摘要
针对油田聚合物驱(简称聚驱)采出污水,通过对油滴粒度分布、絮凝指数、油水分离特性和Zeta电位等指标的测定,研究了聚合物、温度、药剂以及搅拌强度对絮凝过程的影响,并探讨了影响聚驱采出污水油水分离效果的主要原因.结果表明,静电排斥并不是聚驱采出污水异常稳定的主要原因.聚驱采出污水的油水分离特性与水驱采出污水相比存在显著差别,主要因为聚合物阻碍了小油滴的碰撞絮凝.投加250 mg/L由改性聚醚类破乳剂和弱阳离子絮凝剂复合而成的CHP-03药剂,可以有效克服聚合物的阻碍作用,获得92%的含油去除率.该药剂在絮凝过程中并不依靠电中和机理来实现油滴的脱稳.在现场条件下,温度的提高不能明显地促进油滴絮凝的有效性.适当的高速搅拌可以加快絮体生长.油滴之间的聚结破乳滞后于絮凝,絮凝的后期应避免剧烈搅拌,防止尚未聚结破乳的油滴重新分散.
The particle size distribution, flocculation index, Zeta potential and oil content in water were tested during flocculation of wastewater produced in polymer flooding of oil field. CHP-03, a mixture of a modified pluronic demulsifer and a weak-cationic flocculant, was used to improve the efficiency of oil droplet collision. The effects of polyacrylamide, temperature, and mixing speed on flocculation dynamics are discussed. Polyacrylamide affects the oil-water separation by obstructing the aggregation of small oil droplets, but electrostatic repulsion is not a major factor in preventing flocculation. The local temperature has a limited effect on flocculation. Fast mixing favors the growth of flocs, while slow mixing is suitable for the coalescence of oil droplets. Addition of 250 mg/L CHP-03 can enhance the oil-water separation and remove 92% of the oil content.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2007年第4期761-765,共5页
Environmental Science
基金
中国石油化工股份有限公司胜利油田分公司项目
关键词
聚合物驱
絮凝
粒径分布
静电排斥
polymer flooding
flocculation
particle size distribution
electrostatic repulsion
