新型硅酸钠微胶囊基自愈性油井水泥的开发和应用

佩莱 蒂埃, 布朗 克里, 舒克 拉艾
英国工程部

摘要

大部分的油井完整性问题都源于油井水泥的裂缝。为了解决裂缝问题，本研究使用了定制的硅酸钠微胶囊，
在 80℃的高温使用条件下为油井水泥引入自主裂缝愈合能力。作者首先对两种类型的硅酸钠微胶囊进行了评估，它
们的聚脲外壳性能不同，适合在井筒中 80℃的高温下使用。两种类型的微胶囊都显示出良好的热稳定性和混合过程
中的存活率。由于前者对油井水泥强度的负面影响要小得多，所以选择了外壳更坚硬的微胶囊，而不是外壳更橡胶
的微胶囊来进一步测试自愈效率。结果发现，在 80℃下固化时，油井水泥本身的愈合能力非常小，但加入微胶囊
后，明显促进了其自愈合性能。在 80℃下固化 7天后，含微胶囊的水泥浆实现了裂缝深度减少 ~58%，吸收系数减少
~76%，抗折强度恢复 ~27%。微结构分析进一步证实了微胶囊的稳定性及其在高温油井水泥体系中开裂时的自愈反
应。这些结果为开发基于微胶囊的油井水泥的自愈性提供了一个很好的前景。

关键词

油井水泥；高温；自修复；硅酸钠微胶囊

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