Abstract
Coal seams are natural gas reservoirs that provide potential for future CO2 capture and storage. Many problems must be resolved for CO2 storage in coal seams. To target problems of gas percolation, adsorption, and “stagnation” in gas reservoirs, the specific surface area, pore volume, permeability, and adsorption–desorption curves of three coal types with nanometer magnetite powder (NMP) mass fractions of 0%, 2%, 4%, and 6% were measured in dry state. The coal’s adsorption potential, specific surface area, and pore volume increased with an increase of NMP mass fraction. The specific surface area of coal mixed with NMP differed significantly from data that were calculated from the coal and NMP specific surface area, and the permeability was higher than for core without NMP, which indicates that the surface properties of coal can be changed by NMP addition. Although the permeability of coal core mixed with NMP exceeded that of the original coal core, an increase of NMP mass fraction resulted in an initial increase and then a decrease of coal core permeability from Pingdingshan and Anyang in China. NMP coverage of the coal surface increases the permeability for a coverage below 27%, and the permeability decreases when coverage exceeded 27%. Gas “stagnation” was affected by the ratio of equilibrium pressure to the saturated vapor pressure (p/p0) and by the coverage ratio. This research is significant for coal-bed methane exploration and underground gas storage construction.
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Acknowledgments
This research was funded by the National Natural Science Foundation of China, Grant Numbers 51604092 and 51774116. The authors are grateful for the support of the Shanxi Jincheng Anthracite Mining Group Co., Ltd. We thank Laura Kuhar, PhD, from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
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Zhao, F., Liu, X. & Deng, Q. Effect of Nanomagnetite on Properties of Medium- and High-Rank Coals. Nat Resour Res 30, 591–603 (2021). https://doi.org/10.1007/s11053-020-09724-1
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DOI: https://doi.org/10.1007/s11053-020-09724-1