Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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31.10.2024 - 01:27
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25/2-12

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  • General information
    General information
    Attribute Value
    Wellbore name
    Official name of wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    25/2-12
    Type
    Wellbore type. Legal values: EXPLORATION, DEVELOPMENT, OTHER (see 'Purpose' for more information)
    EXPLORATION
    Purpose
    Final classification of the wellbore.

    Legal values for exploration wellbores:
    WILDCAT, APPRAISAL, WILDCAT-CCS, APPRAISAL-CCS.

    Legal values for development wellbores:
    OBSERVATION, PRODUCTION, INJECTION, INJECTION-CCS, OBSERVATION-CCS.

    Legal values for other wellbores:
    SOIL DRILLING (drilling in connection with track surveys and other subsurface surveys to investigate the soil conditions prior to placement of facilities),
    SHALLOW GAS (drilling to investigate shallow gas before the first 'real' drilling on the location),
    PILOT (drilling to investigate the geology and fluid connectors for location of the main wellbore),
    SCIENTIFIC (drilling according to Law of Scientific research and exploration),
    STRATIGRAPHIC (driling according to Law of Petroleum activities §2-1).
    APPRAISAL
    Status
    Status for the wellbore. Legal values are:

    BLOWOUT: A blowout has occurred in the well.
    CLOSED: A development wellbore that has been closed in a shorter or longer periode. Also applies to development wellbores where drilling is completed, but production/injection has not yet been reported.
    DRILLING: The well is in the drilling phase - can be active drilling, logging, testing or plugging,
    JUNKED: The drilling operation has been terminated due to technical problems.
    P&A: Exploration: The well is plugged and abandoned, and can not be reentered for further use. Development wells: The production/injection from/to the well is stopped and the well is plugged. The wellhead is removed or else made unavailable for further well operations.
    PLUGGED: The wellbore has been plugged, but the upper parts of the wellbore can be re-used. A sidetrack might be drilled at a later stage.
    PRODUCING: It was produced from the wellbore at the time of the operators last monthly report to the Norwegian Offshore Directorate.
    INJECTING: It was injected to the wellbore at the time of the operators last monthly report to the Norwegian Offshore Directorate.
    PREDRILLED: The upper part of the well has been drilled, usually as part of a batch-drilling campaign covering several wellbores.
    RE-CLASS TO DEV: Exploration wellbore that is reclassified to a development wellbore.
    RE-CLASS TO TEST: Exploration wellbore that is reclassified to test production.
    SUSPENDED: The drilling operation in the wellbore has been temporarily stopped. The current plan is to continue drilling later on.
    P&A
    Multilateral
    Indicator telling if the parent well is multilateral, meaning it has more than one branch radiating from the main borehole. Example of legal values: YES, NO. See also Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    NO
    Factmaps in new window
    Main area
    Name of the area on the Norwegian Continental Shelf where the wellbore is located. Legal values: BARENTS SEA, NORWEGIAN SEA, NORTH SEA.
    NORTH SEA
    Field
    Name of the field the wellbore is related to.
    Discovery
    Name of the discovery the wellbore is related to.
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    25/2-12
    Production licence
    Official designation of the production licence the wellbore was drilled or planned to be drilled from ( well head posistion).
    Drilling operator
    Name of the licensee starting the drilling operation on behalf of the active production license (well head position). This will usually equal the operator of the production license.
    Elf Petroleum Norge AS
    Drill permit
    The drilling permit number together with the version of the drilling permit as stated in the drilling permit granted by the Norwegian Offshore Directorate.
    584-L
    Drilling facility
    Norwegian Offshore Directorate's name of the facility which the wellbore was drilled from.
    Drilling days
    Number of days from wellbore entry to wellbore completion.
    119
    Entered date
    The date when he wellbore was spudded. For sidetracks: The date when new formation was drilled by kicking off from the mother-wellbore,
    17.07.1988
    Completed date
    Exploration wellbores from moveable facilities:
    For floating facilities - date when anchor handling is started. For jackups - date the jacking-down started. Exploration wellbores from fixed facilities and all development wellbores:
    Date when the wellbore is at total depth, and last casing, liner or screen is set. In case of immediate plugging of the wellbore, completed date equals the date the last plug i set in the wellbore.
    Date when the wellbore is at total depth, and last casing, liner or screen is set. In case of immediate plugging of the wellbore, completed date equals the date the last plug i set in the wellbore.
    12.11.1988
    Release date
    Date when raw data which has been reported to the authorities from the wellbore is not confidential any longer. Normally 2 years after finishing the drilling. May be earlier if the area of the production license is relinquished.
    12.11.1990
    Publication date
    Date quality control of the wellbore information was completed, so it can be published on the internet as a 'Well Data Summary Sheet' wellbore with more information available than other wellbores.
    17.12.2003
    Purpose - planned
    Pre-drill purpose of the wellbore. Legal values for exploration wellbores: WILDCAT, APPRAISAL, WILDCAT-CCS, APPRAISAL-CCS. Example of legal values for development wellbores: OBSERVATION, PRODUCTION, INJECTION.
    APPRAISAL
    Content
    For exploration wellbores, status of discovery.

