Borehole conduit cutting apparatus

Details Borehole conduit cutting apparatus Borehole conduit cutting apparatus

1999-05-04

2001-02-13

Bagnell, David (Department: 3672)

Wells

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

C166S297000

Reexamination Certificate

active

06186226

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an apparatus for cutting conduit located in a borehole formed in the earth.
2. Description of the Prior Art
U.S. Pat. Nos. 4,298,063, 4,598,769, and 5,435,394 disclose apparatus for cutting or severing conduit located in a borehole formed in the earth. U.S. Pat. Nos. 4,598,769 and 5,435,394 are incorporated into this application by reference.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a new and useful apparatus for cutting or severing a conduit located in a borehole formed in the earth. The conduit may be a drill pipe, production tubing, coiled tubing, casing, etc. The apparatus of the invention comprises a body adapted to be lowered into the conduit located in the borehole. The body comprises a surrounding wall defining an elongated chamber having a lower portion, an intermediate portion, and an upper portion. The lower portion defines a cavity with a plurality of angularly spaced apart apertures extending through the wall of the body. A moveable seal means is located in the cavity between the apertures and the lower end of the intermediate portion. A combustible charge is located in the intermediate portion and an ignition means is coupled to the upper portion for igniting the combustible charge for creating a flame and hot combustion products for moving the seal means below the apertures for passage of the flame into the cavity and out of the apertures for cutting or severing the surrounding conduit.


REFERENCES:
patent: 4298063 (1981-11-01), Regalbuto et al.
patent: 4345646 (1982-08-01), Terrell
patent: 4352397 (1982-10-01), Christopher
patent: 4494601 (1985-01-01), Pratt et al.
patent: 4598769 (1986-07-01), Robertson
patent: 5435394 (1995-07-01), Robertson

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