Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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22.11.2024 - 09:09
Time of last synchronization with Norwegian Offshore Directorate's internal systems

15/12-4

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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.
    15/12-4
    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
    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.
    15/12-4
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    ST 8315/106 SP. 2105
    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.
    Den norske stats oljeselskap a.s
    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.
    433-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.
    49
    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,
    13.09.1984
    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.
    31.10.1984
    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.
    31.10.1986
    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.
    15.08.2008
    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.
    OIL
    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.
    YES
    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.
    23.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    87.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3157.0
    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).
    3156.0
    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.
    114
    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.
    TRIASSIC
    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.
    58° 3' 9.16'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    1° 54' 11.61'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6435232.25
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    435264.02
    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.
    438

  • Wellbore history
    Wildcat well 15/12-4 is located on the Maureen Terrace in the South Viking Graben in the North Sea. The primary objectives were the Palaeocene Heimdal Formation and sandstones of Jurassic and Triassic age. Secondary objectives were the Frigg Formation and fractured limestone in the Cretaceous.
    Operations and results
    Well 15/12-4 was spudded with the semi-submersible installation Deepsea Bergen on 13 September 1984 and drilled to TD at 3157 m, 17 m into the Triassic Group. Operations were completed within the time schedule and with very few problems. The well was drilled with seawater and gel down to 505 m, with gypsum polymer from 505 m to 2680 m, and with lignosulphonate from 2680 m to TD.
    No Heimdal or Frigg sands were encountered in the well. From logs and cores hydrocarbons were seen in the uppermost part of the Cretaceous chalk in the interval 2490 ? 2515 m. Core analysis and log analysis indicated very poor reservoir properties in this chalk. The water saturation was high (60 - 80 %) and the permeability was extremely low (0.01 - 0.5 mD). A 1.5 meter oil column was seen in the Jurassic sandstone, from 2911.5 to 2913 m with a transition zone down to 2915.5. Apart from these two intervals there were no shows or other hydrocarbon indications in the well.
    Four cores were cut, one in the Palaeocene, two in the Late Cretaceous and one in the Late Jurassic sequence. One FMT run was made in the Cretaceous. Here, no pressure points out of 19 attempts were successful due to seal failure and very low permeability in the formation. One attempt to get sample at 2439.5 m failed due to tight formation. In the Jurassic a segregated FMT sample was taken at 2912 m (5.8 l oil with a density of 0.847 g/cm3 in the 2 3/4 gallon chamber) and a second segregated sample at 2913.5 m (0.5 l oil and 9 l water/mud filtrate in the 2 3/4 gallon chamber).
    The well was permanently abandoned on 31 October 1984 as an oil discovery.
    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]
    180.00
    3157.50

  • 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
    2439.0
    2449.0
    [m ]
    2
    2494.5
    2498.7
    [m ]
    3
    2499.0
    2513.6
    [m ]
    4
    2902.0
    2919.7
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    46.5
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 2439-2444m
    Core photo at depth: 2444-2449m
    Core photo at depth: 2494-2498m
    Core photo at depth: 2499-2504m
    Core photo at depth: 2504-2509m
    2439-2444m
    2444-2449m
    2494-2498m
    2499-2504m
    2504-2509m
    Core photo at depth: 2509-2513m
    Core photo at depth: 2902-2907m
    Core photo at depth: 2908-2914m
    Core photo at depth: 2914-2919m
    Core photo at depth:  
    2509-2513m
    2902-2907m
    2908-2914m
    2914-2919m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2285.0
    [m]
    DC
    2297.5
    [m]
    SWC
    2307.5
    [m]
    SWC
    2327.5
    [m]
    SWC
    2347.5
    [m]
    SWC
    2367.5
    [m]
    SWC
    2387.5
    [m]
    SWC
    2407.5
    [m]
    SWC
    2427.5
    [m]
    SWC
    2447.5
    [m]
    SWC
    2467.5
    [m]
    SWC
    2477.5
    [m]
    SWC
    2507.5
    [m]
    SWC
    2537.5
    [m]
    SWC
    2567.5
    [m]
    SWC
    2597.5
    [m]
    SWC
    2627.5
    [m]
    SWC
    2657.5
    [m]
    SWC
    2687.5
    [m]
    SWC
    2717.5
    [m]
    SWC
    2747.5
    [m]
    SWC
    2777.5
    [m]
    SWC
    2797.5
    [m]
    SWC

