Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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27.12.2024 - 01:25
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7/4-1

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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.
    7/4-1
    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
    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.
    7/4-1
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    ST 9216-403 X-OVER NOD6-86-041
    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.
    763-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.
    48
    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,
    05.07.1993
    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.
    21.08.1993
    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.
    21.08.1995
    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.
    31.10.2003
    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.
    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.
    23.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    82.5
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3133.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    2.2
    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.
    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.
    57° 44' 11.92'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 11' 38.95'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6399820.83
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    452016.11
    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.
    2136

  • Wellbore history
    General
    Well 7/4-1 was drilled on a structure lying on the northeastern flank of the Central Graben. The main objectives for the well were to test commercial reserves of hydrocarbons in the Upper Jurassic of the Alpha prospect and to establish the "Jæren High" Model analogy proven by the 7/7-2 discovery well.
    Operations and results
    Exploration well 7/4-1 was spudded with the semi-submersible installation "Deepsea Bergen" on 5 July1993 and drilled to TD at 3133 m, 50 m into rocks of the Permian Zechstein Group anhydrite. The well was drilled with seawater and viscous pills down to 926 m and with KCl / polymer / glycol mud from 926 m to TD.
    Seventeen m of Late Jurassic sandstones were penetrated. No hydrocarbons were observed. Three cores were cut; one in the interval 2980 m ?2989 m in the Mandal Formation, the second in the interval 3015 m ? 3024 m in the Farsund Formation, and the third in the interval 3069 m - 3077 m in the Gyda Sandstone Member. No fluid samples were taken. The well was permanently abandoned as a dry well on 22 August 1993.
    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]
    930.00
    3132.00

  • 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
    2980.0
    2988.6
    [m ]
    2
    3015.0
    3023.6
    [m ]
    3
    3069.0
    3076.4
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    24.6
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 2980-2985m
    Core photo at depth: 2985-2988m
    Core photo at depth: 3015-3020m
    Core photo at depth: 3020-3023m
    Core photo at depth: 3069-3074m
    2980-2985m
    2985-2988m
    3015-3020m
    3020-3023m
    3069-3074m
    Core photo at depth: 3074-3076m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3074-3076m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1310.0
    [m]
    DC
    MILL
    1330.0
    [m]
    DC
    MILL
    1350.0
    [m]
    DC
    MILL
    1370.0
    [m]
    DC
    MILL
    1390.0
    [m]
    DC
    MILL
    1410.0
    [m]
    DC
    MILL
    1430.0
    [m]
    DC
    MILL
    1450.0
    [m]
    DC
    MILL
    1470.0
    [m]
    DC
    MILL
    1490.0
    [m]
    DC
    MILL
    1510.0
    [m]
    DC
    MILL
    1530.0
    [m]
    DC
    MILL
    1550.0
    [m]
    DC
    MILL
    1570.0
    [m]
    DC
    MILL
    1590.0
    [m]
    DC
    MILL
    1610.0
    [m]
    DC
    MILL
    1630.0
    [m]
    DC
    MILL
    1650.0
    [m]
    DC
    MILL
    1670.0
    [m]
    DC
    MILL
    1690.0
    [m]
    DC
    MILL
    1710.0
    [m]
    DC
    MILL
    1730.0
    [m]
    DC
    MILL
    1750.0
    [m]
    DC
    MILL
    1770.0
    [m]
    DC
    MILL
    1790.0
    [m]
    DC
    MILL
    1810.0
    [m]
    DC
    MILL
    1830.0
    [m]
    DC
    MILL
    1850.0
    [m]
    DC
    MILL
    1870.0
    [m]
    DC
    MILL
    1890.0
    [m]
    DC
    MILL
    1910.0
    [m]
    DC
    MILL
    1920.0
    [m]
    DC
    MILL
    1930.0
    [m]
    DC
    MILL
    1945.0
    [m]
    DC
    MILL
    1960.0
    [m]
    DC
    MILL
    1975.0
    [m]
    DC
    MILL
    1990.0
    [m]
    DC
    MILL
    2005.0
    [m]
    DC
    MILL
    2020.0
    [m]
    DC
    MILL
    2035.0
    [m]
    DC
    MILL
    2050.0
    [m]
    DC
    MILL
    2065.0
    [m]
    DC
    MILL
    2085.0
    [m]
    DC
    MILL
    2100.0
    [m]
    DC
    MILL
    2115.0
    [m]
    DC
    MILL
    2130.0
    [m]
    DC
    MILL
    2145.0
    [m]
    DC
    MILL
    2160.0
    [m]
    DC
    MILL
    2188.8
    [m]
    SWC
    STATO
    2200.0
    [m]
    DC
    MILL
    2214.8
    [m]
    SWC
    STATO
    2228.0
    [m]
    SWC
    STATO
    2247.0
    [m]
    SWC
    STATO
    2265.6
    [m]
    SWC
    STATO
    2282.9
    [m]
    SWC
    STATO
    2296.0
    [m]
    SWC
    STATO
    2315.4
    [m]
    SWC
    STATO
    2330.0
    [m]
    DC
    STATO
    2355.9
    [m]
    SWC
    STATO
    2853.0
    [m]
    DC
    MILL
    2883.0
    [m]
    DC
    MILL
    2937.0
    [m]
    DC
    MILL
    2974.2
    [m]
    SWC
    STATO
    2980.1
    [m]
    C
    STATO
    2984.5
    [m]
    C
    STATO
    2988.5
    [m]
    C
    STATO
    3000.0
    [m]
    DC
    MILL
    3003.0
    [m]
    DC
    MILL
    3006.0
    [m]
    DC
    MILL
    3009.0
    [m]
    DC
    MILL
    3011.7
    [m]
    SWC
    STATO
    3015.0
    [m]
    C
    STATO
    3019.5
    [m]
    C
    STATO
    3023.5
    [m]
    C
    STATO
    3027.0
    [m]
    DC
    MILL
    3030.0
    [m]
    DC
    MILL
    3033.0
    [m]
    DC
    MILL
    3036.0
    [m]
    DC
    MILL
    3042.0
    [m]
    DC
    MILL
    3045.0
    [m]
    DC
    MILL
    3048.0
    [m]
    DC
    MILL
    3051.0
    [m]
    DC
    MILL
    3054.0
    [m]
    DC
    MILL
    3057.7
    [m]
    SWC
    STATO
    3060.7
    [m]
    SWC
    STATO
    3064.2
    [m]
    SWC
    STATO
    3066.0
    [m]
    DC
    MILL
    3070.1
    [m]
    C
    STATO
    3074.5
    [m]
    C
    STATO
    3078.0
    [m]
    DC
    MILL
    3081.0
    [m]
    DC
    MILL
    3084.0
    [m]
    DC
    MILL

