A Multi-Component and Multi-Functional Synergistic System for Efficient Viscosity Reduction of Extra-Heavy Oil

作者：Zuguo Yang, Yanxia Liu, Jing Jiang, Lijuan Pan, Dandi Wei, Xingen Feng, Long He, Jixiang Guo, Yagang Zhang · 发表于：Molecules · 年份：2025 · DOI：10.3390/molecules30224446 · 被引用次数：3 · 研究领域：Petroleum Processing and Analysis、Enhanced Oil Recovery Techniques、Hydrocarbon exploration and reservoir analysis

The extra-heavy oil in the Tahe Oilfield of China has extremely high viscosity, as it is rich in the heavy components asphaltene and resin, creating significant difficulties in its exploitation and transportation. Therefore, it is important to effectively reduce the viscosity and improve the fluidity of this extra-heavy oil. The traditional viscosity reduction method suffers from a high blending ratio and a shortage of light crude oil resources for extra-heavy oil blending. In this study, coal tar and washing oil-widely available low-cost by-products of the coal chemical industry-are used for extra-heavy oil blending and viscosity reduction. Washing oil-containing light components distilled from coal tar-was highly effective in reducing the viscosity of extra-heavy oil. When the dilution ratio of washing oil is 0.25, the viscosity of extra-heavy oil is reduced to 1214 mPa·s, and the viscosity reduction rate is 99.8%, indicating that washing oil is an efficient viscosity-reducing agent in extra-heavy oil blending. GC-MS showed that the washing oil contained abundant aromatic hydrocarbons and aromatic heterocyclic rings. A multi-component viscosity reduction system using washing oil coupled with toluene, xylene, and surfactant achieved an even better viscosity reduction effect. In conclusion, we designed a low-cost, high-efficiency, multi-component, and multi-functional synergistic system for extra-heavy oil viscosity reduction in the Tahe Oilfield. In the proposed working mech...