Experimental Study Of Microscopic Physical Analog On Foam Multisystem

Foam combined flooding is a new EOR technique which was developed on the basis of alkaline-surfactant-polymer combined flooding method.which inject the gas according to a certain way at the same time inject the ASP, use of the ASP has ultra-low interfacial tension,Higher viscosity, as well as the foam has a higher degree of control fluidity, effectively blank off high permeability zone, not only amplify the swept volume and increase cleaning efficiency. A great quantity of interior core displacement experiments show that foam flooding enhance recovery of original geological reserves of 8%～10% than ASP.The original adopt microscopic model for displacement experiments, through the image acquisition system transform process the images flooding into the computer's numerical signal, and using image analysis technology studies the mechanism of oil displacement on foam multisystem. the original has discussed deeply several aspects as follows:Firstly, Ross-Miles method used for foaming performance test, studies various factors that affecting the bubble foaming.Secondly,analysis of oil displacement on foam multisystem, as well as the oil displacement and the effect of displacement about various types of oil after water flooding. the results show that the foam multisystem can increase the area of macro-sweep area,amplify micro-swept volume, And shows a better effect of displacement to various types of irreducible oil, thereby improve the oil displacement efficiency.Thirdly, on the basis of micro-flooding experiment,studies different gas fluid ratio foam multisystem, as well as comparative study of different methods into the optimization, the results show that the displacement of the bubble forming liquid better quality when Gas liquid ratio is 3: 1, foam can enter and effectively blank off high permeability zone, so that more fluid displacement in shunt into the low-permeability layer, adjust the entry profile, simultaneously injected into the gas-liquid displacement effect significantly better than alternative injection methods.Finally, studies the effects of different permeability reservoir flooding characteristics of the bubble, the results show that Foam Multisystem have a better effect profile permeability for different reservoir.