PIPE CUTTER Russian patent published in 1997 - IPC

FIELD: oil and gas production industry. SUBSTANCE: device is intended for cutting pipes inside oil, gas and other wells. For effective cutting of drill pipes with thick walls with simultaneous reduction of their radial deformation and less mass of explosive charge, explosive charge is located between upper and lower metal plugs with no clearance. Axial hole in charge is blind to half of charge height. Initiating system is installed with its lower end face on bottom of blind hole in charge. Relation of thickness of each metal plug Δ to diameter of charge d_ch is within interval of . Relation of charge height h_ch to diameter of charge d_ch is within interval of . EFFECT: high efficiency. 1 cl, 2 dwg