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| 稠油低温氧化过程结焦行为实验 |
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张锐1,邓君宇1,任韶然1,王玉婷1,张亮1,户昶昊2,王中元2,程海清2
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(1.中国石油大学石油工程学院,山东青岛 266580;2.中国石油辽河油田分公司,辽宁盘锦 124000)
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| 摘要: |
| 采用热重(TGA)、差热(DSC)和高温高压反应釜实验,研究稠油在空气和氮气介质中热转化过程及其反应产物,分析稠油油藏注空气过程中低温氧化对稠油结焦反应的影响,考察稠油在不同反应条件下的临界结焦温度。实验结果表明:随着温度升高,稠油在空气介质中的热转化过程经历低温氧化、沉积结焦和高温氧化3个阶段;低温氧化使稠油的临界结焦温度降低,稠油在氮气介质中的临界结焦温度约为400 ℃,而在空气中经历低温氧化后其临界结焦温度降低至280 ℃。结合稠油结焦机制分析认为其临界结焦温度降低与低温氧化存在显著热效应及组分变化有关,低温氧化过程导致稠油上述变化降低其胶体结构稳定性,引起相分离,加速沥青质物理聚沉,发生化学共聚生焦。 |
| 关键词: 稠油 注空气 低温氧化 结焦温度 热重分析 差热分析 |
| DOI：10.3969/j.issn.1673-5005.2015.04.016 |
| 分类号::TE 624.3 |
| 基金项目:长江学者和创新团队计划项目(IRT1086,IRT1294)；山东省自然科学基金项目(ZR2012EEL01)；中央高校基本科研业务费专项(14CX02040A) |
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| Experimental study on coking behavior of heavy oils in low temperature oxidation process |
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ZHANG Rui1, DENG Junyu1, REN Shaoran1, WANG Yuting1, ZHANG Liang1, HU Changhao2, WANG Zhongyuan2, CHENG Haiqing2
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(1.School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2.Liaohe Oilfield Branch Company, PetroChina, Panjin 124000, China)
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| Abstract: |
| The behaviors of oxidation and coking of heavy oil samples in the presence of air and nitrogen were investigated using different methods, including thermogravimetry analysis (TGA), differential scanning calorimeter (DSC) and a high temperature and high pressure reactor. The effect of low-temperature oxidation on the critical coking temperature of heavy oils at different reaction conditions was studied. The experimental results show that low temperature oxidation can reduce the critical coking temperature of heavy oils. The critical coking temperature of the heavy oil studied in the presence of nitrogen is over 400 ℃ but it reduces to 280 ℃ in the presence of air. The reduction of the coking temperature can be attributed to the thermal effect and the formation of oxygenated oil components in the low temperature oxidation process. It is speculated that the stability of the colloidal structure of heavy oil components can be reduced at the oxygenated condition, which can cause phase separation to accelerate the aggregation of complex asphaltene and resin molecules, leading to chemical copolymerization and coke formation. |
| Key words: heavy oil air injection low-temperature oxidation coking temperature thermogravimetric analysis differential thermal analysis |
