Troll B, a floating process and accommodation platform with concrete hull.
The thin oil layer is between 22 and 26 meters in the Troll West oil province and 11 and 13 meters in the Troll West gas province.
In order to recover oil from the thin layer, it has been necessary to develop advanced drilling and production technology.
(Source: www.statoil.com. Photo: Øyvind Hagen / Statoil ASA)