Mechanism Investigation and Performance Evaluation of Water Indispersible Cement Slurries
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摘要: 基于胶体稳定理论、双电层压缩及吸附架桥原理，对水不分散水泥浆体系作用机理进行了探讨，并采用扫描电镜分析（SEM）进一步证明抗分散絮凝剂BCY-100S对水泥颗粒的架桥凝聚作用。评价了多种减阻剂对水不分散水泥浆流变性能和抗分散性能的影响，优选出能改善流变且不影响抗分散性能的BCD-200S作为配套减阻剂。评价了3种水灰比分别为0.45、0.47和0.50的水不分散水泥在30～80℃的抗分散性能、力学性能及其综合性能，结果表明，水灰比增大不影响水不分散水泥浆的抗分散性，水不分散水泥浆的游离液量为0 mL，上下密度差不大于0.03 g/cm3，流动度不小于20 cm，失水量可控制在50 mL以内，其力学性能满足施工要求。Abstract: The working mechanisms of water indispersible cement slurries are investigated in the light of colloidal stability theory, electric double layer compression theory and principle of bridging by adsorption. The bridging cohesion effect of an indispersible flocculant BCY-100S on cement particles was proved by SEM analysis. By evaluating the effects of many drag reducers on the rheology and dispersion resistance of water indispersible cement slurries, a drag reducer BCD-220S, which helps improve the rheology of cement slurry and does not affect the dispersion resistance of the same, was selected. Three water indispersible cement slurries with water/cement ratio of 0.45, 0.47 and 0.50, respectively, were tested for their dispersion resistance, mechanical performance and comprehensive performance under 30-80℃. It was found that increase in water/cement ratio did not affect the dispersion resistance of the water indispersible cement slurries. The water indispersible cement slurries had free water of 0 mL, density difference of the top and the bottom cement slurries of less than 0.03 g/cm3, mobility of greater than 20 mL, filtration rate that can be controlled in less than 50 mL, and mechanical properties that satisfied operation requirements.
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Key words:
- Water indispersible cement slurry /
- Mechanism /
- Well cementing /
- Water invasion
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