| Abstrakt: |
To address the environmental and formation damage caused by traditional hydraulic fracturing in coalbed methane and shale gas extraction, supercritical CO2 (SC-CO2) fracturing technology has emerged as an effective alternative due to its low viscosity, high diffusivity, and waterless nature. This paper reviews recent advancements in experiments and numerical simulations to explore the mechanisms of fracture initiation and propagation in this technology, with a focus on analyzing fracture initiation pressure, propagation patterns, and influencing factors. The findings show that SC-CO2 fracturing can generate complex fracture networks at lower initiation pressures, with stress conditions, temperature, and natural fractures significantly impacting fracture initiation and propagation. Additionally, the paper highlights existing limitations in accurately simulating CO2 flow, phase transitions, and its interactions with natural fractures, offering optimization suggestions and future perspectives. [ABSTRACT FROM AUTHOR] |
