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采用自由基水溶液聚合法,以纳米二氧化硅(nano-SiO2)、丙烯酸(AA)、丙烯酰胺(AM)和2-丙烯酰胺基-2-甲基丙磺酸(AMPS)等单体为主要原料,合成了四元共聚物降滤失剂P(AA-AMPS-AM)/nano-SiO2;采用FTIR法表征了该降滤失剂的组成,并评价了它的降滤失性效果、抗盐、抗钙和抑制性等性能,同时考察了该降滤失剂与其他处理剂的配伍性。实验结果表明,该降滤失剂具有良好的耐温抗盐降滤失性能,同时具有良好的抑制性能;与常用处理剂配伍性好,可在水基钻井液体系中显著降低其高温高压滤失量,所形成的饱和盐水钻井液体系在密度2.37 g/cm3下的高温高压滤失量仅为20.0 mL,满足高温下控制钻井液性能的需求。
Using free-radical aqueous solution polymerization method, nano-SiO2, acrylic acid (AA), acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AA-AMPS-AM) / nano-SiO2 was synthesized as a raw material, the composition of the fluid loss control agent was characterized by FTIR method, and the effect of fluid loss control was evaluated. Salt, anti-calcium and inhibitory properties, at the same time investigated the compatibility of the fluid loss and other treatment agent. The experimental results show that the fluid loss control agent has good properties of temperature and salt resistance and fluid loss control and good inhibition performance. It has good compatibility with common treatment agents and can significantly reduce the high temperature and high pressure filtration in water-based drilling fluid systems Loss, the formation of saturated brine drilling fluid system at a density of 2.37 g / cm3 under high temperature and high pressure filtration loss of only 20.0 mL, to meet the needs of drilling fluid under high temperature performance requirements.