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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26/4-1

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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.
    26/4-1
    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
    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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    26/4-1
    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.
    BP Norway Limited U.A.
    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.
    545-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.
    71
    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,
    08.05.1987
    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.
    17.07.1987
    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.
    17.07.1989
    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.
    01.01.2004
    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
    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.
    23.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    121.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3690.0
    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).
    3687.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    7.8
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    128
    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.
    59° 36' 37.84'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 1' 13.26'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6608189.83
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    501148.45
    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.
    1046

  • Wellbore history
    General
    Well 26/4-1 was the first well drilled in the Stord Basin. The well was designed to test a Paleocene mound, and sandstones of Jurassic age within a footwall closure. The Paleocene sandstone was prognosed to come in at 2268 m. Another primary objective was to gain information on reservoir quality and hydrocarbon source. A secondary target was the Sleipner Formation prognosed at 2783 m. Prognosed TD was 3500 m MSL.
    Operations and results
    Wildcat well 26/4-1 was spudded with Wi1h. Wilhelmsen semi-submersible installation Treasure Scout on 8 may 1987 and completed 17 July 1987 at a depth of 3690 m in Triassic Hegre Group. Drilling proceeded without significant problems, except for several occurrences of lost circulation due to increasing formation pressure in Tertiary rocks. The well was drilled with seawater and bentonite down to 236 m, with seawater / bentonite /PAC from 236 m to 723 m, with KCl / Polymer mud from 723 m to 2680 m, and with seawater / polymer from 2680 to TD.
    The Paleocene Mound (Ty Formation sand) came in at 2246 m. Pressure measurements taken 7 m into the mounds displayed normal pressure conditions, and the sandstone proved to be water bearing. The Jurassic Draupne Formation came in at 2637 m with a total thickness of 88 m. An extremely radioactive layer was found between 2688 and 2693 m. The Sleipner Formation sandstone came in at 2820 m. Top Statfjord Formation came in at 3308 m. Sands in Jurassic (Hugin and Statfjord Formations) displayed a very slow white cut fluorescence and traces of oil on cores, but were otherwise found dry. Post well geochemical analyses revealed very good source rock intervals in the Draupne Formation (oil prone) and the Statfjord Formation (oil and gas prone). Draupne shale and Sleipner coal are immature with Vitrinite reflectance around 0.5 %Ro, while the Statfjord coals may be marginally mature with Vitrinite reflectance around 0.6 %Ro and Tmax approaching 450 °C.
    Four cores were cut in the intervals: 2253 m to 2265.7 m (Ty Formation), 2270 m to 2297.7 (Ty Formation), 2754 m to 2781.68 m (Hugin Formation), and 3308 m to 3316.85 m (Statfjord Formation). Wire line RFT fluid samples were taken at 2247 m, 2302 m, 2771 m, and 3314.1 m, but none were reported to contain hydrocarbons.
    The well was plugged and abandoned as a dry hole with weak shows.
    Testing
    No drill stem test was performed

  • Cuttings at the Norwegian Offshore Directorate
    Cuttings at the Norwegian Offshore Directorate
    Cuttings available for sampling?
    NO
    Cuttings at the Norwegian Offshore Directorate
    Cutting sample, top depth [m]
    Cutting samples, bottom depth [m]
    730.00
    3589.00

  • 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
    2253.0
    2265.7
    [m ]
    2
    2270.0
    2297.7
    [m ]
    3
    2754.0
    2781.7
    [m ]
    4
    3308.0
    3316.9
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    76.9
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 2253-2258m
    Core photo at depth: 2258-2263m
    Core photo at depth: 2263-2265m
    Core photo at depth: 2270-2275m
    Core photo at depth: 2275-2280m
    2253-2258m
    2258-2263m
    2263-2265m
    2270-2275m
    2275-2280m
    Core photo at depth: 2280-2285m
    Core photo at depth: 2285-2290m
    Core photo at depth: 2290-2295m
    Core photo at depth: 2754-2759m
    Core photo at depth: 2295-2297m
    2280-2285m
    2285-2290m
    2290-2295m
    2754-2759m
    2295-2297m
    Core photo at depth: 2759-2764m
    Core photo at depth: 2764-2769m
    Core photo at depth: 2769-2774m
    Core photo at depth: 2774-2779m
    Core photo at depth: 2779-2781m
    2759-2764m
    2764-2769m
    2769-2774m
    2774-2779m
    2779-2781m
    Core photo at depth: 3308-3313m
    Core photo at depth: 3313-3316m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3308-3313m
    3313-3316m

