Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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22.11.2024 - 09:09
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25/12-1

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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.
    25/12-1
    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.
    25/12-1
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    LINE SC 59 SP.2145
    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.
    A/S Norske Shell
    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.
    95-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.
    82
    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,
    03.10.1973
    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.
    23.12.1973
    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.
    23.12.1975
    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.
    01.12.2004
    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.
    34.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    135.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2865.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    2.5
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    93
    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.
    DEVONIAN
    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.
    NO GROUP DEFINED
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 1' 47'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 49' 17.1'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6543526.23
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    489748.32
    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.
    374

  • Wellbore history
    Well 25/12-1 is located on the Patch Bank Ridge between the Utsira High and the Stord Basin in the North Sea. The well was designed to test Paleocene sand and late Cretaceous chalk prospects (found oil bearing in the adjacent Esso blocks). Additional objectives were the Mesozoic and possibly older sands, which formed part of a monocline, east dipping subcrop below this structure. The well was programmed to investigate the entire sedimentary sequence down to igneous/metamorphic basement, interpreted to occur at approximately 2743 m.
    Operations and results
    Wildcat well 25/12-1 was spudded with the semi-submersible installation SEDCO 135 G on 3 October 1973 and drilled to TD at 2865 m in rocks of possible Devonian age. The spud was delayed due to rig repairs in Hamburg. This resulted in the well being drilled during the worst of the winter weather. Due to adverse weather and bad anchoring conditions, 14.5 days were spent anchoring the rig. A total of 19.7 days was lost directly due to weather during drilling and abandoning. A further 8.7 days were lost repairing underwater equipment, much of which was also due to weather damage. The well was drilled with seawater and bentonite down to 463 m and with a seawater / lignosulphonate mud from 463 m to TD.
    The Oligocene-Eocene sands of the Hordaland Group were water bearing and the Paleocene sands absent. The Chalk section (Tor and Hod formations) showed poor reservoir characteristics and was also water bearing. Below the Late Jurassic shale sequence sands and conglomerates of Middle Jurassic age and older were penetrated. The sands were penetrated in a down dip position on a monoclinal structure rising towards block 25/11. Middle Jurassic (Vestland Group) sands were encountered at 2244 m with porosity up to 30 %, averaging 18 %. Conglomerates were encountered at 2425 m and extended down to 2671 m. From this point down to TD at 2865 m the well drilled a thick water bearing sand sequence. This possible Devonian sandstone ranged in porosity from 17 % - 23 % with an average of 20 %. No hydrocarbon indications were present in the well, with the exception of characteristic gas indications in the Late Jurassic Draupne Formation source rock interval, which at this location was found to be immature. In view of the discouraging results obtained thus far, together with the fact that no seismic configuration was mappable below this depth, it was decided to abandon the well without having reached igneous rock. One core was cut in the ?Devonian conglomerate from 2450 m to 2456 m. No fluid sample was taken
    The well was permanently abandoned as dry on 23 November 1973.
    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]
    262.13
    2865.12

  • 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
    8037.1
    8055.4
    [ft ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    5.6
    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
    6800.0
    [ft]
    DC
    6850.0
    [ft]
    DC
    6910.0
    [ft]
    DC
    6960.0
    [ft]
    DC
    7010.0
    [ft]
    DC
    7040.0
    [ft]
    DC
    7080.0
    [ft]
    DC
    7110.0
    [ft]
    DC
    7180.0
    [ft]
    C
    7200.0
    [ft]
    DC
    7210.0
    [ft]
    DC
    7260.0
    [ft]
    DC
    7310.0
    [ft]
    DC
    7340.0
    [ft]
    DC
    7360.0
    [ft]
    DC
    7410.0
    [ft]
    DC
    7440.0
    [ft]
    DC
    7460.0
    [ft]
    DC
    7510.0
    [ft]
    DC
    7540.0
    [ft]
    DC
    7550.0
    [ft]
    DC
    7550.0
    [ft]
    C
    7580.0
    [ft]
    DC
    7630.0
    [ft]
    DC
    7630.0
    [ft]
    C
    7650.0
    [ft]
    DC
    7680.0
    [ft]
    DC
    7680.0
    [ft]
    C
    7710.0
    [ft]
    DC
    7720.0
    [ft]
    DC
    APT
    7730.0
    [ft]
    DC
    7750.0
    [ft]
    DC
    APT
    7760.0
    [ft]
    DC
    7760.0
    [ft]
    C
    7780.0
    [ft]
    DC
    APT
    7810.0
    [ft]
    DC
    7820.0
    [ft]
    DC
    APT
    7830.0
    [ft]
    DC
    7850.0
    [ft]
    DC
    APT
    7860.0
    [ft]
    C
    7860.0
    [ft]
    DC
    7880.0
    [ft]
    DC
    APT
    7900.0
    [ft]
    DC
    APT
    7910.0
    [ft]
    DC
    7920.0
    [ft]
    DC
    APT
    7920.0
    [ft]
    DC
    APT
    7930.0
    [ft]
    DC
    APT
    7940.0
    [ft]
    DC
    7950.0
    [ft]
    DC
    APT
    7960.0
    [ft]
    DC
    7990.0
    [ft]
    DC
    8010.0
    [ft]
    DC
    8060.0
    [ft]
    C

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.34

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.41
    pdf
    3.06

  • 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
    0.36
    pdf
    1.81
    pdf
    3.06

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    BHC GR
    136
    456
    BHC GR
    1357
    2864
    CNL FDC
    1357
    2864
    CST
    1996
    2850
    HDT
    1357
    2864
    IES
    456
    2864
    VSP
    183
    2864

  • 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
    244.0
    36
    250.0
    0.00
    LOT
    SURF.COND.
    20
    456.0
    26
    460.0
    0.00
    LOT
    INTERM.
    13 3/8
    1356.0
    17 1/2
    1360.0
    0.00
    LOT
    INTERM.
    9 5/8
    1978.0
    12 1/4
    1980.0
    0.00
    LOT
    OPEN HOLE
    2865.0
    8 1/2
    2865.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    375
    1.10
    75.0
    spud mud
    771
    1.10
    43.0
    spud mud
    1208
    1.15
    40.0
    spud mud
    2472
    1.25
    53.0
    mixed mud
    2864
    1.24
    52.0
    mixed mud