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US 8,146,667 B2Granted
Dual gradient pipeline evacuation method
OwnerMarc Moszkowski, Benton Frederick Baughinventors
Life of this patent
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Abstract
The method of removing a first liquid from a subsea pipeline which has a central portion lower than each of the ends of the subsea pipeline by pumping a second lower density fluid into the pipeline and the either removing the second lower density fluid by either displacing it with gas or evaporating the second lower density fluid to a gas.
Claims6
The method of removing a first liquid from a subsea gas pipeline which has an intermediate portion which is lower than the ends of said subsea pipeline, comprising:
- displacing said first liquid from said subsea pipeline by pumping a second liquid into said pipeline, and
- allowing at least a portion of said second liquid to evaporate to a gas.
Dependencies are inferred from the claim text.