Chemical cutting apparatus for use in wells

Details Chemical cutting apparatus for use in wells Chemical cutting apparatus for use in wells

1978-10-20

1979-12-25

Novosad, Stephen J.

Wells

Means for perforating, weakening, bending or separating pipe...

With disparate below ground feature

166 58, 166 63, 166212, E21B 2900

Patent

active

041801318

ABSTRACT:
A chemical cutting apparatus and method for cutting objects in well bores such as, for example, tubing in the bore of an oil or gas well. The apparatus is properly positioned and an igniter is fired activating a gas generator. The resultant pressure axially displaces a slidable piston having one or more wedges pivotally connected thereto. Movement of the piston anchors the apparatus relative to the object to be cut. The pressure is then communicated through the slidable piston forcing a chemical cutting agent into a chamber containing a reactant. The resultant reaction increases the pressure and temperature thereby displacing along the axis a second slidable piston. Movement of the second slidable piston exposes radial exhaust orifices thereby allowing the reacting elements in the chamber to escape with great velocity and to contact the object to be cut. The second slidable piston is then held firmly in place. The chamber containing the reactant and the member having the radial exhaust orifices are made of a suitable material which will not enter into the reaction.

REFERENCES:
patent: 2629445 (1953-02-01), Dill
patent: 2918125 (1959-12-01), Sweetman
patent: 3076507 (1963-02-01), Sweetman
patent: 3138207 (1964-06-01), Peppers
patent: 3318395 (1967-05-01), Messmer

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