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frst such system to boost production of of operation. In 2009, the feld’s average Both felds are located about 300mi a mature feld that also includes the rein- crude oil production was 63,000boe/d, off the coast and are expected to last jection of previously-removed water. 14% less than the previous year and between 30-40 years. 56.25% less than its average production Unlike Draugen, the Jack-St. Malo proj-

Subsea

OneSubsea from fve years earlier. ect is not a case of revitalizing an older

OneSubsea has several projects currently OneSubsea will develop four new pro- feld but maximizing potential produc- underway in the area of full wellstream duction wells in the feld. These wells tion in an untapped feld. OneSubsea subsea boosting that are expected to are located at a depth of 879ft, and all is contracted to build a 12-well system, begin production either later this year or of them will be routed to a new pump along with a centrifugal pump and early next year. located between the platform and the related control systems. It plans to boost

Notable among these projects is reservoir. This pump is a helicon-axial production on the seabed as a way

Draugen feld, located in block 6407/9 pump with two units. increase recovery rates on a feld that has in the Haltenbanken area, approximately The subsea boosting pump at Draugen yet to draw frst oil. 87mi north of Kristiansund, Norway (OE: is scheduled for a June installation, and The pump is a single-phase pump

June 2013). The feld was discovered in the new wells are expected to be opera- operating on 3Mw shaft power, with a 1984 and production began in 1993. It tional 3Q 2014. 13,000 psi pressure rating and a 4000psi currently consists of 13 production wells Also scheduled to wrap up this year is boost, which makes it capable of process- – seven of them subsea. Jack-St. Malo, a new project that com- ing up to 60,000b/d.

This is not OneSubsea’s frst foray

The Garn West Reservoir ties back to bines two felds located in the lower into Jack-St. Malo. In 2009, it delivered the Draugen platform through a 2.05mi tertiary trend of the Gulf of Mexico. The a subsea tree system that incorporated pipeline. Gas exports are transported Jack feld is in Walker Ridge blocks 758 multiphase fowmeters and sampling through the Åsgard Transport pipeline and 759. Chevron holds a 50% interest of its Multiple Application Reinjection to Kårstø. Norske Shell is the operator of in the feld, which has a water depth of

System (MARS), its frst such system the feld, owning a 26.20% stake. Petoro 7201ft. Maersk has a 25% stake in Jack, to do so. MARS is a universal interface owns a plurality stake at 47.88%, with as does Statoil. that, according to a company manual,

BP Norge and Chevron making up the St. Malo is not nearly as deep–only enables “the connection of production rest. 2100ft. It is also operated by Chevron, optimization systems to be installed

As with any aging feld, production which owns 51%. Petrobras (25%), easily in the feld, either on or off the at Draugen had dropped off precipi- Statoil (21.50%), ExxonMobil (1.25%), subsea tree.” tously heading into its second decade and ENI (1.25%) are the other partners.

Illustration of the subsea boosting project on

Shell’s Draugen feld in the Norwegian Sea.

Image from Shell

May 2014 | OE oedigital.com 92 090_OE0514_Subsea1_Whitfield.indd 92 4/19/14 9:31 AM