关键词: 木钵延10油层, 水敏伤害, 驱替特征, 残余油, 非均质性, 驱油效率, 注水压力

Abstract: Three kinds of water drive experiments including the single model,double model and the combined natural sandstone micro-model were carried out.The oil displacement characters of water drive reservoir with water-sensititve damage and without water-sensitive damage were compared,and the oil displacement efficiencies of water drive under the above conditions were estimated.Compared with the formation water drive reservoir without water-sensitive damage,the injection pressure of water drive in the water-sensitive damaged formation was raised,and the heterogeneity of pore structure became stronger.The injected water resulted in bigger detours,and the displacement efficiency and the sweep efficiency decreased.The oil displacement ways of water drive were mainly piston-types under the two different conditions, and the types of residual oil were mainly clusters.The heterogeneity of porestructure,water sensitivity,injection pressure and the increasing pattern of injection pressure are the chief factors affecting oil displacement efficiency of water drive in Mubo Yan 10 reservoir.It is suggested that the heterogeneity of Mubo Yan10 reservoir should be studied furthermore,and the favorable measures for protecting this reservoir should be adopted in order to enhance oil recovery.The injection pressure should be gradually raised,and the recovery ratio of this reservoir should be enhanced possibly.

Key words: Mubo Yan10 reservoir, water-sensitive formation, displacement characters, residual oil, heterogeneity, oil displacement efficiency, injection pressure