Wikipedia

Corrib gas project

TheCorrib gas project(Irish:Tionscanamh Ghás Aiceanta na Coiribe) is a developednatural gasdeposit located in the Atlantic Ocean, approximately 83 kilometres (52 mi) off the northwest coast ofCounty 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 attractedconsiderable opposition.

Corrib gas field
Location of the Corrib gas field
CountryIreland
RegionSlyne Troughbasin
Locationwest of theMullet Peninsula,County Mayo
Block18/20; 18/25
Offshore/onshoreoffshore
OperatorVermilion Energy
PartnersVermilion Energy (56.5%)
Canada Pension Plan Investment Board(43.5%)
Field history
Discovery1996
Start of development2004
Start of production2015[1]
Production
Estimated gas in place1,000×10^9cu ft (28×10^9m3)
Recoverable gas594×10^9cu ft (16.8×10^9m3)
Producing formationsTriassicSandstones

The Corrib field is Ireland's only domestic source of natural gas production.[2]

History

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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 toEnterprise Oiland its partnersSaga Petroleum Ireland Limited,Statoil Exploration (Ireland) Limited,andMarathon International Petroleum Hibernia Limited.The licence was issued under the licensing terms for offshore oil and gas exploration and development 1992.[3]The Corribnatural gas fieldwas discovered in 1996. It was the first reported commercial natural gas discovery in Ireland since theKinsale Head gas fieldwas discovered in 1971.[4][5]The first appraisal well was drilled in 1997.[6]A number of consents and approvals to develop the Corrib Project were issued in 2001.[7]

In 2002, Enterprise Oil was acquired byRoyal Dutch Shellwho 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.[6]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 aNorsk Hydroand in 2007 a part of Statoil. In July 2009,Vermilion Energyacquired Marathon Oil's stake in the project.[8][9]

Until 2018, Royal Dutch Shell was the operator of the project with a 45% ownership stake.[7][9]In 2018, Shell sold its share of the project to theCanada Pension Plan Investment Board.As part of the transaction, Vermilion Energy became the project's operator and expanded its ownership share to 20%.[10]In 2021, Vermilion acquiredEquinor's 36.5% stake for $434 million (€382 million), becoming the majority owner of the gas field.[11]

Development

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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. The project included development of offshore installations, including the wells and subsea facilities, construction of offshore and onshore pipelines, and construction of onshore processing plant atBellanaboy.[6][12]

Gas field

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The Corrib gas field is located about 83 kilometres (52 mi) offErris HeadinCounty Mayo,in an area known as theSlyne Troughin water depths of 355 metres (1,165 ft).[12]Reserves in the field are believed to be about 1 trillion cubic feet (28×10^9m3), 70% of the volume of the Kinsale field.[6]The gas originates from aTriassicSandstone reservoir 3,000 metres (9,800 ft) below the seabed.[6][12]The natural gas in the Corrib Gas Field is a very pure form of gas, consisting of approximately 97%methaneandethane.[13]The Corrib gas does not containhydrogen sulfideandcarbon dioxidemakes up only 0.3% of the total amount of gas. [14] There are five production wells at the Corrib field, drilled byTransoceanSedco 711semi-submersibledrilling rig. Each well has a "christmas tree" structure above it that contains the control and monitoring equipment. This subsea production system was constructed byVetco,the offshore drilling and production supplier. Flexible individual flowlines will run from each well to a production manifold which will feed the gas into the main pipeline.[14]There is no production platform installed in the field.[6]Production at the gas field is remotely controlled from the Bellanaboy Bridge terminal.

Corrib Gas is expected to run out in 2026 or 2027 as it's production peaked before 2020.[15]

Pipeline

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The pipeline from the Corrib field to the landfall atGlengadis approximately 90 km in length.[12]The pipeline has a diameter of 20 inches (510 mm) and it operates at pressures of 120–345 bars (12,000–34,500 kPa).[14]Work on the offshore section took place in summer 2009 and involved over 7,000 lengths of pipe being welded together on board theSolitairepipelaying vessel.[16][17]The onshore pipeline is 9 kilometres (5.6 mi) in length and runs from landfall to the processing plant.

Processing plant

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Gas is processed at the processing plant 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 is fed to theBord Gáisgas grid.[12]The piping for the onshore processing plant was manufactured by Phoenix Pipes Limited in Slane, County Meath.

