IMPULSIVE HYDRAULIC FRACTURING METHOD Russian patent published in 2019 - IPC E21B43/26 

FIELD: mining.

SUBSTANCE: invention relates to mining and can be used to develop and restore the flow rate of production wells, that has decreased as a result of the wall packing of the borehole zone of the asphalt-resin-paraffinic formations and mechanical impurities. Technical essence lies in the fact that, applying the method of performing pulsed fracturing, including the injection of liquid into the well cavity, formation of periodic pressure pulses in the wellbore zone in the form of a wave moving through the cavity of a well, which is formed during a periodic increase in pressure in the well by connecting to the first and second sources of fluid under pressure using the first and second valves, during hydraulic fracturing, the time of movement of the fluid mass moving from the wellhead to the bottomhole zone and the duration of expansion and closure of formation cracks are estimated in advance; the initial pressure is established in the cavity of the well, in which the fractures of the reservoir are closed, open the first valve, raise the pressure in the bottomhole zone sufficient to open the fractures of the reservoir, then open the second valve for the time necessary for the shock wave to reach the bottomhole zone, penetration into the open cracks of the reservoir and their development and branching, then both valves are closed for the period of pressure reduction in the well to the initial value, hydropneumatic accumulators are connected to the lines connecting the valves topping up the fluid with sources of the fluid under pressure, the volume of which is determined by the flow rate of the well fluid as it flows into the formation, the first source contains fluid under pressure sufficient to open the fractures, the second under the pressure required for fracturing.

EFFECT: object of the invention is to transfer the shock wave to the reservoir massif to the maximum possible distance from the well bore through existing cracks.

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