Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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24.11.2024 - 01:27
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35/8-3

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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.
    35/8-3
    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
    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.
    35/8-3
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    LINJE 79 - 2 - 30 SP 590
    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.
    Norwegian Gulf Exploration Company AS
    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.
    580-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.
    102
    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,
    06.07.1988
    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.
    15.10.1988
    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.
    15.10.1990
    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.
    01.08.2010
    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.
    GAS
    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.
    LATE 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.
    INTRA HEATHER FM SS
    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.
    373.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3944.0
    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).
    3944.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    12.9
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    141
    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.
    MIDDLE JURASSIC
    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.
    RANNOCH FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    61° 21' 5.35'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 32' 2.63'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6802217.37
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    528566.79
    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.
    1288

  • Wellbore history
    General
    Well 35/8-3 was drilled in the southern end of the Sogn Graben in the Northern North Sea. The primary objective was to assess the hydrocarbon potential of the Brent Group sandstones, which flowed gas-condensate in wells 35/8-1 and 35/8-2. The Brent Group was expected to be 212 m thick and to be encountered at a depth of 3631 m subsea. Secondary objectives were Late Jurassic Intra-Heather Formation sandstones, and possible Intra-Early Cretaceous sandstones.
    Operations and results
    Wildcat well 35/8-3 was spudded with the semi-submersible installation Treasure Scout on 6 July 1988 and drilled to TD at 3944 m (3947 m logger's depth) in the Middle Jurassic Brent Group. No shallow gas was observed. While drilling the 12 1/4" section the drill string got stuck in Heather sands at 3539 m. After 7 days unsuccessful fishing the hole was plugged back to 3308 m. It was sidetracked from 3371 m and drilled to section TD at 3560 m. The BHA got stuck a second time at 3863 m in the 8 1/2" section. After 5 days with several fishing attempts by jarring the BHA was fished after spotting a diesel based fluid. The diesel was circulated out and the well was drilled to its final TD. The well was drilled with spud mud down to 830 m, with Drispac and seawater from 830 m to 2174 m, and with KCl/polymer mud from 2174 m to TD.
    Hydrocarbon indications while drilling were minor except in the Late Jurassic Heather sands. Log analyses of the Heather sands indicated a probable gross gas column of 70 m with a net pay of 31.9 m. Average porosity in the net sand was 15.6% with an estimated average water saturation of 22%. An RFT pressure-depth plot confirmed a gas column with an estimated 0.162 psi/ft (3.66 KPa/m) pressure gradient. No gas/water contact was apparent. Shows were encountered while drilling the Brent Group sands, but analyses of wire line logs and RFT's indicated the interval was water bearing. No reservoir rocks were encountered in the Early Cretaceous age formations.
    One conventional core was cut from 3830 to 3848.4 m. Recovery was 100% and consisted of sands and shales of the Ness Formation, Brent Group. Two RFT fluid samples were taken at 3467 m (0.04 Sm2 gas and 10 litres mud filtrate with trace of oil), and at 3859.5 m (10 litres mud filtrate and formation water, no gas or oil).
    The well was permanently abandoned on 15 October 1988 as a gas 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]
    840.00
    3944.00

  • 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
    3830.0
    3848.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    18.0
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3830-3835m
    Core photo at depth: 3835-3840m
    Core photo at depth: 3840-3845m
    Core photo at depth: 3845-3848m
    Core photo at depth:  
    3830-3835m
    3835-3840m
    3840-3845m
    3845-3848m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2730.0
    [m]
    DC
    RRI
    2745.0
    [m]
    DC
    RRI
    2760.0
    [m]
    DC
    RRI
    2775.0
    [m]
    DC
    RRI
    2790.0
    [m]
    DC
    RRI
    2805.0
    [m]
    DC
    RRI
    2824.0
    [m]
    DC
    RRI
    2840.0
    [m]
    DC
    RRI
    2857.0
    [m]
    DC
    RRI
    2875.0
    [m]
    DC
    RRI
    2890.0
    [m]
    DC
    RRI
    2905.0
    [m]
    DC
    RRI
    2926.0
    [m]
    DC
    RRI
    2941.0
    [m]
    DC
    RRI
    2959.0
    [m]
    DC
    RRI
    2978.0
    [m]
    DC
    RRI
    3002.0
    [m]
    DC
    RRI
    3018.0
    [m]
    DC
    RRI
    3034.0
    [m]
    DC
    RRI
    3048.0
    [m]
    DC
    RRI
    3146.0
    [m]
    DC
    RRI
    3176.0
    [m]
    DC
    RRI
    3206.0
    [m]
    DC
    RRI
    3236.0
    [m]
    DC
    RRI
    3266.0
    [m]
    DC
    RRI
    3294.0
    [m]
    DC
    RRI