Controversy

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Main article:Corrib gas controversy
Gardaíguard the Bellanaboy terminal site from occupation by protesters

Some opponents of the scheme cited concerns about the health, safety and environmental impact of the onshore aspects of the project. Others were concerned with alleged irregularities and precedents surrounding the project. Many groups, most notably theRossport FiveandShell to Seacampaigns, opposed the current plans for the project, which they regarded as dangerous despite assurances from Shell. [18][19]A contrary position is taken by the groupPro Gas Mayo.[20]

A film about the project,The Pipe,was released on 8 July 2010 at the Galway Film Festival.[21]

Safety and environmental concerns

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Pipeline route

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The upstream high pressure gas pipeline connecting the wells to the inland processing site runs through the area ofRossport,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".[22]

Discharges from drying process

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Broadhaven Bayis the proposed area to discharge waste from the refining process[23]

Planning problems

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Planning permission was initially refused by the board ofAn 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".[24]

Tax

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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.[25]Until 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%.[26][27] The new licensing terms called for changes to the tax imposed based upon fields' profit ratios (equal to therate of profitless 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.[26]

Employment

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The construction of the pipeline and plant was expected by Shell's economic consultants, Goodbody Economic Consultants, to create 800 temporary jobs[28]and boost the local Mayo economy by approximately €181 million. The plant was expected by Shell to employ approximately 55 workers when operational.[29]

References

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  1. ^Murtagh, Peter (30 December 2015)."Natural gas begins flowing from controversial Corrib field".The Irish Times.Retrieved1 January2020.
  2. ^"Ireland | Vermilion Energy".vermilionenergy.
  3. ^ "Written Answers – Offshore Exploration".509.Dáil Éireann. 20 October 1999. Archived fromthe originalon 7 June 2011.Retrieved12 November2009.{{cite journal}}:Cite journal requires|journal=(help)
  4. ^ "Ireland Offshore Potential".Irish Offshore Operators Association. Archived fromthe originalon 7 April 2014.Retrieved3 April2014.
  5. ^ "Irish Natural Gas Market".Archived fromthe originalon 19 January 2012.Retrieved3 April2014.
  6. ^abcdef"Corrib".SubseaIQ.Bishop Interactive. Archived fromthe originalon 16 July 2011.Retrieved9 August2010.
  7. ^ab"Corrib Gas Field Development".Department of Communications, Energy and Natural Resources. Archived fromthe originalon 24 October 2010.Retrieved8 August2010.
  8. ^The Earthtimes."Vermilion Energy Trust Closes Agreement to Acquire Working Interest in Corrib Field in Ireland".Earthtimes.org. Archived fromthe originalon 29 July 2012.Retrieved12 November2009.
  9. ^ab"Irish Minister Marks Vermilion's Entry into Corrib Gas Devt".Rigzone.Retrieved12 November2009.
  10. ^Falconer, Kirk (3 December 2018)."Shell Completes $1.3 bln sale of Corrib gas field stake to CPPIB".PE Hub.Retrieved1 January2019.
  11. ^"Equinor Exits Ireland with $434M Sale of Corrib Gas Field Stake to Vermilion Energy".Offshore Engineering. 29 November 2021.Retrieved1 December2021.
  12. ^abcde "Shell Corrib Gas Field".Hydrocarbons Technology.Net Resources International.Retrieved9 August2010.
  13. ^"Gas Content".Archived fromthe originalon 1 April 2016.Retrieved5 August2009.
  14. ^abc. "ONSHORE PIPELINE QUANTIFIED RISK ASSESSMENT"(PDF).Allseas Engineering BV.Department of Communications, Energy and Natural Resources. Archived fromthe original(PDF)on 13 October 2013.Retrieved4 April2014.
  15. ^"Europa says its prospective gas field located off Mayo coast could be as big as Corrib".Irish Independent.3 October 2023.
  16. ^ Burns, John (7 June 2009)."Briefing: Corrib pipeline".The Times.Retrieved9 August2010.[dead link‍]
  17. ^ "Key Milestones of the Corrib gas project".Shell E&P Ireland Ltd.Retrieved9 August2010.[permanent dead link‍]
  18. ^"Pipe Down".
  19. ^[1][dead link‍]
  20. ^"The Mayo News – Shell quarries vandalised".Mayonews.ie. 13 November 2007.Retrieved12 November2009.
  21. ^The Pipethepipethefilm
  22. ^[2]Archived20 November 2007 at theWayback Machine
  23. ^"Marine Times News".Marinetimes.ie. Archived fromthe originalon 20 December 2007.Retrieved24 October2008.
  24. ^"Shell is ordered to re-route 'risky' Corrib gas pipeline".Irish Independent.4 November 2009.Retrieved4 November2009.
  25. ^"Closing of the Sale of Marathon's Corrib Gas Field Shareholding".Department of Communications, Energy and Natural Resources. 6 August 2009. Archived fromthe originalon 20 July 2011.Retrieved23 September2010.
  26. ^ab 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 fromthe originalon 20 July 2011.Retrieved4 February2010.
  27. ^"Shell in Ireland".Shell. Archived fromthe originalon 5 September 2009.Retrieved12 November2009.
  28. ^"Shell in Ireland".Shell. Archived fromthe originalon 8 October 2009.Retrieved12 November2009.
  29. ^"Shell in Ireland".Shell.Retrieved12 November2009.[permanent dead link‍]

Further reading

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