Subsea Wellheads & Xmas Tree

[Mohammed]

Subsea wellheads are machined, forged steel housing welded to the surface casing of a subsea well to which a BOP or a subsea tree may
be connected for controlling the well and containing well pressures during drilling and production operations.

[Lucas]

Surface Conductor

Surface conductor is the first casing installed for guiding the drill bit when a well is first started (usually 30”). It may be driven, jetted or drilled into place.

[Mohammed]

Surface Tie Back System

Surface tie back are systems of special connectors and casing for extending the well casing from a mudline suspension system to a surface completion.

[Lucas]

Temporary Guide Base

Temporary guide base are fabricated steel structure with an opening and guide funnel at its center used for guiding the surface conductor into place when first starting a well, or for guiding the bit if the surface conductor is to be drilled into place.

[Lucas]

Through Flowline (TFL)
TFL’s are specialized well workover system using special tools designed to be pumped through the production flowline and down the production tubing.

[Lucas]

Through Bore Tree
Through bore tree’s are subsea tree with the production bore passing vertically through the tree body and the tubing hanger in the tree body.

[Kelvin]

Tree Connector
Tree connectors are mechanism at the base of the tree that connects the tree to the wellhead by means of a hydraulic or mechanical actuator.

[Lucas]

Tree Mandrel

Tree mandrel are machined hub at the top of a dual bore subsea tree for connection of the tree running tool or the LMRP and gaining access to the tree bore.

[Lucas]

Tree Running Tools

Tree running tools are specially designed tool used for lowering the subsea tree onto the wellhead and actuating the tree connector or, inversely, for removing the tree from the wellhead. For dual bore trees it is sometimes incorporated into the LMRP.

[Author]

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