DEVICE FOR CHAIN SEQUENTIAL CUMULATIVE PERFORATION OF SPACED OIL AND GAS FORMATIONS Russian patent published in 2024 - IPC E21B43/117 E21B43/1185 

FIELD: oil and gas industry.

SUBSTANCE: case-type cumulative bore hammers. A device for chain sequential perforation of spaced oil and gas formations or intervals of one formation, lowered on tubing, contains sections of the perforator installed opposite the opening intervals, configured to be excited by liquid pressure, and a unit for generating a response pressure pulse of the underlying section of the bore hammer. Each section of the bore hammer has a housing in the lower part with holes to equalize the liquid pressure. A solid propellant charge is installed in a housing with holes, and a pressure pulse formation unit is placed inside the solid propellant charge. In the bottom part of the body of the pressure pulse formation unit there is an amplifying charge connected to a detonating cord extended to it through the upper section of the bore hammer from the explosive hydraulic head. The reinforcing charge is introduced into the central channel of the solid fuel charge to a depth not less than the length of the reinforcing charge, and the amount of solid propellant charge allows, when the detonating cord and the reinforcing charge are activated, to provide a pressure in the tubing that exceeds the hydrostatic pressure in the well by at least 15 MPa.

EFFECT: increasing the efficiency of opening in one run of oil and gas formations separated over long distances or intervals of one formation with reliable operation due to a combination of fire and hydraulic connections.

1 cl, 2 dwg