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Oil and gas production in the North Sea often involves different companies sharing equipment as they develop new sources of undersea petroleum and ship it to markets. State-of-the-art fluid measuring instrumentation is used to accurately credit the various oil companies involvedwith the amount of product they have shipped over shared pipelines.
In one of the latest projects, gas fields are being developed using subsea “trees” connected to subsea manifold structures. Fluids gathered at the manifolds are conveyed via a number of subsea pipelines to the new bridge linked platform (BLP). To keep track of the product, allocation sampling systems from Jiskoot are being installed;the upgrade will use three Co-Jetix combined mixing and sampling systems in the offshore location.
The systems will collect samples to ensure correct allocation of production fluids before they are exported, allowing accurate production allocation between different fieldsand partners.
Jiskoot was specifically selected for this project because of its experience with engineering sampling and mixing systems for offshore allocation with hydrocarbon condensate liquids with ahigh vapour pressure measured close to the bubble point. The systems will introduce the minimum pressure drop from the mixing to prevent gasbreak-out, while still ensuring that the C1/C2 mixing ratio complieswith the international sampling standard of ISO 3171.
Effective mixing could only be achieved by using a JetMix powered mixer wheremixing energy is added to the flow via a mixing nozzle. The measurement loop will then be installed across the same pump and regulated, if required, to give a homogenous representative liquid flow through the fast loop.
The fast loops will contain densitometers, water-in-oil monitors, 210 sample extractors, new 4-litre sample receivers andpressure and temperature transmitters. The systems will meet full fiscal standards for allocation duty and will be supplied with constant pressure sample receiver mixing systems. They will also include manual sampling points.
The systems all have dual redundant pumps and twin filtration chambers, each rated for 100% capacity. An integral flow changeover valve permits element removal and cleaning without interruption of flow.
The terminal facilities expansion comprises aby-pass train which will add more than 740 million standard cubic feet(mmscf) of gas per day to the current 1,150 mmscf/day capacity of thetwo existing process trains.
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