Later on, it was found that many kinds of water-soluble polymer had the ability of disproportionate permeability reduction (abbr. DPR), meanwhile, it was also discovered that some metallic ion crosslinked polymer could get better DPR.

• 随着研究的深入，人们发现许多水溶性高分子溶液具有这种不等比例降低油水相渗透率（DPR，Disproportionate Permeability Reduction）的功能，同时，人们还发现，利用一些金属离子交联高分子溶液，可以获得更好的DPR效果。