Corrib gas project

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Corrib gas field
Corrib Gas Field Map.png
Location of the Corrib gas field
RegionSlyne Trough basin
Locationwest of the Mullet Peninsula, County Mayo
Block18/20; 18/25
OperatorVermilion Energy
PartnersVermilion Energy (56.5%)
Canada Pension Plan Investment Board (43.5%)
Field history
Start of development2004
Start of production2015[1]
Estimated gas in place1,000×10^9 cu ft (28×10^9 m3)
Recoverable gas594×10^9 cu ft (16.8×10^9 m3)
Producing formationsTriassic Sandstones

The Corrib gas project (Irish: Tionscanamh Ghás Aiceanta na Coiribe) is a developed natural gas deposit located in the Atlantic Ocean, approximately 83 kilometres (52 mi) off the northwest coast of County Mayo, Ireland. The project includes a natural gas pipeline and an onshore gas processing plant, which commenced gas production in 2015. During its development, the project attracted considerable opposition.


The deepwater exploration licence No. 2/93 covering four blocks in the Slyne Trough was granted on 1 January 1993 for a period of 11 years to Enterprise Oil and its partners Saga Petroleum Ireland Limited, Statoil Exploration (Ireland) Limited, and Marathon International Petroleum Hibernia Limited. The licence was issued under the licensing terms for offshore oil and gas exploration and development 1992.[2] The Corrib natural gas field was discovered in 1996. It was the first reported commercial natural gas discovery in Ireland since the Kinsale Head gas field was discovered in 1971.[3][4] The first appraisal well was drilled in 1997.[5] A number of consents and approvals to develop the Corrib Project were issued in 2001.[6]

In 2002, Enterprise Oil was acquired by Royal Dutch Shell who took over the operatorship of the project. Development of the project began in 2004, but it was delayed in 2005 when locals opposed the project.[5] Shell announced the suspension of the project to facilitate further discussions with opposing parties. For a year, independent safety reviews were conducted to address various safety concerns in relation to the project.

In 1999, Saga Petroleum became a part of a Norsk Hydro and in 2007 a part of Statoil. In July 2009, Vermilion Energy acquired Marathon Oil's stake in the project.[7][8]

Until 2018, Royal Dutch Shell was the operator of the project with a 45% ownership stake.[6][8] In 2018, Shell sold its share of the project to the Canada Pension Plan Investment Board; as part of the transaction, Vermilion Energy became the project's operator and expanded its ownership share to 20%.[9] In 2021, Vermilion acquired Equinor's 36.5% stake for $434 million (€382 million), becoming the majority owner of the gas field.[10]


Map of the Corrib Gas Offshore Pipeline

Royal Dutch Shell proposed to develop the Corrib field as a sub-sea production facility with onshore processing. This method of development is claimed by Shell to be in line with best industry practice for gas fields of this type. The project includes development of offshore operations including the wells and subsea facilities, construction of offshore and onshore pipelines, and construction of onshore processing plant at Bellanaboy.[5][11]

Gas field[edit]

The Corrib gas field is located about 83 kilometres (52 mi) off Erris Head in County Mayo in an area known as the Slyne Trough in water depths of 355 metres (1,165 ft).[11] The gas is originating from Triassic Sandstone reservoir 3,000 metres (9,800 ft) below the seabed.[5][11] Reserves in the field are believed to be about 1 trillion cubic feet (28×10^9 m3), 70% the volume of the Kinsale field.[5] The natural gas in the Corrib Gas Field is a very pure form of gas, consisting of approximately 97% methane and ethane.[12] The Corrib gas does not contain hydrogen sulfide and carbon dioxide makes up only 0.3% of the total amount of gas. [13] The subsea production system was delivered by Vetco, the offshore drilling and production supplier. Production at the gas field is remotely controlled from the Bellanaboy Bridge terminal. There are five production wells at the Corrib field, drilled by Transocean Sedco 711 semi-submersible drilling rig. When in operation, each well is planned to have a so-called "christmas tree" structure above it that contains the control and monitoring equipment. Flexible individual flowlines will run from each well to a production manifold which will feed the gas into the main pipeline.[13] There is no production platform installed in the field.[5]


