Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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23.07.2024 - 01:26
Time of last synchronization with Norwegian Offshore Directorate's internal systems

7/8-4

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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.
    7/8-4
    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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    7/8-4
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    NHCN 82-119-SP. 386+NHCN 82-309-SP. 1095
    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.
    Conoco Norway Inc.
    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.
    446-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.
    72
    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,
    11.12.1984
    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.
    20.02.1985
    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.
    20.02.1987
    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.
    19.10.2006
    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.
    25.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    82.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4400.0
    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).
    4398.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    3.2
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    160
    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.
    SMITH BANK FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    57° 15' 28.03'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 25' 46.23'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6346368.89
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    465582.36
    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.
    448
  • Wellbore history

    General
    Wildcat well 7/8-4 was drilled on the northern flank of the Central Graben. The prospect was a structural/stratigraphic trap situated on the north flank of a high standing Triassic fault block. The objective was to test the hydrocarbon potential of a prognosed Late Jurassic sand body at 3840 m. Isolated sands within the Triassic were also postulated as hydrocarbon traps and potential secondary targets.
    Operations and results
    Well 7/8-4 was spudded with the semi-submersible installation Nortrym on 11 December 1984 and drilled to TD at 4400 m in Early Triassic sandstones and shales of the Smith Bank Formation. The overall operation took 72 days from spud. Problems with gumbo and keeping the hole clean were experienced. A weighted KCl polymer mud was used to keep the hole open and prevent shale spalling. From 4192 m onwards, problems of tight hole was experienced with the drill string becoming permanently stuck at 4400 m. Differential sticking was thought to be the problems, so the mud weight was reduced to compensate for this. While attempting to free the pipe the well started to flow but this was quickly stopped by raising the mud weight. While pulling out of the hole the drill pipe got stuck with the bit at 4382 m. The pipe was unscrewed at 4250 m and during fishing operations two more sections of pipe were lost in the hole, one with the top at 4192 m, the other at 4183 m. The operator then decided on a sidetrack, and the hole was cemented back to 4130 m and a sidetrack was kicked off from 4140 m. Eleven days were lost due to the plug back and sidetrack operation. The well was drilled with seawater down to 619 m and with KCl polymer mud from 619 m to TD.
    Two cores were cut from 3825.5 m to 3859 m in what was believed to be the Ula sandstone of the Late Jurassic, the primary objective. Subsequent analysis revealed the Lower Cretaceous to unconformably overlie Middle Triassic formations with no Jurassic rocks present at this location. Hence, the cored section was in the upper Smith Bank Formation. No hydrocarbon indications were registered in the well. No pressure or fluid samples were taken on wire line.
    The well was permanently abandoned on 20 February 1985 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]
    200.00
    4397.00
  • 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
    3825.0
    3831.3
    [m ]
    2
    3831.5
    3859.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    33.8
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 3823-3831m
    Core photo at depth: 3823-3831m
    Core photo at depth: 3823-3831m
    Core photo at depth: 3823-3831m
    Core photo at depth: 3823-3831m
    3823-3831m
    3823-3831m
    3823-3831m
    3823-3831m
    3823-3831m
    Core photo at depth: 3823-3831m
    Core photo at depth: 3823-3831m
    Core photo at depth: 3823-3831m
    Core photo at depth: 3823-3831m
    Core photo at depth: 3823-3831m
    3823-3831m
    3823-3831m
    3823-3831m
    3823-3831m
    3823-3831m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth: 3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    3831-3839m
    Core photo at depth: 3831-3839m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3831-3839m
  • Palynological slides at the Norwegian Offshore Directorate

    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    3701.0
    [m]
    DC
    OD
    3710.0
    [m]
    DC
    OD
    3719.0
    [m]
    DC
    OD
    3728.0
    [m]
    DC
    OD
    3740.0
    [m]
    DC
    OD
    3749.0
    [m]
    DC
    OD
    3758.0
    [m]
    DC
    OD
    3770.0
    [m]
    DC
    OD
    3806.0
    [m]
    DC
    OD
    3809.0
    [m]
    DC
    OD
    3812.0
    [m]
    DC
    OD
    3815.0
    [m]
    DC
    OD
    3818.0
    [m]
    DC
    OD
    3821.0
    [m]
    DC
    OD
    3827.0
    [m]
    C
    OD
    3828.1
    [m]
    C
    OD
    3829.5
    [m]
    C
    OD
    3830.1
    [m]
    C
    OD
    3832.4
    [m]
    C
    OD
    3854.9
    [m]
    C
    OD
  • Lithostratigraphy

  • Composite logs

    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.98
  • Geochemical information

