| 摘要 |
A conduit is formed for use in the production of oil or gas, the conduit (120) including an inner tube and an outer tube coaxial with the inner tube. A heating element (125) is secured to the outer surface of the inner tube and the outer tube applied to the inner tube and heating element by extrusion. The inner tube is formed as an extrudate. The heating element (125) has a substantially longitudinal planar form, and is wrapped upon the inner tube. A gas impermeable layer is formed on the outer tube by wrapping one or more substantially planar longitudinal gas impermeable sheets around the outer tube.
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