Wells – Processes – Assembling well part
Patent
1991-09-16
1992-11-03
Novosad, Stephen J.
Wells
Processes
Assembling well part
166 57, 166 97, 166302, 166380, 285 21, 169 69, E21B 2902, E21B 3303, E21B 3500, F16L 1302
Patent
active
051599830
ABSTRACT:
An apparatus and method for capping a burning or blown out oil or gas well are disclosed. A pipe is placed over a flange and casing on a wellhead and welded thereto using thermite welding. The thermite reaction occurs in one or more crucibles mounted to the pipe. Graphite feeders direct the molten metal produced by the reaction into apertures near the bottom of the central pipe. The feeders join the pipe at an angle such that the molten metal flows into the annular space between the interior of the pipe and the wellhead structure in a generally circular flow pattern. A malleable clamp to conform to the configuration of the pipe and flange is provided to hold the pipe in place over the flange and act as a mold for the molten metal during the welding process. After the weld has formed, a valve in the pipe is closed, which simultaneously shuts off the flow of oil and extinguishes the fire by depriving it of oil, its fuel.
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Welding Handbook, 8th ed., R. L. O'Brien, ed., vol. 2, Welding Processes, American Welding Society, 1991, Chap. 29, "Other Welding Processes", pp.892-900.
Broco Systems Ultra-Thermic rod Brochure, 2 pages.
Barron Andrew R.
Cronin, Jr. Dennis F.
Manson Paul R.
Arthur D. Little Enterprises, Inc.
Novosad Stephen J.
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