Research on Permeability of Coal Samples with and without the Effect of Supercritical CO₂

Abstract:

To improve the low-permeability coal seam gas drainage and gas prevention and to seek the methods to improve the permeability of low-permeability coal, the experimental study on supercritical CO₂ on coal was conducted in the laboratory conditions, and the experiment on pseudo-triaxial permeability testing for coal samples, with and without supercritical CO₂, was conducted. The results show that due to the effect of supercritical CO₂ on coal like physi-chemistry, the porosity of coal was changed, which markedly varied the permeability of coal samples before and after the effect of supercritical CO₂; the permeability of the experimented coal samples was significantly higher than before, and average permeability increased by nearly an order of magnitude under the same volume-stress.

• Periodical: Advanced Materials Research (Volumes 455-456)
• Pages: 168-173
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.455-456.168
• Online since: January 2012
• Authors: Tao Yang, Bai Sheng Nie, Dong Yang, Ru Ming Zhang
• Keywords: Coal Sample, Permeability, Supercritical CO₂, Variation

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