Recovery and repair of offshore pipelines
Patent
·
OSTI ID:6984083
The end of an underwater pipeline is recovered from the bottom of a body of water by inserting a pigging element into the end of the pipeline, injecting a gas into the end of the line behind the pigging element until a section of the line sufficiently long to reach to the surface of the body of water has been voided of liquids, and thereafter lifting the end of the line to the water's surface. Apparatus which is particularly useful in such recovery operations includes a housing closed at one end and open at the other, a gas inlet in the housing near the closed end, means near the open end for engaging the end of a pipe and forming a seal therewith, a pigging element in the housing between the gas inlet and open end, and means for attaching a cable to the end of the pipeline for lifting the pipeline to water's surface. (20 claims)
- Assignee:
- Esso Production Res. Co.
- Patent Number(s):
- US 3751932
- OSTI ID:
- 6984083
- Country of Publication:
- United States
- Language:
- English
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