CO<inf>2</inf> geo-storage capacity enhancement via nanofluid priming
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© 2017 Elsevier Ltd CO 2 geo-storage efficiency is strongly influenced by the wettability of the CO 2 -brine-mineral system. With decreasing water-wetness, both, structural and residual trapping capacities are substantially reduced. This constitutes a serious limitation for CO 2 storage particularly in oil-wet formations (which are CO 2 -wet). To overcome this, we treated CO 2 -wet calcite surfaces with nanofluids (nanoparticles dispersed in base fluid) and found that the systems turned strongly water-wet state, indicating a significant wettability alteration and thus a drastic improvement in storage potential. We thus conclude that CO 2 storage capacity can be significantly enhanced by nanofluid priming.
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