锦州9-3油田产出聚合物对污水稳定性的影响研究

针对渤海锦州9-3油田聚合物驱生产污水组成特点,分别测定了不同相对分子质量、质量浓度及水解度的产出聚合物对含聚污水表观黏度、油滴粒径、Zeta电位、油水动态界面张力、油水平衡界面张力、油水界面扩张黏弹性等指标的影响。研究结果表明,含聚污水中产出聚合物的存在会增加含聚污水的黏度,吸附于油水界面增强含聚污水中O/W型乳液滴的Zeta电位,增加水化层以及油水界面膜强度,从而增强污水的乳化程度和稳定性,降低污水中油滴的聚并效率,增大了含聚污水的达标处理难度。

Influence of produced polymer on wastewater stability in JZ9-3 Oilfield

According to the composition of wastewater produced from polymer flooding in Bohai JZ9-3 Oilfield, influences of produced polymers with different molecular weight, concentration and hydrolytic degree on the apparent viscosity, particle sizes of oil droplets, Zeta potential, dynamic interfacial tension, equalize interfacial tension and interfacial dilatational properties were measured. The results indicated that the produced polymer with low molecular weight could improve the apparent viscosity of wastewater, and the Zeta potential of O/W emulsion and the oil-water interfacial film strength were increased after adsorption of polymer in oil-water contact. Consequently the wastewater emulsion stability was increased, and the coalescence efficiency of oil droplets in wastewater was decreased greatly, so that the difficulty of polymer-contained sewage reaching standard became harder.