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The first underwater compressor for liquefied gas

03 June 2015
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"Oleg Strashnow", a heavy lift crane vessel, transported and set up the first underwater compressor for liquid gas in the world. The plant will be installed in the Norwegian Sea, about 15 kilometers far from the platform Gulfaks C.

Underwater compressor for liquefied petroleum gas is a joint project of Statoil company and partners. Due to this important technological leap, more efficient extraction of gas and its by-products will be possible, and it will extend the lifespan of the undersea gas deposits. Statoil expects an increase in productivity by 16%, from 63% to 73%, ie continuous production of 282 million barrels of gas. An important step towards the first underwater plant is made with this project.

Construction of the plant was technologically demanding project. It consists of 463 tons of metal protective structures, 716 tons of the plant including two 5 MW compressors and two coolers. The plant will enable the flow of 10 million cubic meters a day, and will be connected with the two existing gas pipelines located at a depth of 135 m below the sea surface.

Why was the underwater compressor made?

When the required pressure in the gas findings falls below the critical level, the site is left as it is no longer possible to get gas. Underwater compressor will enable the maintenance of the required pressure in the gas pipeline to continue the efficient extraction of liquid gas. Besides, by using compressor there is no need for separation of the liquid gas and other fluids.

Unlike conventional compressors, underwater compressor allows stable operation, higher efficiency, lower power consumption and reduced CO2 emissions by 50%.

The important fact about underwater compressor for liquid gas:
- increased production by 22 million barrels of gas
- 2 x 5 MW compressors for liquid gas
- depth: 135 m
- Dimensions: 34m x 20m x 12m
- capacity of increasing pressure: 32-60 bar (depending on whether compressors are connected in parallel or in series)
- owned by: Statoil (70%), Petoro (30%)
- plant produced by: Aker Solutions


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