Abstract: Core flood experiments were carried out using unconsolidated SiC sand －packs at different injection rates under isothermal conditions． The thickness of adsorbed polymer layers could be calculated from the residual resistance factors
measured in core flood experiments．The results show that adsorption of cationic polymers in porous media is affected mainly by electrostatic attraction and hydrodynamic forces． At low polymer injection rates， polymer adsorption is dominated by electrostatic forces， while it is dominated by hydrodynamic forces at higher polymer injection rates． The adsorbed layer thickness increases linearly from 290 to 1510 nm with polymer injection rates．The adsorbed layer thickness is also affected by the brine injection rate in back－flush： high brine injection rate can increase the adsorption． Therefore， the adsorption of
polymers can be improved using higher rates in squeezing both polymer and back －flush brine solutions，and so the water control efficiency．

Key words: Cationic polymer , Hydrodynamic adsorption , Resistance factor , Residual resistance factor , Adsorbed layer

摘要： 为研究聚合物和盐水注入速度对阳离子聚合物在多孔介质中吸附的影响，用碳化硅颗粒制作填砂模型，进行了恒温驱替实验，根据测试的残余阻力系数计算不同注入速度下的聚合物吸附层厚度。结果表明，阳离子聚合物在多孔介质中的吸附主要受静电引力和水动力的影响。在低的聚合物注速时，静电引力起主导作用；而在较高注速时，水动力起主导作用。聚合物注入速度增加，吸附层厚度呈线性增加，从 290 nm增加到 1 510 nm。盐水注入速度(后置液)对吸附层厚度也有一定影响，吸附层厚度随盐水注速增加而增加。提高聚合物溶液和后置盐水溶液的注入速度，有利于改善地层岩石的聚合物吸附能力，提高堵水效果。

关键词: 阳离子聚合物 , 水动力学吸附 , 阻力系数 , 残余阻力系数 , 吸附层