Minimum facility platforms
The philosophy behind Ramboll’s minimum-facility platform is to use simple and robust technology which requires a minimum of manual operation and maintenance. Key characteristics are:
By keeping the minimum-facility platform unmanned, we are reducing the risk to personnel while reducing costs. Robust equipment means fewer maintenance campaigns. This will keep OPEX down and also allow for alternative modes of access. Access via boat or telescopic gangway eliminates both costs and risks associated with helicopter access.
All process facilities that are not required for transfer of well stream to the pipeline are eliminated. We call it the scaled-down topsides, characterised by:
Applying advanced design and calculation tools, Ramboll is able to optimise the structural design and reduce steel volume while still adhering to all safety and regulatory requirements.
The result is a robust, low-weight, and easy-to-fabricate structure, which is easily installed at different water depths.
Ramboll has assisted DONG Energy with a development project for modification of the Siri field in the North Sea, where we designed two lightweight and robust minimum-facility platforms, Nini and Cecilie.The two unmanned wellhead platforms operate as satellites tied back to the mother platform, Siri, via three inter-field pipelines. The water depth is approximately 60 metres.
The unmanned wellhead platform is a development concept under consideration for several licenses on the Norwegian continental shelf. Ramboll carried out a study for The Norwegian Petroleum Directorate pointing out pros and cons of the concept.
Statoil awarded Ramboll a feasibility study for their Johan Sverdrup field development project with the purpose of developing feasible concepts for minimum-facility platforms.
BHP Billiton were extending their activities in the Gulf of Mexico, West Cameron area, a with an unmanned wellhead platform. Ramboll was awarded the design of this minimum-facility platform.
Unmanned minimum-facility platforms are a cost-effective alternative to subsea production systems. Statoil contracted Ramboll to carry out a study on an unmanned wellhead platform (UWP) for their Oseberg field.
As part of the Tyra field development in the Danish North Sea, operator, Maersk Oil, contracted Ramboll to assist with a number of engineering services for the design of the Tyra South East A platform. Tyra South East A came on stream in 2002.