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在高含水饱和区与含油区相连的“底水”储层仍有数十亿bbl原油没有采出。一般来说，这类储层在一次采油期期间含水上升特别快，一次采油量很低。如果没有含水层，这些油藏最适合于进行注水开发，否则，传统的注水开发效果不佳；如果原油粘度高，效果就更差了。最近有人提出了几项改善此类油藏注水效果的技术与生产方法，这是本文论述的主题。
There are still billions of bbl of crude oil remaining in the “bottom water” reservoir connected to the oil-bearing zone in highly water-saturated areas. In general, such reservoirs have a particularly rapid rise in water cut during a recovery period and a low recovery of primary recovery. Without an aquifer, these reservoirs are best suited for waterflooding, otherwise traditional waterflooding is ineffective; if the viscosity of the oil is high, the effect is even worse. Recently, several techniques and production methods for improving the water injection effect of such reservoirs have been proposed, which is the subject of this article.