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• W3089275703 abstract "CO 2 sequestration in coal seam has proved to be an effective way for reducing air pollution caused by greenhouse gases. A study on the rules of fluid transfer and reliability of CO 2 storage during gas injection is necessary for the engineering application. However, the clarification of multifield coupling in long-term CO 2 sequestration is the difficulty to solve the aforementioned problem. Previous investigations on the coupled model for CO 2 storage in coal seam were not exactly comprehensive; for example, the multiphase flow in the fracture and the nonlinear behavior of gas diffusion were generally neglected. In this paper, a new multistage pore model of the coal matrix and the corresponding dynamic diffusion model were adopted. Meanwhile, the CO 2 -induced coal softening and the CO 2 -water two-phase flow in coal fracture were also taken into account. Subsequently, all the mentioned mechanisms and interactions were embedded into the coupled hydromechanical model, and this new fully coupled model was well verified by a set of experimental data. Additionally, through the model application for long-term CO 2 sequestration, we found that the stored CO 2 molecules are mainly in an adsorbed state at the early injection stage, while with the continuous injection of gas, the stored CO 2 molecules are mainly in a free state. Finally, the roles of multiphase flow and gas dynamic diffusion on fluid transfer and coal behavior were analyzed. The results showed that the impact of multiphase flow is principally embodied in the area adjacent to the injection well and the coal seam with lower initial water saturation is more reliable for CO 2 sequestration, while the impact of gas dynamic diffusion is principally embodied in the area far away from the injection well, and it is safer for CO 2 sequestration in coal seam with greater attenuation coefficient of CO 2 diffusion." @default.
• W3089275703 created "2020-10-01" @default.
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• W3089275703 date "2020-09-24" @default.
• W3089275703 modified "2023-10-07" @default.
• W3089275703 title "A Fully Coupled Hydromechanical Model for CO2Sequestration in Coal Seam: the Roles of Multiphase Flow and Gas Dynamic Diffusion on Fluid Transfer and Coal Behavior" @default.
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• W3089275703 doi "https://doi.org/10.1155/2020/8871614" @default.
• W3089275703 hasPublicationYear "2020" @default.
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