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.48
    pdf
    1.18
    pdf
    1.57

  • 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
    22.26

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CST GR
    2180
    3557
    CST GR
    3575
    3942
    DIS LSS GR SP
    2160
    3560
    DIS LSS GR SP CAL
    819
    2141
    DLL MAFL GR SP
    3300
    3556
    DLL MSFL GR SP CAL
    3545
    3941
    LDL CNL GR CAL
    2160
    3561
    LDL CNL GR CAL
    3545
    3946
    LSS GR
    3545
    3943
    RFT GR
    3814
    3946
    RFT HP GR
    3441
    3467
    SHDT
    3545
    3946
    VSP
    500
    3945

  • 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
    531.0
    36
    845.0
    0.00
    LOT
    SURF.COND.
    20
    818.5
    26
    1022.0
    1.42
    LOT
    INTERM.
    13 3/8
    2159.5
    17 1/2
    2174.0
    1.65
    LOT
    INTERM.
    9 5/8
    3545.5
    12 1/4
    3560.0
    1.84
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    440
    1.32
    13.0
    4.0
    WATER BASED
    12.10.1988
    440
    1.32
    11.0
    3.0
    WATER BASED
    13.10.1988
    685
    0.00
    WATER BASED
    15.08.1988
    845
    0.00
    WATER BASED
    16.08.1988
    1150
    1.14
    15.0
    6.2
    WATER BASED
    19.08.1988
    1205
    1.14
    14.0
    6.2
    WATER BASED
    19.08.1988
    1474
    1.14
    14.0
    6.2
    WATER BASED
    19.08.1988
    1786
    1.15
    15.0
    5.7
    WATER BASED
    19.08.1988
    1862
    1.18
    16.0
    5.2
    WATER BASED
    19.08.1988
    1974
    1.18
    15.0
    6.2
    WATER BASED
    19.08.1988
    2023
    1.32
    13.0
    8.0
    WATER BASED
    11.10.1988
    2043
    1.32
    13.0
    8.0
    WATER BASED
    10.10.1988
    2148
    1.18
    14.0
    5.7
    WATER BASED
    19.08.1988
    2174
    1.18
    14.0
    3.8
    WATER BASED
    19.08.1988
    2174
    1.18
    13.0
    3.3
    WATER BASED
    19.08.1988
    2174
    1.18
    14.0
    5.7
    WATER BASED
    19.08.1988
    2271
    1.18
    14.0
    5.7
    WATER BASED
    19.08.1988
    2320
    1.18
    12.0
    4.8
    WATER BASED
    19.08.1988
    2474
    1.20
    10.0
    4.8
    WATER BASED
    19.08.1988
    2500
    1.32
    13.0
    8.0
    WATER BASED
    10.10.1988
    2524
    1.20
    12.0
    4.8
    WATER BASED
    19.08.1988
    2697
    1.25
    12.0
    6.7
    WATER BASED
    19.08.1988
    2843
    1.25
    10.0
    4.8
    WATER BASED
    19.08.1988
    2885
    1.25
    10.0
    4.8
    WATER BASED
    22.08.1988
    2974
    1.25
    9.0
    4.8
    WATER BASED
    22.08.1988
    2995
    1.26
    13.0
    7.2
    WATER BASED
    22.08.1988
    3062
    1.26
    13.0
    7.6
    WATER BASED
    22.08.1988
    3127
    1.26
    13.0
    6.2
    WATER BASED
    22.08.1988
    3166
    1.26
    13.0
    7.2
    WATER BASED
    22.08.1988
    3216
    1.27
    11.0
    5.7
    WATER BASED
    22.08.1988
    3291
    1.27
    11.0
    5.2
    WATER BASED
    22.08.1988
    3292
    1.27
    11.0
    4.8
    WATER BASED
    22.08.1988
    3300
    1.32
    13.0
    6.7
    WATER BASED
    29.08.1988
    3345
    1.32
    16.0
    6.2
    WATER BASED
    29.08.1988
