Oxidation Characteristics and Oil Displacement Effect Evaluation of Air Flooding in Low Permeability Reservoirs

doi:10.3969/j.issn.1006-6535.2024.04.014

Abstract

Abstract: In the process of high-pressure air injection development in low-permeability reservoirs,the mechanism of crude oil oxidation is unclear,and there is difficulty in predicting enhanced oil recovery potential.In order to solve these problems,low-temperature oxidation experiments and physical simulation experiments of air injection in long core were conducted to analyze the differences in oil and gas composition before and after oxidation reactions under different reservoir conditions,reveal the characteristics and laws of crude oil low-temperature oxidation,investigate the development transition potential from water flooding to air flooding in low-permeability reservoirs,and evaluate the oil displacement effect of air injection.The results show that with the increase in oxidation temperature,the oxygen consumption of crude oil rises;while after the oxidation,the light components of the oil sample decrease and the medium and heavy components increase.Excessive water saturation reduces the heat effect of crude oil oxidation.The sensitivity factors of crude oil oxidation in terms of sensibility from large to small are pressure,temperature,and water saturation.So,air flooding has a better oil displacement effect,with an oil displacement efficiency of up to 41.20%.However,excessively high gas injection pressure can cause gas channeling.After reaching the economic limit by water flooding,development mode switched to air flooding can improve oil displacement efficiency,but the increment of oil displacement efficiency during the air flooding is relatively small,with an ultimate oil displacement efficiency of 50.92%.Therefore,in actual development process,oxygen-reduced air flooding should be adopted,and gas injection parameters should be optimized so as to control gas channeling and enhance oil recovery rate.The research results can provide a theoretical basis and technical support for the development of low-permeability reservoir by air flooding.

Key words: low-permeability, oxidation, composition, air flooding, oil displacement efficiency

CLC Number:

TE357

Luo Chen, Liu Huiqing, Bai Zongxian, Wang Zhuanzhuan, Wang Liangliang, Zhang Yaqian. Oxidation Characteristics and Oil Displacement Effect Evaluation of Air Flooding in Low Permeability Reservoirs[J]. Special Oil & Gas Reservoirs, 2024, 31(4): 109-117.

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