磺酸型含氟表面活性剂的表、界面活性和润湿性行为

Surface and Interfacial Activities and Wetting Behavior for a Surfactant Containing Fluorine and a Sulfonic Group

为了增加超低渗透砂岩油藏的水相渗透率和降低毛细管压力,达到降压增注的目的,以1H,1H,2H,2H-全氟癸醇和2-氯乙基磺酸钠为原料制备了磺酸型含氟表面活性剂SOE。将SOE与辛基酚聚氧乙烯醚-10(OP-10)或十二烷基苯磺酸钠(SDBS)复合,研究了SOE溶液和复合体系的表面张力、油水界面张力和接触角。结果表明,SOE的表面活性和水相非润湿性显著优于碳氢表面活性剂,油水界面活性明显优于全碳氟表面活性剂。在30℃时,SOE在纯水和30.0 g/L NaCl溶液中的临界胶束浓度(ccmc)均为0.4 g/L;在ccmc时,SOE盐水溶液的油水界面张力为2.80 mN/m,接触角为75.63°。SOE能与碳氢表面活性剂发生良好的协同效应,0.08 mmol/L SDBS的加入可使0.2 g/L SOE盐水溶液的油水界面张力从3.71 mN/m降至0.44 mN/m,而体系润湿角的变化较小,仍能达66.42°,且SOE的用量明显降低。在盐水溶液中,SOE/SDBS复合体系的界面活性明显强于SOE/OP-10。SOE/SDBS复合体系可用于超低渗透油藏的降压增注。图9参12。

Novel surfactant SOE containing fluorine and a sulfonic group was synthesized using 1H,1H,2H,2H-Perfluoro-1-decanol and sodium 2-chloroethanesulphonate in order to increase the permeability of aqueous phase and decrease the capillary pressure in ultra-low permeability sandstone reservoirs.This aimed to reduce injecting pressure and increase the amount of injected water.Moreover,SOE was combined with octylphenol polyoxyethylene(10)ether(OP-10)and sodium dodecyl benzene sulfonate(SDBS)respectively.The surface tension,oil-water interfacial tension and contact angle of SOE solution and the composite systems were investigated.The results showed that the surface activity and water non-wettability of SOE were obviously better than those of hydrocarbon surfactant and the interface activity of SOE was remarkably better than that of perfluorinated surfactant.The critical micelle concentration of SOE was 0.4 g/L in water or 30 g/L NaCl solution at 30°C.The oil-water interfacial tension of SOE solution was 2.80 mN/m,and the contact angle was up to 75.63°for this brine at this temperature.The synergism between SOE and hydrocarbon surfactant was good.When 0.08 mmol/L SDBS was added to 0.2 g/L SOE brine,the oil-water interfacial tension decreased obviously from 3.71 to 0.44 mN/m,and the contact angle changed slightly and remained 66.42°.Moreover,the amount of SOE would be decreased remarkably.The oil-water interface activity of SOE/SDBS composite system was markedly better than that of SOE/OP-10 in the brine.Therefore,the SOE/SDBS composite surfactant could be applied in the depressurization and injection augment for ultra-low permeability reservoir.