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US 6,714,018 B2Granted
Method of commissioning and operating an electrically heated pipe-in-pipe subsea pipeline
AssigneeShell Oil Company
InventorRonald M. Bass
Life of this patent
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Abstract
Methods for determining electrical and thermal properties of a heated pipeline are provided. During commissioning or at any time thereafter, a base curve of impedance versus temperature of the pipeline is determined, so that impedance measurements can thereafter be used to measure temperature of the pipeline. Continuous monitoring of impedance is provided to detect changes in conditions of the pipeline. Start-up procedures that decrease risk of damage to the annulus from arcing are disclosed.
Claims6
A method for determining electrical and thermal properties of an electrically heated pipe-in-pipe pipeline, comprising:
- at a first temperature, applying a range of voltage to the pipeline and measuring impedance over the range of voltage to establish a baseline range of impedance for the pipeline at the first temperature.
Dependencies are inferred from the claim text.