Patent ID: 7909100

Claim:
An apparatus for severing multiple tubulars in a well bore, comprising: an elongated hollow body adapted for receiving torque from an external rotational source, said body having a first end and a second end, said hollow body comprising a pair of opposing longitudinal slots formed in a sidewall of said hollow body to allow passage of a pair of cutter blades in opposite directions therethrough; a means for pivotally securing a first set of cutter blades proximal a first end of said body, formed in said body; a first set of cutter blades pivotally secured adjacent a first end of said body, by said means for pivotally securing said first set of cutter blades, said cutter blades comprising cutting surfaces formed on at least one side of the cutter blades; a means for pivotally securing a substitute set of cutter blades on said tool body, formed proximal a second end of said body; a means for pivotally moving said first set of cutter blades from an idle position recessed in said hollow body to a position wherein said first set of cutter blades are in cutting contact with a tubular wall, said means comprising a central opening in said hollow body, said central opening having a first section in an uppermost position when said body is positioned in a well bore, and a first piston assembly slidably mounted in said first section, said first piston assembly being actuated by a downward force acting on said first piston assembly and moving same into operable contact with said first set of cutter blades, said central opening further comprising a second section, spaced apart from said first section, for accommodating a second piston assembly when said apparatus is inverted in said well bore, said second piston assembly having an actuating direction opposite to that of said first piston assembly.