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ENI – Goliat FPSO – North Sea

The Goliat field is located in the production licence 229, in the Barents Sea, north of Russia and Norway. It was originally awarded in the Barents Sea in 1997, which was initiated in order to increase interest in the area as an oil and gas region.

The discovery well was drilled in 2000 and a total of five wells have so far been drilled. The licensees of PL229 are owned by Eni Norge (operator) with 65% and Statoil with 35%.

Goliat has two separate main reservoirs – the Kobbe and Realgrunnen – and contains oil with an overlying gas cap.

The Realgrunnen reservoir is situated 1,000m below sea level and the Kobbe reservoir 1,800m below sea level. There are also minor oil discoveries in the Snadd and Klappmyss formations.

The reservoirs are characterised by low pressures – 123bar from Realgrunnen and 192bar for Kobbe. This presents potential challenges for production flow.

Production from the field started in 2013. Gas from the field injected into the Kobbe reservoir or transported to Melkoya.

The maximum volume of gas production and reinjection will be 1.3 billion cubic metres a year and will occur a year after production commences.

The field to be in production for up to 15 years, but field life may extend with new discoveries.

FPSO

Eni had two potential development strategies and has signed letters of intent with Sevan marine and Aker Engineering and Technology for preliminary work for a Goliat FPSO, after which Eni evaluated the proposed solutions. The recommendation was based on several criteria, including the environment, for example, the lowest energy consumption and possible electrification from shore.

The Goliat platform will be equipped with a gas turbine with heat recovery and recycling to provide the necessary process heat. The electric cable from shore will be dimensioned to allow for an increase in energy supply.

There must be a low risk of impact in the event of accidental spills and economics (there has to be high recovery and efficient reservoir drainage). The technological solutions have to be designed with a view to cold icing and darkness.

Preliminary front-end engineering design work has begun on the production templates and the flowlines / risers / installation. The development proposal was put to the Norwegian Parliament and approved in May 2009.

The approved development plan includes subsea wells tied to an FPSO. After a thorough evaluation, the Sevan 1000 concept was chosen. Production is expected to be 100,000bopd, including gas.

As per the contract, Sevan Marine will provide project and engineering management and preliminary service for developing the FPSO for the project.

In January 2010, the company signed another letter of intent with Esvagt for ensuring the safe delivery and standby of a vessel to be used for operation during the project.

The vessel will be based on advanced technology to respond immediately in case of oil spill over the project. In February 2010, Eni awarded the EPC contract for the Goliat FPSO to Hyundai Heavy Industries. The contract is worth $1.16bn and includes onshore commissioning and transportation of the FPSO to the field.

In November 2011, the Offshore Division of Lankhorst Ropes was contracted to supply mooring lines for the Goliat FPSO by early 2013.

The FPSO will receive power from a new shoreside power supply system at Hyggevatn in Hammerfest, Norway. The power supply system will comprise a substation at Hyggevatn, overhead transmission lines, a buried cable and an advanced reactive-power compensation system.

The new system is expected to come online in 2012. Powering the FPSO from land will reduce carbon dioxide emissions by half, compared with onboard gas turbines and generators.

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