E - Fixed Constructions – 21 – B
Patent
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
Baker John R.
Chenoweth David V.
Mcstravick David M.
Baker International Corporation
Borden Ladner Gervais Llp
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