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

Table 4

Comparison of the calculation results of the extraction radius of the borehole (fitting the negative exponential curve of extraction attenuation).

Cumulative extraction days	Single hole cumulative total drainage (m^3)	Number of holes to be drilled (pcs)	Drainage radius (m)
30	262.32	783.61	1.31
60	480.24	403.45	1.83
90	661.28	293.00	2.14
120	811.67	238.71	2.37
150	936.61	206.87	2.55
180	1040.41	186.23	2.69