Experiment on Oxidation Mechanism of Crude Oil by Air Flooding in Low permeability Reservoirs

doi:10.3969/j.issn.1006-6535.2022.03.015

Abstract

Abstract: In order to deeply investigate the oxidation characteristics of crude oil and its influencing factors during the development by air flooding of low permeability reservoirs and evaluate its oil displacement efficiency, experiments on crude oil component analysis, oxidation characteristics of crude oil, air flooding and air-foam flooding were conducted to systematically study the oxidation characteristics and laws of crude oil under different conditions, taking the representative reservoirs of low permeability in Xinjiang Oilfield as the study object. The experimental results showed that, under the same conditions, the static oxidation reaction rate of oil sand was higher than and the reaction was more sufficient than that of pure oil sample, and the reaction rate was positively correlated with the reaction pressure, temperature and action time; at the reservoir temperature, the weight ratio of crude oil after oxidation reaction decreased, and the main peak carbon increased; the reaction temperature had a great influence on the dynamic oxidation characteristics of crude oil in air flooding, the higher the temperature, the greater the oxygen consumption and the more sufficient the reaction; the air flooding was effective in oil displacement, with gas channeling easy to occur; the foam flooding could effectively block the gas channeling channel, expand the air swept volume, and improve the air flooding effect. The study results have an exemplary significance regarding the theoretical research and application of air flooding.

Key words: low permeability reservoir, air flooding, oxidation mechanism, oxidation characteristics, oil displacement effect, experimental study

CLC Number:

TE31

Teng Weiwei, Wu Qingxiang, Hu Xiaodie, Wang Xiaoguang, Cheng Hongjie, Zhu Guifang. Experiment on Oxidation Mechanism of Crude Oil by Air Flooding in Low permeability Reservoirs[J]. Special Oil & Gas Reservoirs, 2022, 29(3): 104-111.

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