The basic properties of alkali–surfactant–polymer (ASP) flooding produced water and effect of oil displacing agent on the stability of flooding produced water were obtained by measuring and analyzing the water quality of Zhong-106, etc., flooding water from Daqing Oilfield and the relationship between oil content-settling time and oil displacing agent-oil drop size. The addition of ternary oil displacement agent to ASP flooding water greatly increases the difficulty of oil–water separation, higher concentration, and worse separation effect after standing. Surfactant alkali and polymer have effect of promoting the reduction of oil droplet size distribution and are all affected by the initial oil content and pH. When pH is between 10.5 and 11.75, the average particle size of oil drop in ASP produced water changes the most significantly, and as the alkali content increases, the pH of the produced water rises faster. Alkali reacts with the active substances contained in the crude oil in the produced water, such as organic acids, thereby increasing the pH of the produced water. The pH of the produced water changes smoothly when alkali content is 5000 mg/L, but all are less than alkaline flooding water, which shows that alkali can promote the partial hydrolysis of polymer in the produced water and the process can reach equilibrium. The ASP flooding produced water after 48 h of settling formed a trace amount of nano-oil droplets, also accompanied by the accumulation and separation of a part of the oil droplets.

通过对大庆油田中106等驱采水水质的测定分析，得到碱-表面活性剂-聚合物(ASP)驱采出水的基本性质及驱油剂对驱采出水稳定性的影响。含油量-沉降时间与驱油剂-油滴大小的关系。三元驱油剂中加入三元驱油剂大大增加了油水分离的难度，浓度更高，静置后分离效果更差。表面活性剂碱和聚合物具有促进油滴粒径分布减小的作用，均受初始含油量和pH值的影响。当pH值在10.5～11.75之间时，三元复合采出水中油滴平均粒径变化最显着，并且随着碱含量的增加，采出水的pH值上升得更快。碱与采出水中的原油中所含的有机酸等活性物质发生反应，从而提高采出水的pH值。采出水pH在碱含量为5000mg/L时变化平稳，但均小于碱性驱水，说明碱能促进采出水中聚合物的部分水解，达到平衡。沉降48 h后三元复合驱采出水形成微量纳米油滴，同时伴随着部分油滴的积累和分离。例如有机酸，从而提高采出水的pH值。采出水pH在碱含量为5000mg/L时变化平稳，但均小于碱性驱水，说明碱能促进采出水中聚合物的部分水解，达到平衡。沉降48 h后三元复合驱采出水形成微量纳米油滴，同时伴随着部分油滴的积累和分离。例如有机酸，从而提高采出水的pH值。采出水pH在碱含量为5000mg/L时变化平稳，但均小于碱性驱水，说明碱能促进采出水中聚合物的部分水解，达到平衡。沉降48 h后三元复合驱采出水形成微量纳米油滴，同时伴随着部分油滴的积累和分离。