Improvements relating to abandonment and recovery of pipelines
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United States of America Patent
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May 30, 2017
Grant Date -
Dec 31, 2015
app pub date -
Feb 6, 2014
filing date -
Feb 6, 2013
priority date (Note) -
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Abstract
A method of abandoning a pipeline during subsea pipelaying from a pipelay vessel includes suspending the pipe string from a tendon element of an abandonment string and engaging further tendon elements to an upper end of the abandonment string while lowering the pipe string to a handover depth. At the handover depth, tension is applied via a wire to the top of the pipe string at an acute angle to the launch axis. This deflects the pipe string from the launch axis into axial alignment with the wire to transfer the weight load of the pipe string to the wire, whereupon the abandonment string can be decoupled from the pipe string. Recovery of the pipeline from the seabed can be effected by a reverse process.
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