超临界流体
断裂(地质)
水力压裂
煤
声发射
材料科学
粉碎
石油工程
地质学
煤矿开采
矿物学
复合材料
化学
冶金
有机化学
作者
Xiaodong Sun,Kaikai Zhao,Shibin Wang,Xuehang Song,Liyuan Liu
出处
期刊:Energy & Fuels
[American Chemical Society]
日期:2024-02-21
卷期号:38 (5): 4325-4336
标识
DOI:10.1021/acs.energyfuels.3c04412
摘要
To investigate the fracture morphology and expansion characteristics of coal seams by different fracturing methods using supercritical CO2, we carried out supercritical CO2 fracturing of coal bodies and analyzed the temporal and spatial evolution characteristics of coal body fractures based on the pressure–time curves, otoacoustic emission events, and CT structural characterization of coal samples. The following conclusions were made: (1) Tiny fluctuations were observed in the time–pressure curves before fracture, which indicated that the microfracture appeared in the specimen; when a larger range of fissures was produced in the coal sample, the pressure dropped rapidly. (2) The acoustic emission events indicated that the fracturing by supercritical CO2 under the incremental temperature and incremental pressure injection method was stronger than that under the continuous injection method. (3) Compared with hydraulic fracturing, supercritical CO2 fracturing showed smaller fracture tip lag lengths, smaller intruding pore throat widths, and more complex phase changes in fracture extension.
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