摘要
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.
作者
孟祥海
黎慧
张云宝
邹剑
郑双益
代磊阳
MENG Xianghai;LI Hui;ZHANG Yunbao;ZOU Jian;ZHENG Shuangyi;DAI Leiyang(Tianjin Branch,CNOOC(China)Ltd.,Tanggu,Tianjin 300452,P R of Chin)
出处
《油田化学》
CAS
CSCD
北大核心
2018年第2期231-234,240,共5页
Oilfield Chemistry
关键词
覆膜颗粒
自组装体
深部调堵
封堵率
封堵机理
coated particles
self-assembled particles
in-depth profile control
plugging rate
plugging mechanism