环烷基石油磺酸钠胶束增溶及乳化携油作用分析及应用

Analysis and Application of Solubilization and Emulsification of Sodium Naphthenic Petroleum Sulfonate Micelle

为了揭示环烷基石油磺酸钠在砾岩油藏聚合物/表面活性剂二元复合驱中对提高采收率的影响,利用激光粒度仪和紫外分光光度仪测定了环烷基石油磺酸钠溶液的胶束尺寸和增溶量,利用微流控模型驱替实验和岩心驱替实验研究了环烷基石油磺酸钠乳化对提高采收率的影响。结果表明,与十二烷基苯磺酸钠、重烷基苯磺酸钠相比,同浓度下环烷基石油磺酸钠胶束增溶原油尺寸最大,增溶原油量最多,1 t环烷基石油磺酸钠溶液可极限增溶350 kg的原油。环烷基石油磺酸钠易与原油发生乳化,乳化后可增加驱油体系黏度,起到控制流度的作用,有利于提高采收率。在克拉玛依油田七中区二元复合驱现场试验中,根据岩心渗透率和含油饱和度的不同,通过改变表面活性剂的加量,调节驱油体系的乳化综合指数可大幅提高驱油效率。

In order to reveal the influence of sodium naphthenic petroleum sulfonate on enhanced oil recovery(EOR)of polymer/surfactant binary compound flooding in conglomerate reservoir,the laser particle size analyzer and ultraviolet spectrophotometer were used to determine the micelle size and solubilization amount of sodium naphthenic petroleum sulfonate.The emulsification effect of sodium naphthenic petroleum sulfonate on EOR was studied by microfluidic model displacement experiment and core flooding experiment.The results showed that the size and amount of solubilized crude oil in sodium naphthenic petroleum sulfonate solution were the largest under the same concentration,compared with sodium dodecyl benzene sulfonate and sodium heavy alkyl benzene sulfonate.The limited solubilization of crude oil was 350 kg in 1 t sodium naphthenic petroleum sulfonate solution.Sodium naphthenic petroleum sulfonate was easy to emulsify with crude oil.After emulsification,the viscosity of oil displacement system was increased and the fluidity was controlled,which was beneficial to EOR.In the field test of binary compound flooding in the seventh middle area of Karamay oilfield,according to the difference of core permeability and oil saturation,the oil displacement efficiency could be greatly improved by adjusting the emulsification degree of oil displacement system when the dosage of surfactant was changed.