多孔介质中不同缔合能聚合物的吸附滞留研究

Adsorption and retention of polymers with different associative energy in porous media

以疏水基含量分别为0.35%和0.2%的疏水缔合聚合物和常规线性聚丙烯酰胺为对象,研究聚合物缔合能力对吸附滞留特征的影响。采用浸泡法研究了不同浓度聚合物在石英砂上的静态吸附特征,并采用流动实验装置测定了浓度为1500mg/L的三种聚合物在不同速度下的动态滞留量。结果表明,疏水缔合聚合物呈现三段式的静态吸附特征,即先缓慢上升,达到临界缔合浓度后快速上升,最后趋于平稳;缔合能力越强,在临界缔合浓度之后的上升段幅度越大;缔合能力强的聚合物HAWP-0.35能够在3mL/min的注入速度下与HPAM在0.5mL/min具有相当的吸附滞留量,表明缔合能力能够克服注入速度对聚合物在多孔介质中动态滞留量的影响,缔合能力越强,吸附滞留量越大.

Hydrophobic associating polymers with hydrophobic radicals of 0.35%and 0.2%were synthesized by self-synthesizing method and conventional linear polyacrylamide was used to study the effect of polymer association ability on adsorption retention characteristics.The static adsorption characteristics of polymers with different concentrations on quartz sand were studied by immersion method,and the dynamic retention of three polymers with concentration of 1 500 mg/L at different velocities was measured by flow experimental apparatus.The results showed that hydrophobically associating polymers presented a three-stage static adsorption characteristic,that was,it first rose slowly,then rose rapidly when reached the critical association concentration,and finally tended to be stable.The stronger the associative ability,the greater the amplitude of ascending segment after the critical association concentration.The polymer HAWP-0.35 with strong associating ability could adsorb the same amount of retention at the injection rate of 3 mL/min as HPAM at the injection rate of 0.5 mL/min,indicating that the associating ability could overcome the influence of injection rate on the dynamic retention of polymer in porous media.The stronger the associating ability is,the greater the adsorption retention is.