Abstract
Pore network modelling offers a versatile and efficient means for examining the complex interplay of a variety of microscopic processes affecting subsurface migration of \(\hbox {CO}_{2}\) injected for storage. We present a dynamic pore-to-core network model capable of simulating the full range of \(\hbox {CO}_{2}\) migration processes under the influence of capillary and gravity forces, including \(\hbox {CO}_{2}\) dissolution in brine. A parametric sensitivity study investigating four variables that define the microscopic Bond number, viz: mean pore radius, \(\hbox {CO}_{2}\)–brine interfacial tension, brine–\(\hbox {CO}_{2}\) density difference, and network height, was performed. Two broad classes of behaviours were identified—one quasi-stable and the other unstable (migratory)—and critical gas saturation \(({S}_\mathrm{gc})\) was found to change in a non-monotonic way with transition from quasi-stable to migratory regime. The model predicts strong effects of gravity at the scale typical of continuum-type simulator gridblocks, and pore size distribution variance and pore connectivity were found to have a major impact on \({S}_\mathrm{gc}\) which cannot be predicted a priori through the use of Bond number scaling. For temperatures and pressures above the \(\hbox {CO}_{2}\) critical point, \(\hbox {CO}_{2}\) and \(\hbox {CH}_{4}\) flow regimes in brine displayed generally similar characteristics, suggesting that flow coefficients (e.g. relative permeability) of \(\hbox {CH}_{4}\) and \(\hbox {CO}_{2}\) in brine could be used interchangeably in continuum-type simulators with effectively the same results.
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The authors wish to thank Foundation CMG and Scottish Carbon Capture & Storage for providing funds for this study.
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Bagudu, U., McDougall, S.R. & Mackay, E.J. Pore-to-Core-Scale Network Modelling of \(\mathbf{CO}_{\mathbf{2}}\) Migration in Porous Media. Transp Porous Med 110, 41–79 (2015). https://doi.org/10.1007/s11242-015-0556-z
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DOI: https://doi.org/10.1007/s11242-015-0556-z