FEED Study Oranje Nassau Energy (ONE)

Challenge

Developing marginal oil- and gas fields requires cost- and schedule efficiencies by employing lean engineering techniques and streamlining the design, development, procurement, transport and installation process for platforms. In this respect, Minimum Facilities Platforms have become popular, as they limit the usual large capital expenditure and feature flexible design solutions for a range of applications and water depths.

As the largest privately owned Dutch exploration and production company, Oranje-Nassau Energy (ONE) selects niche opportunities as a cost-efficient operator with a historical focus on the North Sea. GeoSea subsidiary EverSea was contracted by ONE to jointly develop a jacket foundation structure for the exploitation of marginal offshore oil- and gas assets. Since the well lifetime of marginal oil- and gas fields varies from a couple of years to 7-odd years, the client insisted on a smart solution for re-use of the platform.

Our solution

EverSea NV focuses on the technical challenges involved in the development of a Minimum Facilities Platform by acting as an EPCI Contractor towards clients. The GeoSea subsidiary carried out the ‘Front End Engineering Design’ (FEED) study for the common development of a flexible low-cost jacket foundation. The study included both the design of an unmanned gas production platform, powered by wind and solar energy, as well as the engineering of the platform dismantling. The Minimum Facilities gas production platform was scheduled to be installed at the end of 2014 or the beginning of 2015.

The design objectives for this FEED study consisted of a jacket foundation allowed to be placed anywhere in the Dutch Continental Shelf, covering a typical water depth range of 20 m to 50 m LAT. The design lifetime of the jacket foundation was to be 21 years. The design has taken into account the possibility to reuse the jacket foundation up to two times at different locations. It consists of a standard upper frame module plus an additional lower module, the base-frame, if required for deeper water depths. The concept of the modules enables the transport, installation and recovery by a jack-up vessel with a crane capacity of 600 metric tonnes at 25 meters.

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