Patent ID: 6186226
Filing Date: 2001-02-13
Classification: E21B

Abstract:
An apparatus for use for severing a metal conduit disposed in a borehole extending downward into the earth, comprising:a body adapted to be lowered into the metal conduit to be severed,said body comprising a surrounding wall defining an elongated chamber with a central axis and having a lower portion, an intermediate portion, and an upper portion,said lower portion defining a cavity with a plurality of apertures extending through said wall in a given plane at angularly spaced apart positions located 360.degree. around said axis for providing passages from said cavity to the outside of said wall,a combustible charge located in said intermediate portion,a movable seal means located in said cavity above said apertures next to and below said combustible charge, andan ignition means coupled to said upper portion for igniting said combustible charge for creating a flame and hot combustion products for moving said movable seal means in said cavity below said apertures for passage of said flame and hot combustion products into said cavity and out of said apertures for severing the surrounding metal conduit.