油气藏评价与开发 ›› 2018, Vol. 8 ›› Issue (2): 35-40.

• 油气藏评价 • 上一篇    下一篇

轻质油藏注空气氧化特性及动力学研究

蒲万芬1,顾飞1,宋戈2,刘鹏刚1,刘哲知1   

  1. 1. 西南石油大学油气藏地质及开发工程国家重点实验室,四川 成都 610500
    2. 中国石化西南油气分公司川东北采气厂,四川 阆中 637400
  • 收稿日期:2017-06-04 出版日期:2018-04-30 发布日期:2018-04-30
  • 作者简介:第一作者简介:蒲万芬(1961—),女,教授,博士生导师,提高采收率理论与技术研究

Research on oxidation characteristics and kinetics of light oil reservoir during the process of air injection

Pu Wanfen1,Gu Fei1,Song Ge2,Liu Penggang1,Liu Zhezhi1   

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2. Northeast Sichuan Gas Production Plant, Southwest Oil and Gas Company, SINOPEC, Langzhong, Sichuan 637400, China
  • Received:2017-06-04 Online:2018-04-30 Published:2018-04-30

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.

关键词: 轻质原油, 氧化特征, 含氧浓度, 储层岩石, 氧化动力学

Abstract:

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 characterized quantitatively. The results show that the lower oxygen concentration can reduce the oxidation reaction rate, and in addition, the reservoir rock has strong catalytic impacts on oil oxidation, which can promote the oxidation reaction. The oxygen concentration 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 environment. It is benefit to the application of lean oxygen injection displacement.

Key words: light oil, oxidation characteristic, oxygen concentration, reservoir rock, oxidation kinetics

中图分类号: 

  • TE357.7