石油磺酸盐在油水两相分配规律研究

Research on Distribution Coefficient of Petroleum Sulfate in Oil and Water Phase

表面活性剂在油水两相的分配系数是驱油体系的重要参数,在驱替过程中影响油水界面张力、色谱分离程度等。由于表面活性剂的两亲特性,与油水两相接触后,在油水界面聚集,最终达到分配平衡。研究了弱碱三元复合驱中石油磺酸盐表面活性剂在油水两相的分配规律,实验结果表明:对于单一石油磺酸盐体系、聚合物和石油磺酸盐的二元体系,随着石油磺酸盐浓度增加,分配系数逐渐降低;当溶液中有Na2CO3时,随着石油磺酸盐浓度增加,分配系数逐渐增大;石油磺酸盐浓度一定时,随着油水比例增加,石油磺酸盐在油水两相中的分配系数增大。

Surfactant partition coefficient in oil and water phase is a key parameter of the flooding system,and it affects the interfacial tension of phase and chromatographic separation.By the amphiphilic properties of surfactants,surfactants gathered at the oil-water interface after contact with water,ultimately the distribution achieves balance.By studying the distributive regulation of petroleum sulfonate surfactants used for ASP flooding,the impact factor of oil-water phase distribution is determined.Experimental results showed that for the single petroleum sulfonate system and ASP flooding system,with the concentration of petroleum sulfonate increase,the oil-water distribution coefficient of the petroleum sulfonate gradually reduced.When the solution with the petroleum sulfonate has Na2 CO3,with the concentration of petroleum sulfonate increase,the oil-water distribution coefficient of the petroleum sulfonate gradually increases.At certain concentrations,with the oil-water proportion increased,the oil-water distribution coefficient of the petroleum sulfonate gradually increases.