After polymer flooding ,recovery ratio is raised 10%,but 50% of geological reserves still remains in original reservoirs. which needs to be produced by other methods for EOR.

• 聚合物驱通常可以提高采收率约10%25，它之后仍然有的50%25的原油残留地下，还需要采用其它方法，以进一步提高采收率。