混合磺酸盐表面活性剂/聚合物二元驱油体系

Mixed sulfonate surfactant/polymer binary oil drive system

针对大庆油田二元复合驱,制备的煤制烯烃基长链烷基二甲苯磺酸盐(M_(r)≈402)、腰果酚磺酸盐(M_(r)≈404)单独配制的二元复合驱油体系油水界面张力均不能完全达到10-3 mN/m超低数量级。将2种磺酸盐按照不同质量比进行复配(分别记作A、B、C、D、E、F、G、H、L),其中只有F为4∶6混合时,界面张力达到2.7×10^(-3)mN/m超低数量级,再按照二组分F与脂肪醇聚氧丙烯聚氧乙烯醚磺酸盐按照不同质量比进行复配(分别记作M、N、P、Q、R),其中P为94∶6最好且综合效果远好于二组分F,研究了三组分P与聚合物组成的二元复合体系的界面张力和黏度稳定性、抗吸附性、乳化性、驱油效果。结果表明,t=45℃、t=90 d测试中,二元体系黏度保留率超过80%;二元体系界面张力均为10^(-3)mN/m超低数量级,界面活性稳定性好;抗吸附性能(5次)及乳化性能均能满足油田矿场实际应用要求;原油采收率超过32%,其中二元驱油体系贡献率大于20%。

For the binary composite drive in Daqing oilfield,the oil-water interfacial tension of the binary composite drive system prepared from coal-based olefin-based long-chain alkyl xylenesulfonate(M r≈402)and cashewol sulfonate(M r≈404)each formulated separately could not fully reach the ultra-low order of magnitude of 10-3 mN/m.These two sulfonates were compounded in different mass ratios(recorded as A,B,C,D,E,F,G,H,L,respectively),of which only the interfacial tension reached 2.7×10^(-3)mN/m ultra-low order of magnitude when F was mixed 4∶6,and then compounded in different mass ratios(recorded as M,N,P,Q,R,respectively)with the two components F and fatty alcohol polyoxyalkylene ethoxylate sulfonates,of which P was 94∶6.The interfacial tension and viscosity stability,anti-adsorption,emulsification and oil repellent effects of the binary composite system composed of three components P and polymer were studied.The results showed that the viscosity retention rate of the binary system was more than 80%at 45℃and 90 d.The interfacial tension of the binary system was 10^(-3) mN/m of ultra-low order and the stability of interfacial activity was good.The anti-adsorption performance(5 times)and emulsification performance could meet the practical application requirements of oilfield mine.The recovery of crude oil was improved by more than 32%,of which the binary oil repellent system contributed more than 20%.