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Audit of safeguarding of well integrity in Shell, Norsk Hydro, ConocoPhillips and Statoil

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 A/S Norske Shell (Shell), Norsk Hydro Produksjon a.s (Hydro), ConocoPhillips Skandinavia AS (ConocoPhillips) and Statoil ASA (Statoil). 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.

Selected wells are dealt with in this audit on following facilities: Draugen (Shell), Oseberg Øst, Njord and Grane (Hydro), Eldfisk A and Ekofisk X (ConocoPhillips), Veslefrikk, Åsgard A and Statfjord C (Statoil).

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.

    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.
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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.

Shell

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

Source: Shell

Draugen (source: Shell)

The improvement issues are related to the following areas:

  • Accessibility and user-friendliness of well information for old wells.

  • Clarification of format and content in well hand-over documents.

  • Use of preventative maintenance for barrier elements and well integrity.

  • Documentation of well barriers based on Norsok D010 rev3.

  • Performance requirements, expertise and well integrity training.

  • Reliability analyses of failure mechanisms and robustness of barriers.

  • Transfer of experience.

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In the meeting on 19 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.

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

Hydro

The audit at Hydro identified issues which indicate a need for further focus on and improvements related to well integrity for the organisations, systems and equipment on Oseberg Øst, Njord and Grane.

Source: Hydro

Oseberg Øst, Njord og Grane (source: Hydro)

The improvement issues are related to the following areas:

  • Accessibility and quality of well information.

  • Diagnosis procedures and status of leaks.

  • Content in well handover documentation.

  • Preventative maintenance of downhole equipment.

  • Documentation of well barriers based on Norsok D010 rev3.

  • Synergy references for deviation handling of barrier sketches.

  • Performance requirements, expertise and well integrity training.

  • Reliability analyses of failure mechanisms and robustness of barriers.

  • Transfer of experience.

  •  

In the meetings on 18 May 2006, the PSA checked possible confusions in connection with the documentation received from Hydro 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 Hydro was explained in the clarification meeting.

ConocoPhillips

The audit at ConocoPhillips identified issues which indicate a need for further focus on and improvements related to well integrity for the organisations, systems and equipment on Eldfisk A and Ekofisk X.

Source: ConocoPhillips

Eldfisk A og Ekofisk X (source: ConocoPhillips)

The improvement issues are related to the following areas:

  • Validation and accessibility of barrier information for the users.

  • Routines for and format of hand-over documentation.

  • Inspection of barrier elements and downhole equipment.

  • Well barrier training.

  • Reliability analyses for increased understanding of failure mechanisms and improved robustness of barriers.

  • Use of terms and abbreviations in documents.

  •  

In the meeting on 16 May 2006, the PSA checked possible confusions in connection with the documentation received from ConocoPhillips 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 ConocoPhillips was explained in the clarification meeting.

Statoil

The audit at Statoil identified issues which indicate a need for further focus on and improvements related to well integrity for the organisations, systems and equipment on Veslefrikk, Åsgard and Statfjords C w/satellites.

Source: Statoil

Veslefrikk, Åsgard A og Statfjord C (source: Statoil)

The improvement issues are related to the following areas:

  • Accessibility and quality of well information.

  • Format of hand-over documentation for wells.

  • Inspection of barrier elements and downhole equipment.

  • Documentation of well barriers based on Norsok D010 rev3.

  • Knowledge of and active use of internal measures regarding technical condition.

  • Well barrier training for operations personnel.

  • Reliability analyses for increased understanding of failure mechanisms and improved robustness of barriers.

  • Use of terms and abbreviations in documents.

  • Transfer of experience.

  •  

In the meetings on 5 May 2006, the PSA checked possible confusions in connection with the documentation received from Statoil in the pilot survey. The basic information in this mapping has been calibrated and adjusted to the extent possible.

Joint report

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

Link:Audit with Talisman, BP and ExxonMobil

Link:Well integrity challenges on the Norwegian shelf

Contact in the PSA:
Mike Theiss