Scope of the work, which is due for completion by 2013-end, includes performing high-level process simulations to identify the optimum technical solution for the upgrade, and production of a detailed study report and a total installed cost estimate.

Foster Wheeler said the project is aimed at addressing crude feedstock flexibility needs and increasing production of diesel as well as ultra-low-sulfur diesel.

The upgrade also includes the installation of a new vacuum distillation unit and new diesel hydrotreaters.

Foster Wheeler president and COO Umberto della Sala said, "We will apply our in-depth refining expertise and technology know-how to assist Statoil in developing a viable plan for implementing its refinery upgrade, in line with its objectives."

Statoil asset owner representative and strategy manager Lars Thorstholm said, "This is an important project for Statoil to improve the competitiveness of the Mongstad Refinery."