Chemical cutting method and apparatus

Wells – Means for perforating – weakening – bending or separating pipe... – With disparate below ground feature

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166212, 166297, E21B 2902

Patent

active

046193189

ABSTRACT:
A downhold chemical cutting process for cutting a target object within a well. A source of a gaseous chemical cutting agent comprising a nitrogen fluoride is introduced into the well adjacent the target object and employed in a cutting operation in which the nitrogen fluoride cutting agent is directed against the target to the cut. A gaseous cutting agent source such as a mixture of florine and nitrogen trifluoride may be employed. Alternatively a perfluoroammonium salt which decomposes upon heating to produce a mixture of florine and nitrogen fluoride may be employed. A cutting tool comprising pressure actuated anchoring means, pressure generating and chemical sections, and a cutting section having a downwardly extending nozzle. The nozzle is provided with a standoff sleeve to provide a desired distance between the target object to be cut within a well bore and the nozzle outlet. A compound piston may be slidably disposed within the chemical section of the tool to prevent comingling between pressurizing fluid developed in the tool and a chemical cutting agent contained within the chemical section.

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patent: 4494601 (1985-01-01), Pratt et al.

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