聚合物静态吸附研究

针对聚合物在流经油藏多孔介质时所发生的吸附滞留情况及其对驱油效果的影响,通过淀粉-碘化镉比色法对大庆油田杏十三区块聚合物进行静态吸附研究。根据聚合物浓度、温度、水解度以及相对分子量的变化分析对静态吸附量的影响,并得出两种不同类型吸附剂单位质量下对聚合物吸附的变化规律。研究表明,随着聚合物浓度的增加,单位质量的吸附量逐渐增大,而后趋于平缓,且与石英砂相比,聚合物在天然岩芯上的吸附量略大;通过加入氢氧化钠改变聚合物的水解度,聚合物的吸附量随水解度的增大先降低,而后略有回升,同时,随着相对分子量的增加,吸附量缓慢降低;且在一定范围内随着水浴温度的增加而逐渐下降。

Study on Static Adsorption of Polymer

Aiming at adsorption retention of polymer through the reservoir pore and its effect on oil displacement, study on polymer static adsorption of Daqing oilfield Xing thirteen block was carried out by the starch-cadmium iodide colorimetric method. The effect of polymer concentration, temperature, degree of hydrolysis and relative molecular weight on the static adsorption capacity was analyzed, and the changing law of polymer adsorption under the unit mass of two different types of adsorbents was obtained. The result shows that, with increasing of polymer concentration, the adsorption amount of unit mass increases gradually, and then tends to be gentle; Compared with quartz sand, the adsorption amount of polymer in the core sand is slightly larger. By adding sodium hydroxide to change the polymer hydrolysis degree, the adsorption amount of polymer increases with increasing of hydrolysis degree and then decreases slowly, at the same time, adsorption capacity slowly decreases with increasing of the relative molecular weight; and adsorption capacity gradually decreases with increasing of the water temperature.