Abstract: Oil recovery is enhanced by polymer flooding, which resulted in a large number of oil production sewage. It is fundamental and crucial to determine the composition of oilfield sewage, and then to dispose sewage efficiently for the sustainable and competent exploitation of oilfield. In this paper, in order to ascertain the content of each carrying materials component, the carrying samples were analyzed, which come from the settlement node, temperature node and the purification of oil buffer tank node. They were measured by the instrumental characterization methods of IR, SEM, acid soluble-calcining-atomic absorption and XRD. Comparative analysis methods were applied to compare the carrying material composition of each node and to analyze composition differences, as to provide basic information for oil extraction waste water treatment. The results showed that the main ingredient at settlement node was silicate; that at temperature node was calcium carbonate and magnesium carbonate; the purification sample at oil buffer tank node was organics. By the evaluation and improvement of treatment technology, the optimal operation parameters and dredging cycle were confirmed in high concentration polymer flooding produced fluid. Therefore, the efficiency of waste water treatment was improved and the cost of production was also reduced.

Key words: polymer flooding, oilfield sewage, treatment technology, dredging cycle

摘要： 聚合物驱油在提高采收率的同时也会产生大量的采油污水,确定油田污水的组成及时高效的处理污水是油田高效、可持续开发的基本前提。本文通过采用红外光谱、扫描电子显微镜、酸溶-煅烧-原子吸收法以及X射线衍射法等表征手段,对油田集输系统的沉降节点、提温节点以及净化油缓冲罐节点的携带物组成进行全面分析,确定其携带物各组分的含量。采用比较分析法,比较各节点处的携带物组成及含量,分析各物质组成特性、差异和控制因子,为高浓度聚合物驱油采出液处理技术提供基本根据。结果表明沉降节点携带物的主要成分是硅酸盐;提温节点携带物的主要成分是碳酸钙、碳酸镁;净化油缓冲罐节点携带物的主要成分是有机物。通过对油田高浓度聚合物驱油采出液处理工艺进行评价和改进,确定最佳运行参数和清淤周期,提高污水处理效率降低生产成本。

关键词: 聚合物驱油, 油田污水, 处理工艺, 清淤周期