Calgary-based Husky Energy has hit the market with a prequalification inquiry to build a 172,000-tonne concrete gravity structure (CGS) for a wellhead platform destined for its West White Rose oil project off Newfoundland, Canada.
Initial responses are due next week, with the contract award expected late this year to tie in with project sanction and construction due to start in April 2014.
First oil from West White Rose, which is estimated to hold about 110 million barrels of oil, is currently targeted for the third quarter of 2016.
UK-based Arup completed pre-front-end engineering and design work on the CGS in the third quarter of last year.
The company has now begun FEED studies that are due to end this March. It is likely to be well positioned to undertake detailed engineering.
One source suggested Arup will likely form a consortium to bid for the West White Rose CGS turnkey contract much as it did — successfully — for a similar structure built more than a decade ago for Shell’s Malampaya field off the Philippines.
Arup teamed up with John Holland Group and Van Oord ACZ to land this Filipino CGS order.
Contractors such as Doris Engineering and Kvaerner may also make a play for the West White Rose contract.
Husky’s prequalification exercise would strongly suggest that, while a subsea solution officially remains a possibility to develop West White Rose, the favoured option is a wellhead platform. The CGS would be fabricated at a new graving dock to be established at Argentia on Newfoundland’s Avalon Peninsula adjacent to Placentia Bay.
Construction of this new facility will be the subject of a separate bidding exercise.
The CGS will support a 14,000-tonne topsides which is set to attract the attention of South Korean fabricators Samsung Heavy Industries, Daewoo Shipbuilding & Marine Engineering and Hyundai Heavy Industries.
Industry sources said Husky has already made informal market inquiries, suggesting a prequalification exercise will start within the next few months.
The deck and CGS will be mated at a deep-water site in Placentia Bay after which they will be hooked up and commissioned before being towed to the field location for installation.
The base structure, or caisson, of the CGS will rise to a height of about 50 metres. From the centre of the caisson will rise an 85-metre high tapering, cylindrical shaft.
About 64,000 cubic metres of concrete will be needed to slipform this structure, equivalent to about half the size of concrete gravity bases for the Hibernia and Hebron platforms,
The platform will likely be designed to handle almost 50,000 barrels per day of oil plus 2.5 million cubic metres per day of gas as well as 10,500 bpd of produced water and 25,000 bpd of injected water.
It will also be designed with 20 well slots capable of supporting 40 wells.