Offshore flexible line installation and removal

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United States of America Patent

PATENT NO 9976363
SERIAL NO

15037913

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Abstract

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A method of installing a flexible line between an offshore platform and a subsea structure and a method of removing a flexible line deployed between an offshore platform and a subsea structure. The method of installing includes at least partially deploying the line in the water using an installation vessel located outside of an exclusion zone in the vicinity of the platform, including lowering a topside end of the line either to the seabed or to an intermediate location between the seabed and the platform. The method further includes pulling the topside end to a position within the exclusion zone and winching the topside end up to the platform, and coupling the topside end to the platform. The method of removing includes decoupling a topside end of the riser from the platform, lowering the topside end from the platform and pulling the topside end to a position outside of an exclusion zone in the vicinity of the platform, and at least partially removing the line from the water using an installation vessel located outside of the exclusion zone, including raising the topside end of the line onto the installation vessel either from the seabed or from an intermediate location between the seabed and the platform.

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Patent Owner(s)

Patent OwnerAddress
STATOIL PETROLEUM AS4035 STAVANGER

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gravey, Guillaume Oslo, NO 2 3
Haug, Øyvind Lillestrøm, NO 2 3
Kristoffersen, Steinar Kolsås, NO 4 3

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