Injectivity is one of several key parameters that determine the effectiveness of the geologic formation targeted for CO2 injection. In general, the injectivity depends on various factors including the formation permeability, formation thickness, relative permeability, and porosity reduction due to mineral precipitation. Salt-precipitation caused by evaporation of brine into the CO2 stream near injection well is one of the important factors that reduce the injectivity. The objective of this study is to evaluate the effect of parameters such as formation permeability, porosity, residual gas saturation, and residual liquid saturation on salt-precipitation and corresponding permeability (k) reduction. Specific combination of injection rate and permeability caused a dramatic increase of solid NaCl saturation at the lower part of aquifer, which contributes to high pressure build-up and eventually lowers the injectivity.
Bibliographical noteFunding Information:
This research was supported by the project entitled ‘Development of supercritical CO2 injection system for geologic storage’ funded by ‘Korea Research Council Industrial Science & Technology’.
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