<p>Cementing operation is an indispensable part of the well completion in the petroleum industry. The cement bond quality has significant influence on the life, the production safety, and the overall benefits of an oil or gas well. Acoustic logging, as one of the important techniques for the cement bond evaluation, mainly uses the amplitude or attenuation of the acoustic waves propagating along the casing to investigate the bond quality of cement sheath with the casing (first interface) and the formation (second interface). Therefore, this paper uses an analytical wave separation method to calculate the detailed propagation characteristics of casing wave in cased borehold wavefield, analyzing the characteristics of casing wave and P-wave of the formation in the wavefield with the change of cement density and microring thickness, respectively, which is achieved by decomposing the full wave of the sound field into contributions from singular points (including branch points and poles) in the wavenumber domain. The results show that high-amplitude casing waves will still appear in well-bonded cased borehole in the case of low-density cement. Therefore, the impact of cement strength should be considered when evaluating cementing quality; the first wave in the first interface unbonded cased borehole are all casing waves in the case of conventional cement, and with the increase of the thickness of the microring, the amplitude of the casing wave increases sharply. This result is consistent with the actual phenomenon.</p>

Calculation and Characteristic Research of Partial Waves in Cased Borehole

Paper Proceedings: https://asmedigitalcollection.asme.org/qnde/QNDE2021/volume/85529

ASME 2021 48th Annual Review of Progress in Quantitative Nondestructive Evaluation (QNDE2021)

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