Research and Application of Oxygen-Reduced-Air-Assisted Gravity Drainage for Enhanced Oil Recovery

Jiangfei Wei, Hongwei Yu (), Ming Gao, Peifeng Yan, Kesheng Tan, Yutong Yan, Keqiang Wei, Mingyan Sun, Xianglong Yu, Zhihua Chen and Qiang Chen
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Jiangfei Wei: University of Chinese Academy of Sciences, Beijing 101400, China
Hongwei Yu: National Key Laboratory of Enhanced Oil and Gas Recovery, Beijing 100083, China
Ming Gao: University of Chinese Academy of Sciences, Beijing 101400, China
Peifeng Yan: PetroChina Huabei Oilfield Company, Renqiu 062550, China
Kesheng Tan: University of Chinese Academy of Sciences, Beijing 101400, China
Yutong Yan: University of Chinese Academy of Sciences, Beijing 101400, China
Keqiang Wei: University of Chinese Academy of Sciences, Beijing 101400, China
Mingyan Sun: University of Chinese Academy of Sciences, Beijing 101400, China
Xianglong Yu: University of Chinese Academy of Sciences, Beijing 101400, China
Zhihua Chen: University of Chinese Academy of Sciences, Beijing 101400, China
Qiang Chen: University of Chinese Academy of Sciences, Beijing 101400, China

Energies, 2025, vol. 18, issue 3, 1-18

Abstract: This paper summarizes the research progress and applications of oxygen-reduced-air-assisted gravity drainage (OAGD) in enhanced oil recovery (EOR). The fundamental principles and key technologies of OAGD are introduced, along with a review of domestic and international field trials. Factors influencing displacement performance, including low-temperature oxidation reactions, injection rates, and reservoir dip angles, are discussed in detail. The findings reveal that low-temperature oxidation significantly improves the recovery efficiency through the dynamic balance of light hydrocarbon volatilization and fuel deposition, coupled with the synergistic optimization of the reservoir temperature, pressure, and oxygen concentration. Proper control of the injection rate stabilizes the oil–gas interface, expands the swept volume, and delays gas channeling. High-dip reservoirs, benefiting from enhanced gravity segregation, demonstrate superior displacement efficiency. Finally, the paper highlights future directions, including the optimization of injection parameters, deepening studies on reservoir chemical reaction mechanisms, and integrating intelligent gas injection technologies to enhance the effectiveness and economic viability of OAGD in complex reservoirs.

Keywords: oxygen-reduced-air-assisted gravity drainage; low-temperature oxidation; gas injection rate; reservoir dip angle (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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