Investigation on the limiting oxygen concentration of combustible gas at high pressures and temperatures during oil recovery process

被引:13
作者
Li, Pengliang [1 ]
Liu, Zhenyi [1 ]
Li, Mingzhi [1 ]
Zhao, Yao [1 ]
Li, Xuan [1 ]
Wan, Song [1 ]
Ma, Yuanyuan [1 ]
He, Yanghua [1 ]
机构
[1] Beijing Inst Technol, State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China
基金
国家重点研发计划;
关键词
Air injection; Wellbore explosion; High pressure; High temperature; Limiting oxygen concentration; FLAMMABILITY LIMITS; CRUDE-OIL; AIR; MIXTURES; CO2; INJECTION; IGNITION; NITROGEN;
D O I
10.1016/j.energy.2020.119157
中图分类号
O414.1 [热力学];
学科分类号
摘要
High pressure air injection is an important method for oil recovery. In this process, due to exist of combustible gas and oxygen, the wellbore explosion accident may happen. To solve the problem, the optimal method is to control the oxygen concentration in the wellbore. Thus, it needs to investigate the limiting oxygen concentration (LOC) of combustible gas at high pressures and temperatures. In this study, experiments were carried out to investigate the LOC of combustible gas at pressures from 1 MPa to 15 MPa and temperatures from 40 degrees C to 120 degrees C. The influence of pressure and temperature on LOC was analyzed. The results showed that the LOC of combustible gas declines a lot as the initial pressure and temperature increases. At 15 MPa and 120 degrees C, the LOC drops up to 8.21%. It was also found that the LOC is exponentially and linearly dependent on initial pressure and temperature, respectively. Besides, the empirical formulas were proposed to calculate the LOC at different conditions. Based on the present results, the standard for controlling the oxygen concentration in the wellbore was confirmed. As a result, the allowable oxygen concentration in the wellbore at different conditions can be determined. Therefore, the results of this study can help to avoid the wellbore explosion and ensure safety during air injection process. (C) 2020 Elsevier Ltd. All rights reserved.
引用
收藏
页数:10
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