  • 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
    SURF.COND.
    20
    711.0
    26
    873.0
    0.00
    LOT
    INTERM.
    13 3/8
    1675.0
    17 1/2
    1680.0
    0.00
    LOT
    INTERM.
    8 3/8
    2667.0
    12 1/4
    2681.0
    0.00
    LOT
    OPEN HOLE
    3690.0
    8 1/2
    3690.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    BGL GR
    711
    1680
    CST
    2672
    3675
    CST GR
    1675
    2653
    CST GR
    1675
    2663
    DIS GR BHC
    1675
    2665
    DIS GR BHC CBL VDL
    2668
    3685
    DIS LSS GR SP
    711
    1680
    LDL CNL GR
    1680
    1935
    LDL CNL GR
    1924
    2663
    LDL CNL GR
    2668
    3679
    MWD LWD
    235
    3690
    RFT
    2766
    3571
    RFT GR
    1683
    2249
    RFT GR
    1713
    2406
    SHDT
    1675
    2665
    SHDT
    2668
    3685
    VSP
    712
    3683

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.48

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.77
    pdf
    0.61

  • 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
    2.44
    pdf
    21.70

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    190
    1.22
    8.1
    WATER BASED
    17.07.1987
    190
    0.00
    WATER BASED
    20.07.1987
    1532
    1.35
    53.0
    13.9
    WATER BASED
    27.05.1987
    1602
    1.45
    58.0
    15.4
    WATER BASED
    27.05.1987
    1640
    1.51
    55.0
    13.9
    WATER BASED
    27.05.1987
    1680
    1.62
    54.0
    11.5
    WATER BASED
    27.05.1987
    1680
    1.62
    54.0
    12.5
    WATER BASED
    27.05.1987
    1680
    1.62
    58.0
    13.0
    WATER BASED
    27.05.1987
    1683
    1.62
    48.0
    11.0
    WATER BASED
    29.05.1987
    1722
    1.62
    41.0
    8.6
    WATER BASED
    29.05.1987
    1951
    1.68
    57.0
    11.5
    WATER BASED
    01.06.1987
    2048
    1.07
    50.0
    8.2
    WATER BASED
    01.06.1987
    2058
    1.66
    44.0
    7.7
    WATER BASED
    01.06.1987
    2067
    1.63
    54.0
    10.6
    WATER BASED
    03.06.1987
    2077
    1.63
    72.0
    15.4
    WATER BASED
    03.06.1987
    2077
    0.00
    3.0
    13.4
    WATER BASED
    05.06.1987
    2077
    1.63
    12.5
    WATER BASED
    04.06.1987
    2082
    1.92
    WATER BASED
    10.06.1987
    2108
    1.60
    4.0
    13.0
    WATER BASED
    10.06.1987
    2177
    1.92
    15.4
    WATER BASED
    10.06.1987
    2238
    1.58
    4.0
    15.8
    WATER BASED
    10.06.1987
    2252
    1.58
    5.0
    17.3
    WATER BASED
    10.06.1987
    2253
    1.35
    13.4
    WATER BASED
    11.06.1987
    2270
    1.30
    11.0
    WATER BASED
    12.06.1987
    2294
    1.30
    13.9
    WATER BASED
    15.06.1987
    2294
    1.30
    13.0
    WATER BASED
    15.06.1987
    2370
    1.30
    13.9
    WATER BASED
    15.06.1987
    2448
    1.30
    47.0
    12.0
    WATER BASED
    16.06.1987
    2527
    1.30
    12.0
    WATER BASED
    17.06.1987
    2563
    1.21
    7.7
    WATER BASED
    17.07.1987
    2603
    1.30
    42.0
    10.6
    WATER BASED
    18.06.1987
    2680
    1.30
    41.0
    10.6
    WATER BASED
    19.06.1987
    2680
    1.33
    42.0
    10.6
    WATER BASED
    23.06.1987
    2680
    1.33
    40.0
    10.1
    WATER BASED
    24.06.1987
    2680
    1.33
    41.0
    10.6
    WATER BASED
    23.06.1987
    2681
    1.20
    39.0
    10.1
    WATER BASED
    24.06.1987
    2738
    1.20
    30.0
    7.2
    WATER BASED
    25.06.1987
    2781
    1.20
    37.0
    9.1
    WATER BASED
    26.06.1987
    2898
    1.20
    27.0
    8.2
    WATER BASED
    30.06.1987
    3003
    1.20
    39.0
    8.6
    WATER BASED
    30.06.1987
    3106
    1.20
    36.0
    7.7
    WATER BASED
    30.06.1987
    3227
    1.20
    36.0
    7.7
    WATER BASED
    30.06.1987
    3270
    1.20
    37.0
    8.2
    WATER BASED
    01.07.1987
    3308
    1.88
    8.2
    WATER BASED
    02.07.1987
    3308
    1.15
    8.2
    WATER BASED
    03.07.1987
    3308
    1.15
    19.0
    80.6
    WATER BASED
    06.07.1987
    3320
    1.15
    8.6
    WATER BASED
    06.07.1987
    3427
    1.15
    7.7
    WATER BASED
    06.07.1987
    3542
    1.15
    18.0
    WATER BASED
    07.07.1987
    3624
    1.17
    8.2
    WATER BASED
    13.07.1987
    3667
    1.17
    7.7
    WATER BASED
    13.07.1987
    3690
    1.17
    9.1
    WATER BASED
    13.07.1987
    3690
    1.20
    8.2
    WATER BASED
    13.07.1987
    3690
    1.17
    9.1
    WATER BASED
    13.07.1987
    3690
    1.20
    9.1
    WATER BASED
    14.07.1987
    3690
    1.21
    9.1
    WATER BASED
    14.07.1987
    3690
    1.21
    8.2
    WATER BASED
    15.07.1987

