Ultra-High-Pressure Hydraulic Slitting Pressure Relief and Penetration Enhancement Technology and Equipment for Soft Coal Seams

Table 3

Comparison of the calculation results of the drilling radius.

Cumulative extraction days	Single hole (average) cumulative total drainage (m^3)	Number of holes to be drilled (pcs)	Drainage radius (m)
30	350.17	553.31	1.56
60	518.30	373.82	1.90
90	645.86	299.99	2.12
120	811.61	238.73	2.37
150	944.08	205.23	2.56
180	1068.96	181.25	2.73