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采用空气悬浮法制备以过硫酸铵 (APS)为活性芯材料的压裂液微胶囊延迟破胶剂 ,设计了以乳液聚合方式合成的含氯化乙烯单体的三元共聚物为内层 ,以有机硅接枝改性的聚丙烯酸超微乳液和无机硅高分子材料为外层的体系 ,制成复合膜。可以通过改变膜层厚度、包衣乳液中助剂组成以及成品溶剂处理等方法调整胶囊的保护程度和释放行为。包衣材料回收率 90 % ,室温下水溶液中的初始释放率 <0 .5 % ,有符合应用需要的释放特性和化学、机械稳定性。 80℃下加入浓度为 0 .1 % (ω)的胶囊破胶剂的压裂液冻胶在 2h后仍可保持其初始粘度的 2 /3,与加入浓度为 0 .0 2 % (ω)的过硫酸铵的压裂液相比 ,岩心渗透性的伤害率由 2 5 .7%下降为 8.5 %。
The airborne suspension method was used to prepare the fracturing fluid microcapsule delayed breaker with ammonium persulfate (APS) as the active core material. The terpolymer containing vinyl chloride monomer synthesized by emulsion polymerization was designed as the inner layer, A composite membrane was prepared by the system of polyacrylic acid super-microemulsion modified with organosilicon and inorganic silicon polymer. The capsule protection level and release behavior can be adjusted by changing the thickness of the coating, the composition of the adjuvant in the coating emulsion, and the solvent treatment of the finished product. The coating material recovery 90%, the initial release rate of aqueous solution at room temperature <0.5%, there is release characteristics and chemical and mechanical stability in line with the application needs. The initial viscosity of the fracturing fluid gel with the concentration of 0.1% (ω) added at 80 ℃ was maintained at 2/3 after 2 h, Ammonium permanganate fracturing fluid compared to core permeability damage rate decreased from 25.7% to 8.5%.