关键词: 聚合物驱, 　段塞, 　采收率, 　含水率

Abstract: In order to improve the displacement effect of lh25 million macromolecule polymer, the oil displacement experiments of single slug and multiple slug were carried out. Through the experiments, the slug combination and injection method of 0.2、0.6、0.2 PV(1 800、1 500、1 200 mg/L）were determined in the test area of zone A. Compared with the conventional 25 million polymer block, the experimental area in zone A had the same increase rate of injection pressure, but the oil reservoir, especially the thin differential layer, had better injection and production capacity. Under the same PV injection, the water cut of the production well decreased more and the effect was faster, which was better than the injection of 25 million polymer blocks. There are differences in water cut rate, effective time and effective ratio of producing classified wells, and the indexes of type III wells are better than those of type I and II wells.

Key words: Polymer flooding, Slug, Recovery factor, Water cut