Insulating tubular conduit apparatus

Details Insulating tubular conduit apparatus Insulating tubular conduit apparatus

1984-05-17

1986-11-25

Callaghan, Thomas F.

Pipe joints or couplings

With casing, lining or protector

Insulated

138149, 285398, F16L 918

Patent

active

046244859

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.

REFERENCES:
patent: 1218895 (1917-03-01), Porter
patent: 1449773 (1923-03-01), Miller
patent: 3402731 (1968-09-01), Martin
patent: 3574357 (1971-04-01), Alexandru
patent: 3693665 (1972-09-01), Veerling et al.
patent: 4147381 (1979-04-01), Schwarz
patent: 4332401 (1982-06-01), Stephenson et al.
patent: 4340245 (1982-07-01), Stalder
patent: 4396211 (1983-08-01), McStravick et al.
patent: 4415184 (1983-11-01), Stephenson et al.

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