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Publisher Summary The injection of carbon dioxide (CO2)—a greenhouse gas (GHG)—in coalbeds is one of the most attractive options of all underground CO2 storage possibilities; the CO2 is stored and at the same time the recovery of coalbed methane (CBM) is enhanced. The revenue of methane (CH4) production can offset the expenditures of the storage operation. It is believed that the existing numerical simulators developed to model the primary CBM recovery process, in general, do not have the capability to handle the more complicated mechanisms involved in the CO2 sequestration processes in coalbeds. However, the improved CBM simulators with additional features of dual porosity approach, mixed gas diffusion, stress dependent permeability and porosity, and coal shrinkage/swelling are capable to history match the Alberta Research Council's (ARC) field data. Even though different approaches are used, all history matches indicate the significant effects of permeability variation due to stress and adsorbed gas content and mixed gas diffusion between the coal matrix and the natural fracture system during the micro-pilot tests. |
