medium, casing and pipe outer medium) in cased hole, and also put forward its special case of free casing, Scattered equations, made some preliminary analysis. In addition, the waveform curves of various modes waves of three layers of cased hole media were measured by means of variable angle device to calculate their spectrum curves. It was suggested that the use of variable angle device to determine which mode wave to detect cracks is the best, not only the frequency Amplitude table minus the largest, but the frequency offset.