无机矿物对三元复合驱中聚合物吸附性能影响

三元复合驱过程中，聚合物会发生吸附现象，导致黏度降低，波及体积变小。研究了新疆油田三元复合驱实验中，无机矿物对聚合物吸附的影响因素。结果显示，对聚合物吸附最强的是蒙脱石，其次是绿泥石、伊利石，长石和石英砂最小；聚合物在松散岩心上的吸附大于胶结岩心上的吸附；随着渗透率的降低，聚合物的动态吸附量逐渐减小。与纯聚合物驱相比，三元复合驱中聚合物的黏度和吸附量要小的多，这主要是因为三元复合驱中高浓度的碱相当于增大了无机盐的浓度，压缩了聚合物导致吸附变小；而表面活性剂与聚合物产生了竞争吸附，降低了聚合物的吸附量。

Effect of inorganic minerals on adsorption properties of polymers in ASP flooding

During the process of ASP flooding，the adsorption of polymer would happen，resulting in a decrease in viscosity and sweep volume.The factors affecting the adsorption of inorganic minerals on polymers in the ASP flooding experiment in Xinjiang Oilfield were studied.The results showed that montmorillonite was the strongest adsorbent for polymers，followed by chlorite，illite，feldspar and quartz sand.The adsorption of polymers on loose cores was greater than that on cemented cores. With the decrease of permeability，the dynamic adsorption capacity of polymers decreased gradually.Compared with pure polymer flooding，the viscosity and adsorptive capacity of polymer in ASP flooding were much smaller，which was mainly because the high concentration of the alkali in the ASP flooding was equivalent to the increase of the inorganic salt concentration and reduced the adsorptive capacity of polymer due to the compression of polymer.And the surfactant and polymer had competitive adsorption，which reduced the adsorptive capacity of polymer.