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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35/8-2

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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.
    35/8-2
    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.
    35/8-2
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    79-1-4C SP: 478
    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.
    299-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.
    265
    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,
    30.08.1981
    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.
    21.05.1982
    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.
    21.05.1984
    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.
    15.12.2006
    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.
    GAS/CONDENSATE
    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.
    BRENT GP
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    26.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    376.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4336.0
    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).
    4334.0
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    151
    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.
    EARLY 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.
    STATFJORD GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    61° 16' 15.42'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 21' 58.17'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6793184.26
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    519635.98
    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.
    434

  • Wellbore history
    General
    Wildcat well 35/8-2 is located in the Sogn Graben north of the Fram Field. The main objectives were to test the Middle Jurassic Brent Group as well as sands in the Early Jurassic Dunlin Group and Statfjord Formation on a structure located in the south western corner of the block. No reservoirs were anticipated above the Late Kimmeridge Unconformity.
    Operations and results
    Well 35/8-2 was spudded with the semi-submersible installation Sedco 704 on 30 August 1981 and drilled to TD at 4336 m in the Early Jurassic Statfjord Formation Formation. During hole opening of the 36" section, the drill string parted and left the bit, opener and drill collars in the hole. Fishing was unsuccessful. The well was re-spudded 11 September 1981 and the 17 1/2" pilot hole was drilled without problems. When opening to 36" washing and reaming was required. Few problems were encountered in the 26" section. While drilling the 17 1/2" hole one experienced problems with tight hole at 830 to 883 m, 1610 -1720 m and 1915 - 1940 m. Repairs of the BOP and other unrelated rig problems occurred for 13 days during the drilling of this section. Tight hole was also experienced in the upper part of the 12 1/4" section and at 3100 m where pore pressure also started increasing. Some problems were experienced when coring in the 8 1/2" section. When running in hole with a new bit, the pipe became stuck at 3662 m. Twenty-one days were spent fishing before the hole was plugged back into the 9 5/8" casing. The well was then sidetracked from 3482 m and the 8 1/2" hole was drilled down to 3954 m. Some minor problems with tight hole and differential sticking occurred. A 6 1/8" hole was then drilled to TD at 4336 m. The well was drilled with seawater / pre-hydrated bentonite / gel down to 2155 m and with seawater/bentonite/polymer/LF-5 mud from 2155 m to 3538 m. From 3538 to TD the well was drilled with KCl/polymer mud, which was converted to a lignite/lignosulphonate mud with up to 5% peanut oil.
    Indications of hydrocarbons while drilling occurred in Late Jurassic sandstones and shales, and in Middle and Early Jurassic sandstones. Log analyses indicated a gross hydrocarbon column of 60 m in the Brent Group down to a hydrocarbon/water contact at 3726 m, in a gross hydrocarbon sand thickness of 52 m. On the cores, the contact was indicated at 3733 m. The Early Jurassic sands (Cook and Statfjord Formations) had hydrocarbon shows while drilling. Subsequent log evaluation indicated that these sands were water-bearing.
    A total of 7 cores were taken in the original, unlogged hole (ca 8 m from the logged sidetrack). One core was cut in the Heather sand and six cores were cut in the Middle Jurassic Brent Sand reservoir. Coring continued from 3667.2 to 3753.4 m, through the Tarbert Formation and into the Ness Formation, until hydrocarbon shows were no longer encountered. An RFT run was made in the well, but no fluid samples were obtained.
    The well was permanently abandoned on 21 May 1982 as a gas/condensate discovery.
    Testing
    The well was tested over three intervals. DST 1 in Brent (3694 - 3703 m) tested 447400 Sm3/day gas with 305.3 Sm3 condensate during a 945 minutes flow period before being shut-in for 1560 min. The gas/condensate ratio was 1467 Sm3/Sm3, with condensate density = 0.797 and gas gravity = 0.67 (air = 1). DST 2 (3306 - 3315 m) was considered as an invalid Heather test - the Brent section was inadvertently retested behind casing. However, DST 2 likely tested a different Brent sand than DST 1; with a lower flow capacity and a higher CGR than in DST1. Cement was squeezed before beginning the next test. DST 2A (3306 - 3315 m + 3321 - 3327 m) proved permeability in the Heather formation to be too small to allow fluids to be recovered in the drill pipe.

