Large head downhole chemical cutting tool

摘要

A downhole chemical cutting tool for use in a well bore to cut downhole conduits of large diameters, comprises a cutting head assembly (60) and an anchoring system (51). The tool includes an elongated tool body (14) having a chemical section (36) adapted to contain a chemical cutting agent and a cutting section (44) adapted to receivng the cutting agent from the chemical section. The cutting section has a plurality of externally upset cutting heads (60) extending circumferentially outwardly from the cutting section and terminating in outer surfaces having a desired effective diameter. Each of the cutting heads has a plurality of cutting ports extending radially inwardly from the outer cutting surface to a position where they are in fluid communication with an internal chamber within the cutting section. The tool further comprises expansible slip means (51) and expansible bow spring means in the elongated tool body for centering and anchoring the tool within the conduit as cutting agent is dispelled from the cutting ports.