Method of making insulated tubular conduit

Details Method of making insulated tubular conduit Method of making insulated tubular conduit

1983-07-13

1984-11-06

Goldberg, Howard N.

Metal working

Method of mechanical manufacture

Assembling or joining

138149, 285 47, B21D 3900, D03D 4926, F16L 1112

Patent

active

044803710

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: 3574357 (1971-04-01), Alexandru et al.
patent: 3711124 (1973-01-01), Gerholt et al.
patent: 3928903 (1975-12-01), Richardson et al.
patent: 3943618 (1976-03-01), Perkins
patent: 4240850 (1980-12-01), Arntz
patent: 4332401 (1982-06-01), Stephenson et al.
patent: 4340245 (1982-07-01), Stadler

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