| Alkali/surfactant/polymer (ASP) flooding is mixture of injective water, surfactant, alkali and polymer. The injection of chemical agent can increase the viscosity of the injective water and decrease oil and water interface tension. ASP flooding is does not only improving the fluid ratio of displacing phase and displaced phase, but also enlarging the efficiency of displacing oil. Forerunner and industry polite test of Daqing oilfield ASP flooding show that ASP flooding is an effective method to enhance oil recovery, and also is an important technique safety of oilfield durable development. But in the progress of application and polite test of ASP flooding, these exposes technique puzzles that limit the polite test effect of ASP flooding and further application at a large scale, which are the injection and production equipment erosion, encrustation and the emulsification of producing water. So, there is very important practical significance to decrease and eliminate erosion and encrustation problems in the progress of ASP flooding. SJT-B is a new kind of chemical agent that using decreasing erosion and encrustation proof, whose effect of decreasing erosion and protecting encrustation and decreasing interface should be verified by the experimental results. Making use of the instrumental analysis method, the paper does some system study on encrustation proof, decreasing the interface tense of SJT-B agent and the effect of displacing oil. The results show that the effect of SJT-B is obvious and some index have reached trade standard."Surfactant, SJT-B auxiliary agent and polymer"ASP flooding and the oil of Plant two in the Daqing Oilfield can reach the ultra low interface tense, and have the characteristics of decreasing the scope of concentration of interface tense is wide, the scope is large and the stability is better. The property evaluation of encrustation proof and decreasing interface tense of SJT-B provide the experimental dependence for polite application. |
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