Abstract

The Frigg Field is a natural gas reservoir, with associated condensate, which extends across the median line between the Norwegian and the United Kingdom (UK) sectors of the North Sea Continental Shelf.

Production from the field is expected to cease during 2004.

The field consist of six platforms standing in approximately 100m of water:

  • Two steel jackets and one concrete gravity platform are located in the Norwegian sector

  • One steel jacket and two concrete gravity platforms are located in the UK sector In addition, a number of infield pipelines and cables run on the seabed between the platforms. Small amounts of drill cuttings are located either within or around the two drilling platforms.

The Frigg Field owners submitted in November 2001 a Frigg Field Cessation Plan[1] to both the Norwegian and UK authorities. A public consultation of the Cessation Plan is required in both countries before any decisions are made.

This paper describes the assessment process followed in establishing the recommended disposal arrangements for the various Frigg Field facilities. It includes details of the environmental impact assessment studies undertaken, the possible reuse options considered and the evaluation of the risks attached to attempting to remove the huge concrete structures which were not specifically designed for removal. In addition, the implication of the structures being located in the maritime areas of two sovereign states, each having their own regulatory regime, is described. Lastly, a description is provided of the extensive process of consultation and dialogue with both governmental and non-governmental organisations that took place before finalising the Frigg Field Cessation Plan.

One of the main results from the extensive programme of studies has been that there is considerable risk attached to attempting to remove the concrete structures. Particular attention has been given to keeping the various stakeholders informed about the progress of the studies and discussing with them the results, as they become available. Possible reuse options for the concrete structures were actively considered, and discussed with stakeholders, including an assessment of options adopted in previous removal projects.

Introduction

The Frigg Field is a natural gas reservoir, with associated condensate, that extends across the median line between the Norwegian and UK sectors of the North Sea Continental Shelf.

Accordingly, the Frigg Field was developed in accordance with the provisions of an agreement between the governments of Norway and the United Kingdom.

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FRIGG FIELD DECOMMISSIONING

Production from the Frigg Field, which is operated from Stavanger Norway, started in September 1977. The cease of production is expected to take place some time in 2003/2004, depending upon reservoi

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