BOREHOLE MAGNETIC CATCHER Russian patent published in 2025 - IPC E21B31/06 

FIELD: mining.

SUBSTANCE: invention relates to equipment and tools for repair of oil and gas wells, namely for lifting from wells of emergency ferromagnetic elements. Device has a cylindrical housing made from ferromagnetic material, permanent magnets fitted in a nonmagnetic cup, a magnetic core made from magnetically soft material surrounding the permanent magnets. Permanent magnets are installed between lower and upper yokes. Magnetic conductor is connected to upper yoke and made with possibility of sliding along inner surface of housing. At lower end of housing there is a sealing assembly, at lower end of device there is a pocket filled with pasty mass. Upper yoke is connected through cam connection to movable rod of linear displacement electric drive. Electric drive with its upper end is connected to logging cable through tip. Adapter of housing is connected to flange of lower end of electric drive, in which chambers are made, which are cylinders for free movement in them of pistons of separation of media, which are oil in upper part of chambers and borehole fluid in lower part of chambers.

EFFECT: improving operating efficiency of the borehole magnetic catcher and operational efficiency, especially during well repair.

1 cl, 3 dwg