| Citation: |
YANG Bing, HUANG Hai, WANG Haizhu, REN Qianqian, QIAO Ruihong, WANG Bin, FAN Xuhao, ZHANG Guoxin. Study on Adaptability of Supercritical CO2 Fracturing on Reservoir Permeability[J]. Journal of South China Normal University (Natural Science Edition), 2025, 57(1): 79-91. DOI: 10.6054/j.jscnun.2025009
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To investigate the adaptability of supercritical CO2 fracturing to reservoir permeability, this study conducted supercritical CO2 fracturing experiments on tight sandstone samples with different permeabilities (0.08~1.0 mD). The characteristics of induced fractures were quantitatively analyzed using CT scanning, and the experimental results were validated and supplemented through field-scale numerical simulations. The results show that supercritical CO2 can effectively fracture rock samples with permeabilities in the range of 0.08~0.3 mD. As permeability increases, the complexity of induced fractures decreases, and the fracture volume reduces. When the permeability exceeds 0.5 mD, supercritical CO2 fails to fracture the rock, whereas hydraulic fracturing remains effective, primarily due to differences in fluid properties. Numerical simulations validated the experimental findings, indicating that supercritical CO2 can successfully fracture reservoirs with different permeabilities under field conditions, but the fracturing effectiveness varies significantly. As reservoir permeability increases (0.01~100 mD), parameters such as fracture half-length, width, height, fractal dimension, and filtration area decrease, while fluid loss gradually increases, leading to a decline in fracturing effectiveness. The study demonstrates that supercritical CO2 is more suitable for low-permeability reservoir stimulation, and parameter optimization is required during operations to adapt to reservoirs with different permeabilities. This research provides a theoretical foundation for the design of supercritical CO2 fracturing operations in unconventional reservoirs.
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