Abstract: Polymer flooding sewage was used to dilute polymer solution XingBei oilfield. The low viscosity and poor stability made it unable to reach the injection requirement. A series experiments were made to study the problems. The results showed that Fe2+ and Na+ in the polymer flooding sewage were the major causes which reduced viscosity of polymer solution. Suspended solids and bacteria were the secondary factors. In order to effectively use polymer flooding sewage recycle dilute polymer solution and to make the oil field to achieve the purpose of economic and environmental development, the sewage quality was improved by oxygen exposure and putting flocculent. The viscosity of polymer solution was increased by 10.83 mPa·s compared with untreated polymer flooding sewage dilute, and viscosity loss rate was decreased from 28.4% to 12.16%, reaching the reinjection standard.

Key words: Polymer flooding sewage, Polymer solution, Influence factor, Viscosity, Sewage quality

摘要： 针对杏北油田利用聚驱污水稀释聚合物溶液黏度低、稳定性差、无法达到注入要求等问题,在室内进行了一系列实验研究。结果表明,聚驱污水中的Fe2+ 和Na+ 是导致聚合物溶液黏度降低的主要原因,悬浮物及细菌为次要因素。在此基础上,为了有效利用聚驱污水稀释聚合物溶液进行回注,使油田达到经济环保开发的目的,采用曝氧及在聚驱污水中加入絮凝剂沉降过滤的处理方法来改善其污水水质问题。处理后的聚驱污水稀释聚合物溶液与处理前的聚驱污水稀释的聚合物溶液相比,黏度上升了10.83mPa·s,黏损率由28.4%下降到12.16%,达到注入要求。

关键词: 聚驱污水, 聚合物溶液, 影响因素, 黏度, 污水水质