Subsea Trees

Subsea trees are structures attached to the top of subsea wells to control the flow of oil / gas to or from a well. When attached to a subsea well the combined structures can extend to 7 metres above the seabed in height.

They are made up of pipework and valves within a supporting steel framework and present a substantial hazard to towed fishing gear. When several subsea trees and associated wells are used as a group they are placed on a structure called a template.

Subsea tree

The image below shows a structure currently positioned on some subsea wells. A subsea tree and manifold are enclosed within this protective structure. This is typical of many subsea structures on the UK Continental Shelf. The size of this structure, approximately 9 metres tall, can be seen from this photograph. The associated pipeline connections and other seabed infrastructure connected to such structures emphasise the need for protective safety zones around all seabed structures.

Subsea equipment contained within a protective structure

To download the latest oil & gas fishing plotter files, please visit the Download page and view the data on the offshore map by clicking here.

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