混凝法处理胜利油田聚合物驱采出水效果研究

采用化学混凝法处理胜利油田聚合物驱采出水,并在比较不同单一混凝剂的除油、除浊效果基础上,进行了混凝剂的优化复配。结果表明:传统铝盐和传统铁盐混凝剂的除油、除浊效果明显优于无机高分子混凝剂和有机高分子絮凝剂。氯化铁和氯化铝按投加量质量比为1:3比例复配时,不但能提高絮体的沉降速度,减少污泥量,而且能达到较高的除油、除浊效果。复配铁铝混凝剂与阴离子聚丙烯酰胺(APAM)三元复配时,除油、除浊效果主要决定于无机复配铁铝混凝剂的投加量;投加0.5mg/L的APAM便能使絮体进一步发生桥联作用,提高沉降性和减少污泥体积。

Effect of produced wastewater from polymer flooding in Shengli Oilfield treated by the coagulation method

The produced wastewater from polymer flooding in Shengli Oilfield was treated by the chemical coagulation method. The applicable coagulants were chosen and compounded based on the comparison of the single coagulation effect of each coagu-lant. The results showed that the oil or turbidity removal efficiencies of traditional aluminum salt or iron salt coagulants were much better than those of the inorganic polymer coagulants or organic polymer flocculants. When the aluminum chloride and iron chlo-ride were compounded with the dosage mass ratio of 1:3, it could not only improve the settling performance and decrease the vol-ume of sludge, but also obtained high oil and turbidity removal efficiencies. When the compounded aluminum-iron coagulant was compounded with anionic polyacrylamide (APAM), the oil and turbidity removal efficiencies were dominated by the dosage of the inorganic compounded aluminum-iron coagulant. And at the dosage of 0.5 mg/L, APAM could bridge the flcos and improve the settling performance and decrease the volume of sludge.