Experimental Investigation on Propagation Behavior of Hydraulic Fractures in Coal Seam during Refracturing

Table 2

Parameters used during refracturing simulation experiments in coal.

Specimen number	In situ stress (initial fracturing)	In situ stress (refracturing)	Injection rate (mL/min)	Fluid viscosity (mPa·s)
	, , (MPa)	, , (MPa)
1	15, 12, 10	15, 10, 12	20	1
2	15, 12, 10	15, 12, 10	20	1
3	15, 12, 10	15, 12, 10	30	1
4	15, 12, 8	15, 8, 12	20	1
5	15, 12, 8	15, 12, 8	20	1
6	15, 12, 8	15, 12, 8	30	1
7	15, 12, 6	15, 6, 12	20	1
8	15, 12, 6	15, 12, 6	20	1
9	15, 12, 4	15, 4, 12	20	1
10	15, 12, 4	15, 12, 4	20	1