自组装颗粒深部调堵体系的性能评价

Performance Evaluation of Self-assembled Particles System for In-depth Profile Control

为提高颗粒堵剂深部封堵作用,研究了一种双层覆膜的微米级自组装颗粒深部调堵剂的微观形貌、悬浮性能、封堵性能,并分析了该堵剂的封堵机理。研究结果表明:所制备的自组装颗粒为粒径56.5数270.5μm的圆球型颗粒,在聚合物溶液中具有良好的悬浮性能,质量分数5%的自组装颗粒在0.3%聚合物溶液中静置20 h的悬浮率大于90%;65℃下注入1 PV的自组装颗粒悬浮体系(质量分数为5%自组装颗粒+0.2%聚合物)后对渗透率9000×10^(-3)~15000×10^(-3)μm^2的岩心的封堵率均在90%以上。自组装颗粒在封堵岩心中的分布状态表明:自组装颗粒具有填充封堵、黏接架桥封堵、黏连填充封堵功能。

In order to improve the in-depth profile control action of particulated plugging agent, the particle size, microstructure, suspension performance, plugging rate and blocking mechanism of the micro-scale self-assembled particles （MSSAP） with double layer coating, were studied by laboratory experiments. The results showed that the size of the prepared spherical self-assembled particles were 56.5--270.5 μm, and it had a good suspension performance in the polymer solution, suspension rate reaching 90% in a 0.3% polymer solution for 20 h. Block experiment showed that its plugging rate was above 90% after injection of self-assembled particles system （5% MSSAP ＋0.2% polymer） at 65℃ into the cores with permeability of 9000 ×10^-3～15000×10^-3μm^2. The distribution state of MSSAP particles in the core after sealing showed that the plugging mechanism of the MSSAP were plugging, adhesive bridge blocking and adhesive filling.