The pipeline from the Corrib field to the landfall at Glengad is planned to be approximately 90 km in length.[11] The pipeline has a diameter of 20 inches (510 mm) and it will operate at pressures of 120–345 bars (12,000–34,500 kPa).[13] Work on the offshore section occurred in summer 2009 and involved over 7,000 lengths of pipe being welded together on board the Solitaire pipelaying vessel.[14][15] The onshore pipeline is still in the proposal phase but is expected to be some 9 kilometres (5.6 mi) in length and run from landfall to the drying plant.

Processing plant[edit]

Gas will be processed at the processing plant 9 kilometres (5.6 mi) inland near Bellanaboy Bridge. The purpose of the plant is to dry the gas and remove impurities. The plant has a capacity of 10 million standard cubic metres of purified gas per day. Processed gas will be fed to the Bord Gáis gas grid.[11]

The piping for the Onshore Processing Plant is manufactured by Phoenix Pipes Limited in Slane, Co. Meath.


Gardaí guard the Bellanaboy terminal site from occupation by protesters

Some opponents of the scheme cite concerns about the health, safety and environmental impact of the onshore aspects of the project. Others are concerned with alleged irregularities and precedents surrounding the project. Many groups, most notably the Rossport Five and Shell to Sea campaigns, oppose the current plans for the project, which they regard as dangerous despite assurances from Shell. [16][17] A contrary position is taken by the group Pro Gas Mayo.[18]

A film about the project, The Pipe was released on 8 July 2010 at the Galway Film Festival.[19]

Safety and environmental concerns[edit]

Pipeline route[edit]

The upstream high pressure gas pipeline that will connect the wells to the inland processing site is planned to run through the area of Rossport, close to local residences. A report by Dr. Richard Kupriewicz concluded that "the terrain makes escape routes for the clustered population essentially impossible in the event of a [pipeline] rupture".[20]

Discharges from drying process[edit]

Broadhaven Bay is the proposed area to discharge waste from the refining process[21]

Planning problems[edit]

Planning permission was initially refused by the board of An Bord Pleanála (the Irish planning authority). Senior planning inspector Kevin Moore's report stated in part:

It is my submission that the proposed development of a large gas processing terminal at this rural, scenic, and unserviced area on a bogland hill some 8 kilometres inland from the Mayo coastland landfall location, with all its site development works difficulties, public safety concerns, adverse visual, ecological, and traffic impacts, and a range of other significant environmental impacts, defies any rational understanding of the term "sustainability".

In November 2009, An Bord Pleanála ordered Shell to redesign the pipeline and move its route away from homes saying it posed an "unacceptable risk".[22]


Claims of a tax yield of some €1.7 billion over the life of the field have been made by the Irish government based on data about the field's size and 2008 gas prices.[23] Up to 2007, the Irish Petroleum Licensing Terms imposed a flat 25% income tax on gas production revenues. In August 2007, the top rate of tax on the most profitable fields was increased to 40%.[24][25] The new licensing terms called for changes to the tax imposed based upon fields ' profit ratios (equal to the rate of profit less 25% divided by the accumulated level of capital investment). Where this ratio is greater than 4.5, an additional 15% tax was imposed, where it is between 3.0 and 4.5 an additional 10% was imposed and where the profit ratio is between 1.5 and 3.0, and additional 5% tax was added. Less profitable fields were not affected.[24]


The construction of the pipeline and plant was expected by Shell's economic consultants, Goodbody Economic Consultants, to create 800 temporary jobs [26] and boost the local Mayo economy by approximately €181 million. The plant was expected by Shell to employ approximately 55 workers when operational.[27]