    Legal values:
    DRY, SHOWS (trace amounts of hydrocarbons), GAS, GAS/CONDENSATE, OIL or OIL/GAS.
    SHOWS (GAS SHOWS, OIL SHOWS or OIL/GAS SHOWS) are detected as fluorescent cut (organic extract), petroleum odour, or visual stain on cuttings or cores, or as increased gas reading on the mud-loggers gas detection equipment.
    Legal values for WILDCAT-CCS and APPRAISAL-CCS: WATER

    For development wellbores, type of produced/injected fluid.
    Legal values:
    WATER, CUTTINGS, NOT AVAILABLE, OIL, GAS/CONDENSATE, OIL/GAS, CO2, GAS, WATER/GAS, NOT APPLICABLE.
    GAS/CONDENSATE
    Discovery wellbore
    Indicator which tells if the wellbore made a new discovery. Legal values: YES, NO. Prior to press-release or other information regarding drilling results, the indicator will be “NO” as a default.
    NO
    1st level with HC, age
    Age of lithostratigraphic unit, 1st level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE. See also Norwegian Offshore Directorate bulletins.
    MIDDLE JURASSIC
    1st level with HC, formation
    Name of lithostartigraphic unit, 1st level, where hydrocarbons were encountered. Shown only for released wells. Examples of legal values: BASEMENT, COOK FM, EKOFISK FM, HEIMDAL FM, SANDNES FM, SOGNEFJORD FM, TARBERT FM, BRENT GP. See also Norwegian Offshore Directorate bulletins.
    HUGIN FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    22.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    115.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4102.0
    Final vertical depth (TVD) [m RKB]
    Vertical elevation from total depth to kelly bushing. Shown only for released wells. Referred to as true vertical depth (TVD).
    4102.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    2.8
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    150
    Oldest penetrated age
    Age (according to Geologic Time Scale 2004 by F. M. Gradstein, et al. (2004)) of the oldest penetrated formation. May differ from age at TD for example in deviated wellbores. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EARLY PERMIAN, EARLY TRIASSIC, EOCENE.
    EARLY JURASSIC
    Oldest penetrated formation
    Name of the oldest lithostratigraphic unit penetrated by the wellbore. Shown only for released wells. In most wellbores this is formation or group at total depth. May differ from formation or group at TD for example in wellbores drilled with high deviation or through faults. Examples of legal values: AMUNDSEN FM, BALDER FM, BASEMENT, BLODØKS FM, BRYNE FM, BURTON FM, COOK FM, DRAKE FM, DRAUPNE FM, EKOFISK FM, DUNLIN GP.
    STATFJORD GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 57' 48.34'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 23' 40.78'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6647648.17
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    466196.96
    UTM zone
    Universal Transverse Mercator zone. Examples of legal values: 31, 32, 33, 34.
    31
    NPDID wellbore
    Norwegian Offshore Directorate's unique id for the wellbore.
    1290

