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

<div>Gas flow around several boreholes. (a) Schematic diagram of extraction of common borehole group. (b) Schematic diagram of drainage of slotted drilling group.</div>

Geofluids

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Figure 5

Figure 5: Ultra-High-Pressure Hydraulic Slitting Pressure Relief and Penetration Enhancement Technology and Equipment for Soft Coal Seams 