摘要
以渤海稠油为原料,研究了空气低温催化氧化对稠油组成和性质的影响;并抽提分离出氧化稠油中石油羧酸,制成石油羧酸盐,评价其乳化性能;最后以稠油氧化程度、乳化助剂加量、含水率和乳化温度考察了助制作用下氧化稠油的乳化性能。实验结果表明:稠油经空气低温催化氧化72 h后,沥青质+胶质下降了4.4%,相对平均分子质量减小5.18%,氧化对稠油起到了一定的改质作用;同时稠油酸值由氧化前的2.78 mgKOH/g增长到5.05 mgKOH/g;石油羧酸盐能形成较低的油/水界面张力,具有良好的乳化效果,稠油经空气低温催化氧化后,在复合乳化助剂作用下产生自生表面活性剂,形成水包油型乳液体系达到乳化降黏,降黏率达92%以上。
The effects of air-injection catalytic oxidation at low temperature on the composition and properties of the Bohai Sea heavy oil were investigated in the paper. And the capability of emulsification of petroleum carboxylate produced by petroleum carboxylic acids which were extracted from oxidized heavy oil was evaluated. The effects of many parameters such as degree of heavy oil oxidation, the dosage of texture modifier, water ratio and the temperature of emulsification on the capability of emulsification of oxidized heavy oil were studied, and results were obtained by air-injection catalytic oxidation at low temper- ature for 72h. The results indicate that the content of resins and asphaltene in heavy oil decreased by 4.4%, and the relative average molecular mass also decreased by 5.18%. So oxidation had certain influence on modification of heavy oil behavior, and the acid value of heavy oil increased from 2.78 mg KOH/g to5.05 mg KOH/g. Due to lower O/W interracial tension, petroleum carboxylate has good emulsification effect. Heavy oil generated autogenous surfactant under the action of compound texture modifier by air-injection catalytic oxidation at low temperature, and formed O/W emulsion system to achieve emulsified viscosity reduction, the viscosity reduction ratio reaching above 92%.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第3期154-159,共6页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家科技重大专项"海上稠油热采增效机理及方法研究"(2011ZX05024-005-008)
关键词
稠油
氧化
乳化
自生表面活性剂
降黏
heavy oil
oxidation
emulsification
autogenous surfactant
viscosity reduction