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1600.0
    [m]
    DC
    BP
    1640.0
    [m]
    DC
    BP
    1680.0
    [m]
    DC
    BP
    1710.0
    [m]
    SWC
    BP
    1736.0
    [m]
    SWC
    BP
    1780.0
    [m]
    DC
    BP
    1820.0
    [m]
    DC
    BP
    1860.0
    [m]
    DC
    BP
    1900.0
    [m]
    DC
    BP
    1940.0
    [m]
    DC
    BP
    2000.0
    [m]
    DC
    BP
    2033.0
    [m]
    DC
    BP
    2047.0
    [m]
    SWC
    BP
    2051.0
    [m]
    DC
    BP
    2069.0
    [m]
    DC
    BP
    2090.0
    [m]
    DC
    BP
    2102.0
    [m]
    SWC
    BP
    2105.0
    [m]
    DC
    BP
    2126.0
    [m]
    DC
    BP
    2141.0
    [m]
    SWC
    BP
    2150.0
    [m]
    DC
    BP
    2189.0
    [m]
    DC
    BP
    2210.0
    [m]
    DC
    BP
    2222.0
    [m]
    DC
    BP
    2243.0
    [m]
    DC
    BP
    2252.0
    [m]
    DC
    BP
    2260.8
    [m]
    C
    BP
    2262.0
    [m]
    C
    BP
    2640.0
    [m]
    DC
    BP
    2678.0
    [m]
    SWC
    BP
    2704.0
    [m]
    DC
    BP
    2707.0
    [m]
    SWC
    BP
    2725.0
    [m]
    SWC
    BP
    2733.0
    [m]
    SWC
    BP
    2750.0
    [m]
    SWC
    BP
    2764.6
    [m]
    C
    BP
    2765.0
    [m]
    C
    BP
    2785.0
    [m]
    DC
    BP
    2821.0
    [m]
    DC
    BP
    2854.0
    [m]
    DC
    BP
    2878.0
    [m]
    DC
    BP
    2900.0
    [m]
    SWC
    BP
    2941.0
    [m]
    DC
    BP
    2980.0
    [m]
    DC
    BP
    3019.0
    [m]
    DC
    BP
    3064.0
    [m]
    DC
    BP
    3100.0
    [m]
    DC
    BP
    3150.0
    [m]
    SWC
    BP
    3190.0
    [m]
    DC
    BP
    3220.0
    [m]
    DC
    BP
    3250.0
    [m]
    SWC
    BP
    3295.0
    [m]
    DC
    BP
    3311.7
    [m]
    C
    BP
    3314.6
    [m]
    C
    BP
    3340.0
    [m]
    DC
    BP
    3382.0
    [m]
    DC
    BP
    3424.0
    [m]
    DC
    BP
    3466.0
    [m]
    DC
    BP
    3508.0
    [m]
    DC
    BP
    3550.0
    [m]
    DC
    BP
    3592.0
    [m]
    DC
    BP
    3647.0
    [m]
    SWC
    BP
    3665.0
    [m]
    SWC
    BP
    3675.0
    [m]
    SWC
    BP
    3691.0
    [m]
    SWC
    BP