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.32

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.42
    pdf
    1.01

  • 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
    9.19

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    DIFL ACL ZDL GR
    905
    2460
    DIFL ACL ZDL GR CBL
    2445
    2983
    DIFL ACL ZDL GR CN CBL
    2969
    3111
    DIPS GR
    2825
    2979
    DIPS GR
    2969
    3130
    FMT GR
    3069
    3072
    MWD
    105
    3133
    SWC GR
    2052
    2360
    SWC GR
    2837
    2979
    SWC GR
    2974
    3126
    VSP
    1480
    3130

  • 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
    167.0
    36
    167.0
    0.00
    LOT
    INTERM.
    20
    900.0
    26
    901.0
    2.00
    LOT
    INTERM.
    13 3/8
    2445.0
    17 1/2
    2447.0
    2.00
    LOT
    INTERM.
    9 7/8
    2970.0
    12 1/4
    2972.0
    2.08
    LOT
    OPEN HOLE
    3133.0
    8 1/2
    3133.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    367
    1.03
    16.0
    DUMMY
    775
    1.03
    16.0
    DUMMY
    920
    1.03
    DUMMY
    1110
    1.50
    40.0
    WATER BASED
    1830
    1.64
    46.0
    WATER BASED
    2200
    1.64
    36.0
    WATER BASED
    2215
    1.64
    57.0
    WATER BASED
    2314
    1.64
    54.0
    WATER BASED
    2431
    1.64
    49.0
    WATER BASED
    2460
    1.64
    35.0
    WATER BASED
    2567
    1.64
    32.0
    WATER BASED
    2817
    1.71
    32.0
    WATER BASED
    2950
    1.74
    34.0
    WATER BASED
    2980
    1.74
    42.0
    WATER BASED
    2989
    1.74
    34.0
    WATER BASED
    3069
    1.85
    50.0
    WATER BASED
    3077
    1.89
    46.0
    WATER BASED

  • 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
    0.21