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

Table 1

Summary of the fracturing experiments results.

No.	Bedding plane angle	Fracturing fluid	(MPa)	(MPa)	(ml/s)	(MPa)
W1	0°	Water	25	20	0.3	70.37
W2	15°	Water	25	20	0.3	59.78
W3	30°	Water	25	20	0.3	51.77
W4	45°	Water	25	20	0.3	53.09
W5	60°	Water	25	20	0.3	59.52
W6	75°	Water	25	20	0.3	50.13
W7	90°	Water	25	20	0.3	42.45
W8	0°	Water	30	20	0.3	61.89
W9	0°	Water	35	20	0.3	57.02
W10	90°	Water	30	20	0.3	38.91
W11	90°	Water	35	20	0.3	34.53
W12	0°	Water	25	20	0.2	54.56
W13	15°	Water	25	20	0.2	44.21
W14	30°	Water	25	20	0.2	42.29
W15	45°	Water	25	20	0.2	49.86
W16	60°	Water	25	20	0.2	46.82
W17	75°	Water	25	20	0.2	43.02
W18	90°	Water	25	20	0.2	39.14
S1	0°	SC-CO2	25	20	0.3	52.15
S2	15°	SC-CO2	25	20	0.3	41.81
S3	30°	SC-CO2	25	20	0.3	42.91
S4	45°	SC-CO2	25	20	0.3	39.94
S5	60°	SC-CO2	25	20	0.3	44.46
S6	75°	SC-CO2	25	20	0.3	45.75
S7	90°	SC-CO2	25	20	0.3	38.04
S8	0°	SC-CO2	30	20	0.3	43.20
S9	0°	SC-CO2	35	20	0.3	41.31
S10	90°	SC-CO2	30	20	0.3	30.08
S11	90°	SC-CO2	35	20	0.3	28.88
S12	0°	SC-CO2	25	20	0.2	40.51
S13	15°	SC-CO2	25	20	0.2	36.38
S14	30°	SC-CO2	25	20	0.2	34.42
S15	45°	SC-CO2	25	20	0.2	35.89
S16	60°	SC-CO2	25	20	0.2	32.31
S17	75°	SC-CO2	25	20	0.2	34.49
S18	90°	SC-CO2	25	20	0.2	31.09

Note: denotes axial stress; denotes confining pressure; denotes injection rate; denotes breakdown pressure which is the pressure value of fracturing fluid when the specimen is fractured.