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    1. Refining & Processing
    2. Petrochemicals

    GUIDE TO WORLD CRUDES: Statoil issues Snohvit condensate update

    Nov. 7, 2011
    Statoil has updated an assay of the condensate stream associated with natural gas being produced from Snohvit field in the Barents Sea.
    110801ogjpst1

    Statoil has updated an assay of the condensate stream associated with natural gas being produced from Snohvit field in the Barents Sea.

    The field lies on Blocks 7120 and 7121 in the Barents Sea, west northwest of the island of Hammerfest, Norway (OGJ, Apr. 9, 2007, p. 48). It sends natural gas via a 143-km (88.8-mile) subsea pipeline to the world's only gas liquefaction plant, on Melkoye Island. (A map of the field's location appears in OGJ, June 16, 2008, p. 46.)

    The gas processing plant at the Hammerfest LNG plant received gas from Snohvit in August 2007 (OGJ, Aug. 27, 2007, p. 10), but full production was delayed by leaks in the cooling system until early 2008 (OGJ, Feb. 4, 2008, p. 10).

    Snohvit produces without fixed or floating units in the Barents Sea. Instead, subsea production units stand on the seabed in water 250-345 m deep. A total of 20 wells are to produce gas from the Snohvit, Askeladd, and Albatross fields, says Statoil; 9 wells are planned on Snohvit, including 8 for production and 1 for reinjecting CO2.

    Six of the producers and the CO2 injection well were drilled 2004-05, with the remaining two following this year. In addition, production wells were drilled on Albatross in 2005-06; this field also forms part of the Snohvit development. Snohvit and Albatross wells came on stream in 2007; Askeladd is due to come on stream in 2014-15.

    110801ogjpst1
    Well stream from the Snohvit offshore fields arrives at the Hammerfest LNG plant under 70-90 bar and between –5° C. and 4° C. The stream first passes through this large slug catcher, which buffers or disperses liquid slugs and separates natural gas, condensate, and a water-monoethylene glycol mixture. The condensate flows to the condensate separator. Photograph from Statoil; by Harald Pettersen.

    Partners in Snohvit are Statoil (operator, 33.53%), Petoro (30%), Total E&P Norge (18.40%), GDF Suez E&P Norge (12%), Hess Norge (3.26%), and RWE Dea Norge (2.81%).

    Whole crude

    Density at 15º C., kg/l.: 0.7339

    Dry oil density15º C., kg/l.: 0.7339

    API gravity at 60/60° F.: 61.3

    Specific gravity at 60/60° F.: 0.7341

    Sulfur, mass %: 0.020

    Total acid no.: my KOH/g: <0.01

    Reid vapor pressure, kPa: 48.6

    Pour point, °C.: <–48

    Flash point, °C.: <10

    Vis. at 20° C., cst: 0.71

    Vis. at 40° C., cst: 0.58

    Nitrogen, mg/kg: 3

    Hydrogen sulfide, mass %: ND1

    Vanadium, mg/kg: <0.1

    Nickel, mg/kg: <0.1

    Sodium, mg/kg: <0.1

    Mercury, µg/k: <1.0

    Salt as NaCl, mg/l.: <5.0

    Wax content, mass %: NA

    Water content, mass %: <0.02

    Pentanes to 65° C.

    Yield on crude, mass %: 22.63

    Yield on crude, vol %: 25.72

    Density at 15° C., kg/l.: 0.6433

    Specific gravity at 60/60° F.: 0.6433

    API gravity at 60/60° F.: 88.5

    Mercaptan sulfur, mg/kg: 8

    n-Paraffins, mass %: 45.2

    i-Paraffins, mass %: 48.5

    Naphthenes, mass %: 4.5

    Aromatics (incl. benzene), mass %: 1.8

    n-Paraffins, vol %: 45.7

    i-Paraffins, vol %: 49.1

    Naphthenes, vol %: 3.8

    Aromatics (incl. benzene), vol %: 1.3

    Vapor pressure (DVPE1), kPa: 107.9

    Research octane no. (RON): 76.3

    Motor octane no. (MON): 73.8

    Research octane no. (RON): 276.1

    Motor octane no. (MON): 273.6

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