Based on the results of sharp decline in water cut, increase in the oil production rate, and a 5% increase in the recovery factor obtained in a polymer flooding pilot test in a reservoir with positive rhythm in Daqing Oil Field, this paper discusses the favorable conditions for polymer flooding in this oil field, including low reservoir temperature, low salinity and low content of high valence ions both in the formation and injection water, and relatively high oil saturation left in the reservoir after water flooding… etc.; and gives both theoretic and practical basis for a possible extensive application of polymer flooding in Daqing Oil field.

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