Current situation and prospect for 　oil recovery techniquesafter polymer flooding in Daqing Oilfield

There are still about 50% geologic reserves existing in the oil zones after polymer flooding. In view of this, based on analyzing the characteristics of oil reservoirs and the technical difficulties facing oil recovery after polymer flooding, the current status of the oil recovery technique after polymer flooding is introduced in detail. It consists of the EOR technology, the fine plugging control technology, the fine transformation technology, and the technology tapping the residual oil in horizontal wells. All techniques related to the four technologies are systematically analyzed and their application is evaluated as well. Finally, according to the requirement and urgency of the development of the oil recovery technology, on the basis of the application of the currently used techniques, corresponding technical problems are proposed, mainly including eight techniques matching to such three aspects as the high-efficiency flooding control, the fine plugging control, and the tapping of potentials of horizontal wells.