固井水泥用纳米二氧化硅改性吸油树脂性能研究

STUDY ON PROPERTIES OF NANO-SILICA MODIFIED OIL ABSORBING RESIN FOR CEMENTING

为了改善常规吸油树脂的亲和性和分散性,利用纳米二氧化硅对SMA、BMA、St单体的共聚吸油树脂进行改性,分析了改性吸油树脂粒径分布范围,对比了改性前后吸油性能、评价了改性吸油树脂对水泥性能的影响。由评价结果得出,SEM分析证实了纳米二氧化硅改性吸油树脂为多孔星型结构,粒径在300~850μm;改性吸油树脂在80℃下对石油类油品吸油倍率达10倍以上;随着改性吸油树脂加量的增加,水泥浆密度、流动度呈下降趋势,水泥石抗冲击力逐渐升高。而随着粒径的增加,水泥石强度呈现先上升后下降趋势,抗冲击力逐渐降低,470μm为改性吸油树脂最优粒径。研究结果表明,经纳米二氧化硅改性后,吸油树脂与水泥浆的亲和性和分散性得到改善,与改性前吸油膨胀性能相当,水泥石的抗冲击韧性增强。

In order to improve the compatibility and dispersion of the conventional oil absorption resin,nano silica is used to modify the oil absorbing resin copolymer of SMA,BMA,St.The particle size distribution range of modified oil absorption resin is analyzed in this paper,its performance before and after the modification compared,and its effects on the cement properties evaluated.The evaluation results show that SEM analysis indicates that nano silica modified oil absorbing resin is in a porous star structure,particle size between 300~850 m,at 80℃the oil absorption rate of modified resin is more than 10 times.And with the increase in modified oil absorption resin dosage,cement slurry density and flow will decrease,the impact competence of the cement stone will increase.The research shows that the affinity and dispersion of the oil-absorbing resin and the cement slurry are improved after modified by nano-silica,and the anti-impact toughness of the cement is enhanced.