Hydraulic Fracturing Behavior in Shale with Water and Supercritical CO₂ under Triaxial Compression

Table 2

Time comparison of pump pressure to peak using water and SC-CO₂.

No.	Bedding plane angle	Fracturing fluid	Injection rate (ml/s)	Time (s)	Time ratio ()
W1	0°	Water	0.3	26	27.73
S1	0°	SC-CO2		721
W3	30°	Water		25	25.20
S3	30°	SC-CO2		630
W5	60°	Water		25	27.16
S5	60°	SC-CO2		679
W7	90°	Water		23	23.48
S7	90°	SC-CO2		540

denotes the time of SC-CO₂ pump pressure reaching peak. denotes the time of water pump pressure reaching peak.