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Shore approach and landfall works, Libyan gas transmission system

West Libya aimed to enhance its position in the supply of continental Europe's energy needs. As the demand for cleaner energy was rising and gas consumption in Italy wasexpected to increase, Libya and Italy found common ground for cooperation. Construction of a 700 million USD gas treatment plant in Mellitah was the centrepiece of this West Libya gas project. The Mellitah plant is supplied with gas from the desert Wafa field, 520 kilometers south-west of Tripoli, and from the offshore Bahr Essalam field, 110 kilometers north of Tripoli.

The Libyan Gas Transmission Project, also called the Green Stream project, comprised the installation of a 32" gas pipeline across the Mediterranean Sea, approximately 516 kilometers long, from Mellitah landfall to Gela landfall at Sicily, Italy. The client was Green Stream, a joint venture between Agip Gas and the Libyan National Oil Company; the main contractor was Saipem S.p.A., who were also contracted for the installation of the offshore twin pipeline from Bahr Essalam gas field to the Mellitah plant. Boskalis Offshore B.V., in joint venture with Tideway B.V., executed the shore approach and landfall works. These included trench excavation (onshore and offshore), installation of pull arrangements, assistance during pipe pull and backfill (rock and sand) of the trenches.

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Deepening of the Eems-pipeline

The 42" Eems pipeline is part of the pipeline connection between the gas cleaning and drying plant of Phillips Petroleum at Rysumer Nacken in Germany, and the natural gas pipeline network in the Netherlands. The gas is obtained from the Ekofisk gas field in the Norwegian region of the North Sea. The pipeline crosses the morphologically dynamic Eems estuary over a length of 4 km, passing both the deep shipping lane ‘Oostfriesche Gaatje’ and the shallow sand bank ‘Paap’.

Development gas export pipeline,
Hibiscus to Point Fortin

The NCMA Development Project comprised the development of the North Coast Marine Area, which is located in the Caribbean Sea and Bay of Paria, Trinidad. The project included the installation of a 24" Gas Export Pipeline from the Hibiscus Platform to a landfall at Point Fortin. From the landfall the pipeline was routed by directional drilling and by surface laid pipeline, to a termination point in the Atlantic LNG Terminal at Point Fortin. As part of this project Boskalis was awarded the contract for the provision of landfall, directional drilling and onshore pipeline installation and testing of the 24" gas pipeline system.

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Hanze F2a Development Project

Hanze, 200 kilometers offshore Den Helder in block F/2 of the North Sea, is the first operated development in the Dutch sector by Germany's Veba Oil. The oilfield reserved approximate 34 million bbl, plus 40 bcf of associated gas. 

Installation gas pipeline, Takoradi

Late November 1998 Boskalis was awarded a subcontract for the installation of two marine pipelines to supply and discharge cooling seawater for the Takoradi thermal power plant that was under construction for the Volta River Authority, near the village of Aboadze approximately 20 kilometers north-east of Takoradi, Republic of Ghana.

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Re-insulation Gannet 'C' Bundles, North Sea

The Gannet 'C' satellite field, which is located in the North Sea at 112 miles East of Aberdeen in 95-meter water depth, comprises four drill centres, each having one or more producing wells. The drill centres are connected to the local platform Gannet 'A' by four flowline bundles with a total length of 10 kilometers. A glycol-based gel, filling the annulus of the Gannet 'C' carrier pipe, insulated the individual flow lines. Prompted by degradation of the gel and the resulting drop in oil and gas arrival temperatures at the platform, an EPIC project took off for a re-insulation system. The objective of the re-insulation system was that it should provide sufficient insulation to the bundles in order to safeguard production during the total field life of Gannet 'C', being a minimum lifetime of 15 years. Boskalis Offshore was supported by Hydronamic - the in-house engineering department.