Borehole conduit cutting apparatus and process

Details Borehole conduit cutting apparatus and process Borehole conduit cutting apparatus and process

2005-12-06

2005-12-06

Bagnell, David (Department: 3672)

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

C166S055000, C166S063000

Reexamination Certificate

active

06971449

ABSTRACT:
The apparatus is used for cutting an opening through the wall of a conduit located in a borehole traversing the subsurface formations. The apparatus includes a body adapted to be lowered into the conduit to a desired level. The body is formed by a cylindrical wall defining an elongated chamber having a combustible charge receiving portion and an ignition portion located close to the combustible charge receiving portion. A plurality of spaced apart apertures are formed through the wall defining a given pattern which may be at least one elongated row of apertures generally parallel with the axis of the cylindrical wall or a line which encloses a given configuration on one side of the axis. A combustible charge is located in the combustible charge receiving portion of the chamber, and an ignition device is located in the ignition portion of the chamber for igniting the combustible charge for creating a flame and hot combustion products for passage through the apertures for cutting the wall of the conduit to form an opening through the wall of the conduit. In the preferred embodiment, the combustible charge is located in the chamber above, at the level and below the apertures.

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