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Audit of safeguarding of well integrity on Gyda, Valhall and Jotun

As part of the Norwegian Petroleum Authority Norway's (PSA's) pilot survey of the safeguarding of well integrity on the Norwegian Shelf, we audited Talisman Energy Norge AS (Talisman), BP Norge AS (BP) and ExxonMobil Exploration and Production Norway AS (ExxonMobil). Following the audit, we believe the companies should focus further on improvement in relation to well integrity as regards the organisations, systems and equipment on their facilities.


Background for the audit

It is the PSA's general impression that the industry needs to strengthen its efforts to improve well safety in the activities on the Norwegian continental shelf. This is why the PSA is conducting a survey of how the industry safeguards well integrity to avoid major accidents.

Initially, this entails a pilot survey with random sample audits (seven companies, including 12 facilities and 581 production wells) to find out more about the extent of problems and challenges, making it possible to direct a later full survey against selected and recurring challenges in the industry.

The selected companies have answered central questions and handed in data regarding their safeguarding of well integrity, which has then been the subject of further study through audits in the form of clarification meetings with the companies in May 2006.

Valhall DP and Gyda

Valhall DP and Gyda

For Talisman, selected wells on Gyda are dealt with in this audit, for BP on Valhall DP.

Jotun

Jotun

For ExxonMobil, selected wells on Jotun are dealt with.

Purpose of the audit

  • Get a correct and uniform understanding of the companies' submitted answer/documentation regarding their safeguarding of well integrity.
  • If relevant, calibrate/adjust the basic input information in the analysis.
  • Convey the PSA's immediate impression of the received documentation.
  • Identify possible outstanding issues with the companies in order to complete the pilot survey/audit.

In this manner, we want to establish as good a basis as possible for carrying out the next phase of the work to improve the safeguarding of well integrity on the Norwegian Shelf.

Result of the audit

The audit confirms that the companies have recently implemented plans for increasing the effort to safeguard well safety. However, there are still outstanding challenges to maintain well integrity in an adequate manner.

Talisman

The audit at Talisman identified issues which indicate a need for further focus on and improvements related to well integrity for the organisations, systems and equipment on Gyda.

The improvement issues are related to the following areas:

  • Clarification of format and content of hand-over documentation for wells in the company.

  • Inspecting the condition of barrier elements and downhole equipment.

  • Training of relevant personnel in well barriers.

  • Use of terms and abbreviations in documents.

  • Active use of experience transfer.

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In the meeting on 23 May 2006, the PSA checked possible confusions in connection with the documentation received from Talisman in the pilot survey. The basic information in this mapping has been calibrated and adjusted to the extent possible.

BP

The audit at BP identified issues which indicate a need for further focus on and improvements related to well integrity for the organisations, systems and equipment on Valhall DP.

The improvement issues are related to the following areas:

  • Accessibility and validity of information regarding well barriers.

  • Clarification of format and content of hand-over documentation for wells in the company.

  • Use of inspections of the condition of barrier elements and downhole equipment.

  • Documentation of well barriers, based on Norsok D010 rev3.

  • Training of relevant personnel in well barriers.

  • Use of terms and abbreviations in documents.

  •  

In the meeting on 23 May 2006, the PSA checked possible confusions in connection with the documentation received from BP in the pilot survey. The basic information in this mapping has been calibrated and adjusted to the extent possible.

Our immediate impression of the situation in BP was explained in the clarification meeting.

ExxonMobil

The audit at ExxonMobil identified issues which indicate a need for further focus on and improvements related to well integrity for the organisations, systems and equipment on Jotun.

The improvement issues are related to the following areas:

  • Preparation of well-specific barrier outlines.

  • Content of "Hand-over" documentation.

  • Use of monitoring and inspection of technical state for barrier elements and well integrity.

  • Need to coordinate the company's internal documentation with Norsok D010 rev 3.

  • Training of personnel, both in Norway and the UK, regarding well barriers.

  •  

In the meeting on 22 May 2006, the PSA checked possible confusions in connection with the documentation received from ExxonMobil in the pilot survey. The basic information in this mapping has been calibrated and adjusted to the extent possible.

Our immediate impression of the situation in ExxonMobil was explained in the clarification meeting.

Joint report

In addition, a joint report from the pilot survey will be prepared, in which common factors and trends from the audit of the seven operating companies in question will be compared and discussed.

Contact in the PSA:
Mike Theiss