RIASSUNTO
Abstract
The Frigg Cessation Project was the largest decommissioning project undertaken in the past decade and included the removal of six topsides, three steel jackets and sealines with an estimated weight of 87.000 metric tonnes. The magnitude of the project and the fact that the field straddles the border between Norway and UK makes it unique. Both British and Norwegian statutes apply on Frigg, depending on the location of the platforms. It had been therefore necessary to find an agreement with the relevant authorities of both countries so that the decommissioning of the Frigg field can be handled as a single unit observing both sets of national statutes.
This paper presents a brief description of the Frigg field with its installations to be decommissioned and disposed of, the process and schedule followed by TOTAL to define the decommissioning scope including public consultation of the stakeholders and preparation of the cessation plans for submission to the regulatory bodies. It will also describe the contracting process followed for the award of the main contracts. Furthermore the paper will describe the main execution phases from the offshore hook down, the removal and transportation to the onshore disposal of the installations and will conclude with some lessons learned from this project.