Flow Interactions Between Water and CO2 in 2D Heterogeneous Porous Micromodels

Abstract eng:
Multiphase flow of water and supercritical C02 in porous media is central to the geologic sequestration of C02 within saline aquifers. The coupled flow dynamics of C02 and brine in geologic media must be better understood, particularly at the pore scale, as pore-scale processes represent a critical component of accurately predicting large-scale migration of injected C02. In this work, the pore-scale flow interactions of water and liquid/supercritical C02 are being quantified in 2D heterogeneous porous micromodels at reservoir-relevant conditions (i. e., 80 bar, 20°C), in an attempt to accurately mimic the process of C02 injection into saline aquifers. The initial results show that the dominant C02 flow paths have very complex spatial configuration, which highlights the importance of the local pressure (e. g., capillary) gradient in C02 front migration.

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