纳米溶胶在水泥浆中的应用*

Application of Nano Sol in Cement Slurry

王晓亮 许明标 杨晓榕 文 华 刘 郢 张 敏

WANG Xiaoliang XU Mingbiao YANG Xiaorong WEN Hua LIN Ying ZHANG Min

纳米SiO2可改善水泥石的力学性能，但其不能在水泥浆中被充分分散。针对这一问题，以Alko-S烷氧基硅 烷为原料制得一种能在水泥浆中被有效分散的纳米溶胶MCRO-T1。研究了MCRO-T1对水泥浆常规性能、水泥 石力学性能、渗透率和微观形貌的影响，并在渤海湾进行了现场应用。结果表明，MCRO-T1中的SiO2固相含量 为45%，平均粒径为25 nm。当加入1%的MCRO-TI，水泥浆早期强度发展时间缩短了1/3，水泥石抗压强度提高 62.3%，抗折强度提高21.4%，渗透率降低52.1%。纳米颗粒填充在水泥石内部的空隙中，增加了水泥石结构的致 密性，提高了水泥石的韧性。将MCRO-T1应用到渤中尾管固井水泥浆体系中，水泥石早期强度得到有效提高， 固井质量明显改善，解决了渤海湾油气藏地层密封失效的问题，对渤海湾潜山气藏的勘探具有重要意义。图5表2参16

Nano-SiO2 can improve the mechanical properties of cement paste，but it cannot be fully dispersed in cement slurry. Aiming at this problem，a nano sol MCRO-T1 which could be effectively dispersed in cement slurry was prepared using alko-S alkoxysilane as raw material. The effects of MCRO-T1 on the conventional property of cement slurry，mechanical property， permeability and micro morphology of cement paste were studied. Finally，nano sol MCRO-T1 was applied in Bohai Bay. The results showed that the content of solid SiO2 in MCRO-T1 was 45% and the average particle size was 25 nm. When 1% MCRO-T1 was added，the early strength development time of cement slurry was shortened by 1/3，the compressive strength of cement paste was increased by 62.3%，the flexural strength was increased by 21.4%，and the permeability was reduced by 52.1%. Nano particles filled in the voids inside the cement stone，which increased the compactness of cement stone structure and improved the toughness of cement stone. After MCRO-T1 was applied to the cementing slurry system in Bozhong liner，the early strength of cement stone was effectively improved，the cementing quality was significantly improved，and the problem of formation sealing failure of oil and gas reservoir in Bohai Bay was solved，which was of great significance to the exploration of buried hill gas reservoir in Bohai Bay.

10.19346/j.cnki.1000-4092.2021.03.006