THE SUPERCRITICAL CO2 FRACTURING MECHANISIM AND ADVANTAGES ANALYSIS OF SHALE
Supercritical carbon dioxide(CO2)is a promising non-aqueous fracturing fluid compared to the water regular-ly used in hydraulic fracturing operations.It has great potential for improving shale reservoir production.In this study,the characteristics of supercritical CO2 fracturing were summarized,and the effects of CO2 viscosity and energy changes on fracturing were analyzed.Additionally,the advantages of supercritical CO2 fracturing compared to water fracturing were revealed.The results show that supercritical CO2 fracturing has the advantages of sustainability and high efficiency.All shale specimens fractured by supercritical CO2 show smaller breakdown pressure.The shale fractures induced by su-percritical CO2 have the characteristics of simple but larger width,thin but complex.These results are of great signifi-cance for understanding the mechanism and advantages of supercritical carbon dioxide fracturing and provide references for the green development of shale reservoir fracturing.
万方数据
维普
