In the process of polymer flooding in Daqing oil field, because of the high de-gree of mineralization of oil bearing wastewater, it will cause the degradation of polymer, so it is generally used to prepare polymer solution with low salinity water. In recent years, with the increasing scale of polymer flooding development,the low salinity water consumption in-creased significantly, resulting in the imbalance of oil production and water injection, the emergence of sewage efflux. From 2012, the second oil production plant began the study of the preparation of the polymer technology for reducing the degree of oil production, and small scale laboratory experiments and field tests were conducted in the field test. In 2012, a 5 000 m3 low salinity oil bearing wastewater treatment station was built,which was used to sep-arate the ion from oily wastewater by lon exchange membrane process.Using low salinity wa-ter to replace the water to dilute the polymer,can reduce the cost of water about 5.9 yuan/m3, and annual cost sauhgs about 978 million.%在大庆油田聚驱开发过程中,由于采出的含油污水矿化度高,会造成聚合物降解,因此一般采用低矿化度清水配制聚合物溶液.随着聚驱开发规模不断扩大,低矿化度清水用量大幅度增加,导致含油污水采注失衡,出现污水外排现象.为此,开展了含油污水降矿化度配制聚合物工艺技术的研究.先后进行了室内实验、现场小试、现场中试等试验研究,并于2012年新建设1座日产5 000 m3低矿化度含油污水试验站,采用超滤膜+离子交换膜工艺技术,将离子从含油污水中分离,使处理后的污水水质满足配注聚合物的用水标准.对含油污水进行改性后,保证了含油污水配制的聚合物溶液黏度不低于清水.采用低矿化度污水替代清水稀释聚合物,可减少清水费用5.9元/m3,年节约成本978万元.
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