Lincolnshire Offshore Gas Gathering System (LOGGS) | |
---|---|
Country | United Kingdom |
Region | southern North Sea |
Location/blocks | 49/16 |
Offshore/onshore | Offshore |
Coordinates | 53°23’27”N 02°00’13”E |
Operators | Conoco, ConocoPhillips, Chrysaor |
Owner | Conoco, ConocoPhillips, Chrysaor |
Field history | |
Start of production | 1988 |
Abandonment | 2018 |
The Lincolnshire Offshore Gas Gathering System (LOGGS) was a major natural gas collection, processing and transportation complex in the UK sector of the southern North Sea. It comprised five bridge-linked platforms about 118 km east of the Lincolnshire coast, which operated from 1988 to 2018.
The development of the Audrey, North Valliant, South Valiant, Vanguard and Vulcan gas fields [1] across several North Sea Blocks (49/11a, 49/16, 49/21, 49/16, 48/25b respectively) required the provision of a central collection, processing and transportation hub to deliver the combined gas output to the onshore Theddlethorpe gas terminal. The LOGGS complex was built to meet these requirements and with provisions to collect gas from future fields. [2]
The LOGGS facility was principally owned and operated by Conoco, this became ConocoPhillips in 2002. Following cessation of production Chrysaor, a subsidiary of Harbour Energy, assumed ownership of LOGGS in 2019. [3]
The LOGGS installation was located in UK offshore Block 49/16, coordinates 53°23’27”N 02°00’13”E, the water depth is 21 metres. [4]
The installation initially comprised three bridge-linked platforms. These were North Valliant wellhead platform (PD), a Processing platform (PP), and an Accommodation platform (PA). These were commissioned in 1988. To allow lower pressure wells to produce gas a Compression platform (PC) was added to the complex. To cater for production from additional fields a Riser platform (PR) was added to the complex in 1993. [2]
The parameters of the platforms were as follows. [2]
Platform | Function | Legs | Jacket weight, tonnes | Topsides weight, tonnes |
---|---|---|---|---|
LOGGS PD | Wellheads | 4 | 1324 | 602 |
LOGGS PP | Processing | 8 | 2347 | 3950 |
LOGGS PA | Accommodation | 4 | 1444 | 2418 |
LOGGS PC | Compression | 8 | 2109 | 4752 |
LOGGS PR | Import risers | 4 | 1870 | 2499 |
The import and export pipelines connected to the installation were as shown in the following tables. Pipelines were connected to the PP and PR platforms only, there were no pipeline riser connections to the PC, PA or PD platforms. [2]
Pipeline number | LOGGS Platform | From installation | Other connected installations | Fluid | Diameter | Length. km | Installed |
---|---|---|---|---|---|---|---|
PL456 | PP | Vanguard QD | – | Well fluids | 10” | 7.5 | 1988 |
PL458 | PP | Vulcan RD | Vulcan UR | Well fluids | 18” | 16.0 | 1988 |
PL460 | PP | South Valiant TD | – | Well fluids | 10” | 10.6 | 1988 |
PL470 | PP | North Valiant SP | – | Well fluids | 10” | 4.3 | 1988 |
PL496 | PP | Audrey A WD | Audrey VM, Audrey XW, Annabel, Ensign | Well fluids | 20” | 4.3 | 1988 |
PL455 | PP | Theddlethorpe | – | Methanol | 4” | 118.3 | 1988 |
PL854 | PP | Anglia YD | Anglia YM | Well fluids | 12” | 23.6 | 1988 |
PL947 | PR | Ann XM | Ann A4, Alison KX | Well fluids | 12” | 41.8 | 1993 |
PL1093 | PR | Ganymede XD | Callisto ZM, Europa EZ, NW Bell ZX | Well fluids | 18” | 19.1 | 1993 |
PL1692 | PR | Vampire OD | Viscount VO | Well fluids | 12” | 9.2 | 1999 |
PL2107 | PR | Saturn ND | Mimas MN, Tethys TN | Well fluids | 14” | 43.2 | 2005 |
PL2643 | PR | Viking BP | All Viking satellites | Well fluids | 16” | 19.1 | 2009 |
PL2811 | PR | Clipper South RL | – | Well fluids | 12” | 15.1 | 2012 |
The export pipelines connected to the installation were as follows. [2]
Pipeline number | LOGGS Platform | To | Fluid | Diameter | Length. km | Installed |
---|---|---|---|---|---|---|
PL494 | PP | Theddlethorpe | Gas & condensate | 36” | 118.3 | 1988 |
PL457 | PP | Vanguard QD | Methanol | 3” | 7.5 | 1988 |
PL459 | PP | Vulcan RD | Methanol | 3” | 16.0 | 1988 |
PL461 | PP | South Valiant TD | Methanol | 3” | 10.6 | 1988 |
PL471 | PP | North Valiant SP | Methanol | 3” | 4.3 | 1988 |
PL497 | PP | Audrey A WD | Methanol | 3” | 16.5 | 1988 |
PL855 | PP | Anglia YD | Methanol | 3” | 23.6 | 1988 |
