Page 16: of Offshore Engineer Magazine (Aug/Sep 2016)

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devices and gas lift, with gas-reinjection and water injection for pressure support.

Rig stats

In the latest incarnation of the development, the number of

Worldwide wells needed has been dropped from 40 to 31 and the num-

Rig Type Total Rigs Contracted Available Utilization ber of templates from 15 to 10, plus two satellite, said Tore

Drillship 104 68 36 65%

Karlsen, ? owline manager Johan Castberg project, Statoil,

Jackup 398 251 147 63% at Subsea Valley. This means the number of risers has also

Semisub 127 87 40 68%

FIELD OF VIEW dropped, from 18 to 11. All of which has reduced the length of 31 21 10 67%Tenders pipe and umbilicals required to 116km, cutting materials and

Total 660 427 233 64% installation costs, as well as the number of rig days.

North America

Rig Type Total Rigs Contracted Available Utilization

DC ? ber future

Drillship 30 26 4 86%

A signi? cant new element to Johan Castberg is its electric and 24 6 18 25%

Jackup communications infrastructure – in the form of new direct 14 9 5 64%

Semisub current ? ber optic (DC/FO) cable technology. ASN, now part

N/A N/AN/A N/A

Tenders of Finnish communications giant Nokia, has been working 68 41 27 60%

Total on the technology since forming an agreement with Statoil in

Asia Paci? c 2011-12, which Chevron has also supported. The goal was to

Rig Type Total Rigs Contracted Available Utilization design a solution incorporating high-bandwidth communica- 11 3 8 27%

Drillship tions with reliable electrical power supply into subsea control

Jackup 120 69 51 57% systems, with “near-unlimited distances at any sea depth,”

Semisub 29 15 14 51% says Håkon Frøyshov, principal engineer, subsea cables leader 22 14 8 63%

Tenders

Johan Castberg project, Statoil. The result is an electrical and 182 101 81 55%

Total optical ? ber infrastructure – separate from service umbilicals

Latin America – to connect a production facility with subsea nodes, which

Rig Type Total Rigs Contracted Available Utilization can be placed inside or outside the subsea template, anywhere

Drillship 31 20 11 64% along the cable. The daisy infrastructure can feed 10kW

Jackup 51 33 18 64% downstepping the backbone high voltage to low voltage wet 25 21 4 84%

Semisub mate user interfaces, without any requirement for high voltage 2 2 0 100%

Tenders connectors, and wet mate direct ? ber optic connection from 109 76 33 69%

Total the platform.

Depending on how it is con? gured, each node could serve

Northwest European Continental Shelf

Rig Type Total Rigs Contracted Available Utilization 1-2 templates, or, to put it another way, at each node four

N/A N/AN/A N/A

Drillship electric outputs independent of each other can provide 2.5kW

Jackup 48 38 10 79% power, plus two ? ber optic wet connectors. The nodes, which

Semisub 40 33 7 82% can will be controlled from the FPSO, have also been de-

Tenders

N/A N/AN/A N/A signed to have a standardized interface, to be independent of

Total 88 71 17 80% any subsea supplier. “They have a standard DC 400V interface, can communicate

Middle East & Caspian Sea

Rig Type Total Rigs Contracted Available Utilization with any subsea control module on the market and can have 1 0 1 0%

Drillship optional inverters, to AC 220V, 400V or 500V,” said Ronan

Jackup 111 84 27 75%

Michel, O&G product line manager at ASN, at the Underwater 4 3 1 75%

Semisub

Technology Conference (UTC) in Bergen this June.

N/A N/AN/A N/A

Tenders

The cable, which is in the ? nal stages of quali? cation, is

Total 116 87 29 75% comprised of two electric conductors with ? ber optic in the middle, and can either be powered by the production facility,

Sub-Saharan Africa

Rig Type Total Rigs Contracted Available Utilization or for long-distance step-outs, of up to 350km, with 100kW,

Drillship 21 16 5 76%

Frøyshov says. The system may be equipped with more than 22 11 11 50%

Jackup eight nodes providing that overall system power (100kW) is 6 3 3 50%

Semisub not exceeded.

Tenders 7 5 2 71% “The cable is fully repairable re-using standard telecommu-

Total 56 35 21 62% nications techniques that have been proven in 8000m water depth,” Michel says. “Cable end boxes and Y-splices enable

Eastern Europe future tie-ins.”

Rig Type Total Rigs Contracted Available Utilization

Drillship 1 1 0 100%

As well as extending cable length capabilities (current limi-

Jackup 2 1 1 50% tations are up to about 150km), the beauty of the design is that, 2 1 1 50%

Semisub on Johan Castberg, which would have had some 16 separate

Tenders

N/A N/AN/A N/A cables feeding eight templates, just two DC/FO cables will be 5 3 2 60%

Total needed, looping around the lot, Frøyshov says. “Traditionally, one template, you would have two electric

Source: In? eldRigs 13 July 2016 leads to provide electric power, each providing 1.5kW, for

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

redundancy,” he says. “For Johan Castberg, we have many

August 2016 | OE oedigital.com 18 016_OE0816_field of view.indd 18 7/23/16 11:42 AM