  1. ^ Murtagh, Peter (30 December 2015). "Natural gas begins flowing from controversial Corrib field". The Irish Times. Retrieved 1 January 2020.
  2. ^ "Written Answers – Offshore Exploration". 509. Dáil Éireann. 20 October 1999. Archived from the original on 7 June 2011. Retrieved 12 November 2009. {{cite journal}}: Cite journal requires |journal= (help)
  3. ^ "Ireland Offshore Potential". Irish Offshore Operators Association. Archived from the original on 7 April 2014. Retrieved 3 April 2014.
  4. ^ "Irish Natural Gas Market". Archived from the original on 19 January 2012. Retrieved 3 April 2014.
  5. ^ a b c d e f "Corrib". SubseaIQ. Bishop Interactive. Archived from the original on 16 July 2011. Retrieved 9 August 2010.
  6. ^ a b "Corrib Gas Field Development". Department of Communications, Energy and Natural Resources. Archived from the original on 24 October 2010. Retrieved 8 August 2010.
  7. ^ The Earthtimes. "Vermilion Energy Trust Closes Agreement to Acquire Working Interest in Corrib Field in Ireland". Archived from the original on 29 July 2012. Retrieved 12 November 2009.
  8. ^ a b "Irish Minister Marks Vermilion's Entry into Corrib Gas Devt". Rigzone. Retrieved 12 November 2009.
  9. ^ Falconer, Kirk (3 December 2018). "Shell Completes $1.3 bln sale of Corrib gas field stake to CPPIB". PE Hub. Retrieved 1 January 2019.
  10. ^ "Equinor Exits Ireland with $434M Sale of Corrib Gas Field Stake to Vermilion Energy". Offshore Engineering. 29 November 2021. Retrieved 1 December 2021.
  11. ^ a b c d e "Shell Corrib Gas Field". Hydrocarbons Technology. Net Resources International. Retrieved 9 August 2010.
  12. ^ "Gas Content". Archived from the original on 1 April 2016. Retrieved 5 August 2009.
  13. ^ a b c "ONSHORE PIPELINE QUANTIFIED RISK ASSESSMENT" (PDF). Allseas Engineering BV. Department of Communications, Energy and Natural Resources. Archived from the original (PDF) on 13 October 2013. Retrieved 4 April 2014.
  14. ^ Burns, John (7 June 2009). "Briefing: Corrib pipeline". The Times. Retrieved 9 August 2010.
  15. ^ "Key Milestones of the Corrib gas project". Shell E&P Ireland Ltd. Retrieved 9 August 2010.[permanent dead link]
  16. ^ "Pipe Down".
  17. ^ [1][dead link]
  18. ^ "The Mayo News - Shell quarries vandalised". 13 November 2007. Retrieved 12 November 2009.
  19. ^ The Pipe
  20. ^ [2] Archived 20 November 2007 at the Wayback Machine
  21. ^ "Marine Times News". Archived from the original on 20 December 2007. Retrieved 24 October 2008.
  22. ^ "Shell is ordered to re-route 'risky' Corrib gas pipeline". Irish Independent. 4 November 2009. Retrieved 4 November 2009.
  23. ^ "Closing of the Sale of Marathon's Corrib Gas Field Shareholding". Department of Communications, Energy and Natural Resources. 6 August 2009. Archived from the original on 20 July 2011. Retrieved 23 September 2010.
  24. ^ a b Ryan, Eamon (1 August 2007). "Government announces new round of licensing for oil and gas exploration under new licensing terms". Press Release. Department of Communications, Energy and Natural Resources. Archived from the original on 20 July 2011. Retrieved 4 February 2010.
  25. ^ "Shell in Ireland". Archived from the original on 5 September 2009. Retrieved 12 November 2009.
  26. ^ "Shell in Ireland". Archived from the original on 8 October 2009. Retrieved 12 November 2009.
  27. ^ "Shell in Ireland". Retrieved 12 November 2009.[permanent dead link]

Further reading[edit]

External links[edit]