concepts were evaluated
As a partner in the Johan Sverdrup field development licence, Lundin Norway As was looking for alternative concept solutions prior to the concept freeze.
The main premises were already in place. However, with well documented improvements, there were possibilities to get changes included in the concept.
The initial concept included four platforms for the first phase: power hub, living quarter, process and utility platform and wellhead platform.
Norconsult evaluated different concepts for the process and utility platform, the wellhead platform and a «new» platform defined during the study phase - for risers and export.
We looked into different solutions for the process and utility platform with varying capacities, distribution of equipment, and with and without well bay area.
In addition separate wellhead platform concepts have been explored, and various solutions for riser and export platforms have been developed.
All together seven different concepts have been evaluated.
The work included process and layout development, master equipment list development, structural and electrical evaluations, estimation and scheduling.
Norconsult has used NorWest Methodology to develop weight and man hour estimates, leading to a project schedule, for the various concepts.
Norwest Methodology was used in the execution of the studies. Process, mechanical, layout and estimation disciplines were central in the study performance.
NorWest Methodology is developed by Norconsult and is an estimation tool including a database containing as-built information from offshore installations.
By developing sound and good process and mechanical input (MEL), together with a facility layout, NorWest Methodology is used for estimation of the topside's as-built weight and cost. Man hour estimates is also used as input to project development scheduling.
The figure below shows a simplified flow diagram of NorWest Methodology.
During a period of nine months, we performed seven feasibility studies for the Johan Sverdrup process and utility platform, wellhead platform and riser and export platform looking into different topside solutions.
The result of the studies gave valuable input to the concept selection, and the final concept included a living quarter, process and utility platform, drilling platform and the riser and export platform that was initiated during the studies done by Norconsult.