  • Wellbore history
    General
    Well 25/2-12 was the second hole drilled on an NNESSV-oriented structural height in the northwestern part of the block. Well 25/2-4, which was drilled in 1975 in a more down flank position, found a 21 m gas column and a 48 m oil column in the Vestland Group. The Statfjord Formation was water bearing in 25/2-4, but its position was not optimal on the structure with regards to the Jurassic prospects.
    The main objective of well 25/2-12 was to examine the Statfjord Formation higher up on the structure than 25/4-2, including getting more information about the oil and gas discovery in the Vestland Group.
    Operations and results
    Appraisal well 25/2-12 was spudded 17 July 1988 by Smedvig semi-submersible rig West Vanguard and completed 13 November 1988 at a depth of 4103 m in the Late Jurassic Statfjord Formation. A 17 1/2" pilot hole was drilled from 197- 907 m and then opened to 26". Sand layers were encountered at 214 m and 259 m RKB, and MWD measurements showed no indication of shallow gas. Drilling proceeded without any significant problems down to 1366 m where metamorphic gravel plugged the bit so that it had to be changed. During clean-up of the hole, mud was lost to the sand formation at 890 m to 1000 m. "Lost circulation material" (LCM) was pumped into the well to isolate it. The well was in periods unstable.
    The Frigg Formation was water bearing. The gas readings were at times very high (up to 80 %). There was danger of losing the mud in Turonian limestone. Some fractures were observed higher up in the section. There were traces of gas in the limestone. Top Vestland Group came in at 3685.5 m, 112 m deeper than prognosed. The reason for this was assumed to be that the top of the Vestland Group had been faulted. The fluid contact was set to 3701 m. Analysis of this showed that it was a condensate column of 15 m. A total of five cores were cut. Core 1 was a "junk core". Cores 2 & 3 were cut in the Vestland Group and core 4 in the Dunlin Group. Core 4 was for geochemical studies. Core 5 was cut in the Statfjord Formation. RFT fluid sampling at 3697.2 m gave recovered 3.5 l mud filtrate, 1.1 l condensate/oil, and 1.8 Sm3 gas.
    When the Statfjord Formation was found water bearing, the NPD permitted EAN to change TD from 4225 m (Triassic) to 4100 m (113 m into the Statfjord Formation). It was plugged and abandoned as a gas/condensate appraisal.
    Testing
    One DST test was attempted in the interval 3685.5 m to 3690.5 m, but had to be stopped due to large sand production.

  • Cuttings at the Norwegian Offshore Directorate
    Cuttings at the Norwegian Offshore Directorate
    Cuttings available for sampling?
    YES
    Cuttings at the Norwegian Offshore Directorate
    Cutting sample, top depth [m]
    Cutting samples, bottom depth [m]
    910.00
    4100.00

  • Cores at the Norwegian Offshore Directorate
    Cores at the Norwegian Offshore Directorate
    Core sample number
    Core sample - top depth
    Core sample - bottom depth
    Core sample depth - uom
    2
    3685.0
    3686.1
    [m ]
    3
    3690.0
    3715.4
    [m ]
    4
    3943.0
    3952.2
    [m ]
    5
    3994.0
    4019.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    60.7
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3685-3686m
    Core photo at depth: 3685-3686m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    3685-3686m
    3685-3686m
    3690-3715m
    3690-3715m
    3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3690-3715m
    Core photo at depth: 3943-3948m
    3690-3715m
    3690-3715m
    3690-3715m
    3690-3715m
    3943-3948m
    Core photo at depth: 3948-3952m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    3948-3952m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4919m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    3994-4019m
    3994-4919m
    3994-4019m
    3994-4019m
    3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth: 3994-4019m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3994-4019m
    3994-4019m

  • Casing and leak–off tests
    Casing and leak–off tests
    Casing type
    Casing diam.
    [inch]
    Casing depth
    [m]
    Hole diam.
    [inch]
    Hole depth
    [m]
    LOT/FIT mud eqv.
    [g/cm3]
    Formation test type
    CONDUCTOR
    30
    197.0
    36
    199.0
    0.00
    LOT
    SURF.COND.
    20
    890.0
    26
    912.0
    1.25
    LOT
    INTERM.
    13 3/8
    2848.0
    17 1/2
    2879.0
    1.88
    LOT
    INTERM.
    9 5/8
    3412.0
    12 1/4
    3512.0
    2.05
    LOT
    LINER
    7
    4102.0
    8 1/2
    4102.0
    0.00
    LOT

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    3686
    3691
    0.0
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    Drill stem tests (DST)
    Test number
    Oil
    [Sm3/day]
    Gas
    [Sm3/day]
    Oil density
    [g/cm3]
    Gas grav. rel.air
    GOR
    [m3/m3]
    1.0

