Oxidation of n-Alkane (n-C sub(8)H sub(18)) under Reservoir Conditions, in Context of Gas Mixture Injection (CO sub(2)/O sub(2)): Construction of a Kinetic Model

CO sub(2) geosequestration or enhanced oil recovery (EOR) by CO sub(2) injection in hydrocarbon reservoirs is suggested as a short-term solution for limiting CO sub(2) atmospheric accumulation. In the case of oxy-combustion CO sub(2) capture, the main annex gas associated with CO sub(2) is O sub(2)...

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Bibliographic Details
Published in:Energy & fuels 2015-03, Vol.29 (3), p.1913-1922
Main Authors: Pacini-Petitjean, C, Morajkar, P, Burkle-Vitzthum, V, Randi, A, Lorgeoux, C, Morel, D, Pironon, J, Faure, P
Format: Article
Language:English
Subjects:
Carbon capture and storage
Carbon dioxide
Enhanced oil recovery
Gas mixtures
Hydrocarbons
Mathematical models
Oxidation
Reaction kinetics
Reservoirs
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Summary:CO sub(2) geosequestration or enhanced oil recovery (EOR) by CO sub(2) injection in hydrocarbon reservoirs is suggested as a short-term solution for limiting CO sub(2) atmospheric accumulation. In the case of oxy-combustion CO sub(2) capture, the main annex gas associated with CO sub(2) is O sub(2) in important proportion ( less than or equal to 7%). Even if hydrocarbon oxidation processes by O sub(2) are well-known in high-temperature-low-pressure (HT-LP) conditions, scarce data are available under reservoir conditions (high-pressure-low-temperature, HP-LT). To predict the hydrocarbon evolution in the presence of O sub(2) in an oil-depleted reservoir, it is necessary to investigate their reactivity. As a matter of fact, a double approach combining experimentation and modeling was performed in this study. Experiments were carried out on a model compound (n-octane), by injecting O sub(2)/N sub(2) gas mixtures in a HP-LT titanium reactor. In parallel, a detailed kinetic model for n-octane, generated by the software EXGAS, was applied. Several reactions were added, and some rate parameters have been adjusted to adapt the model to reservoir conditions. The modified model was validated by experiments performed at different reaction temperatures and O sub(2) concentrations. The consistency between experimentations and modified oxidation model is promising for the development of a tool allowing the prediction of hydrocarbon reservoir stability.
ISSN:0887-0624
1520-5029
DOI:10.1021/ef502553x