[Australia] Enfield

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escveritas
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[Australia] Enfield

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Final investment decision made for development of Australian oil fieldsJun. 27, 2016

Mitsui & Co., Ltd. ("Mitsui") is pleased to announce that it has made final investment decision for commercial development of a group of undeveloped oil fields located offshore Western Australia (Greater Enfield Project) in which Mitsui owns 40% working interest through its 100% subsidiary Mitsui E&P Australia Pty Ltd. (MEPAU) The decision was made jointly with Woodside Energy Limited ("Woodside"), the operator of the oil fields with the remaining 60% working interest. The development will involve about US$1.9 billion (US$800 million net to MEPAU) of investment for drilling of production wells and construction of subsea facilities, aiming to commence production of crude oil by around mid-2019.

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Mitsui acquired its working interests in the Enfield and Vincent oil fields, located about 60km offshore Western Australia, in 2004. Greater Enfield Project includes undeveloped reservoirs that are located within the same area as the Enfield and Vincent oil fields. The development concept is centered on utilizing the existing production facility (the Ngujima-Yin Floating Production Storage and Offloading unit, or "FPSO") at the Vincent oil field, through which it achieves integrated operations and a reduced capital requirement compared to a stand-alone development.

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The proposed Greater Enfield Development, involving a subsea tie-back to the Ngujima-Yin Floating Production Storage Offloading (FPSO) vessel, image courtesy of Woodside.


Greater Enfield's reserves were accumulated through post-acquisition exploration and appraisal activities. The current development concept of using an existing FPSO to reduce capital expenditure while taking advantage of declining drilling and facility costs caused by the falling oil price have improved the cost competitiveness of the project. These factors have led to our view that economic feasibility of Greater Enfield Project can be sustained even under prolonged current market conditions, and therefore to our decision to commercially develop these reserves. It is through Greater Enfield Project that MEPAU's technical expertise gained over the years from development and production of Enfield and Vincent oil fields is expected to supplement MEPAU's production and reserves in a cost competitive manner with due care to safety and the environment.

Currently, Enfield and Vincent crude oils are marketed jointly with Woodside through Mitsui & Co. Energy Trading Singapore Pte. Ltd., Mitsui's 100% subsidiary, and we expect the same for Greater Enfield crude oil as well. There are several undeveloped reservoirs in the same permit as Greater Enfield, which we will continue to work to determine their commercial potential.

Mitsui's upstream energy business aims to achieve high quality low cost reserves by taking advantage of current market conditions and continuing to reinforce our three key strengths, namely reserves, production and cost competitiveness, and to pursue strengthening the competitiveness of our earnings base.

The effects of this decision on Mitsui's profit forecast for the year ending March 2017 is expected to be minor.
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Re: [Australia] Enfield

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Enfield Plug and Abandonment

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Woodside proposes to undertake the following petroleum activities within Permit Area WA-28-L:
  • Permanently plug and abandon 18 wells, including production, water injection and gas injection wells, and remove well infrastructure above mudline (Xmas trees, flowline support bases, wellheads, temporary guide bases, ancillary equipment).
  • Inspection, monitoring, maintenance and repair (IMMR) activities to ensure integrity of well infrastructure until decommissioning activities are completed.
The proposed Petroleum Activities Program is scheduled to occur between the first quarter of 2022 and the fourth quarter of 2024.
  • IMMR activities will be ongoing, as needed.
  • If required, MODU pre-laid mooring and blow-out preventer (BOP) tether installation and removal is expected to take one to 12 days per well.
  • Permanent plugging activities for the 18 wells is expected to take about 20 to 60 days per well.
  • Removal of well infrastructure is expected to take up to 10 days per well.
When ongoing, activities will be 24 hours per day, seven days per week. Timing and duration of these activities is subject to change due to project schedule requirements, MODU/vessel availability, unforeseen circumstances and weather. This EP has risk-assessed P&A activities throughout the year (all seasons) to provide operational flexibility.

The Petroleum Activities Program is located in Commonwealth waters in the Exmouth Sub-basin. It is located approximately 38 km north of the North West Cape of Western Australia about 2 km to the east of the Enfield reservoir. The water depth across WA-28-L varies from 200 m in the east to over 2000 m to the west. Water depth is approximately 400 - 600 m. The Petroleum Activities Program does not overlap with any established or proposed marine protected areas. The closest nearshore sensitive habitats to the Petroleum Activities Program is the Commonwealth boundary of the Ningaloo Reef Australian Marine Park approximately 16 km to the south, the Gascoyne Australian Marine Park approximately 18 km to the west, and the Muiron Islands Marine Management and Conservation Area approximately 31 km to the south-east.

Nganhurra Operations Cessation

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Woodside Energy Ltd (Woodside) operates the Enfield field within Production Licence Area WA-28-L, approximately 38 km north of the North West Cape, Western Australia. In 2018 the Nganhurra floating production, storage and offtake facility (FPSO) was utilised to flush, isolate and preserve the Riser Turret Mooring (RTM) and the subsea infrastructure, before the FPSO was disconnected and removed from the Enfield field.

