| With the development of world industry and economy, the energy is getting hard up. The consumption and production of oil attract human beings'sights. Daqing oilfield have been exploited for about 50 years, the oil production is cutting down. The proportion of water is increasing in liquor extraction. Decreasing water proportion in liquor extraction and enhancing the oil recovery is the main goal and important work of the Daqing oilfield. ASP method posses the superiority that other methods of EOR can't come up to. But the complex flooding mechanism of ASP haven't been cleared about still. The thesis proceed with phase study. Phase behavior and phase character be mainly studied in the thesis as follows: phase appearance, phase volume, phase viscosity, oil/water interface tension, the surfactant concentration of each phase. Mixed Crude oil with A/AS/ AP/ASP to emulsified in constant temperature. All characteristic quantities be measured in the lab with the technique as follows: measure the surfactant content in varied phase with titration, measure the oil/water interface tension with lauda Drop-volume-tensionmeter or Texas 500 interface tensionmeter, measure the varied phase viscosity with RS-150 rheometer, observe varied phase microstructure with Leica optical microscope. Study shows: only two phases appear when the surfactant concentration is below CMC, with the increase of surfactant concentration, three or more phases appear, the volume of middle phase increasing till oil and water totally be emulsified to one phase . Three or more phases still to come when the surfactant concentration enhanced again. In that process, the interface tension enhanced continuously, from below 10-3mN/m till beyond 10-3mN/m.The same trend appears in phase viscosity in both middle phase and downer phase, the viscosity in middle phase is larger than that of the downer phase. Finally, exploratory investigation of combination flooding mechanism and EOR mechanism in ASP is developed based on microscope image.
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