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

<div>Fissure distribution. (a) Schematic diagram of the development of fissures around ordinary boreholes. (b) Schematic diagram of the development of fissures around the slotted hole.</div>

Geofluids

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Figure 3

Figure 3: Ultra-High-Pressure Hydraulic Slitting Pressure Relief and Penetration Enhancement Technology and Equipment for Soft Coal Seams 