Insulating tubular conduit apparatus and method

Details Insulating tubular conduit apparatus and method Insulating tubular conduit apparatus and method

E - Fixed Constructions

21

B

166/51

E21B 17/01 (2006.01) E21B 17/00 (2006.01) E21B 36/00 (2006.01) F16L 59/15 (2006.01)

Patent

CA 1181000

ABSTRACT OF THE DISCLOSURE A concentric insulating tubular conduit member for use in forming a conduit string, such as a tubing string in a subter- ranean 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 cylin- drical 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.

403092

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