Numerical Simulation and Sensitivity Analysis of Hydraulic Fracturing in Multilayered Thin Tight Sandstone Gas Reservoir

Table 3

The injection procedure for hydraulic fracturing simulation.

Fracturing injection stage	Injection volume (m^3)	Proppant concentration (kg/m^3)	Injection rate (m^3/min)	Single-stage injection time (min)	Total injection time (min)	Fluid type	Proppant type
1	40	0	3.5	11.4	11.4	Base fluid	/
2	19.96	73	3.5	5.8	17.3	Base fluid	40/70 mesh
3	35	0	3.5	10.0	27.3	Base fluid	/
4	15.04	102	3.5	4.5	31.7	Gel	30/50 mesh
5	22.99	203	3.5	7.0	38.7	Gel	30/50 mesh
6	30.02	290	3.5	9.5	48.2	Gel	30/50 mesh
7	45.02	363	3.5	14.6	62.8	Gel	30/50 mesh
8	35.03	435	3.5	11.6	74.4	Gel	30/50 mesh
9	19.99	508	3.5	6.8	81.1	Gel	30/50 mesh
10	6.6	0	3.5	1.9	83.0	Gel	30/50 mesh