  • 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]
    580.00
    4332.00

  • 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
    3316.9
    3318.5
    [m ]
    2
    3667.2
    3685.5
    [m ]
    3
    3685.5
    3689.4
    [m ]
    4
    3689.4
    3706.3
    [m ]
    5
    3706.5
    3725.8
    [m ]
    6
    3725.1
    3743.8
    [m ]
    7
    3743.8
    3753.4
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    88.3
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3316-3317m
    Core photo at depth: 3667-3668m
    Core photo at depth: 3669-3671m
    Core photo at depth: 3672-3674m
    Core photo at depth: 3675-3678m
    3316-3317m
    3667-3668m
    3669-3671m
    3672-3674m
    3675-3678m
    Core photo at depth: 3678-3681m
    Core photo at depth: 3681-3683m
    Core photo at depth: 3683-3685m
    Core photo at depth: 3685-3688m
    Core photo at depth: 3688-3691m
    3678-3681m
    3681-3683m
    3683-3685m
    3685-3688m
    3688-3691m
    Core photo at depth: 3691-3693m
    Core photo at depth: 3693-3695m
    Core photo at depth: 3695-3698M
    Core photo at depth: 3698-3700M
    Core photo at depth: 3701-3703M
    3691-3693m
    3693-3695m
    3695-3698M
    3698-3700M
    3701-3703M
    Core photo at depth: 3703-3706M
    Core photo at depth: 3706-3708M
    Core photo at depth: 3708-3711M
    Core photo at depth: 3711-3713M
    Core photo at depth: 3713-3716M
    3703-3706M
    3706-3708M
    3708-3711M
    3711-3713M
    3713-3716M
    Core photo at depth: 3716-3718M
    Core photo at depth: 3718-3721M
    Core photo at depth: 3721-3724M
    Core photo at depth: 3724-3726M
    Core photo at depth: 3726-2738M
    3716-3718M
    3718-3721M
    3721-3724M
    3724-3726M
    3726-2738M
    Core photo at depth: 3728-3720M
    Core photo at depth: 3731-3733M
    Core photo at depth: 3733-3736M
    Core photo at depth: 3736-3738M
    Core photo at depth: 3738-3741M
    3728-3720M
    3731-3733M
    3733-3736M
    3736-3738M
    3738-3741M
    Core photo at depth: 3741-3743M
    Core photo at depth: 3743-3746M
    Core photo at depth: 3746-3749M
    Core photo at depth: 3749-3752M
    Core photo at depth: 3752-3753M
    3741-3743M
    3743-3746M
    3746-3749M
    3749-3752M
    3752-3753M

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2770.0
    [m]
    DC
    RRI
    2790.0
    [m]
    DC
    RRI
    2810.0
    [m]
    DC
    RRI
    2820.0
    [m]
    DC
    RRI
    2840.0
    [m]
    DC
    RRI
    2860.0
    [m]
    DC
    RRI
    2880.0
    [m]
    DC
    RRI
    2900.0
    [m]
    DC
    RRI
    2916.0
    [m]
    DC
    RRI
    2940.0
    [m]
    DC
    RRI
    2956.0
    [m]
    DC
    RRI
    2972.0
    [m]
    DC
    RRI
    2992.0
    [m]
    DC
    RRI
    3008.0
    [m]
    DC
    RRI
    3028.0
    [m]
    DC
    RRI
    3044.0
    [m]
    DC
    RRI
    3060.0
    [m]
    DC
    RRI
    3078.0
    [m]
    DC
    RRI
    3668.4
    [m]
    C
    GEOSTRAT
    3677.8
    [m]
    C
    GEOSTR
    3689.6
    [m]
    C
    GEOSTR
    3692.2
    [m]
    C
    GEOSTR
    3712.8
    [m]
    C
    GEOSTR
    3719.9
    [m]
    C
    GEOSTR
    3725.5
    [m]
    C
    GEOSTR
    3730.6
    [m]
    C
    GEOSTR
    3741.6
    [m]
    C
    GEOSTR
    3748.6
    [m]
    C
    GEOSTR
    3751.0
    [m]
    C
    GEOSTR

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.38
    pdf
    4.06
    pdf
    8.79

  • 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
    14.38
    pdf
    2.59

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    3694
    3703
    17.5
    2.0
    3306
    3315
    17.5
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    133
    2.0
    126
    Drill stem tests (DST)
    Test number
    Oil
    [Sm3/day]
    Gas
    [Sm3/day]
    Oil density
    [g/cm3]
    Gas grav. rel.air
    GOR
    [m3/m3]
    1.0
    305
    447000
    0.797
    0.670
    1467
    2.0
    205
    214000
    0.797
    0.670
    1044

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL
    400
    2137
    CCL GR
    416
    417
    CCL GR
    423
    425
    CCL GR
    449
    451
    CCL GR
    2136
    2137
    CCL PR
    484
    485
    CST
    3210
    3392
    CST
    3958
    4332
    DENS
    578
    841
    DENS CNL GR CAL
    829
    4331
    DLL MSFL GR
    2143
    3533
    DLL MSFL GR SP CAL
    3531
    3952
    HDT
    2143
    3537
    HDT
    3480
    3953
    HDT
    3952
    4321
    HRT
    400
    1154
    HRT
    4330
    400
    ISF SONIC GR SP
    578
    4330
    LSS WAVEFORM
    3300
    3951
    NGT
    3952
    4331
    VSP
    0
    0

  • 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
    578.0
    36
    579.0
    0.00
    LOT
    SURF.COND.
    20
    830.0
    26
    842.0
    1.42
    LOT
    INTERM.
    13 3/8
    2142.0
    17 1/2
    2156.0
    1.65
    LOT
    INTERM.
    9 5/8
    3531.0
    12 1/4
    3538.0
    1.96
    LOT
    LINER
    7
    3954.0
    8 1/2
    3954.0
    2.02
    LOT
    OPEN HOLE
    4335.0
    6 1/4
    4335.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    785
    1.10
    57.0
    WATER BASED
    1160
    1.11
    58.0
    WATER BASED
    1890
    1.20
    70.0
    WATER BASED
    2410
    1.22
    53.0
    WATER BASED
    2855
    1.25
    52.0
    WATER BASED
    3080
    1.44
    50.0
    WATER BASED
    3230
    1.51
    55.0
    WATER BASED
    3570
    1.70
    55.0
    WATER BASED
    3680
    1.77
    55.0
    WATER BASED
    3980
    1.70
    65.0
    WATER BASED

  • Thin sections at the Norwegian Offshore Directorate
    Thin sections at the Norwegian Offshore Directorate
    Depth
    Unit
    3318.20
    [m ]

  • 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