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Audit of major accident risk and barrier management - light well intervention - Island Constructor

In December 2011 and January 2012, the Petroleum Safety Authority Norway (PSA) conducted an audit of Statoil Petroleum AS (Statoil) and Island Offshore Subsea AS (Island Offshore). The audit was aimed at management of major accident risk and the barrier management system in connection with light well intervention on Island Constructor.


Each year, more than 500 well interventions are carried out on the Norwegian shelf, and this number is expected to grow.

There is a high level of risk associated with work on live wells (major accident potential) and many interfaces (multiple alliance partners).

A survey of well intervention activities carried out during the period 2003 - 2008 concluded that there was a significant need for well interventions on subsea installations. Verification on one of the facilities that carries out light well intervention was implemented to investigate HSE challenges linked with this type of operation.

Island Offshore Management and Island Offshore Subsea have an alliance with FMC and Aker Well Service for operation of the Island Constructor which carries out light well intervention on subsea wells for Statoil.

Objective

  • Evaluate the companies’ understanding, knowledge and expertise as relates to major accident risk and managing barriers, on the part of both company management and among the employees.
  • Evaluate strategies and principles which are to form the basis for design, use and maintenance of barriers so that the barriers’ function will be safeguarded throughout the entire facility lifetime.
  • Verify that performance requirements are established and implemented.
  • Develop the PSA’s expertise in following up management’s work to reduce major accident risk, and clarify the need to develop a framework and supervision methods.
  • Contribute to the PSA developing its own methods that will form the basis for more effective barrier supervision.

Result
The audit activity uncovered three nonconformities and four improvement items as regards Island Offshore.

The nonconformities related to deficient analysis of defined hazard and accident situations, layout of kill and stimulation lines, and deficient basis for and documentation of maintenance.