Reservoir Evaluation and Development ›› 2018, Vol. 8 ›› Issue (2): 35-40.

• Reservoir Evaluation • Previous Articles     Next Articles

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


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

CLC Number: 

  • TE357.7