Study on Bonding Quality of Cement-Casing Interfacial Transition Zone Based on Acoustic Impedance Testing: Influence of Microstructural Characteristics

Cement and Concrete Composites Pub Date : 2025-09-09 DOI:10.1016/j.cemconcomp.2025.106329

YuHao Wen, Haizhi Zhang, Linsong Liu, Zhenyu Tao, Huiting Liu, Renzhou Meng, Yi Hao, Zhengrong Zhang, Ziyue Wang

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Abstract

Investigating the interfacial transition zone (ITZ) between cement and casing, along with its bonding quality, holds significant importance for enhancing downhole cementing integrity. This study employed acoustic impedance testing to characterize interfacial bonding quality, while utilizing X-ray diffraction (XRD), scanning electron microscopy (SEM), and backscattered electron spectroscopy-energy dispersive spectroscopy (BSE-EDS) to elucidate cement-casing interfacial bonding mechanisms. The research methodology for ITZ microstructure analysis was optimized, establishing intrinsic correlations between ITZ microstructural characteristics and interfacial bonding performance. Results demonstrate that elevated free water content at the cement-casing interface promotes cement clinker accumulation within ITZ, forming a porous microstructure that compromises interfacial bonding. Enhanced hydration reaction efficiency and controlled cement sheath deformation characteristics effectively improved interfacial bonding quality, with gel phase content exhibiting a more pronounced strengthening effect than volumetric deformation factors. Specifically, gel phase content showed a negative correlation with ITZ thickness - increased gel phase proportion reduced ITZ thickness to 10-30 μm, achieving optimal interfacial bonding performance.

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基于声阻抗测试的水泥-套管界面过渡区粘接质量研究：微观结构特征的影响

研究水泥与套管之间的界面过渡区（ITZ）及其胶结质量，对于提高井下固井的完整性具有重要意义。本研究采用声阻抗测试来表征界面结合质量，同时利用x射线衍射（XRD）、扫描电镜（SEM）和背散射电子能谱-能量色散能谱（BSE-EDS）来阐明水泥-套管界面结合机制。优化了ITZ微观结构分析的研究方法，建立了ITZ微观结构特征与界面键合性能之间的内在相关性。结果表明，水泥-套管界面处自由水含量的升高促进了水泥熟料在ITZ内的积累，形成了影响界面粘合的多孔微观结构。提高水化反应效率和控制水泥环变形特性能有效改善界面粘结质量，其中凝胶相含量的强化效果比体积变形因素更为明显。凝胶相含量与界面黏结厚度呈负相关，增加凝胶相比例可使界面黏结厚度降低至10 ~ 30 μm，达到最佳界面黏结性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Cement and Concrete Composites

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