Large head downhole chemical cutting tool

摘要

A downhole chemical cutting tool for use in a well bore to cut large diameter conduits including an elongated tool body having a chemical section adapted to contain a chemical cutting agent and a cutting section adapted to receive the cutting agent from the chemical section. The cutting section has a plurality of externally upset cutting heads extending circumferentially outwardly from the cutting section and terminating in outer cutting surfaces. Each of the cutting heads has a plurality of cutting ports extending radially inwardly from the outer cutting surface and in fluid communication with an internal chamber within the cutting section. The tool further comprises expansible slip and bow spring means in the elongated tool body for centering and anchoring the tool during cutting. The cutting heads are of a configuration having an inner spoke section which has a central bore opening into the interior chamber of the cutting section and a disk section secured to the outer portion of the spoke section. The cutting ports are located in the disk section and extend into fluid communication with the central bore within the spoke section. The central bore of the spoke section contains an accumulation of permeable ignitor material. The spoke and disk portions of the cutting heads preferably are formed as separate components secured through threaded connections.