Power-to-Gas (PtG) is a chemical energy storage technology that converts electrical energy into combustible gas with high energy density. Hydrogen generated by ionization and captured carbon dioxide can be used to synthesize methane, which can be used for power generation or strategic energy storage. In order to achieve carbon neutrality. Geological energy storage has always been regarded as one of the reliable energy storage methods due to its energy storage capacity and economic advantages. The storage of methane with carbon dioxide as cushion gas in the same geological reservoir will significantly increase the methane recovery rate, but the control and optimization of the size of the mixed area of ​​the two gases is crucial.
Carbon dioxide is injected into the target reservoir as cushion gas to provide the required pressure of the reservoir and prevent groundwater intrusion, thereby reducing the energy loss of methane during the recovery period. In order to reduce the mixing degree of the two gases and ensure the mechanical stability of the reservoir, researchers at the Wuhan Institute of Rock and Soil Mechanics, Chinese Academy of Sciences first studied the physical properties of carbon dioxide and methane gas and the physical properties of the mixed gas, based on the carbon dioxide at the critical point The characteristics of physical property changes and the characteristics of mixed gas properties establish a hydraulic coupling model to study the fluid transport mechanism in the reservoir, the mixing mechanism between gases and the mechanical stability of the reservoir. Secondly, through comparison with published models, it is found that the calculation results are in good agreement, which further confirms the reliability of the established flow model. The subsequent step-by-step complex hydraulic coupling model was studied in detail for different reservoir thickness, geological structure, temperature and reservoir mechanical stability during injection. It was found that the increase in reservoir thickness, the increase in anticline angle and the increase in temperature have a certain degree of positive significance for the reduction of gas mixing. The researchers determined the pressure conditions for the safe injection of the reservoir through mechanical stability analysis, which provided reference for the actual site construction.
The research results were published online in the international journal Energy & Fuels. The first author was Ma Jianli, a doctoral student at the Wuhan Institute of Geotechnical Sciences, and the corresponding author was researcher Li Qi.
Research on hydraulic coupling response and mixing mechanism in the same layer of geological energy storage
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