关键词: 储层, 驱替速度, 采收率, 基质渗透率, 毛管力, 启动压力梯度

Abstract: On the basis of seepage flow mechanics,the impact of displacement rate on enhance oil recovery efficiency in different types of reservoir was investigated. The research results indicate that the increase of displacement rate of water-wetting layers in vertically heterogeneous and low-permeability reservoirs with kickoff pressure gradient is favorable for improving the oil recovery efficiency for one-dimensional homogeneous reservoir.As to water-wetting dual medium reservoirs,if the matrix permeability is very low,the proper reduction of displacement rate will sufficiently exert the exchange action between matrix and fracture caused by the difference of capillary pressures and enhance oil recovery.As to water-wetting vertically heterogeneous reservoirs and dual medium reservoirs with high-permeability matrix,the advantageous and disadvantageous actions of capillary pressure should be balanced.If the displacement rate is too hight or too low,the improvement of recovery efficiency will be influenced.So,an optimal displacement rate should be found out.

Key words: reservoir, displacement rate, oil-gas recovery efficiency, matrix permeability, capillary pressure, kickoff pressure gradient