seabed-to-surface

Client: TNK Vietnam B.V. Location: Vietnam

Project Type: SURF & Pipelay

TNK Vietnam Lan-Do Field Development

A Joint Venture project between Subsea 7 and SapuraAcergy which delivered many firsts for both companies, and established TNK in their first offshore development, on the strength of Subsea 7’s ability to deliver projects safely, efficiently and on time.

The Lan-Do development was a subsea tie back to the existing Lan-Tay platform which feeds gas into the Nam Con Son Pipeline to Southern Vietnam. Subsea 7’s JV partners installed a 21km Pipeline and Subsea 7 completed all remaining subsea works for the tie-in off two gas wells to the platform. This involved engineering, procurement, transportation, installation and commissioning of the 21km pipeline, as well as controls Umbilical, PLET(s), Jumpers and Spoolpieces.

www.subsea7.com© Subsea 7, 2013. Information correct at time of going to press.

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TNK Vietnam Lan-Do Field Development

Umbilical Installation (Midline Connection)

SAT Diver Operations (198msw)

ROV Intervention Subsea Tree

ProjectLan-Do Field Development

ClientTNK Vietnam B.V.

Location390km southwest of Vung Tau, Vietnam

Water depth198m

Project TypeSURF and Pipelay

Date AwardedOctober 2011

Date CompletedOctober 2012

Vessels UtilisedRockwater 2 Sapura 3000 3rd party vessel

OverviewThe project included:

• Installation of 21km of 12-inch rigid pipeline (13% Chrome) c/w In-line skids

• Installation of 5 sections of umbilical (ranging from 4.4km to 6km) utilising an deck tensioner and reel drive system

• Rigid spoolpiece and rigid diverless jumper installation and metrology

• Installation of pipeline end terminations (PLET) structures (fabricated in Vietnam)

• Associated tie-ins and controls jumpers

• Pipeline Freespan rectification

• Pre-commissioning of Pipeline and Umbilical

• Commissioning support for start-up operations

• Dedicated Hyperbaric Support Facilities, setup and operation onshore in Vietnam.

A couple of firsts for SapuraAcergy : one was to install an Umbilical using Subsea 7 equipment and personnel on the Sapura 3000 in early June, the other was to lay the 13% Cr Pipeline. The Pipeline installation operations were supported by a Light Construction Vessel (LCV) on her first project. The Umbilical was installed immediately prior to the commencement of pipelay operations on the Sapura 3000 whilst the metrology and pipeline were completed using a LCV.

The Rockwater 2 commenced the diving works later in the year, which initially involved gelling the pipeline ends to avoid seawater ingress in 13% Cr pipe during the tie-in works. The diving activities took place at water depths of up to 198m for installation of the associated subsea infrastructure, another first for both the vessel and the APME Region. Upon completion of the diving works, the Rockwater 2 remained in field to complete the pre-commissioning and then commissioning to allow the introduction of gas.