E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
285/53, 166/68
E21B 17/14 (2006.01) F16L 59/18 (2006.01) F16L 59/21 (2006.01)
Patent
CA 1162477
Case 6600 IMPROVED INSULATED PRESTRESSED CONDUIT STRING FOR HEATED FLUIDS Abstract of the Disclosure 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 re- duce heat transfer from the conducted fluids and prevent deformation of the conduit string when heated. By the pre- sent 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 extend- ing ends of the conductor tubes of adjacent conduit sections and coupling means positioned around the seal means and con- nected 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.
376499
Conoco Inc.
Ridout & Maybee Llp
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