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL GR
    648
    3780
    CST GR
    1021
    2469
    DIL SLS GR SP
    880
    4101
    DLL MSFL GR
    3593
    3818
    FMS GR
    3412
    4013
    LDL CNL NGT GR
    3415
    4103
    LDL GR
    890
    3383
    MWD
    199
    4090
    RFT GR
    3687
    3797
    VSP
    199
    3800

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.60

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.67
    pdf
    1.15

  • Documents – reported by the production licence (period for duty of secrecy expired)
    Documents – reported by the production licence (period for duty of secrecy expired)
    Document name
    Document format
    Document size [MB]
    pdf
    32.58

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    1195
    1.12
    43.0
    16.6
    WATER BASED
    27.07.1988
    1355
    1.14
    35.0
    14.2
    WATER BASED
    28.07.1988
    1367
    1.13
    32.0
    10.7
    WATER BASED
    29.07.1988
    1508
    1.14
    33.0
    10.7
    WATER BASED
    01.08.1988
    1707
    1.17
    35.0
    12.7
    WATER BASED
    01.08.1988
    1993
    1.20
    30.0
    9.8
    WATER BASED
    10.08.1988
    2054
    1.19
    29.0
    12.2
    WATER BASED
    11.08.1988
    2134
    1.19
    34.0
    13.7
    WATER BASED
    12.08.1988
    2134
    1.19
    30.0
    10.7
    WATER BASED
    15.08.1988
    2296
    1.19
    30.0
    10.7
    WATER BASED
    15.08.1988
    2427
    1.19
    32.0
    12.7
    WATER BASED
    15.08.1988
    2453
    1.22
    32.0
    12.2
    WATER BASED
    16.08.1988
    2572
    1.22
    28.0
    11.7
    WATER BASED
    19.08.1988
    2594
    1.22
    23.0
    10.7
    WATER BASED
    19.08.1988
    2599
    1.24
    28.0
    9.3
    WATER BASED
    22.08.1988
    2607
    1.24
    27.0
    10.7
    WATER BASED
    22.08.1988
    2629
    1.24
    26.0
    10.7
    WATER BASED
    23.08.1988
    2651
    1.24
    24.0
    10.7
    WATER BASED
    24.08.1988
    2688
    1.24
    25.0
    9.8
    WATER BASED
    25.08.1988
    2736
    1.24
    24.0
    11.7
    WATER BASED
    26.08.1988
    2767
    1.24
    27.0
    12.7
    WATER BASED
    29.08.1988
    2795
    1.24
    35.0
    12.7
    WATER BASED
    30.08.1988
    2863
    1.26
    34.0
    13.7
    WATER BASED
    31.08.1988
    2867
    1.28
    36.0
    11.7
    WATER BASED
    02.09.1988
    2867
    1.30
    23.0
    10.7
    WATER BASED
    05.09.1988
    2879
    1.50
    34.0
    9.3
    WATER BASED
    14.09.1988
    2936
    1.53
    35.0
    9.8
    WATER BASED
    15.09.1988
    2958
    1.53
    34.0
    9.3
    WATER BASED
    16.09.1988
    3021
    1.53
    36.0
    13.7
    WATER BASED
    19.09.1988
    3157
    1.66
    36.0
    10.2
    WATER BASED
    19.09.1988
    3221
    1.74
    37.0
    9.8
    WATER BASED
    20.09.1988
    3281
    1.79
    33.0
    9.8
    WATER BASED
    21.09.1988
    3325
    1.85
    35.0
    9.8
    WATER BASED
    22.09.1988
    3369
    1.85
    36.0
    9.8
    WATER BASED
    26.09.1988
    3392
    1.85
    33.0
    9.8
    WATER BASED
    26.09.1988
    3803
    1.92
    49.0
    11.7
    WATER BASED
    14.10.1988
    3910
    1.92
    53.0
    13.7
    WATER BASED
    20.10.1988
    3948
    1.92
    58.0
    13.7
    WATER BASED
    24.10.1988
    3982
    1.92
    52.0
    10.7
    WATER BASED
    24.10.1988
    4008
    1.92
    53.0
    13.7
    WATER BASED
    24.10.1988
    4052
    1.92
    50.0
    13.7
    WATER BASED
    24.10.1988