The plans also envisaged a simple change to the process when a solution became available for gas export. In practice, it turned out that a few simple upgradings would give the plant a daily throughput of more than 100 000 barrels of oil.ĭuring the early production years, most of the gas was injected into Humus. Water injection in the northern and southern parts of Draugen have helped to maintain pressure in the principal reservoir, and thereby improve oil recovery. It was then compressed to 135 bar for injection into the separate Humus formation. Some of the gas was used to fuel the platform’s generators, but most passed through yet another dewatering process. Photo: Shadé Barka Martins/Norwegian Petroleum Museum draugen gasseksport, forsidebilde, engelsk, Gas to the Husmus field. The gas removed from the second-stage separator is mixed with gas from the first stage, compressed to a pressure of 37 bar and cooled to 30☌. It is held temporarily in the big storage cells which form part of the platform’s concrete gravity base structure, before being shipped away by shuttle tanker. More gas is stripped from the stream in this separator and piped away, leaving the oil free from virtually all unwanted components and ready for export. On the way to the next stage, the temperature is raised to 70☌ and pressure lowered to 0.6 bar. Photo: Shadé Barka Martins/Norwegian Petroleum MuseumĪ lot of water and gas are removed in first-stage separation, but more must be extracted before the oil has the right quality. The pipes carry everything from oil, condensate, sea water, produced freshwater to fire and ballast water. det lekker og lekker, 1994, forsidebilde, engelsk, There is a lot of piping on Draugen. Virtually all the condensate remained in the gas stream. Since condensate was considered to be of little value, the process was concentrated on splitting oil and gas into separate products. The original process plant on Draugen was designed to handle a wellstream of up to 135 000 barrels (21 500 standard cubic metres) per day, yielding about 90 000 barrels of oil. Gas, as the lightest component, is drawn off from the top of the tank. Known generally as produced water, the separated volume is discharged directly to the sea. The fluid flow, containing much less gas and water, passes on to the next stage, The wellstream temperature of more than 60☌ and pressure of eight bar make separating oil and gas an easy job.īecause water is heavier than oil, this component can be drawn off at the base of the big separator tank. First-stage separation is the initial step.
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