To clarify the effects of key operational parameters on fracturing performance during convective heat transfer of CO2 fracturing fluid in fractures(taking into account of filtration loss),numerical simulations were made on the heat and mass transfer of liquid CO2 fracturing fluid in shale reservoir fractures.Focusing on fracture temperature,pressure and density fields,analysis centered on the influencing factors of CO2 convection.The results show that after CO2 injection,along the fracture length,the CO2 fracturing fluid temperature gradually rose to a peak,then slightly decreased before stabilizing;the CO2 pressure decreased gradually with a slow decline initially and a rapid decline later,eventually stabilizing; the CO2 density decreased to a minimum then slightly rises before stabilizing.As the injection rate increases, the maximum temperature of the CO2 fracturing fluid decreases and the total filtration loss increases.Raising the injection temperature increased CO2 temperatures deeper in the fracture(farther from the inlet)and also raised total loss.Increasing the injection pressure raised the CO2 temperature nearer the fracture inlet and reduced total loss.These findings can provide a theoretical reference for designing CO2 fracturing operations in shale reservoirs.
SUN Shihui
,
ZHANG Wan
,
YI Tinglong
,
GAO Yanwen
,
TENG Shifu
. Convective heat transfer of CO2 fracturing fluid in shale reservoir fractures considering filtration loss[J]. Special Oil & Gas Reservoirs, 2026
, 33(1)
: 140
-146
.
DOI: 10.3969/j.issn.1006-6535.2026.01.016
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