    3371
    1.32
    15.0
    7.2
    WATER BASED
    30.08.1988
    3377
    1.29
    11.0
    4.8
    WATER BASED
    22.08.1988
    3379
    1.32
    14.0
    5.7
    WATER BASED
    31.08.1988
    3396
    1.32
    14.0
    5.7
    WATER BASED
    02.09.1988
    3402
    1.32
    14.0
    5.7
    WATER BASED
    02.09.1988
    3426
    1.32
    17.0
    6.2
    WATER BASED
    05.09.1988
    3435
    1.03
    13.0
    6.7
    WATER BASED
    22.08.1988
    3450
    1.61
    20.0
    12.0
    WATER BASED
    10.10.1988
    3463
    1.32
    18.0
    1.6
    WATER BASED
    05.09.1988
    3467
    1.30
    13.0
    5.7
    WATER BASED
    22.08.1988
    3492
    1.31
    12.0
    5.7
    WATER BASED
    22.08.1988
    3500
    1.32
    13.0
    6.2
    WATER BASED
    22.08.1988
    3502
    1.32
    18.0
    7.6
    WATER BASED
    05.09.1988
    3539
    1.32
    14.0
    6.7
    WATER BASED
    23.08.1988
    3539
    1.32
    14.0
    7.2
    WATER BASED
    24.08.1988
    3539
    1.32
    14.0
    7.2
    WATER BASED
    25.08.1988
    3539
    1.32
    17.0
    7.2
    WATER BASED
    26.08.1988
    3539
    1.32
    17.0
    7.2
    WATER BASED
    29.08.1988
    3539
    1.32
    13.0
    7.2
    WATER BASED
    22.08.1988
    3560
    1.32
    17.0
    8.0
    WATER BASED
    08.09.1988
    3560
    1.32
    17.0
    7.5
    WATER BASED
    13.09.1988
    3560
    1.32
    16.0
    7.5
    WATER BASED
    06.09.1988
    3560
    1.32
    17.0
    7.5
    WATER BASED
    08.09.1988
    3560
    1.32
    17.0
    7.5
    WATER BASED
    09.09.1988
    3560
    1.32
    16.0
    7.0
    WATER BASED
    13.09.1988
    3563
    1.48
    16.0
    7.5
    WATER BASED
    14.09.1988
    3598
    1.48
    18.0
    WATER BASED
    14.09.1988
    3610
    1.48
    20.0
    6.0
    WATER BASED
    15.09.1988
    3674
    1.61
    20.0
    7.0
    WATER BASED
    16.09.1988
    3732
    1.61
    24.0
    7.5
    WATER BASED
    19.09.1988
    3737
    1.61
    25.0
    8.0
    WATER BASED
    19.09.1988
    3750
    1.61
    20.0
    6.0
    WATER BASED
    07.10.1988
    3763
    1.61
    27.0
    5.5
    WATER BASED
    19.09.1988
    3784
    1.61
    27.0
    5.0
    WATER BASED
    20.09.1988
    3806
    1.61
    24.0
    5.0
    WATER BASED
    21.09.1988
    3833
    1.61
    24.0
    5.0
    WATER BASED
    22.09.1988
    3853
    1.61
    21.0
    5.0
    WATER BASED
    23.09.1988
    3944
    1.61
    20.0
    5.5
    WATER BASED
    26.09.1988
    3944
    1.61
    20.0
    5.5
    WATER BASED
    27.09.1988
    3944
    1.61
    20.0
    4.0
    WATER BASED
    29.09.1988
    3944
    1.61
    20.0
    4.0
    WATER BASED
    30.09.1988
    3944
    1.61
    20.0
    5.0
    WATER BASED
    04.10.1988
    3944
    1.61
    19.0
    5.0
    WATER BASED
    04.10.1988
    3944
    1.61
    20.0
    6.0
    WATER BASED
    05.10.1988
    3944
    1.61
    23.0
    6.0
    WATER BASED
    26.09.1988
    3944
    1.61
    20.0
    5.5
    WATER BASED
    28.09.1988
    3944
    1.61
    20.0
    6.0
    WATER BASED
    06.10.1988

  • 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
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