physics

Lincolnshire Offshore Gas Gathering System

Lincolnshire Offshore Gas Gathering System is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lincolnshire Offshore Gas Gathering System rather than just read about it. In short: 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.

Key takeaways

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Reference excerpt

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.

Background The development of the Audrey, North Valliant, South Valiant, Vanguard and Vulcan gas fields 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. 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.

The LOGGS installation 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. 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. The parameters of the platforms were as follows.

Import and export 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.

The export pipelines connected to the installation were as follows.

Process facilities 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. 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. 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. 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. Fuel gas for powering the compressor and electricity generation gas turbines could be taken from the interstage or the discharge manifolds.

Throughput The gas throughput in million cubic metres per year (mcm/y) for some of the fields which flowed through LOGGS were as follows.

Terminal redevelopment 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).

Incidents In November 2012 there was a major gas release on LOGGS. ConocoPhillips were fined £3 million in the subsequent prosecution. In May 2016 the Low Pressure Vent Knock Out Drum became liquid locked which led to significant release of gas into the workplace.

Decommissioning The Theddletorpe Gas Terminal closed in August 2018. 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. 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.

See also Arthurian gas fields Planets gas fields Viking gas field Theddlethorpe Gas Terminal List of oil and gas fields of the North Sea Caister Murdoch System Pickerill and Juliet gas fields Clipper gas field A-Fields natural gas fields

References

Worked examples

Example 1 — a first encounter with Lincolnshire Offshore Gas Gathering System

Start with the simplest possible case. Write down what Lincolnshire Offshore Gas Gathering System claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lincolnshire Offshore Gas Gathering System before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lincolnshire Offshore Gas Gathering System ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lincolnshire Offshore Gas Gathering System

In research: Lincolnshire Offshore Gas Gathering System appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lincolnshire Offshore Gas Gathering System in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lincolnshire Offshore Gas Gathering System is common in secondary-school and first-year university syllabi. It links to neighbouring topics Lists of oil and natural gas fields, Natural gas fields in the United Kingdom, North Sea energy, so understanding it makes those chapters shorter.
In everyday life: Look for Lincolnshire Offshore Gas Gathering System outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lincolnshire Offshore Gas Gathering System in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lincolnshire Offshore Gas Gathering System means in your own words.
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Frequently asked questions

What is Lincolnshire Offshore Gas Gathering System in simple terms?

Why does Lincolnshire Offshore Gas Gathering System matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lincolnshire Offshore Gas Gathering System?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lincolnshire Offshore Gas Gathering System.