Page 50: of Offshore Engineer Magazine (Jul/Aug 2013)

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Production

Quad 204 takes shape subsea

BP’s Quad 204 redevelopment

The subsea architecture on the will be one of the largest subsea

Quad204 redevelopment.

developments in the UKCS.

By Andrew Train, BP’s project director, The Schiehallion FPSO has been moored in 400m of water, 281km (175 offshore program and Wood Group miles) west of the Shetland Isles, pro-

Kenny director, Bob MacDonald ducing oil from the Schiehallion and

Loyal felds since 1998. The reservoir uad 204 is one of the world’s biggest subsea redevelopment projects, sits 2000m below the seabed, cover-

Q and one of the most complex engineering challenges BP and its project ing an area of approximately 194sq km partners have ever undertaken. (75sq mi.) As a result of new explora-

It involves redevelopment of the Schiehallion and Loyal felds, to the west of tion activity and the technological developments that have occurred

Shetland on the UK Continental Shelf (UKCS). Wood Group Kenny is responsi- since it was discovered 20 years ago, ble for engineering the subsea, umbilical, riser and fowline (SURF) system, from recoverable reserves are now known the subsea trees to the connections within the new Schiehallion foating produc- to be more than double the original tion, storage and offoading (FPSO) vessel. estimates.

Accessing these reserves has

Wood Group Kenny will also support BP through the delivery, testing, instal- required a major expansion of what lation and commissioning of these systems, which represent approximately was already a sizeable subsea develop-

US$1 billion worth of subsea production systems, umbilicals, pipeline and risers ment and one of the largest oil produc- infrastructure. ing felds on the UKCS. The original development has already expanded to

As the project reaches a key milestone, with preparations nearing comple- comprise 51 wells in fve subsea drill tion for the Schiehallion FPSO tow away, Andrew Train, BP’s project director, centers, and the Quad 204 redevelop- offshore program and Wood Group Kenny director, Bob MacDonald look at some ment project is adding 25 more wells. of the challenges involved in a subsea project of this scale and discuss how they The addition of the new wells will signifcantly extend the life of the feld, think it could beneft the subsea industry as a whole.

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