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Fiber Bragg grating‐based experimental and numerical investigations of CO 2 migration front in saturated sandstone under subcritical and supercritical conditions
Author(s) -
Fan Chengkai,
Li Qi,
Ma Jianli,
Yang Duoxing
Publication year - 2019
Publication title -
greenhouse gases: science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 32
ISSN - 2152-3878
DOI - 10.1002/ghg.1838
Subject(s) - supercritical fluid , fiber bragg grating , materials science , carbon dioxide , supercritical carbon dioxide , optics , mechanics , chemistry , optoelectronics , physics , organic chemistry , wavelength
Carbon dioxide (CO 2 ) can be at risk of leakage during its storage in deep saline aquifers due to stress field changes in the reservoir. The aim of this study was to investigate the effects of CO 2 injection pressure on dynamic strain response of the reservoir and the CO 2 migration process. A series of core flooding experiments was performed with the‐state‐of‐art fiber Bragg grating sensors. The results show that the surface strain response was linearly correlated with CO 2 injection pressure. Carbon dioxide migration velocity can be estimated from the strain response time differences among three gratings. The migration velocity of supercritical CO 2 is higher than that of liquid CO 2 but lower than gaseous CO 2 . Finally, numerical simulation was applied to model the CO 2 migration process and the simulated values were compatible with those of experiments. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.