DEVICE FOR CUTTING OR PERFORATING PIPES IN A WELL Russian patent published in 2023 - IPC E21B29/02 E21B43/11 

FIELD: oil and gas industry.

SUBSTANCE: device for cutting or perforating pipes in a well contains a gas generator, including a housing in which the initiator of ignition of the thermite mixture located underneath is installed from top to bottom. Under the thermite mixture in the body, there is a conical divider fixed in the body and made of heat-resistant material, gas distribution grilles and a bushing guiding hot gases. A guide rod is fixed under the bushing, on which a protective cover is installed sealed relative to the guide rod with the option of axial movement. The device is equipped with a cable lug, an electromechanical anchor, a centralizer, a collar locator, a geophysical weight, an insulating sub and a compensator arranged in series from top to bottom and fixed relative to each other. The gas generator is located between the insulating sub and the compensator. The thermite mixture is made in the form of a monolithic cylindrical unit with a central axial hole. The ignition initiator designed as an electric incandescent coil, which is heated to a temperature of 1000±200°C when connected to a current source. The incandescent gas guide bushing is designed with an upper end surface in the form of a cylindrical bushing, the outer side surface of which smoothly merges into a flat horizontal surface, with the formation of an outlet annular hole with the gas distribution grid above. The incandescent gas guide bushing can also be designed with an upper end surface in the form of a cylindrical bushing, the outer side surface of which smoothly merges to a flat horizontal surface, with a cylindrical wall along the perimeter, the upper end surface of which is tightly pressed against the lower end surface of the gas distribution grid located above. Through holes are made in the wall of the cylindrical wall.

EFFECT: increased reliability of operation and increased productivity of the device during the operation of transverse cutting and/or perforation of casing pipes in the well.

1 cl, 4 dwg