Recently,supercritical CO2(scCO2)injection in shale gas reservoir has drawn great attention for its potential to sequestrate the greenhouse gas underground and enhance shale gas recovery.To further understand the mechanisms of scCO2 sequestration and competitive adsorption between CO2 and CH4,the Longmaxi shale formation in China was selected as the target.In this paper,we provide examples of how experimental isothermal adsorption measurements of scCO2 and methane on Longmaxi cores can be integrated into calculations of field scale simulations.A hybrid DFN and dual porosity media is used for successfully simulating the multiscale transport mechanisms.A numerical multi-component reservoir model,which is solved by fully implicit control volume finite element(CVFE)method with unstructured grids,is created to study several components of the Huff-and-Puff design,such as the injection pressure,the start time and the length of the soaking periods.From the results,we can conclude that CO2 injection into the Longmaxi shale appears to be a technically feasible way of storing CO2 and a limited increase(<1%)in gas recovery.
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