ASP三元复合驱用石油磺酸盐的组成分析及界面活性研究

Composition and Interfacial Activity of Petroleum Sulfonate Used in ASP Flooding System

为了明确不同结构的ASP三元复合驱用石油磺酸盐的界面活性,将新疆油田三元复合驱用的石油磺酸盐KPS工业品提纯、分离出了极性从大到小的H、C、B三个组分。采用核磁、质谱等分析方法分析了KPS及其组分的分子结构以及相对分子质量分布,考察了KPS及其组分在不同的表面活性剂质量分数、碱质量分数和盐质量分数下的界面活性。结果表明,H组分亲水性强,低质核比的分子占比高,分子结构以芳烃为主;B组分亲水性差,高质核比的分子占比高,分子结构以直链烷烃为主;C组分的亲水性较好,相对分子质量分布介于H组分和B组分之间,分子结构以支链烷烃为主。在表面活性剂质量分数0.1%~0.5%、Na_2CO_3质量分数0.2%~2.0%的条件下,C组分呈现出良好的界面活性,Na_2CO_3质量分数1.2%、C组分质量分数0.3%、聚合物质量分数0.18%时,油水界面张力最低,达10^(-4)mN/m数量级。在NaCl质量分数0.2%~2.0%(聚合物质量分数0.18%)的条件下,C组分同样呈现出良好的界面活性,表面活性剂质量分数为0.3%时,油水界面张力最低可达10^(-3)mN/m。

In order to make sure the interfacial activity of different components of petroleum sulfonates,component H,C and B with different polarity were separated from purified KPS,which was used in Xinjiang oilfield. The molecular structure,weight distribution of KPS and components were analyzed by 1H-NMR and MS,and the interfacial activities of KPS and components in different concentration of surfactant,alkali and salt were investigated. The results showed that the H component consisted essentially of molecules with low nuclear ratios and the molecular structure was dominated by aromatics. The B component consisted essentially of molecules with high nuclear ratios and the molecular structure was dominated by straight chain alkanes. The C component consisted essentially of molecules with high nuclear ratios and low nuclear ratios and the molecular structure was dominated by branched alkanes. The C component had the best surface activity at different surfactant concentrations of 0.1%—0.5% and the weak alkali concentrations of 0.2%—2.0%. The interfacial tension between the ASP system,composed of 1.2% weak alkali,0.3% C component and 0.18% polymer,and the crude oil could reach 10^-4 mN/m. In addition,the C component had better interfacial ability at the concentration of salt concentrations of 0.2%—2.0%. The interfacial tension could reach 10^-3mN/m.