Abstract
Characterization of rheological behavior of alkali-surfactant-polymer (ASP) solution and oil emulsion is difficult, due to the complex chemical components and various physiochemical reactions with oil during chemical flooding. Through rheological experiments of ASP and crude oil emulsion, this paper presents the studies on influencing factors of rheological behavior, including interfacial tension, polymer and water cut, and discusses the stability mechanism of ASP and crude oil emulsion. The relationships among viscosity, interfacial tension, water cut and sheer rate were built through fitting the experimental data. The model and calculation can be used to more accurately simulate the ASP flooding in oil reservoirs.
Highlights
Alkali-surfactant-polymer (ASP) solution flooding has been used in oil reservoir developments since late 1980s, and oil recovery can be greatly enhanced because of the synergistic effect of three chemical flooding [1,2]
1876-973X/14 concentrations ranging from 10% to 70% was obtained using capillary tube data; it was found that emulsions with oil concentrations less than 50% behaved like Newtonian fluids, while those with concentration greater than 50% behaved like pseudo plastic fluids
His results showed that the change in emulsion rheology in a porous medium had an overall trend similar to that in a viscometer for the shear rates of interest; rheological behavior was found to be very different for the emulsion with different chemicals
Summary
Alkali-surfactant-polymer (ASP) solution flooding has been used in oil reservoir developments since late 1980s, and oil recovery can be greatly enhanced because of the synergistic effect of three chemical flooding [1,2]. Emulsions are playing a more and more important role in oil recovery as they are found to occur in most enhanced oil recovery processes and are involved in certain modes of crude oil transportation [5] They can be used in secondary recovery as blocking agents to improve water flooding performance in layered reservoirs or under bottom-water conditions [6]. Khambharatana [5] investigated emulsion theologies and droplet captures for both caustic and surfactant emulsions flowing through Berea sandstone and Ottawa sand packs His results showed that the change in emulsion rheology in a porous medium had an overall trend similar to that in a viscometer for the shear rates of interest; rheological behavior was found to be very different for the emulsion with different chemicals. It is important to study the emulsion’s flow behavior under the influence of polymer, surfactant and alkali simultaneously, which is the main subject of the present paper
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