Studies On Stability Of Polymer-flooding Produced Water

As an important technology in tertiary oil recovery, which can improve recovery efficiency greatly, polymer flooding technology play a significant role in maintaining oil production.But, for the features of serious emulsion, high suspended particles and oil content, it is very difficult to deal with.In this paper, the properties of SZ36-1 polymer-flooding produced water was diterminated. The effects of mineralization, pH and polymer content on the viscosity of aqueous phase were studied. The simulative polymer- flooding produced water was extracted gradiently by Petroleum ether and Chloroform into two Components. And the effect of polymer on those soluble parts was studied, and the effects on the four components and Elemental Analysis. The droplets form, Zeta, size distribution of simulative polymer- flooding produced water were studied. The effects of polymer contect on the simulative polymer flooding interfacial properties were studied.The study show that, the SZ36-1 polymer- flooding produced water was high viscosity, Zeta solid and oil co ntent. The viscosity of polymer- flooding produced water increases rapidly with the increasing of polymer contentration. The Petroleum ether and Chloroform extraction increase with the increasing of polymer contentration. The Petroleum ether and Chloroform extract increase quickly when the polymer contentration less than 75 mg?dm-3 and become slow when more than 100 mg?dm-3. The higher initial oil content, the greater the influence on Petroleum ether and Chloroform extraction. The polymer raise the oil slick oil Saturate, reduce resins and asphaltene, which reduce the exacted oil Saturate,raise resins.With the increasing of polymer concentration, The resin of oil slick and extracted oil was increasing, and the asphaltene was decreasing.In addition, the content of heteroatom was increasing, too. The average particle size and size distribution decreased as the ploymer content increased, and the Zeta potential increase as ploymer content increased. The polymer concentration on the interfacial tesion of component/methylbenzene-water was not very obvious. The polymer raise greatly the the dilatational modulus of simulative polymer-flooding produced water, especially dilatational viscosity.