Borehole conduit cutting apparatus

An apparatus for use for severing a metal conduit located 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,
• said chamber having a plurality of apertures extending through said wall in a given plane at angularly spaced apart positions located 360 around said axis for providing passages from said chamber to the outside of said wall,
• a movable member located in said cavity and having at least one seal which engages said wall above said apertures,
• a combustible charge located in said chamber above and next to said movable member,
• an ignition means coupled to said chamber for igniting said combustible charge for creating a flame and hot combustion products for moving said movable member and said seal below said apertures to allow the passage of said flame and hot combustion products out of said apertures for severing the conduit.

An apparatus for use for severing a conduit located in a borehole extending downward into the earth, comprising:

• a body adapted to be lowered into the conduit to be severed,
• said body comprising a surrounding wall defining an elongated chamber with a central axis,
• said chamber having a plurality of apertures extending through said wall at angularly spaced apart positions located around said axis for providing passages from said chamber to the outside of said wall,
• a movable member located in said cavity and having means which forms a seal with said wall above said apertures,
• a combustible charge located in said chamber above and next to said movable member,
• an ignition means coupled to said chamber for igniting said combustible charge for creating a flame and hot combustion products for moving said movable member below said apertures to allow the passage of said flame and hot combustion products out of said apertures for severing the surrounding conduit.