| Summary: | The CO storage capacity is greatly aected by CO injection scenario – i.e. water alternating CO
(WACO ) injection, intermittent injection, and continuous CO injection – and WACO injection strongly
improves the CO trapping capacity. However, the impact of the number of WACO injection cycles on
CO trapping capacity is not clearly understood. Thus, we developed a 3D reservoir model to simulate
WACO injection in deep reservoirs testing dierent numbers of WACO injection cycles (i.e. one, two,
and three), and the associated CO trapping capacity and CO plume migration were predicted. For all
dierent WACO injection cycle scenarios, 5000 kton of CO and 5000 kton of water were injected at a
depth of 2275 m and 2125 m respectively, during a 10-year injection period. Then, a 100-year CO
storage period was simulated. Our simulation results clearly showed, after 100 years of storage, that the
number of WACO cycles aected the vertical CO leakage and the capacity of trapped CO . The results
showed that increasing the number of WACO cycles decreased the vertical CO leakage. Furthermore, a
higher number of WACO cycles increased residual trapping, and reduced solubility trapping. Thus, the
number of WACO cycles signicantly aected CO storage eciency, and higher numbers of WACO
cycles improved CO storage capacity.
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