摘要：

随着油田注水开发的深入,油田采出污水水质变化幅度和处理难度不断增加,采用常规处理难以达到油田注水标准,严重影响了油田的正常生产。以陕北某低渗透油田采油污水为研究对象,采用斜板混凝沉降-过滤法对该采油污水进行处理研究。研究结果表明,采用无机聚合物絮凝剂WXT-766与有机阳离子助凝剂WT-831复配使用具有很好的处理效果。在这种处理工艺条件下,可使处理后污水含油质量浓度降至5.0 mg/L、悬浮物质量浓度降至3.0 mg/L、悬浮物粒径<2.0μm,达到了低渗透油藏注入水水质指标。

关键词: 采油污水, 污水处理, 混凝沉降法

Abstract:

With the deepened development of oil field water injection,the changing range of oilfield extracted wastewater quality and the treatment difficulty are increasing.It is very difficulty to reach the oilfield water injection standard by using traditional treatment methods which affect the oilfield normal production seriously.Taking the example of oil extraction wastewater with low permeability in an oilfield in northern Shaanxi as research target,the sloping plank coagulation sedimentation-filtration method has been used for treating the oil extraction wastewater.The result shows that the method which uses inorganic polymer flocculent WXT -766 combining with organic cationic coagulation agent WT-831 has very good treating effect.Under this technical conditions,the oil content of the treated wastewater can be lowered to 5.0 mg/L,the suspended matter can be lowered to 3.0 mg/L,and the grain size of suspended matter is smaller than 2.0 μm,reaching the water injection quality indexes of oil with low permeability.

Key words: oil extraction wastewater, wastewater treatment, coagulation sedimentation method

中图分类号: 

• X703.1