关键词: 三元复合驱, 提高采收率, 压力场, 饱和度场, 宏观渗流机理, 物理模型

Abstract: The fluid flow mechanism in porous media for increasing swept efficiency and displacement efficiency in the alkali-surfactant-polymer (ASP) flooding was investigated by measuring production performance,pressure and saturation distribution with pressure transducers and saturation measuring probes in a 3-D physical model of vertical heterogeneous reservoir.In a vertical heterogeneous reservoir,the resistance increased,the pressure went up and the flow direction changed under the physical and chemical actions of adsorption, retention and emulsion of ASP agents in the reservoir.The ASP agents changed the fluid flow direction from the main stream to the two sides of non-main stream of remaining oil region and displaced the remaining oil in the plane direction to increase the plane swept efficiency.The ASP agents flowed from high-permeability region to the middle-low permeability regions in vertical direction,which increased the vertical swept efficiency.The ASP flooding not only displaced the residual oil in the main stream and high-permeability regions,but also displaced the remaining oil in the non-main stream and middle-low permeability regions by increasing swept efficiency.The ASP flooding can greatly enhance oil recovery by increasing the swept efficiency and displacing efficiency.

Key words: alkali-surfactant-polymer flooding, enhanced oil recovery, pressure distribution, saturation distribution, fluid flow mechanism, physical model