污水配制聚合物溶液影响因素及增粘效果分析

针对大庆油田污水配制聚合物溶液存在严重粘度损失的问题,研究了污水中阴阳离子对聚合物溶液粘度的影响并提出改善措施。研究表明:对聚合物溶液粘度影响较大的是阳离子,其顺序是:Fe~(2+)Fe3~+Mg~(2+)(Ca~(2+))Na~+(K~+)。配置要求是Na~+、K~+含量3 000 mg·L-1,最好控制在1 000 mg·L-1以下;Ca~(2+)的含量200 mg·L-1,Mg~(2+)含量100 mg·L-1。Fe~(2+)、Fe~(3+)的影响严重,需严格控制含量;而阴离子对聚合物溶液粘度的影响可以忽略不计;该镁离子为该区块影响聚合物溶液粘度的主要因素。利用腐植酸钠吸附法去除溶液中的钙镁离子,经离子吸附处理后溶液增粘14.2 m Pa·s。腐殖酸钠混合液用量为8.0 m L时对钙离子的吸附率达到77.50%,腐植酸钠混合液用量为6.0 m L时对镁离子的吸附率达到83.60%,说明可以用腐殖酸钠对钙、镁离子进行处理,且增粘效果良好。

Analysis on Influence Factors of Formulating Polymer Solution With Sewage and Thickening Effect

According to the serious viscosity loss problem of preparing polymer solution with sewage in Daqing oilfield, effect of anion and cation on polymer solution viscosity was investigated, and improvement measures were proposed. The results show that the cation has great effect on polymer solution viscosity, and the order is:Fe2+>Fe3+>Mg2+(Ca2+)>Na+(K+). Preparation requirements are as follows: Na+, K+ contents less than 3 000 mg·L-1, preferably less than 1 000 mg·L-1,Ca2+ content less than 200 mg·L-1, Mg2+ content less than 100 mg·L-1. Fe2+, Fe3+contents should be strictly controlled because of their great effect. Anion has no effect on the viscosity loss of HAPM solution. Mg2+ is the main factor for the viscosity variation of polymer solution in the block. Humic acid sodium can be used to remove Mg2+ and Ca2+ in solution. And after ion adsorption treatment, solution thickening reaches 14.2 mPa· s. The adsorption effect of Ca2+ can reach 77.50 % when using 8.0 mL humic acid solution. Similarly, the adsorption effect of Mg2+ can reach 83.60 % when using 6.0 mL humic acid solution. The research shows that humic acid sodium can be used to adsorb Mg2+ and Ca2+, and it has great thickening effect.