Photograph by KrisScottHall - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=53499965
Although the oil and gas industry is still going through tough times, one area that continues to provide a steady stream of work is in the decommissioning sector. Thanks to EIC DataStream, we are able to bring you a list of oil and gas decommissioning projects awarded so far in 2017.
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Brent platform decommissioning preparation
This work will cover the removal of topsides of three of four Brent platforms, Alpha, Bravo and Delta, as well as the steel jacket of Alpha. The decommissioning programme will start with the 23,500-tonne Brent Delta topside. A second decommissioning programme for the remaining infrastructure in the Brent field, including Brent Delta’s legs, three other sets of topsides and legs, 140 wells and 28 pipelines, will be submitted at a later date. All three (eventually four) platform topsides will be removed by single lift vessel and taken onshore for dismantling and disposal with the target of greater than 95% recycling of materials.
Miller Field: Recycling
Plans are to plug and abandon the 22 wells, remove the topsides modules and return them to shore for re-use, recycling or disposal. The jacket footings will be left in place, as will the drilling template and export pipelines, which have been flushed and may be re-used for future projects. However, spool pieces will be removed, as will the umbilicals. The topside modules to be removed include the following units: helideck; power generation; process (gas compression); accommodation; process (separation); drilling/wellbay; substructure and skidbase; derrick; cellar deck; flare tower; exhaust tower and wireline logging unit. The 16,927 tonne jacket will also be removed. Concrete mattresses will be taken away, while the cuttings pile will be left to be absorbed by the seabed.
Chinguetti Field: Well intervention vessel
The Chinguetti field was developed by an FPSO in 2006. Production is expected to stop by the end of 2016, and the decommissioning plan for the FPSO will be submitted to the government in Q2 2016.
Sable Gas Field
Decommissioning of the Sable Offshore Energy project. The offshore natural gas project has been in decline since the late 2000s. The work can begin on wells no longer in production while other wells continue to produce. The project requires a harsh environment jack-up drilling rig for the plugging and abandonment of 22 wells across seven wellhead platforms. Activities will be executed primarily with wireline and coiled tubing using minimal rig equipment. It also includes engineering, preparatory work, offshore removals, transportation, demolition, and disposal for all offshore topsides, jackets and potentially subsea facilities. A facility will be required to dismantle, recycle and dispose of materials from the project; it could be local but international companies along the Atlantic coast are being considered as well. In total, offshore decommissioning work would cover 400km of pipeline and 50,000 tonnes of decks, jackets and piles. Three contracts awarded as part of this project are listed below:
Well plug and abandonment
ERPD of platforms
Plug and abandonment equipment, services and personnel
Valhall Oil Field: Decommissioning
The Valhall oil field entered production in 1982 and is located 70 metres of water. The field consists of six separate steel platforms for quarters, drilling, wellheads, production, water injection, combined process-and hotel platform respectively. These platforms are bridge-connected. The field also has two unmanned flank platforms. The field has 45 production wells. Valhall is also the owner of the 2/4 G-platform installed in 1982, located at Ekofisk and operated by Conoco Phillips. The platform was taken out of service as part of Ekofisk II in 1998. Both the removal and impact assessment plan was approved by the Ministry of Petroleum and Energy in December 2015. Decommissioning work at Valhall will cover mostly the first generation platforms, which have been in operation since the early 1980s.
Anchor Handling and TUG Supply
D30 and Dana shallow-water oil and gas fields are located in water depths of between 10-80 metres in Block SK305 off Sarawak, Malaysia. The field utilises two Mobile Offshore Production Units, MOPU SATU in D30 and MOPU DUA in Dana field - supplied on a lease basis by a joint venture comprising MISC and Global Process Systems under an original contract period of 10 years. Another surface facility at the Dana field is a small platform called a “light weight structure” - was provided by 2H Offshore, with combined weight of the small platform, comprising jacket, topsides and boat landing, is about 300 tonnes. The platform was designed to be easily decommissioned. It is understood production started from D30 and Dana in 2009.
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