Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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2/6-4 S

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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.
    2/6-4 S
    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).
    WILDCAT
    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
    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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    2/6-4
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    G 2/6-88-207 SP 814
    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.
    632-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.
    56
    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,
    08.04.1990
    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.
    02.06.1990
    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.
    02.06.1992
    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.
    09.03.2009
    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.
    WILDCAT
    Reentry
    Status whether the wellbore has been re-entered (YES) or not (NO). Re-entered wellbores are not included in the count when wellbores are presented in statistical overviews.
    NO
    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.
    DRY
    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
    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.
    55.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3617.0
    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).
    3584.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    17.6
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    129
    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.
    LATE PERMIAN
    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.
    ZECHSTEIN GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    56° 38' 59.29'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 47' 23.27'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6278823.48
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    548430.04
    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.
    1527

  • Wellbore history
    General
    Well 2/6-4 S is located in the northwest part of the Søgne Basin in the North Sea. It was drilled on the flank of a salt dome. The objectives were to evaluate the potential of the Late and Middle Jurassic series, which were supposed to accommodate three reservoirs; turbiditic sands in the Mandal-Farsund Formations, shallow marine Ula Formation sands of Kimmeridgian to Volgian age, and fluvial sands of the Middle Jurassic. Oil was expected with only small amounts of associated gas.
    Operations and results
    Wildcat well 2/6-4 S was spudded with the semi-submersible installation West Vanguard on 8 April 1990 and drilled to TD at 3627 m (3617 m drillers depth, 3584 m TVD MSL drillers depth) in the Late Permian Zechstein Group. The well was drilled deviated down to 2330 m to avoid possible shallow gas pockets seen on seismic. No shallow gas was encountered. From 2330 m it was drilled with an average of 15 deg dip to the target at 3402 m, then dropping of to less than 10 deg dip for the rest of the well down to TD. No significant drilling problems occurred during drilling operations, but due to a problem of tie-in with gamma ray drillers depth was 10 m shallower than logger's depth in the lower part of the well.
    The results of the well were disappointing since the Ula formation was missing, and only two meters of Kimmeridgian sands were encountered at 3537 m (3527 m driller's depth). These sands were very glauconitic, silty and well cemented with porosity estimated around 5-7%. The Bryne formation was thicker than expected, but had limited reservoir quality with only some thin sand beds separated by shaley layers towards the base of the Formation. All Jurassic sands were water bearing without shows, except for some fluorescence in fissures in a coal at the top of the Bryne Formation. Small shows at 2930 to 3040 m (in upper Tor Formation) were described as: "- background gas increases and remains between 1 to 7.7 % (max at 2970 m) with presence of C1 to traces of C5. On this interval, direct fluorescence was observed on cuttings (10 to 20 % light yellow spots) with a slow to moderate streaming pale milky cut fluorescence."
    One core was cut at 3530 m in the Middle-Late Jurassic with 67% recovery 67%, (4 m). Two runs of SWC were run with a recovery 50 SWC. Since no significant reservoir was encountered no RFT pressures or fluid samples were acquired.
    The well was permanently abandoned on 2 June 1990 as a dry well.
    Testing
    No drill stem test was performed.

  • 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]
    520.00
    3617.00

  • 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
    1
    3530.0
    3534.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    4.0
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    3430.0
    [m]
    DC
    APT
    3440.0
    [m]
    DC
    APT
    3450.0
    [m]
    DC
    APT
    3465.0
    [m]
    DC
    APT
    3470.0
    [m]
    DC
    APT
    3480.0
    [m]
    DC
    APT
    3490.0
    [m]
    DC
    APT
    3500.0
    [m]
    DC
    APT
    3510.0
    [m]
    DC
    APT
    3517.5
    [m]
    DC
    APT
    3527.5
    [m]
    DC
    APT
    3540.0
    [m]
    DC
    APT
    3550.0
    [m]
    DC
    APT

  • Lithostratigraphy

  • 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
    2.62
    pdf
    7.87

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL GR
    800
    2267
    CST GR
    1200
    2203
    CST GR
    3404
    3611
    DIL DDBHC GR AMS SP
    3334
    3627
    DIL LDL DDBHC GR AMS SP
    1001
    2286
    DIL LDL DDBHC GR AMS SP
    2267
    3345
    FMS GR
    3334
    3628
    LDT CNL AMS NGT
    3334
    3628
    MWD
    139
    3617
    VSP
    930
    3320
    VSP
    3340
    3610

  • 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
    137.0
    36
    140.0
    0.00
    LOT
    INTERM.
    20
    1002.0
    26
    1007.0
    1.75
    LOT
    INTERM.
    13 3/8
    2267.0
    17 1/2
    2270.0
    1.92
    LOT
    INTERM.
    9 5/8
    3331.0
    12 1/4
    3331.0
    1.96
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    1204
    1.29
    22.0
    14.7
    DUMMY
    19.04.1990
    2225
    1.40
    33.0
    15.6
    DUMMY
    23.04.1990
    2283
    1.45
    31.0
    18.6
    DUMMY
    24.04.1990
    2314
    1.55
    20.0
    9.8
    WATER BASED
    30.04.1990
    2523
    1.55
    24.0
    10.7
    WATER BASED
    30.04.1990
    3487
    1.60
    24.0
    9.8
    WATER BASED
    21.05.1990
    3530
    1.60
    23.0
    9.8
    WATER BASED
    22.05.1990
    3536
    1.60
    20.0
    9.8
    WATER BASED
    23.05.1990