Vesslefrikk Field Development was based on a Semi Sub Floater Production

anchored nearby a Drilling Platform. The pictures show the core production

Process Units on the Semisub and the adjacent Drilling on the Drilling

Platform. For various reasons there was minimumum modularisation of units,

most were constructed piece small, stick. The main reason for this was that

the manufacture and assembly was undertaken in a reasonably developed

concentrated area. Other projects would have seen the process module

modularise to be placed on the Semi Subs deck and the Drilling Platform as

one piece (module) for manufacture and installation. Once the Drilling

Platform/Module is placed on its jacket a Programme of field drilling can go

on independant of the Process Platform. Drilling is undertaken through a

template and out reach wells can be Dirsctionally Drilled to exploit the Fields

Reserves. The Figure explains how these areas are explored from one

central position. Another alternative is inclined drilling to explore outreach

areas. Lastly wells can be explored from outer locations and via a subsea

manifold piped back to a jacket such as Veslefrikk to be brought to the

surface. Drilling Modules or Platforms, although broadly described as

Modules are also usually discrete ie designed for a specific mode of

operation, depth of water, product flows, gathering a series of risers,

collectiong incoming sub sea pipelines etc

The outline of the Vesslefrikk Concept is shown. The Drilling Jacket is the connection to the resrvoirs, Drilling could commence before the

arrival of the Semi Sub. So too could the Hook Up of the Infield Connection to the SALM used as the Export Terminal. The Drilling Topsides

were installed on the Jacket as a one piece Module less the Drilling Derrick installed afterwards. The Semi Sub was an existing Hull towed to

the conversion yard. Whilst at the Conversion Yard the Onboard Equipment was installed as Packages with interconnection Hook Up. Once

converted the Semi Sub was moved to the Vesslefrikk Field where it was moored alongside the Drilling Jacket. The interconnecting Hoses

were then Hooked Up.