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The reservoir heterogeneity of Suizhong 36-1 oilfield is very obvious, the average permeability reaches 2000mD. Long-term water injection development leads to serious water channeling in high permeability layers, resulting in ineffective circulation of injected water and reduction of oil recovery. It is urgent to form an effective EOR method. In this paper, the oil displacement effect of different combination slugs including polymer gel, polymer microsphere and surfactant is evaluated by means of conformance control and chemical flooding. Three-layer heterogeneous 3-D plate model is used for oil displacement experiment. The experimental results show that the combination slug sequentially composed of polymer gel, polymer microspheres and surfactant have the best oil displacement effect with the oil recovery increment by 21.2% after the first water flooding. In addition, using the best slug combination for two rounds flooding, the recovery factor increased by 28.2% compared with the first water flooding. This paper provides some new insights for enhanced oil recovery in strong heterogeneity reservoir.

The performance prediction of a micellar polymer flood in a complex reservoir requires an accurate model that represents the reservoir features, chemical properties, and displacement mechanisms that affect the flood performance. First, this article provides a comprehensive comparison of micellar polymer flood with other recovery techniques, such as waterflooding, polymer flooding, and surfactant flooding. Then, the article states the successful evidences of micellar polymer flooding in a highly heterogeneous oil field in Vietnam. The results indicate that waterflooding is only efficient for homogeneous reservoirs and it is necessary to apply chemical flooding for highly heterogeneous reservoirs in tertiary hydrocarbon recovery processing. A significant value of increasing oil recovery is a reliable evidence for the worth of micellar polymer flooding. [ABSTRACT FROM PUBLISHER]