Page 23: of Offshore Engineer Magazine (Feb/Mar 2015)

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Analysis requirements, Knudsen says. However, AC

Rig stats power is being stretched

Worldwide beyond 150km for Total’s

Rig Type Total Rigs Contracted Available Utilization

Martin Linge develop-

Drillship 113 92 21 81% ment, which will use a 424 356 6883%

Jackup 161km-long high voltage 181 157 24 86%

Semisub

AC cable (145kV/55MW) 34 21 13 61%

Tenders from Kollsenes, Norway.

Total 752 626126 83%

In 2005, power

Gulf of Mexico from shore via ABB’s

Rig Type Total Rigs Contracted Available Utilization “HVDC Light” link was

Oistein Johannessen, VP

Drillship 35 32 3 91% launched on Troll A for communications, DPN, Statoil. 89 64 25 71%

Jackup pre-compression. ABB is 28 24 4 85%

Semisub now working to provide

N/A N/AN/A N/A

Tenders a further 100MW to Troll using its HVDC Light to power two 152 120 32 78%

Total compressor drive systems.

Asia Paci? c

A 98km-long, 90kV AC cable was used to provide 40MW of

Rig Type Total Rigs Contracted Available Utilization power to the Gjøa platform, which was developed by Statoil

Drillship 17 10 758% and now run by GDF Suez. It started up in 2010 and was the

Jackup 118 105 13 88% ? rst ? oating platform to be supplied with power from shore. 38 27 11 71%

Semisub

ENI’s Goliat, also a ? oating facility, will get 75MW via a 105km, 24 12 1250%

Tenders 123kV AC cable. 197 154 43 78%

Total

In 2013, BP’s Valhall ? eld was the ? rst 100% powered from

Latin America shore offshore platform, via a nearly 300km, 150kV, HVDC cable

Rig Type Total Rigs Contracted Available Utilization from Lista, with conversion to AC at Valhall to provide 80MW.

Drillship 25 25 0100%

BP had investigated power from shore in 2000, initially as

Jackup 9 7 2 77% a regional solution, supporting UK and Norwegian North Sea 35 34 1 97%Semisub platforms. But, the project resulted in just Valhall having power

Tenders 2 2 0100% from shore. “We have been involved for 13-14 years,” Olav

Total 71 68 395%

Fjellsa, director of communications, BP Norge said at ONS.

Northwest European Continental Shelf “The ? rst estimates were really very high and there was a large

Rig Type Total Rigs Contracted Available Utilization debate to drive down costs to get the cost we ended up with.

Drillship 1 0 1 0% 51 48 3 94%

Jackup

Semisub 47 44 3 93%

Gjøa would have

N/A N/AN/A N/A

Tenders needed four N2520 99 92 7 92%

Total gas turbines. It still

Middle East & Caspian Sea needs one, for gas

Rig Type Total Rigs Contracted Available Utilization export, but waste heat

Drillship 1 0 1 0% recovery is used on 108 93 1586%

Jackup this unit.

Semisub 3 3 0100% “When we started

N/A N/AN/A N/A

Tenders it, there was uncer-

Total 112 96 16 85% tainty about how much

Sub-Saharan Africa downtime there would

Rig Type Total Rigs Contracted Available Utilization be due to power from

Drillship 26 21 580% shore. Nearly four 24 19 5 79%

Jackup years in and operation-

Semisub 16 14 2 87% GDF Suez’s Gjoa facilities. ally, we have had a very 8 7 1 87%

Tenders

Image from Statoil.

good experience with

Total 74 61 13 82% reliability. We have had

Rest of the World two shutdowns due to power from shore. The ? rst one we were

Rig Type Total Rigs Contracted Available Utilization warned up front about. This was for testing at Mongstadt. The

Drillship 8 4 450% other was due to thunder and lightning onshore and we were able 25 20 580%

Jackup to have an immediate re-start.

Semisub 14 11 3 78%

The project had planned for 30-40MW power. “After start-

Tenders

N/A N/AN/A N/A up we realized we would be able to produce up to 65MW giving

Total 47 35 12 74% us future capacity,” Adland says. “The biggest risk is if we have

Source: In? eldRigs failure on the power cable. That could give a relatively long shut 15January 2015 down.”

This data focuses on the marketed rig ? eet and excludes assets that are under construction, retired, destroyed, deemed non-competitive or cold stacked.

oedigital.com oedigital.com February 2015 | OE 25 023_OE0215_Analysis_v2.indd 25 1/20/15 5:48 PM