Research On Interfacial Characteristic Of Mono-System, Binary System And ASP System

The mechanism research on chemical flooding enhances oil recovery involves the fields of rheological property, interfacial behavior and so on. Many research results show that the interfacial behavior of chemical flooding system directly affects the driving process and the displacement efficiency. Through the systematic study on interfacial behavior, the formation mechanism, structural feature and driving ability of interfacial film can be understood deeply, the description of physical and chemical phenomenon is developed, microcosmic oil displacement mechanism is fully interpreted and the development of oil displacement agents is accelerated. The study on interfacial behavior redounds to selecting oil displacement agents and designing reasonable method of EOR/IOR.The interfacial characteristic of polymer solution, betaine surfactant solution, alkali solution and oil, the interfacial characteristic between combination oil system and oil and the rheological property of driving oil system are studied. The mathematical model of interfacial characteristic, interfacial tension, London-van der Waals force, electrostatic double-layer force, interfacial diffusion coefficient and the characteristics of continuous phase and dispersed phase and coalescence time is set up using convex film model in the process of chemical flooding. The research results show that concentration, molecular weight, temperature and salinity have the effect on the interfacial viscosity of the polymer, surfactant and alkali solution. The interaction of polymer, surfactant and alkali has the obvious effect on interfacial characteristic and viscosity and the influence and effect mechanism are related with polymer, surfactant and alkali concentration. The concentration variety of alkali has the effect on the interfacial viscosity of the ASP system. The research results show that interfacial viscosity, interfacial tension, electrostatic double-layer force, interfacial diffusion and London-van der Waals force have the action on drop coalescence. The coalescence time is longer with the increase of interfacial viscosity. The coalescence time is shorter with the increase of interfacial diffusion and interfacial activity coefficient. The electrostatic double-layer force has the inhibitory action on drop coalescence. The London-van der Waals force has the stimulation action on drop coalescence. When the distance of two drop is longer, the London-van der Waals force plays the leading role. When the distance of two drop is shorter, the electrostatic double-layer force plays the leading role.