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Audit of drilling systems on Stena Dee

During the period 20-22 April 2004, the Petroleum Safety Authority Norway (PSA) conducted an audit of the drilling systems on the mobile drilling rig Stena Dee, while the rig was at the Verolme yard in Rotterdam.


Background for the audit

The activity was part of the PSA's consideration of the (AoC) application submitted for the Stena Dee.

Purpose of the audit

The purpose of the activity was to verify that selected technical aspects related to the drilling areas and systems on the Stena Dee were in compliance with the provisions of the regulations.

The activity also provides a basis on which to assess whether Stena Drilling has been successful in the verification work carried out to measure the rig against the regulatory requirements.

Result of the audit

It is the PSA's conclusion that there are obvious deficiencies in the measurements of compliance as regards drilling systems in connection with Stena Drilling's AoC application for the Stena Dée.

Non-conformances in relation to the regulatory requirements were identified during the audit activity.

These non-conformances vary from direct deviations from the HSE regulations to non-conformances due to the fact that the rig does not meet the safety level described in international and Norwegian standards that are referred to in the guidelines to the regulations.

The non-conformances relate to general maintenance, technical conditions in the moon pool area, well control systems, storage of explosives and the drilling fluid unit.

Several of the systems that did not fulfill the regulatory requirements were to be modified or were undergoing modifications. The PSA did not find it expedient to carry out verifications of these systems as we assume that Stena Drilling has performed the necessary measurements of compliance for the new equipment.

This mainly applies to the following systems:

  • Cementing unit
  • Mud mixing unit
  • Driller's cabin
  • Pipe-handling equipment
  • Emergency system for blowout preventer control

The PSA would emphasize the positive impression that several of the planned and implemented modifications will contribute to raising the HSE standard on the rig.

Contact person in the PSA:
Mike Theiss