减氧空气与轻质原油低温氧化反应特征  

Reaction characteristics of low temperature oxidation of light crude oil with disoxidation air

作　　者：王云飞 魏建光[2] Wang Yunfei;Wei Jianguang(School of Petroleum Engineering,Northeast Petroleum University,Daqing Heilongjiang 163711,China;Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development of Ministry of Education,Northeast Petroleum University,Daqing Heilongjiang 163711,China)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163711 [2]东北石油大学陆相页岩油气成藏及高效开发教育部重点实验室,黑龙江大庆163711

出　　处：《地质科技通报》2023年第2期207-213,共7页Bulletin of Geological Science and Technology

基　　金：国家自然科学基金重点项目(51334007)。

摘　　要：塔河北区块轻质原油与减氧空气在温度和压力作用下,探究其组分变化情况和耗氧量规律。在室内使用高温高压反应釜开展原油静态氧化实验,较为系统地研究不同含氧量及不同注气量的减氧空气对原油的氧化作用;并利用色谱分析对烃类分析,收集反应气体进行气体分析,气体组分和原油组分都有不同程度的变化。研究结果表明:①原油样本与减氧空气发生低温氧化反应,重质组分C_(21)以上的组分均下降,低于C_(13)的轻质组分含量均上升;②原油氧化效果随着含氧量上升而增强,反应过程组分对应“拐点”靠前;③含氧量一定时,改变油气比,反应对应的“拐点”不变;含氧量为下降趋势后趋于平缓;④低温氧化过程生成的CO_(2)含量为上升趋势后趋于平缓;⑤在油藏温度(160℃)下,原油主要涉及2个反应热裂解和加氧反应。热裂解反应与含氧量无关,和温度有关,主要反应温度是160~200℃。高碳组分沥青质等重质组分会分解成饱和烃。加氧反应主要是芳香烃,胶质加氧反应也会生成沥青质。当2种反应同时存在时,沥青质参与热裂解的含量大于加氧反应芳香烃等生成的沥青质量,会导致沥青质含量减少。With the temperature and pressure effect,the composition change and oxygen consumption law of light crude oil and discoxidation air in Tahei North Block were studied.The static oxidation experiment of crude oil was carried out in a high temperature and high pressure reactor indoors to systematically study the oxidation effect of crude oil by disoxidation air with different oxygen content and different gas injection volume;the hydrocarbon was analyzed by chromatographic analysis,and the reaction gas was collected for gas analysis.The results showed that:①The low-temperature oxidation reaction between crude oil sample and disoxidation air decreased the components above C_(21)and increased the content of light components below C_(13);②The oxidation effect of crude oil increased with the increase of oxygen content,and the components in the reaction process corresponded to the"inflection point"in the front;③When the oxygen content was constant,the"inflection point"corresponding to the reaction remained unchanged by changing the oil-gas ratio;In the overall reaction process,the oxygen content decreased and then tended to be flat;④CO_(2)was generated in the process of low-temperature oxidation,and the CO_(2)content tended to be flat after increasing;⑤At reservoir temperature(160℃),crude oil mainly involves two reaction thermal cracking and oxygenation reactions.The thermal cracking reaction is not related to the oxygen content,but to the temperature.The main reaction temperature is 160-200℃.Heavy components such as high-carbon asphaltene will be decomposed into saturated hydrocarbons.The oxygenation reaction is mainly aromatic hydrocarbon,and the resin oxygenation reaction will also produce asphaltene.When the two reactions exist at the same time,the content of asphaltene participating in thermal cracking is greater than the quality of asphaltene generated by oxygenation reaction aromatic hydrocarbon,which will lead to the decrease of asphaltene content.

关 键 词：减氧空气 含氧量 低温氧化 轻质原油 组分变化 

分 类 号：TE35[石油与天然气工程—油气田开发工程]