Insulated prestressed conduit string for heated fluids
An improved prestressed conduit string is disclosed 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.
- Assignee:
- Conoco Inc
- Patent Number(s):
- US 4340245
- OSTI ID:
- 6979865
- Country of Publication:
- United States
- Language:
- English
Similar Records
Insulating tubular conduit
High temperature packer for well conduits
Related Subjects
020300 -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
04 OIL SHALES AND TAR SANDS
040300 -- Oil Shales & Tar Sands-- Drilling
Fracturing & Mining
15 GEOTHERMAL ENERGY
150901* -- Geothermal Engineering-- Drilling Technology & Well Hardware
BOREHOLES
CAVITIES
DESIGN
ENERGY TRANSFER
FLUID FLOW
FLUIDS
HEAT TRANSFER
HEATING
PIPES
THERMAL INSULATION