Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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19.06.2024 - 01:33
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34/8-8

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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.
    34/8-8
    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).
    APPRAISAL
    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.
    SUSPENDED
    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.
    34/8-8
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    NH-9001-3D: ROW 925 & COL. 585
    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.
    Norsk Hydro Produksjon 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.
    730-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.
    56
    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,
    30.06.1992
    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.
    24.08.1992
    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.
    24.08.1994
    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.
    10.01.2012
    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.
    APPRAISAL
    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.
    OIL
    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
    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.
    23.5
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    340.5
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3625.0
    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).
    3623.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    6.5
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    125
    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 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.
    LUNDE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    61° 22' 46.19'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 28' 43.81'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6805332.03
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    472148.13
    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.
    1969
  • Wellbore history

    General
    Well 34/8-8 was drilled to appraise the N-1 segment of the 34/8-1 Visund discovery on Tampen Spur in the Northern North Sea. The N-1 segment is estimated to contain approximately 30% of the resources in the Brent-North area. Confirmation of these resources was critical for reservoir management and production layout in future development plans. The primary objectives of the well were thus to confirm the resources in the Brent Group and to obtain data that could be used in reservoir engineering studies on improved oil recovery. Secondary objectives were evaluations of the Statfjord Formation and the Lunde B/C Formation. The well design and location was chosen primarily to evaluate the Brent target with respect to defining fluid contacts in clean sands, avoid faults, and penetrate as close as possible to the erosion edge of the top of the Brent Group.
    Operations and results
    Appraisal well 34/8-8 was spudded with the semi-submersible installation Transocean 8 on 30 June 1992 and drilled to TD at 3625 m in the Late Triassic Lund Formation. After drilling to 1430 m in the 12 1/4" section the drill string got stuck. 16.55 m of the BHA was left in the hole and the hole was plugged back to 1354 m where a minor technical sidetrack was performed. After setting the 30" casing an industry strike caused ca 5 days downtime. The well was drilled with spud mud down to 1364 m, and with Anco 2000 glycol mud from 1364 m to TD.
    The Brent Group was encountered at 2921 to 3077 m. It was oil bearing and wire line logs confirmed an OWC at 2971 m, while RFT pressure tests suggested a free water level between 2973.4 m and 2976.8 m. From a gross Brent Group thickness of 156 m, a net pay thickness of 97 m was identified. An average porosity of 20.6% and average Sw of 34.7% were computed for the Brent Group oil zone. The Cook Formation, from 3122.5 to 3260 m, was found to be water wet without shows. The Amundsen Formation, from 3287 to 3387.5 m, was mainly claystone, but had a 12 m thick sandstone towards its base. The Amundsen Formation was water wet without shows. The Statfjord Formation was penetrated from 3387.5 to 3475 m. From a gross thickness of 87.5 m, a total net sand thickness of 46.25 m was recognised. The Lunde Formation was encountered at 3475 m and continued to TD. Both the Statfjord and Lunde formations were water wet without shows. Apart from in the oil bearing Brent reservoir, oil shows were recorded only in cuttings from thin sand stringers at 2460 m, 2515 m, and 2615 m in the Kyrre Formation.
    Ten conventional cores were cut in the well. The whole of the Brent Group was cored in eight cores and two cores were taken in the Hegre Group. RFT fluid samples were taken at 2923.3 m in the Brent oil zone (water and filtrate), 2940 m in the Brent oil zone, at 2983.5 m in the Brent water zone (water and some gas), at 3390 m in the top of the Statfjord Formation (water and some gas).
    The well was suspended on 24 August 1992 with the provision for further testing. It is classified as an oil appraisal.
    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]
    1370.00
    3620.00
  • 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
    2885.0
    2912.0
    [m ]
    2
    2912.0
    2919.0
    [m ]
    3
    2920.5
    2948.0
    [m ]
    4
    2948.0
    2975.8
    [m ]
    5
    2976.5
    3004.0
    [m ]
    6
    3004.0
    3031.5
    [m ]
    7
    3031.5
    3066.0
    [m ]
    8
    3068.5
    3083.0
    [m ]
    9
    3503.0
    3517.2
    [m ]
    10
    3567.4
    3575.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    215.1
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 2885-2890m
    Core photo at depth: 2890-2895m
    Core photo at depth: 2895-2900m
    Core photo at depth: 2900-2905m
    Core photo at depth: 2905-2910m
    2885-2890m
    2890-2895m
    2895-2900m
    2900-2905m
    2905-2910m
    Core photo at depth: 2910-2912m
    Core photo at depth: 2912-2917m
    Core photo at depth: 2917-2919m
    Core photo at depth: 2920-2925m
    Core photo at depth: 2925-2930m
    2910-2912m
    2912-2917m
    2917-2919m
    2920-2925m
    2925-2930m
    Core photo at depth: 2930-2935m
    Core photo at depth: 2935-2940m
    Core photo at depth: 2940-2945m
    Core photo at depth: 2945-2948m
    Core photo at depth: 2948-2953m
    2930-2935m
    2935-2940m
    2940-2945m
    2945-2948m
    2948-2953m
    Core photo at depth: 2953-2958m
    Core photo at depth: 2958-2963m
    Core photo at depth: 2963-2968m
    Core photo at depth: 2968-2973m
    Core photo at depth: 2973-2975m
    2953-2958m
    2958-2963m
    2963-2968m
    2968-2973m
    2973-2975m
    Core photo at depth: 2976-2981m
    Core photo at depth: 2981-2986m
    Core photo at depth: 2986-2991m
    Core photo at depth: 2991-2996m
    Core photo at depth: 2996-3001m
    2976-2981m
    2981-2986m
    2986-2991m
    2991-2996m
    2996-3001m
    Core photo at depth: 3001-3004m
    Core photo at depth: 3004-3009m
    Core photo at depth: 3009-3014m
    Core photo at depth: 3014-3019m
    Core photo at depth: 3019-3024m
    3001-3004m
    3004-3009m
    3009-3014m
    3014-3019m
    3019-3024m
    Core photo at depth: 3024-3029m
    Core photo at depth: 3073-3078m
    Core photo at depth: 3029-3031m
    Core photo at depth: 3031-3036m
    Core photo at depth: 3036-3041m
    3024-3029m
    3073-3078m
    3029-3031m
    3031-3036m
    3036-3041m
    Core photo at depth: 3041-3046m
    Core photo at depth: 3046-3051m
    Core photo at depth: 3051-3056m
    Core photo at depth: 3056-3061m
    Core photo at depth: 3061-3066m
    3041-3046m
    3046-3051m
    3051-3056m
    3056-3061m
    3061-3066m
    Core photo at depth: 3068-3073m
    Core photo at depth: 3078-3083m
    Core photo at depth: 3503-3508m
    Core photo at depth: 3508-3513m
    Core photo at depth: 3513-3517m
    3068-3073m
    3078-3083m
    3503-3508m
    3508-3513m
    3513-3517m
    Core photo at depth: 3567-3572m
    Core photo at depth: 3572-3575m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3567-3572m
    3572-3575m
  • Palynological slides at the Norwegian Offshore Directorate