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.33
    pdf
    15.83
    pdf
    0.73

  • 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
    21.19
    pdf
    12.35
    pdf
    2.32
    pdf
    0.16
    pdf
    1.44
    pdf
    0.26
    pdf
    0.95
    pdf
    0.41
    pdf
    0.63
    pdf
    1.45
    pdf
    1.25
    pdf
    2.88
    pdf
    1.40
    pdf
    1.88
    pdf
    1.87
    pdf
    1.49
    pdf
    2.01
    pdf
    1.18
    pdf
    3.04
    pdf
    2.12

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CDL CNL GR CAL
    1599
    3157
    CDL GR CAL
    504
    1622
    DIFL BHC AC GR SP CAL
    170
    3157
    DLL MLL GR
    1599
    3157
    FMT
    2438
    2482
    FMT
    2901
    3146
    FMT
    2911
    2913
    HR DIP
    1599
    3157
    VELOCITY
    660
    3150

  • 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
    171.0
    36
    173.0
    0.00
    LOT
    SURF.COND.
    20
    505.0
    26
    520.0
    1.44
    LOT
    INTERM.
    13 3/8
    1601.0
    17 1/2
    1620.0
    1.84
    LOT
    INTERM.
    9 5/8
    2666.0
    12 1/4
    2680.0
    1.86
    LOT
    OPEN HOLE
    3179.0
    8 1/2
    3179.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    110
    1.03
    55.0
    5.3
    WATER BASED
    17.09.1984
    171
    1.07
    49.0
    4.5
    WATER BASED
    17.09.1984
    240
    1.07
    49.0
    4.5
    WATER BASED
    17.09.1984
    520
    1.08
    46.0
    20.0
    WATER BASED
    17.09.1984
    523
    1.11
    40.0
    9.6
    WATER BASED
    19.09.1984
    772
    1.14
    42.0
    10.0
    WATER BASED
    20.09.1984
    945
    1.14
    47.0
    12.0
    WATER BASED
    21.09.1984
    1213
    1.14
    45.0
    12.0
    WATER BASED
    24.09.1984
    1491
    1.14
    49.0
    13.0
    WATER BASED
    24.09.1984
    1620
    1.14
    44.0
    12.0
    WATER BASED
    24.09.1984
    1877
    1.14
    45.0
    9.0
    WATER BASED
    28.09.1984
    2272
    1.14
    46.0
    9.0
    WATER BASED
    01.10.1984
    2374
    1.20
    44.0
    8.6
    WATER BASED
    01.10.1984
    2439
    1.25
    45.0
    9.1
    WATER BASED
    01.10.1984
    2450
    1.25
    42.0
    8.6
    WATER BASED
    02.10.1984
    2495
    1.25
    45.0
    10.0
    WATER BASED
    03.10.1984
    2511
    1.25
    43.0
    9.1
    WATER BASED
    04.10.1984
    2516
    1.25
    46.0
    9.6
    WATER BASED
    05.10.1984
    2584
    1.30
    42.0
    9.0
    WATER BASED
    08.10.1984
    2626
    1.30
    45.0
    10.0
    WATER BASED
    08.10.1984
    2680
    1.30
    47.0
    10.0
    WATER BASED
    08.10.1984
    2680
    1.30
    44.0
    5.8
    WATER BASED
    15.10.1984
    2717
    1.30
    54.0
    5.8
    WATER BASED
    15.10.1984
    2758
    1.30
    55.0
    5.8
    WATER BASED
    15.10.1984
    2803
    1.35
    55.0
    6.0
    WATER BASED
    16.10.1984
    2861
    1.35
    52.0
    6.0
    WATER BASED
    17.10.1984
    2902
    1.35
    59.0
    5.6
    WATER BASED
    18.10.1984
    2920
    1.35
    60.0
    5.6
    WATER BASED
    19.10.1984
    3034
    1.35
    56.0
    7.0
    WATER BASED
    22.10.1984
    3146
    1.35
    62.0
    6.7
    WATER BASED
    22.10.1984
    3157
    1.35
    76.0
    6.7
    WATER BASED
    23.10.1984
    3157
    1.35
    76.0
    6.7
    WATER BASED
    24.10.1984
    3157
    1.35
    61.0
    6.2
    WATER BASED
    22.10.1984

  • Pressure plots
    Pressure plots
    The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.
    Pressure plots
    Document name
    Document format
    Document size [MB]
    pdf
    0.23