PL1094 | PR | Ganymede ZD | Methanol | 3” | 19.1 | 1993 |
PL1693 | PR | Vampire OD | Methanol | 3” | 9.2 | 1999 |
PL2108 | PR | Saturn ND | Methanol | 3” | 43.2 | 2005 |
PL2644 | PR | Viking BP | Methanol | 3” | 19.1 | 2009 |
PL2811 | PR | Clipper South RL | Methanol | 3” | 15.4 | 2012 |
Upon arrival at LOGGS PP or PR the fluids from the satellite platforms and subsea completions were routed to their respective 3-phase Inlet Separators, where the fluids were separated into vapour, water/methanol and condensate. [5] Each of these streams was metered. The condensate and methanol/water streams were recombined and routed to a Condensate Surge Drum from where Condensate Pumps injected the liquids into the gas trunk line to Thedlethorpe. There were two condensate handling systems one on PP and one on PR. [5]
Platform PD was a wellhead platform for the North Valiant field designated North Valliant 1. Well fluids were routed across the bridge to PP and combined with fluids from North Valiant SP (North Valiant 2) and flowed to the North Valiant Separator. [5]
Each of the satellite gas streams could be routed to either the suction manifold, the interstage manifold or directly to the discharge manifold depending on the gas pressure. The compression facility had three trains of two stage compression. From the suction manifold gas flowed to the First Stage Suction Drum where liquids were removed. Gas was compressed in the First Stage Compressor and flowed through the Interstage Cooler where it combined with gas from the interstage manifold. The combined gas stream flowed to the Second Stage Suction Drum where liquids were removed. Gas was compressed in the Second Stage Compressor and flowed through the Aftercooler and then to the 36” trunk line to Theddlethorpe. [5]
Fuel gas for powering the compressor and electricity generation gas turbines could be taken from the interstage or the discharge manifolds. [5]
The gas throughput in million cubic metres per year (mcm/y) for some of the fields which flowed through LOGGS were as follows. [1] [6]
Field | Peak production, mcm/y | Peak year |
---|---|---|
Vanguard | 437 | 1989 |
Vulcan | 1,941 | 1989 |
South Valiant | 1,294 | 1991 |
North Valiant | 680 | 1991 |
Audrey | 2,800 | 1990 |
Anglia | 600 | 1992 |
Ann | 500 | 1994 |
Ganymede | 1,706 | 1996 |
Vampire | 727 | 2000 |
Saturn | 1,598 | 2007 |
Clipper South | 587 | 2014 |
As a consequence of the LOGGS development new gas reception and processing facilities were commissioned at the Theddlethorpe gas terminal. A second 30-inch line (Feeder No. 17) was laid from the Theddlethorpe terminal to Hatton Lincolnshire where it connected to the 36-inch National Transmission System Wisbech to Scunthorpe line (Feeder No. 7). [7]
In November 2012 there was a major gas release on LOGGS. ConocoPhillips were fined £3 million in the subsequent prosecution. [8]
In May 2016 the Low Pressure Vent Knock Out Drum became liquid locked which led to significant release of gas into the workplace. [9]
The Theddletorpe Gas Terminal closed in August 2018. [10] Gas export from LOGGS and its satellite ceased. The following installations were shut-down: Vanguard QD, Vulcan RD, South Valiant TD, North Valiant SP, North Valiant PD, Audrey A WD, Anglia YD, Ganymede ZD, Vampire OD, Saturn ND, a Viking BP. Subsequently their wells were plugged and abandoned and all structures above the seabed were removed.
Gas production from Clipper South, owned by Ineos, was rerouted via a new pipeline to Shell’s Clipped Complex and from there to Bacton Gas Terminal. [11]
In March 2021 Chrysaor submitted plans to decommission and remove the LOGGS installation. It envisages that the platforms would be removed in 2022-23, debris clearance would continue until 2024 and that close out would be in 2025-26. [2]
Norpipe is a subsea oil and natural gas pipelines system in the North Sea. It supplies oil from the Norwegian Ekofisk and associated fields in the North Sea to the United Kingdom and natural gas to Germany.
The Everest gasfield is located in the Central North Sea, 233 kilometres (145 mi) east of Aberdeen, Scotland. It lies in the United Kingdom Continental Shelf blocks 22/9, 22/10a and 22/14a. The gasfield was discovered by Amoco in 1982 with first gas produced in 1993.
