约瑟夫·施兰根,利蒂娜

大多数油井完整性问题源于油井水泥的裂缝。为了解决裂纹问题，本研究使用定制的硅酸钠微胶囊在 80 °C 的高温使用条件下为油井水泥引入自主裂纹愈合能力。两种类型的硅酸钠微胶囊的聚脲壳特性不同，本文首先评估了它们在井筒中80°C高温下的适用性。两种类型的微胶囊在混合过程中都表现出良好的热稳定性和生存能力。作者选择具有更坚硬外壳的微胶囊而不是具有更橡胶外壳的微胶囊以进一步测试自愈效率，因为前者对油井水泥强度的负面影响要小得多。结果发现，油井水泥在80°C下固化时，其自身的愈合能力非常小，但微胶囊的加入显着提高了其自愈性能。在80°C下愈合7天后，含微胶囊的水泥浆体裂缝深度减少了约58%，吸附系数减少了约76%，抗弯强度恢复了约27%。这些结果为自修复微胶囊油井水泥的开发提供了前景。

油井水泥；高温；自我修复；硅酸钠微胶囊

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