    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.88
  • 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
    7.74
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CST
    3799
    4014
    ISF LSS GR MSFL SP
    203
    613
    ISF LSS GR MSFL SP LDT CNL GR
    606
    1957
    ISF LSS MSFL GR CAL LDT CNL GR C
    1946
    3813
    ISF LSS MSFL LDT CNL SHDT GR
    3795
    4405
    MWD GR RES DIR
    649
    4397
    TEMPERATURE
    107
    3694
    TEMPERATURE
    107
    1917
    VSP
    250
    4400
  • 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
    204.0
    36
    205.0
    0.00
    LOT
    SURF.COND.
    20
    607.0
    26
    619.0
    1.67
    LOT
    INTERM.
    13 3/8
    1946.0
    17 1/2
    1970.0
    1.93
    LOT
    INTERM.
    9 5/8
    3796.0
    12 1/4
    3808.0
    2.23
    LOT
    OPEN HOLE
    4400.0
    8 1/2
    4400.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    175
    1.07
    WATER BASED
    11.12.1984
    205
    1.07
    WATER BASED
    12.12.1984
    619
    1.13
    WATER BASED
    17.12.1984
    619
    0.00
    17.0
    105.3
    WATER BASED
    15.12.1984
    619
    1.09
    17.0
    105.3
    WATER BASED
    16.12.1984
    830
    1.19
    20.0
    114.7
    WATER BASED
    19.12.1984
    830
    1.19
    20.0
    114.7
    WATER BASED
    18.12.1984
    1241
    1.39
    25.0
    114.7
    WATER BASED
    20.12.1984
    1534
    1.50
    27.0
    100.5
    WATER BASED
    20.12.1984
    1694
    1.50
    30.0
    95.8
    WATER BASED
    26.12.1984
    1915
    1.50
    32.0
    301.6
    WATER BASED
    26.12.1984
    1963
    1.57
    23.0
    110.1
    WATER BASED
    27.12.1984
    1963
    1.61
    27.0
    95.8
    WATER BASED
    27.12.1984
    1963
    1.61
    27.0
    95.8
    WATER BASED
    27.12.1984
    1970
    1.60
    23.0
    95.8
    WATER BASED
    14.12.1984
    2119
    1.54
    28.0
    81.4
    WATER BASED
    14.12.1984
    2194
    1.48
    30.0
    86.2
    WATER BASED
    14.12.1984
    2293
    1.48
    30.0
    95.8
    WATER BASED
    14.12.1984
    2354
    1.48
    34.0
    105.3
    WATER BASED
    14.12.1984
    2592
    1.48
    29.0
    91.0
    WATER BASED
    15.12.1984
    2642
    1.48
    33.0
    105.3
    WATER BASED
    30.12.1984
    2919
    1.48
    24.0
    95.8
    WATER BASED
    25.12.1984
    2994
    1.48
    22.0
    110.1
    WATER BASED
    25.12.1984
    3105
    1.48
    21.0
    100.5
    WATER BASED
    25.12.1984
    3128
    1.47
    26.0
    134.1
    WATER BASED
    02.01.1985
    3196
    1.48
    26.0
    110.1
    WATER BASED
    04.01.1985
    3254
    1.48
    24.0
    129.2
    WATER BASED
    07.01.1985
    3342
    1.48
    25.0
    110.1
    WATER BASED
    14.01.1985
    3424
    1.48
    22.0
    119.7
    WATER BASED
    14.01.1985
    3438
    1.48
    23.0
    100.0
    WATER BASED
    14.01.1985
    3453
    1.48
    22.0
    129.3
    WATER BASED
    14.01.1985
    3559
    1.48
    25.0
    119.7
    WATER BASED
    15.01.1985
    3571
    1.44
    27.0
    110.1
    WATER BASED
    16.01.1985
    3617
    1.54
    27.0
    119.7
    WATER BASED
    17.01.1985
    3660
    1.54
    27.0
    119.7
    WATER BASED
    17.01.1985
    3684
    1.54
    25.0
    124.5
    WATER BASED
    21.01.1985
    3783
    1.71
    53.0
    81.0
    WATER BASED
    16.02.1985
    3808
    1.54
    36.0
    134.0
    WATER BASED
    24.01.1985
    3826
    1.74
    38.0
    143.6
    WATER BASED
    28.01.1985
    3857
    1.74
    33.0
    114.9
    WATER BASED
    28.01.1985
    3859
    1.74
    34.0
    124.5
    WATER BASED
    27.01.1985
    3911
    1.74
    26.0
    148.4
    WATER BASED
    29.01.1985
    3943
    1.74
    38.0
    114.9
    WATER BASED
    30.01.1985
    4092
    1.74
    360.0
    110.1
    WATER BASED
    31.01.1985
    4092
    1.74
    36.0
    110.1
    WATER BASED
    31.01.1985
    4092
    1.74
    360.0
    110.1
    WATER BASED
    31.01.1985
    4130
    1.72
    33.0
    72.0
    WATER BASED
    10.02.1985
    4140
    1.71
    32.0
    71.8
    WATER BASED
    11.02.1985
    4192
    1.74
    31.0
    100.5
    WATER BASED
    31.01.1985
    4192
    1.69
    30.0
    110.1
    WATER BASED
    31.01.1985
    4192
    1.74
    31.0
    100.5
    WATER BASED
    31.01.1985
    4192
    1.69
    30.0
    110.1
    WATER BASED
    31.01.1985
    4347
    1.68
    31.0
    81.4
    WATER BASED
    31.01.1985
    4400
    1.67
    28.0
    67.0
    WATER BASED
    02.02.1985
    4400
    1.69
    28.0
    57.4
    WATER BASED
    06.02.1985
    4400
    1.71
    31.0
    62.0
    WATER BASED
    07.02.1985
    4400
    1.69
    28.0
    57.4
    WATER BASED
    06.02.1985
    4400
    1.66
    28.0
    48.0
    WATER BASED
    05.02.1985
    4400
    1.71
    31.0
    62.0
    WATER BASED
    07.02.1985
    4400
    1.71
    38.0
    86.2
    WATER BASED
    16.02.1985
    4400
    1.66
    28.0
    48.0
    WATER BASED
    05.02.1985