The Douglas Complex is a 54-metre (177 ft) high system of three linked platforms in the Irish Sea, 24 kilometres (15 mi) off the North Wales coast. The Douglas oil field was discovered in 1990, and production commenced in 1996. Now operated by Eni, the complex consists of the wellhead platform, which drills into the seabed, a processing platform, which separates oil, gas and water, and thirdly an accommodation platform, which is composed of living quarters for the crew. This accommodation module was formerly the Morecambe Flame jack-up drilling rig.
The Central Area Transmission System is a natural gas transportation and processing system that transports natural gas through a 404 kilometre pipeline from the Central North Sea to a reception and processing terminal at Teesside in the North East of England.
Theddlethorpe Gas Terminal (TGT) is a former gas terminal on the Lincolnshire coast on Mablethorpe Road at Theddlethorpe St Helen close to Mablethorpe in East Lindsey in England. It is just off the A1031 and next door to a holiday camp and Mablethorpe Seal Sanctuary and Wildlife Centre.
The Bacton Gas Terminal is a complex of six gas terminals within four sites located on the North Sea coast of North Norfolk in the United Kingdom. The sites are near Paston and between Bacton and Mundesley; the nearest town is North Walsham.
Rampside Gas Terminal is a gas terminal situated in Barrow-in-Furness, Cumbria on the Irish Sea coast. It connects to gas fields in Morecambe Bay. It is situated adjacent to the former Roosecote Power Station.
The Anglia gas field, is a natural gas field in the United Kingdom's continental shelf of the Southern North Sea. It is located in blocks 48/18 and 48/19 about 60 km (37 mi) east of the Lincolnshire coast. The reservoir is located at a depth of approximately 8,500 feet (2,600 m) subsea. The field was discovered in February 1972. Detailed seismic and appraisal well work were conducted in 1984. The reservoir was estimated to have 235 billion cubic feet of gas in place.
The Teesside oil terminal is a major crude oil reception, processing, storage and export facility at Seal Sands, Middlesbrough. It receives and processes crude oil delivered by the subsea NORPIPE pipeline from the Norwegian Ekofisk field and the UK Fulmar and J-Block fields. The terminal includes facilities for exporting stabilised crude oil and liquefied petroleum gases (LPG) by tanker and pipeline.
The Indefatigable gas field is a large natural gas and associated condensate field located under the North Sea 60 miles off the Norfolk coast.
The Viking gas field is a group of natural gas and associated condensate fields located under the southern North Sea about 85 miles from the Lincolnshire coast. The field was in production from 1972 to 2018.
The Kotter and Logger oil and gas fields are mid-size fields located in the Netherlands sector of the North Sea, about 40 km west of Den Helder and 107 km north west of Amsterdam. The Kotter and Logger oil fields produced oil from 1984/5 to 2015.
The Ravenspurn gas fields are two adjacent natural gas fields located in the UK sector of the southern North Sea about 65 km east of Flambrough Head, Yorkshire.
The K13 gas fields were major natural gas producing fields in the Netherlands sector of the North Sea, about 130 km west of Den Helder. The fields started producing gas in 1975 but are no longer operational except for one installation used as a riser platform.
The Planets gas fields are small natural gas producing areas in the UK sector of the southern North Sea, their names are associated with the planets and moons of the solar system. The fields started gas production from 1995, although some have now (2021) ceased operation.
The Caister Murdoch System (CMS) was a major natural gas collection, processing and transportation system in the UK sector of the southern North Sea. It comprised 11 platforms, 8 subsea wellhead completions and interconnecting pipelines centered about 155 km east of Flamborough Head Yorkshire. It operated from 1993 to 2018.
The Pickerill and Juliet gas fields are decommissioned natural gas producing facilities in the UK sector of the southern North Sea. The fields are located about 66 km (41 mi) east of Spurn Head, Lincolnshire. Pickerill was in operation from 1992 until 2018 and Juliet from 2014 to 2018.
The Clipper gas field is a major natural gas reservoir and gas production facility in the UK sector of the southern North Sea. The field is located about 73 km north-north-east of Bacton, Norfolk; the Clipper production facility has operated since 1990.
The Tyne, Trent and Tors gas fields are depleted natural gas reservoirs and former gas production facilities in the southern North Sea, centred around the Trent installation about 115 km east of Flamborough Head, Yorkshire. The fields produced gas from 1996 to 2020.
The A-Fields are natural gas reservoirs and gas production facilities in the southern North Sea; about 123 km east of Spurn Head, Yorkshire. The fields produced natural gas from 1988 to 2016.
{{cite web}}
: CS1 maint: url-status (link){{cite web}}
: CS1 maint: url-status (link){{cite web}}
: CS1 maint: url-status (link){{cite web}}
: CS1 maint: url-status (link){{cite web}}
: CS1 maint: url-status (link){{cite web}}
: CS1 maint: url-status (link){{cite web}}
: CS1 maint: url-status (link){{cite web}}
: CS1 maint: url-status (link){{cite web}}
: CS1 maint: url-status (link)