Although water pollution caused by pulp and paper industry has been decreased in recent years mainly due to the breakthrough progress of black liquor recovery technology of non-wood pulping.
The technique combined with profile modification, solves polymer breakthrough and has a good effect that recovery rate is increased by 15.28% at the stage of experiment.
该技术与调剖方法相结合解决了聚合物突进问题，试验达到阶段采收率增加15.28%的好效果。
3
The breakthrough of gas usually occur during low permeability reservoir development, that lead to recovery efficiency fall.