Abstract: As an important tertiary recovery technology, polymer flooding has obtained certain development achievement in Sanan development area of Daqing oilfield. But the surplus sewage exhausted from the polymer flooding has caused the waste of resource and the environmental pollution. The core flooding experiment which has diluted the polymer solution with the fresh water and the sewage was made to get this problem solved. According to the experimental results, the relationship between the concentration and viscosity of different molecular weight polymer was analyzed. Also, the injection capacity of the polymer solution with different molecular weight, permeability and concentration was analyzed. The injection capacity limit of the reservoir was divided according to the actual application. It has provided the reference for the screening of molecular weight and concentration of the polymer in actual production.

Key words: Polymer, Sewage, Core, Injection capacity

摘要： 聚合物驱油作为一项重要的三次采油技术,在大庆油田萨南开发区已取得一定的开发成果。但聚驱后产出的污水过剩外排,造成了资源浪费与环境污染。针对这一问题开展清水配制污水稀释聚合物溶液及清水配制清水稀释聚合物溶液的岩心注入实验,根据实验结果分析两种方式下不同相对分子质量聚合物溶液的质量浓度-黏度变化关系,并分析不同相对分子质量、渗透率及质量浓度下的聚合物溶液注入能力大小,根据现场实际应用状况划分了油层的注入能力界限,为实际生产中聚合物相对分子质量及质量浓度的筛选提供了参考。

关键词: 聚合物, 污水, 岩心, 注入能力