04340245 is referenced by 63 patents and cites 8 patents.

An improved prestressed conduit string for conducting heated fluids through a well bore comprised of a plurality of concentric double wall tube conduit sections each including an inner heated fluid conductor tube in tension prestress and a larger diameter outer tube in compression prestress to reduce heat transfer from the conducted fluids and prevent deformation of the conduit string when heated. By the present invention, the outer tubes of the conduit sections are shorter than the conductor tubes thereof whereby the ends of the conductor tubes extend short equal distances beyond the ends of the outer tubes. Connector means for connecting the conduit sections together in end-to-end relationship thereby forming the conduit string are comprised of annular resilient seal means positioned around axially aligned adjacent extending ends of the conductor tubes of adjacent conduit sections and coupling means positioned around the seal means and connected to the outer tubes of adjacent conduit sections thereby rigidly connecting the sections together and compressing the seal means against the sides of the adjacent extending ends of the conductor tubes and forming a sealed heat insulated joint between the conduit sections.

Title
Insulated prestressed conduit string for heated fluids
Application Number
6/171765
Publication Number
4340245
Application Date
July 24, 1980
Publication Date
July 20, 1982
Inventor
John L Stalder
Ventura
CA, US
Agent
A Joe Reinert
Assignee
Conoco
OK, US
IPC
F16L 59/16
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