Multifield Coupling Numerical Simulation on the Effect of Low-Temperature Carbon Dioxide Replacement in Carbon Sequestration Strip-Filled Mining Area
In order to understand the impact of injection methods for low-temperature carbon dioxide geological storage in strip-filled mining area on the diffusion path of CO2 and the time limit for gas replacement in mining areas,as well as to explore the changes in flow field and temperature field during the injection process,this study proposed back-end and both-ends pressurized injection methods based on the characteristics of strip-filled mining areas,and compared the advantages and disadvantages of these two injection methods using Fluent numerical simulation.The results show that the both-ends injection method reaches the replacement limit 4 400 s earlier than the back-end injection method.The CO2 volume fraction of back-end injection is 20.1％,with a decrease of 4％in oxygen volume fraction and 16.1％in nitrogen volume fraction;The both-ends injection results in a CO2 volume fraction of 11.2％,with a decrease of 2.3％in oxygen volume fraction and 8.9％in nitrogen volume fraction;Back-end injection reduces the overall temperature of the mining area by 5.4 ℃,while both-ends injection reduces the overall temperature by 3.8 ℃.
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