摘要
通过静态氧化管实验以及热重/微分热重(TG/DTG)手段研究了轻质原油在不同含氧浓度空气(21%和8%)以及储层岩石颗粒条件下原油氧化特征,并结合Arrhenius氧化动力学模型定量地表征各因素对原油氧化活性影响的大小。结果表明:空气中含氧浓度减小会降低氧化反应速率,储层岩石对原油氧化的催化作用促进氧化反应的进行;原油经贫氧空气氧化后剩余气体中含氧浓度显著下降,大大提高了空气驱的安全性;热动力学分析表明:原油经历了低温氧化、燃料沉积及高温氧化三个阶段,储层岩石对原油氧化的积极作用强于氧气浓度降低所产生的消极影响,可显著降低原油在贫氧空气中的活化能,这一发现有利于贫氧空气驱的推广应用。
In this artide,we analyse the oil oxidation characteristics of the light oil at different oxygen concentrations(21%and 8%)and in the presence of the reservoir rock by the static oil oxidation tube and thermogravimetry/derivative thermogravimetry(TG/DTG).According to the Arrhenius oxidation kinetics model,the influence of the factors on crude oil oxidation activity is char-acterized quantitatively.The results show that the lower oxygen concentration can reduce the oxidation reaction rate,and in addi-tion,the reservoir rock has strong catalytic impacts on oil oxidation,which can promote the oxidation reaction.The oxygen concen-tration of the remaining gas drops significantly after the oxidation in a lower oxygen concentration,which greatly improve the safety of air injection displacement.The thermal analysis shows that the crude oil exhibits three stages of low temperature oxidation,fuel deposition and high temperature oxidation.The positive impact of cuttings on the crude oil oxidation is stronger than the negative impact of the lower oxygen concentration,which can significantly reduce the activation energy of crude oil at low oxygen environ-ment.It is benefit to the application of lean oxygen injection displacement.
作者
蒲万芬
顾飞
宋戈
刘鹏刚
刘哲知
Pu Wanfen;Gu Fei;Song Ge;Liu Penggang;Liu Zhezhi(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China;Northeast Sichuan Gas Production Plant,Southwest Oil and Gas Company,SINOPEC,Langzhong,Sichuan 637400,China)
出处
《油气藏评价与开发》
CSCD
2018年第2期35-40,共6页
Petroleum Reservoir Evaluation and Development
关键词
轻质原油
氧化特征
含氧浓度
储层岩石
氧化动力学
light oil
oxidation characteristic
oxygen concentration
reservoir rock
oxidation kinetics
