| Citation: | LIU Gaofeng, GUAN Wenbo, ZHANG Zhen, LI Baolin, LIU Huan, SI Nian. Evolution characteristics on coal fractures induced with CO2 phase transition fracturing based on CT scanning[J]. Journal of Mining Science and Technology, 2024, 9(3): 342-350. doi: 10.19606/j.cnki.jmst.2024.03.003
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This study conducted the CO2-PTF coal experiment to further reveal the fracturing transformation mechanism of CO2 phase transition fracturing(CO2-PTF)coal. According to the CT scanning and 3D fracture reconstruction, we analyzed the fracture structure parameters of coal before and after CO2-PTF, and clarified the evolution characteristics of the three-dimensional fracture structure of coal induced by CO2-PTF. The research results indicated that after CO2-PTF, the total number of fractures in the coal sample decreased, while the total volume and surface area of fractures increased. The CO2-PTF generated fracture expansion and transformation effects where the small-scale fractures were expanded and transformed into larger scale fractures under the CO2-PTF pressure. The number, volume, and surface area of fractures of less than 1 000 μm in length were significantly reduced, while the volume and surface area of fractures of longer than 1 000 μm in length were significantly increased. The expansion and connection between fractures caused a decrease in their quantity. CO2-PTF improves the connectivity of the three-dimensional fracture in coal and is conducive to gas migration and production. This study offers new insights into and evaluation method for the effect of CO2-PTF, and could provide references for the research on fracture evolution characteristics in other unconventional natural gas reservoirs and their modifications.
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