The principal experience and practice in water flood enhanced recovery of very low and low-permeability oil reservoirs around Daqing oilfield, such as flexible waterflood pattern with high injection-to-production well ratio, synchronous water flood recovery, waterflood development with reservoir energy maintenance, as well as high injection-production ratio, early layering, high water quality standards and waterflooding along fractures, are summarized in detail, in this paper. Above-mentioned experience and...

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