Shear Bond Strength (SBS) is an important property of cement that determines the life of oil and gas wells. This paper presents the results of an experimental study on the effect of carbonation on the SBS of cement under high-pressure high-temperature (HPHT) condition. The study is aimed at examining the effects of CO₂ concentration, temperature, and pressure on SBS of cement containing 35% of silica flour. The study was conducted by aging two types of specimens (i.e. cement cores and SBS samples made of steel pipe and cement). After curing, the specimens were aged for 14 days in an autoclave. The autoclave was 80% filled with brine saturated with mixed gas containing CO₂ and CH₄. Aging pressure (21–62 MPa), temperature (38–221 °C) and CO₂ concentration (10–100% CO₂) were varied. After aging, the specimens were recovered, and their SBS, porosity and mineralogical composition were determined to assess the level of carbonation and degradation.

To identify the most dominant factor affecting the SBS of cement, measurements were analyzed applying the Analysis of Variance (ANOVA) method. The analysis showed that temperature has a more prominent effect on the carbonation process than pressure and CO₂ concentration. Furthermore, results showed strong interaction effect among the main influential factors (pressure, temperature and CO₂ concentration). SBS increased with the carbonation. Medium-range temperatures (107 and 177 °C) caused high levels of carbonation as manifested by huge improvement in SBS and a significant reduction in porosity after exposure to a carbonic acid environment.

剪切粘结强度（SBS）是水泥的重要属性，它决定了油气井的寿命。本文介绍了在高压高温（HPHT）条件下碳化对水泥SBS影响的实验研究结果。该研究旨在检查CO ₂浓度，温度和压力对含35％硅粉的水泥的SBS的影响。通过老化两种类型的样本（即水泥芯和由钢管和水泥制成的SBS样本）进行了研究。固化后，将样品在高压釜中老化14天。高压釜中填充有饱和的盐水，该盐水饱和了包含CO ₂和CH _4的混合气体。老化压力（21–62 MPa），温度（38–221°C）和CO ₂浓度（10-100％CO ₂）各不相同。老化后，回收标本，并确定其SBS，孔隙率和矿物组成，以评估碳化和降解水平。

为了确定影响水泥SBS的最主要因素，使用方差分析（ANOVA）方法对测量值进行了分析。分析表明，温度对碳化过程的影响比压力和CO ₂浓度更为显着。此外，结果表明主要影响因素（压力，温度和CO ₂浓度）之间具有强烈的相互作用。SBS随碳化而增加。中等温度（107和177°C）导致碳酸水平高，这表现为SBS的巨大改善和暴露于碳酸环境后孔隙率的显着降低。