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Numerical study of dispersion characteristics of dipole flexural waves in a cased hole with different cement conditions

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Applied Geophysics 2022年第1期19卷 29-40,143,144页

作者： Yang Meng-En Lv Wei-Guo Wu Yang Cui Zhi-Wen Liu Jin-Xia College of Physics Jilin UniversityChangchun 130021China

Crossed-dipole acoustic logging technology is mainly used to measure shear wave and determine the anisotropy or fractures of formation in the fi eld of acoustic *** on the propagation characteristics of dipole flexural waves in cased holes,and the wavefi eld of fundamental flexural mode at three bonding conditions:good cement bonding,poorly bonded interface I,and poorly bonded interface *** dispersion curves of flexural waves are calculated,and the eff ects of cement parameters(elastic parameters and geometric dimensions)on dispersion curves are *** RAI method is used to calculate the dipole full waveforms in a cased hole with conventional or ultralight cement surrounded by a soft ***,the weighted spectral semblance is used to conduct the dispersion analysis of the full *** numerical results show that the cutoff frequency of flexural waves exceeds the frequency band of the current dipole logging tools in the well-bonded cased hole with conventional cement in soft ***,when ultralight cement is used,the cutoff frequency shifts toward low values,and the ultralight cement bonding is conducive to measuring flexural waves in soft *** interface I is poorly bonded,the cutoff frequency shifts toward low values,and the change is evident in soft *** cutoff frequency in the case of ultralight cement bonding is more evident than that of conventional cement *** only interface II is poorly bonded,regardless of the cement used,the cutoff frequencies are all below 2 *** dipole full-wave analysis of diff erent bonding conditions further illustrates that the dispersion characteristics of flexural waves are sensitive to the cement bonding quality of cased holes.

关键词： Soft formation cased borehole flexural wave ultralight cement dispersion analysis cement bonding

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