超临界CO2/清水压裂煤体起裂和裂缝扩展试验研究

doi:10.13722/j.cnki.jrme.2018.0253

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Abstract In order to investigate the fracturing characteristics of coal in hydraulic fracturing with supercritical CO2 and water，the TCHFSM–I large-size true triaxial fracturing seepage device was used to simulate the process of fracturing coal seam by applying triaxial stress to 100 mm×100 mm×100 mm coal samples. Based on the theoretical basis of fracturing and experimental data，the pressure-time curves，surface fractures morphology and fractures width were compared and analyzed. The results showed that，compared to water fracturing，under the same three kinds of triaxial stress conditions，supercritical CO2 initiated the fractures more easily. The initiation pressure decreased by 28.3%，28.0% and 27.4%，respectively，and the reduction gradually decreased with confining pressure increasing. Supercritical CO2 fracturing could generate obvious bedding plane fractures and bifurcation fractures，and the more those fractures were generated，the smaller the growth range of main fractures was. The supercritical CO2 penetrated easily into the original bedding plane fissures and micro-fissures or pores in coal during the fracturing process，which caused the pressure to change gradually. Moreover，the fractured coal with supercritical CO2 could not easily maintain the pressure，so that the fractures width was narrow. The fractures width of water fracturing was mainly distributed in the interval of 0.450–0.650 mm and ＞1.250 mm，while the fractures width of supercritical CO2 was concentrated in the interval of 0.050–0.250 mm. The gap between the two kinds of fractures width was approximately 3–6 times，and for some local bifurcation and bedding plane fractures，even reaching about 2 orders of magnitude.

Key words： rock mechanics supercritical CO2 fracturing water fracturing initiation fracture growth fracture width

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	WANG Lei1
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	LIANG Weiguo1
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Cite this article:

WANG Lei1,2,LIANG Weiguo1, et al. Experimental study on fracture initiation and growth in coal using hydraulic fracturing with supercritical CO2 and normal water[J]. , 2019, 38(S1): 2680-2689.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0253 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2680

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