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Channeling detection at the interface Ⅱ (cement-formation interface) is a key technical problem in the cementing quality evaluation. The structure and principle were introduced for the second generation of azimuthally acoustic bond tool (AABT2. 0). Different channeling situations at the interface II were simulated using the finite difference algorithm, and the application effects of AABT2. 0 were analyzed in determining the central azimuth and angle range of the channeling. The numerical simulation results show that the central azimuth of the channeling can be obtained by analyzing the amplitudes of casing waves received by different azimuth array elements in the arcuate phased array (APA) acoustic receiver station. Compared with the individual-reception mode, the measurement accuracy of the angle range is greatly improved when the APA acoustic receiver station works in the scanning-reception mode. The channeling distribution in different depth sections can be obtained intuitively by logarithmic normalized imaging. The work of this study lays a theoretical foundation for the processing of AABT2. 0 actual data. [ABSTRACT FROM AUTHOR]

In horizontal or high-inclination well sections, the casing and logging tool usually have downward eccentricity due to gravity, which interferes with the measurement response of azimuthally acoustic bond tool (AABT). The azimuth of the cement channeling cannot be effectively distinguished by AABT under these circumstances. In this paper, the measurement responses of AABT under the conditions of tool eccentricity and casing eccentricity are numerically simulated by a three-dimensional finite difference algorithm. The relationship between the eccentricity distance and the amplitude of received waveform in each azimuth is analyzed, and an azimuth measurement correction method of the cement channeling is proposed. The numerical simulation results show that the tool eccentricity has a great influence on the measurement response of AABT, and it is difficult to directly obtain the azimuth of the cement channeling from the amplitude distribution curve of the first arrival. Based on the response characteristics of the eccentric tool in the free casing condition, the eccentricity effect of the tool can be corrected. The azimuth of the cement channeling can be accurately obtained from the corrected amplitude distribution curve of the first arrival. The influence of casing eccentricity on the measurement response of AABT is quite small and can usually be ignored. The work of this study lays a theoretical foundation for the processing of AABT actual data. [ABSTRACT FROM AUTHOR]

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