Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1983-06-01
1984-04-24
Callaghan, Thomas F.
Pipe joints or couplings
With casing, lining or protector
Insulated
138149, F16L 918
Patent
active
044444206
ABSTRACT:
A concentric insulating tubular conduit member for use in forming a conduit string, such as a tubing string in a subterranean well, is disclosed. Each individual concentric conduit comprises an outer tubing and an outwardly flared inner tubing welded to the outer tubing at the end of the flared section. The inner tubing member is formed from an initially straight cylindrical member having enlarged ends and, when outwardly flared, the flared ends, although stretched, have a thickness at least equal to the nominal thickness of the inner tubular member. Insulation may be contained within the annular cavity between the inner and outer tubing members and between inner and outer coupling members at the juncture between adjacent tubing sections.
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Traynor, Bernard V., General Electric Company, "New Double-Walled Tubulars Can Aid Thermal Recovery Operations," Oil and Gas Journal, (Feb. 1980).
Chenoweth David V.
McStravick David M.
Baker International Corporation
Callaghan Thomas F.
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