交联聚丙烯酰胺微球的形状与大小及封堵特性研究  

SHAPE,SIZE AND PLUGGING PROPERTIES OF CROSSLINKED POLYACRYLAMIDE MICROSPHERES

作　　者：林梅钦[1] 董朝霞[1] 彭勃[1] 李明远[1] 吴肇亮[1] 

机构地区：[1]中国石油大学提高采收率研究中心,北京102249

出　　处：《高分子学报》2011年第1期48-54,共7页Acta Polymerica Sinica

基　　金：国家重大科技专项资助项目(项目号2008ZX0509)

摘　　要：采用流变、扫描电镜(SEM)、动态光散射(DLS)、核孔膜过滤和填充砂管驱替实验,研究了纳米级水溶胀交联聚丙烯酰胺微球的性能.结果表明,在一定的剪切速率范围内,微球浓度为100～900 mg/L的分散体系的黏度随剪切速率增加而增大,表现出较明显的剪切增稠的胀流体特性,微球浓度为50 mg/L的分散体系的黏度随着剪切速率增加基本保持不变,表现出牛顿流体特性,而微球浓度为1500 mg/L的分散体系的黏度随着剪切速率增加有所降低,表现出假塑性流体特性.交联聚丙烯酰胺微球分散体系能够对0.4μm核孔膜形成有效封堵,而且能够深入填充砂管的深部形成封堵.交联聚丙烯酰胺微球在水中溶胀后粒径增大,且呈多分散性分布,其形态接近球形.交联聚丙烯酰胺微球的深部封堵特性与其具有一定的变形性有关.The properties of nanoscale water-swellable crosslinked polyacrylamide microspheres were inverstigated by HAAKE rheometer,scanning electron microscopy（SEM） and dynamic lighting scattering（DLS）.Besides,filtration experiments with nuclear pore films and displacement experiments of sand packed tube were also adopted to investigate selective plugging characteristics of the nanoscale water-swellable crosslinked polyacrylamide microspheres.The results showed that within a certain range of shear rate,the viscosity of the crosslinked polyacrylamide microsphere dispersed system increased with the raising of shearing rate if the concentration of microspheres was limited in 100 ～ 900 mg/L.This phenomenon showed that the crosslinked polyacrylamide microphere dispersed system represented shear-thickening.The viscosity of 50 mg/L microsphere dispersed systems didn ’t change obviously with shearing rate increasing,which showed newtonian fluid characteristics.The dispersed system with concentration of 1500 mg/L showed pseudoplastic fluid property its viscosity decreased with the shear rate increasing.The grain diameter of crosslinked polyacrylamide microspheres increased and it appeared polydispersitic microsphere in the dispersed system due to swelling,and an obvious size polydispersity was observed.These microsphere dispersed systems exhibited effective plugging on 0.4 μm pore-size nuclear pore film and deep plugging in sand packed tube.This deep plugging property of crosslinked polyacrylamide micorspheres closely depends on their deformability under presssure.

关 键 词：交联聚丙烯酰胺微球 流变性 核孔膜 封堵特性 

分 类 号：TE39[石油与天然气工程—油气田开发工程] O633.22[理学—高分子化学]