Equinor Energy As

Kristoffer Dahl

Kjell Einar Ellingsen

Bjørgulf Haukelidsæter Eidesen

Lorents Reinås

Morten Sæther

Harald Sigurd Nesse

Asle Eide

A method of installing a header pipe jointat a subsea structureis provided, comprising providing a header pipe jointhaving at least one valveinstalled therein and connecting the header pipe jointinline of a spoolor pipelineprior to lowering the header pipe jointto the subsea structure. The header pipe jointis then lowered to the subsea structure, and the valveis connected to the subsea structure (e.g. a subsea production system of the subsea structure such as a xmas tree) with a connection bridge e.g. a choke bridge. This provides a fluidic connection between the subsea structure and the header pipe joint. The subsea structurecomprises a foundation, e.g. suction anchors, which provide support for both a wellhead and the header pipe joint. A subsea assembly comprising a subsea structure, header pipe jointand connection bridgeis also provided.

Tie-in of subsea pipeline

A suction anchor for a subsea well is provided. The suction anchor includes a wellhead support structure. The wellhead support structure is at least in part external of the internal volume of the suction anchor.

Suction anchor for a subsea well

A method of installing a header pipe joint at a subsea structure is provided, comprising providing a header pipe joint having at least one valve installed therein and connecting the header pipe joint inline of a spool or pipeline prior to lowering the header pipe joint to the subsea structure. The header pipe joint is then lowered to the subsea structure, and the valve is connected to the subsea structure (e.g. a subsea production system of the subsea structure such as a xmas tree) with a connection bridge e.g. a choke bridge. This provides a fluidic connection between the subsea structure and the header pipe joint. The subsea structure comprises a foundation, e.g. suction anchors, which provide support for both a wellhead and the header pipe joint. A subsea assembly comprising a subsea structure, header pipe joint and connection bridge is also provided.

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Stavanger, Norway

Kristoffer Dahl