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The Nganhurra Operations Cessation Environment Plan (EP) (Revision 10) was revised to allow for inspection and maintenance activities on the RTM while it remained on station. The EP was accepted in March 2022. This revision of the EP (Revision 11) proposes to decommission the RTM by removing it from the title area field and transporting it to shore for recycling and reuse opportunities.

The RTM is planned to be removed using a heavy lift vessel (HLV) to lift the structure in one piece onto a barge for transport onshore. The lifting activities will occur either in the title area or in a sheltered water location, approximately 55-75 km east of the title area, approximately 43 km north of the North West Cape. The decision to commence tow from the title area to a sheltered water location or remove and recover from the title area will be based on metocean forecast conditions to ensure safe tow and recovery operations.

The removal activities are planned for between October 2023 and February 2024, with a potential opportunity to complete pre-work in the 2022 – 2023 cyclone season (December 2022 - April 2023) to support the proposed removal. Timing of the activities will be dependent on weather conditions, engineering and vessel availability.
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Re: [Australia] Enfield

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The Ngujima-Yin facility comprises the Ngujima-Yin offshore floating production, storage and offloading (FPSO) vessel and associated subsea infrastructure.

The facility currently produces crude oil from the Vincent area reservoir located in Production Licence WA-28-L. With the addition of the Greater Enfield Project, a 12 well subsea tieback to the Ngujima-Yin FPSO, the facility will also produce from hydrocarbon reserves in WA-59-L, and will include the operation of a licenced pipeline (WA-28-PL) tied back to the FPSO.

The facility’s current operations EP was accepted by the National Offshore Petroleum Safety and Environmental Management Authority (NOPSEMA) in 2014.

Woodside is submitting a revised Environment Plan for the Ngujima-Yin Facility operations in accordance with the Offshore Petroleum and Greenhouse Gas Storage (Environment) Regulations 2009 (Cth) (the regulations). The Environment Plan (EP) is being revised to account for the commissioning and operation of the Greater Enfield Project. In addition this revision also incorporates a five yearly update to the existing EP as required by the regulations.

The Ngujima-Yin FPSO is located within Production Licence WA-28-L in Commonwealth waters, approximately 43 km north of North West Cape, Western Australia. The water depth at the FPSO mooring location is approximately 340 m, with wells located in water depths up to 849 m.
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Re: [Australia] Enfield

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Woodside Energy awards DOF Subsea Enfield XT Retrieval and Offshore Support Services Contract

23 Mar 2022

DOF Subsea Australia is pleased to announce it has been awarded Woodside Energy Limited’s Enfield XT Retrieval and Offshore Support Services.

The campaign execution will involve the recovery of 18 Subsea XTrees, 18 Flowbases and associated spool sections, one wellhead severance and recovery of up to 18 Temporary Guide Bases at the Enfield Field, Australia. The contract includes Project Management, Engineering, Fabrication, and decommissioning Services and is expected to be undertaken in Q3 and Q4 2022, using DOF Subsea’s MPSV Skandi Hercules.

Mons Aase, CEO DOF Subsea AS, said, “This is a substantial contract award. It builds on successful campaigns delivered in the past for our client and grows our decommissioning track-record in the APAC region. We look forward to working with Woodside Energy Limited to deliver a safe and efficient project”.
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Re: [Australia] Enfield

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Heerema awarded decommissioning contract for Woodside’s Nganhurra Riser Turret Mooring (RTM)

Heerema Marine Contractors has been awarded a decommissioning contract by Woodside Energy that includes the integrated engineering, preparation, removal, and transport of the Nganhurra RTM.

Removal activities

The work involves removing the RTM from the Enfield field, located approximately 52 km northwest of Exmouth in Western Australia, by lifting the structure in one piece onto a barge and transporting the structure to Henderson or other suitable Australian port for dismantling and recycling or reuse.

Safe and sustainable decommissioning

Heerema has been decommissioning offshore infrastructure safely for over thirty years. It will draw on this expertise and its track record of complex lifting operations to ensure the RTM's safe and environmentally sound recovery.

Jeroen van Oosten, Heerema’s Chief Commercial Officer: ‘We are proud to be Woodside Energy’s contractor of choice for removing the Nganhurra RTM. This contract represents our first decommissioning project in Australia, and although Heerema has a long history of safely and sustainably removing offshore structures from the North Sea and the Gulf of Mexico, we are very excited to continue our responsible decommissioning operations in Australian waters.’

‘Heerema is looking forward to taking an active role in Australia’s decommissioning ambitions. The removal and subsequent reuse or recycling of offshore infrastructure is an essential final step in the lifecycle of oil and gas infrastructure and aligns with our company values of responsibility, sustainability, and contributing to a circular society.’
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