Abstract
This paper describes miscible displacement upon air injection in a porous medium saturated with oil corresponding to conditions of high-pressure air injection (HPAI). We assume that injection fluids and produced fluids are fully miscible with the oil at the prevailing high pressure. We use three pseudo-components, viz., oxygen, oil, and an inert component, which includes nitrogen, carbon dioxide, etc. To model the fingering instabilities, we follow a similar procedure as proposed by Koval (SPE J. 3(02):145–154, 1963) and include the reaction between oxygen and oil in the Koval model. The equations are solved numerically, using a finite element software package (COMSOL). The results show that a combustion wave is formed. We study the performance at low and high viscosities and show that the reaction improves the speed and degree of recovery at later times.
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Funding
This work was supported by the CNPq (grants 303047/2018-6, 406431/2018-3) and the Program FAPERJ Pensa Rio (grant E-26/210.874/2014).
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Gargar, N.K., Bruining, J., Kokubun, M.A.E. et al. Combustion in miscible displacement for high-pressure air injection. Comput Geosci 24, 1663–1672 (2020). https://doi.org/10.1007/s10596-020-09977-y
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DOI: https://doi.org/10.1007/s10596-020-09977-y