METHOD OF PULSE HYDRAULIC FRACTURING IMPLEMENTATION Russian patent published in 2017 - IPC E21B43/26 E21B28/00 

FIELD: mining engineering.

SUBSTANCE: pulse hydraulic fracturing method involves pumping of liquid to the borehole cavity, formation of pressure drops between bottom-hole zone and borehole cavity by creating periodic pressure pulses in bottom-hole zone in the form of liquid mass wave moved via the borehole cavity forming under regular outflow of borehole liquid, which is under pressure, and increase the borehole pressure due to liquid filling-up. Preliminary assessment is carried out for travel time of liquid mass movement wave from collar to the bottomhole zone and the duration of the extension and closing of formation cracks, stabilizing the well cavity pressure, at which formations cracks are closed, filling-up liquid into the well, during which the movement wave of the liquid mass reaches the bottomhole formation zone and impacts on crack formation, then draininig well liquid, a line for feeding liquid is generated at well collar and which includes an outlet pump branch pipe, high-speed valve, intake pump unit, a pump unit, the outlet ranch pipe of the pump unit connected to the well collar, activation of pump when high-speed valve is open to accelerate liquid in said line, then high speed valve is closed and liquids flow is directed into the well.

EFFECT: improving efficiency of pulse hydraulic fracturing method.

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