Emulsification is one of the important mechanisms of surfactant flooding. To improve oil recovery for low permeability reservoirs, a highly efficient emulsification oil flooding system consisting of anionic surfactant...Emulsification is one of the important mechanisms of surfactant flooding. To improve oil recovery for low permeability reservoirs, a highly efficient emulsification oil flooding system consisting of anionic surfactant sodium alkyl glucosyl hydroxypropyl sulfonate(APGSHS) and zwitterionic surfactant octadecyl betaine(BS-18) is proposed. The performance of APGSHS/BS-18 mixed surfactant system was evaluated in terms of interfacial tension, emulsification capability, emulsion size and distribution, wettability alteration, temperature-resistance and salt-resistance. The emulsification speed was used to evaluate the emulsification ability of surfactant systems, and the results show that mixed surfactant systems can completely emulsify the crude oil into emulsions droplets even under low energy conditions. Meanwhile,the system exhibits good temperature and salt resistance. Finally, the best oil recovery of 25.45% is achieved for low permeability core by the mixed surfactant system with a total concentration of 0.3 wt%while the molar ratio of APGSHS:BS-18 is 4:6. The current study indicates that the anionic/zwitterionic mixed surfactant system can improve the oil flooding efficiency and is potential candidate for application in low permeability reservoirs.展开更多
为揭示不同结构表面活性剂的性能特征,对棕榈酸二乙醇胺聚氧乙烯醚磺酸盐钠(PDES)和油酸二乙醇胺聚氧乙烯醚磺酸盐钠(ODES)两种磺酸盐型阴-非离子表面活性剂的表面活性性能进行了研究。结果表明:DPES和ODES溶液的临界胶束浓度ccmc分别为...为揭示不同结构表面活性剂的性能特征,对棕榈酸二乙醇胺聚氧乙烯醚磺酸盐钠(PDES)和油酸二乙醇胺聚氧乙烯醚磺酸盐钠(ODES)两种磺酸盐型阴-非离子表面活性剂的表面活性性能进行了研究。结果表明:DPES和ODES溶液的临界胶束浓度ccmc分别为1.14×10-3、6.67×10-4mol/L,相对应的表面张力γcmc分别为38.40和35.68 m N/m;随着温度和矿化度升高,ccmc逐渐减小,γcmc逐渐降低。DPES和ODES的Krafft点均低于常规阴离子表面活性剂,分别为17℃和14℃,浊点均大于110℃,溶解性好,具有优良的抗高温性能。质量分数0.5%的PEDS和ODES在Na+浓度为100 g/L或Ca2+浓度为4 g/L的矿化水溶液中均未出现沉淀,表现出了极强的耐盐性能。展开更多
基金financially supported by National Natural Science Foundation of China(No.22302229)Beijing Municipal Excellent Talent Training Funds Youth Advanced Individual Project(No.2018000020124G163)。
文摘Emulsification is one of the important mechanisms of surfactant flooding. To improve oil recovery for low permeability reservoirs, a highly efficient emulsification oil flooding system consisting of anionic surfactant sodium alkyl glucosyl hydroxypropyl sulfonate(APGSHS) and zwitterionic surfactant octadecyl betaine(BS-18) is proposed. The performance of APGSHS/BS-18 mixed surfactant system was evaluated in terms of interfacial tension, emulsification capability, emulsion size and distribution, wettability alteration, temperature-resistance and salt-resistance. The emulsification speed was used to evaluate the emulsification ability of surfactant systems, and the results show that mixed surfactant systems can completely emulsify the crude oil into emulsions droplets even under low energy conditions. Meanwhile,the system exhibits good temperature and salt resistance. Finally, the best oil recovery of 25.45% is achieved for low permeability core by the mixed surfactant system with a total concentration of 0.3 wt%while the molar ratio of APGSHS:BS-18 is 4:6. The current study indicates that the anionic/zwitterionic mixed surfactant system can improve the oil flooding efficiency and is potential candidate for application in low permeability reservoirs.
文摘为揭示不同结构表面活性剂的性能特征,对棕榈酸二乙醇胺聚氧乙烯醚磺酸盐钠(PDES)和油酸二乙醇胺聚氧乙烯醚磺酸盐钠(ODES)两种磺酸盐型阴-非离子表面活性剂的表面活性性能进行了研究。结果表明:DPES和ODES溶液的临界胶束浓度ccmc分别为1.14×10-3、6.67×10-4mol/L,相对应的表面张力γcmc分别为38.40和35.68 m N/m;随着温度和矿化度升高,ccmc逐渐减小,γcmc逐渐降低。DPES和ODES的Krafft点均低于常规阴离子表面活性剂,分别为17℃和14℃,浊点均大于110℃,溶解性好,具有优良的抗高温性能。质量分数0.5%的PEDS和ODES在Na+浓度为100 g/L或Ca2+浓度为4 g/L的矿化水溶液中均未出现沉淀,表现出了极强的耐盐性能。
