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• W2535741131 abstract "Carbon capture and storage, that is the collection of carbon dioxide (CO2) from power plants and its injection underground, is an important technology for reducing CO2 emissions to the atmosphere and hence, mitigating climate change. A key aspect of CO2 storage is the injection rate into the subsurface, which is limited by the pressure at which formation starts to fracture. Hence, it is vital to assess all of the relevant processes that may contribute to the pressure increase in the aquifer during CO2 injection. The central aim of this study is to analyse the ability of the near-well region of a saline formation to conduct fluids, using a set of analytical solutions that enable quick and reliable assessment of CO2 injectivity. In this research, the near-well fluid flow was assumed to be a function of the non-Darcy flow parameter as defined by the Forchheimer equation. For the analysis of single-phase flow problems, the analytical solution for the Forchheimer flow in closed domains was derived and an alternative method for applying analytical solutions associated with a single well to multiple well systems was proposed. The CO2 injection process was modelled as a two-phase system where the non-Darcy flow was assumed for the gas phase only, including a novel representation of the spatially varying fractional flow function. The solution for immiscible flow was further developed to model compositional displacements, which enabled analysis of the porosity reduction due to salt precipitation in a near-well region. Finally, the effects of gas compressibility were examined by integrating the analytical model with an iterative algorithm for correcting gas properties. Results showed that in low permeability formations when CO2 is injected at high rates non-Darcy flow conditions are more favourable for CO2 storage than linear flow due to better displacement efficiency. This, however, came at the cost of increased well pressures. More favourable estimations of the pressure buildup were obtained when CO2 compressibility was taken into account because reservoir pressures were reduced due to the change in the gas phase properties. The non-Darcy flow resulted in a significant reduction in solid salt saturation values, with a positive effect on CO2 injectivity. In the examples shown, non-Darcy flow conditions may lead to significantly different pressure and saturation distributions in the near-well region, with potentially important implications for CO2 injectivity." @default.
• W2535741131 created "2016-10-28" @default.
• W2535741131 creator A5088123066 @default.
• W2535741131 date "2013-02-01" @default.
• W2535741131 modified "2023-09-27" @default.
• W2535741131 title "Near-well effects in carbon dioxide storage in saline aquifers" @default.
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