论文部分内容阅读
从水驱后的残余油图象与三元复合体系驱替后的图象对比及残余油驱替过程入手，深入剖析了残余油在水驱和三元复合驱过程中的受力变化情况，阐明了各种残余油被三元复合体系驱替的内在原因：三元复合体系使油水之间界面张力降低和介质润湿性改变而引起的毛细管力和粘附力大大降低，甚至使毛细管力由阻力变为驱油动力，是三元复合驱驱替柱状残余油和簇状残余油的主要机理；三元复合体系降低粘附力和内聚力的作用是驱替膜状残余油的内在因素；三元复合驱降低内聚力使孤岛状残余油在下游端拉出油丝、拉断、逐渐分散成较小油滴，变小后的油珠容易通过细小孔喉，最终将孤岛状残余油驱走。
Starting from the image contrast after the water flooding and the displacement of the ternary composite system and the residual oil displacement process, the force variation of the residual oil in the process of water flooding and ternary compound flooding was analyzed in depth. Clarified the inherent reason why all kinds of residual oil are displaced by ternary system: the ternary compound system greatly reduces the capillary force and adhesion caused by the decrease of interfacial tension between oil and water and the change of wettability of the medium, and even makes the capillary force It is the main mechanism that ternary compound flooding displaces columnar residual oil and cluster-like residual oil from resistance to oil displacement. The effect of reducing the adhesion and cohesion of ternary composite system is the intrinsic factor to displace the residual oil. The ASP flooding reduces the cohesion so that the island-shaped residual oil pulls out the oil filaments at the downstream end and pulls off and gradually disperses into smaller oil droplets. The smaller oil droplets easily pass through the small pore throats and finally the island-shaped residual oil is driven away .