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利用电渗析装置处理油田污水,产出了V(淡水)∶V(浓水)=1∶1的淡水和浓水,配制了污水和浓水ASP体系溶液,绘制了2个ASP体系界面张力活性图.结果表明:与污水ASP体系相比,浓水ASP体系达到超低界面张力时,NaOH的质量分数大幅下移并且变宽(从污水ASP体系的0.70%~1.25%变为0.40%~1.00%),而表面活性剂质量分数范围略有缩小(从污水ASP体系的0.05%~0.40%变为0.10%~0.40%),Na2CO3不适合与ORS-41复配浓水ASP体系;在保持表面活性剂和聚合物质量分数与现场污水ASP体系配方(1350mg/L聚合物+0.3%ORS-41+1.0%NaOH)相同的情况下,浓水低碱(较低NaOH质量分数)ASP体系的NaOH用量比污水ASP体系的NaOH用量降低了0.4%,从而既减小了碱垢给ASP体系带来的不利影响,又充分利用了电渗析处理后的大量浓水;对比了2个ASP体系的流变曲线,发现浓水低碱ASP体系黏度略高于污水ASP体系的黏度;浓水低碱ASP体系采收率也能超过20%,具有良好的驱油效果,也能驱替各种残余油.
The electrodialysis unit was used to treat the sewage in the oilfield and fresh water and concentrated water with V (fresh water) = V (concentrated water) = 1 were produced. Sewage and concentrated water ASP system solutions were prepared, and the interfacial tension activity The results showed that when the concentrated ASP system reached ultra-low interfacial tension, the mass fraction of NaOH decreased sharply and widened from 0.70% -1.25% of the ASP system of sewage to 0.40% -1.00 %), While the range of the mass fraction of surfactant slightly reduced (from 0.05% to 0.40% of sewage ASP system to 0.10% to 0.40%), Na2CO3 is not suitable for ORS-41 complex concentrated water ASP system; The active agent and polymer mass fraction were the same as that of the ASP system of on-site wastewater ASP (1350mg / L polymer + 0.3% ORS-41 + 1.0% NaOH) The amount of NaOH was reduced by 0.4% compared with that of sewage ASP system, which not only reduced the adverse effect of alkali scale on ASP system but also made full use of a large amount of concentrated water after electrodialysis treatment. Compared the flow of two ASP systems The curves show that the viscosities of concentrated and low-alkali ASP system are slightly higher than those of sewage ASP system. The recovery of concentrated and low-alkali ASP system can exceed 20% , Has a good flooding effect, but also to displace a variety of residual oil.