Optimization of Indirect Fracturing Process Parameters Based on Mechanical Properties of Fractured and Low-Permeability Coal

Figure 10

Numerical simulation results of indirect fracturing coal technology. (a) HFs opening (D_op = 0.5 m, Δσ = 4 MPa, f_cx = 0.22, i_w = 8 m³/min. (b) HFs opening (D_op = 0.5 m, Δσ = 6 MPa, f_c,x = 0.05, i_w = 8 m³/min). (c) HFs opening (D_op = 0.5 m, Δσ = 4 MPa, f_cx = 0.22, i_w = 8 m³/min. (c) HFs opening (D_op = 0.5 m, Δσ = 8 MPa, f_cx = 0.22, i_w = 8 m³/min. (d) HFs opening (D_op = 0.5 m, Δσ = 4 MPa, f_cx = 0.72, i_w = 8 m³/min. (e) HFs opening (D_op = 1.5 m, Δσ = 6 MPa, f_cx = 0.53, i_w = 8 m³/min. (f) HFs opening (D_op = 1.5 m, Δσ = 8 MPa, f_cx = 0.40, i_w = 8 m³/min. (g) HFs opening (D_op = 2.5 m, Δσ = 4 MPa, f_cx = 0.90, i_w = 8 m³/min. (h) HFs opening (D_op = 2.5 m, Δσ = 6 MPa, f_cx = 0.70, i_w = 8 m³/min. (i) HFs opening (D_op = 2.5 m, Δσ = 8 MPa, f_cx = 0.71, i_w = 8 m³/min. (j) HFs opening (D_op = 1.0 m, Δσ = 6 MPa, f_cx = 0.52, i_w = 4 m³/min. (k) HFs opening (D_op = 1.0 m, Δσ = 6 MPa, f_cx = 0.14, i_w = 8 m³/min. (l) HFs opening (D_op = 1.0 m, Δσ = 6 MPa, f_cx = 0.14, i_w = 12 m³/min.

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