Abstract

In order to provide valuable information for the separation process of petroleum sulfonate and the mixing rule of petroleum sulfonate components, the methods of water extraction and column chromatography were used to separate non-sulfonated oil and petroleum sulfonate components, respectively. The effects of oil separation rate, source of crude oil, and composition of petroleum sulfonate on oil–water interfacial tension (IFT) were investigated. The results showed that the oil–water IFT of petroleum sulfonate products for oil displacement was affected by many factors. The presence of a small amount of non-sulfonated oil in petroleum sulfonate had positive synergistic interaction on the reduction of IFT. Reasonable mixture of petroleum sulfonate components with different polarities could avoid chromatographic separation and improve the interfacial activity of products. When the oil separation rate was 70%, the IFT between oil and water was the lowest, which served as a reference for the separation of non-sulfonated oil. Under the same oil displacement conditions, crude oil from different blocks had a greater impact on oil–water IFT. The ultra-low IFT appeared when intermediate petroleum sulfonate and water-soluble petroleum sulfonate were compounded with 3:1.

摘要

为了为石油磺酸盐的分离过程和石油磺酸盐组分的混合规律提供有价值的信息，分别采用水提法和柱色谱法分离非磺化油和石油磺酸盐组分。研究了油分离率、原油来源和石油磺酸盐组成对油水界面张力（IFT）的影响。结果表明，用于驱油的石油磺酸盐产品的油水IFT受多种因素的影响。石油磺酸盐中少量非磺化油的存在对降低IFT具有正的协同作用。不同极性的石油磺酸盐组分的合理混合可以避免色谱分离，提高产品的界面活性。当油分离率为70%时，油水间的IFT最低，可作为非磺化油分离的参考。相同驱油条件下，不同区块原油对油水IFT影响较大。中间体石油磺酸盐和水溶性石油磺酸盐按3:1配比时出现超低IFT。