    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2880.0
    [m]
    DC
    GEOSTR
    2887.0
    [m]
    DC
    GEOSTR
    3258.0
    [m]
    SWC
    HYDRO
    3367.0
    [m]
    SWC
    HYDRO
    3440.0
    [m]
    SWC
    HYDRO
    3477.0
    [m]
    SWC
    HYDRO
    3482.0
    [m]
    SWC
    HYDRO
    3565.0
    [m]
    SWC
    HYDRO
  • Lithostratigraphy

  • Geochemical information

    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.74
    pdf
    0.62
    pdf
    2.69
  • 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
    22.13
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CST GR
    2830
    3596
    CST GR
    3093
    3596
    DIL LSS GR SP CAL AMS
    360
    2735
    DIL LSS LDL CNL NGL SP AMS
    2764
    3622
    DLL MSFL LDL CNL GR SP AMS
    2764
    3294
    FMI GR
    2764
    3622
    MWD - GR RES DIR
    364
    3625
    NMRT
    2862
    3105
    NMRT
    2865
    3110
    RFT GR
    2922
    3256
    RFT HP GR
    2922
    2964
    RFT HP GR
    2983
    3505
    RFT HP GR
    3390
    3390
    SUMT GR GHMT
    2860
    3105
    VELOCITY
    1410
    3600
  • 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
    451.0
    36
    452.0
    0.00
    LOT
    INTERM.
    13 3/8
    1351.0
    17 1/2
    1353.0
    1.66
    LOT
    INTERM.
    9 5/8
    2765.0
    12 1/4
    2766.0
    1.82
    LOT
    LINER
    7
    3170.0
    8 1/2
    3625.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    432
    1.03
    14.0
    WATER BASED
    452
    1.06
    14.0
    WATER BASED
    621
    1.20
    24.0
    WATER BASED
    900
    1.20
    23.0
    WATER BASED
    1112
    1.05
    13.0
    WATER BASED
    1348
    1.39
    14.0
    WATER BASED
    1360
    1.39
    24.0
    WATER BASED
    1364
    1.39
    14.0
    WATER BASED
    1390
    1.38
    12.0
    WATER BASED
    1392
    1.39
    20.0
    WATER BASED
    1430
    1.39
    19.0
    WATER BASED
    1512
    1.40
    26.0
    WATER BASED
    1767
    1.39
    25.0
    WATER BASED
    2179
    1.47
    29.0
    WATER BASED
    2459
    1.47
    28.0
    WATER BASED
    2765
    1.47
    30.0
    WATER BASED
    2885
    1.62
    29.0
    WATER BASED
    2916
    1.62
    30.0
    WATER BASED
    2948
    1.62
    33.0
    WATER BASED
    2990
    1.65
    28.0
    WATER BASED
    3006
    1.60
    37.0
    WATER BASED
    3032
    1.62
    29.0
    WATER BASED
    3074
    1.62
    33.0
    WATER BASED
    3109
    1.67
    30.0
    WATER BASED
    3114
    1.62
    32.0
    WATER BASED
    3172
    1.70
    30.0
    WATER BASED
    3300
    1.62
    33.0
    WATER BASED
    3475
    1.60
    31.0
    WATER BASED
    3516
    1.60
    34.0
    WATER BASED
    3625
    1.60
    34.0
    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
    0.22