Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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19.07.2024 - 01:27
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31/4-11

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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.
    31/4-11
    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
    Press release
    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.
    31/4-11
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    NH9204 RANDOML.1855 CROSSL.891
    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.
    981-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,
    27.07.2000
    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.
    12.09.2000
    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.
    12.09.2002
    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.
    04.10.2013
    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/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.
    VIKING GP
    2nd level with HC, age
    Age of lithostratigraphic unit, 2nd level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE.
    MIDDLE JURASSIC
    2nd level with HC, formation
    Name of lithostartigraphic unit, 2nd 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.
    BRENT GP
    3rd level with HC, age
    Age of lithostratigraphic unit, 3rd level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE.
    MIDDLE JURASSIC
    3rd level with HC, formation
    Name of lithostartigraphic unit, 3rd 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.
    STATFJORD 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.
    183.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3271.0
    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).
    2765.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    58.7
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    108
    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.
    60° 36' 42.58'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 6' 1.74'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6719714.87
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    505501.19
    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.
    4147
  • Wellbore history

    General
    Well 31/4-11 was drilled on the Bowmore structure in the northern part of the Brage Field as a combined appraisal/exploration well. The Bowmore structure is situated about 6-8 km NNE of the Brage platform. It is a NE-SW trending wedge shaped horst, rising and tapering towards the SW. The primary objective was to prove hydrocarbons in the Middle - Late Jurassic Fensfjord Formation. The secondary objectives were to prove hydrocarbons in sandstones of the Late Jurassic Sognefjord and Draupne formations and in the Middle Jurassic Brent Group. During drilling of the well, it was decided to extend the well and explore the hydrocarbon potential in the Statfjord Formation.
    Operations and results
    Wildcat well 31/4-11 was spudded with the semi-submersible installation Scarabeo 6 on 27 July 2000 and drilled to TD at 3271 m (2765 m TVD) in the Early Jurassic Statfjord Group. This is a deviated well. It was drilled vertical down to 1410 m and deviated from there with up to 58.7 deg inclination. The well was drilled with sea water and hi-vis pills down to 283 m and with Glydril mud from 283 m to TD.
    Top Draupne Formation was encountered at 2130 m. Intra Draupne sandstones interbedded with claystones, shale and siltstone were penetrated from 2149 m to top Sognefjord Formation at 2201 m. The Draupne Formation sandstones were gas saturated while only water was sampled in the underlying Sognefjord Formation. However, geochemical analyses of cores indicated an oil column from 2189 m to 2217 m.
    The Fensfjord Formation was penetrated from 2351 m to 2426 m. Moveable oil was proven with an ODT at 2376 m.
    The Brent Group was encountered with top Tarbert Formation at 2644 m. Tarbert and Ness formations contained oil down to a shale sequence at 2682 m in the Ness Formation. Excellent pressure points indicated an OWC at exactly 2696 m.
    Top Statfjord Group was encountered at 3178 m. The Statfjord Group was water bearing with weak shows at the top.
    No oil shows were described above top Jurassic level.
    A total of 16 cores were cut from 2123 m to 2431 m in claystones, siltstones and sandstones of the Draupne, Sognefjord, Heather and Fensfjord formations. Core recovery varied from 6.3% to 100%. Wire line fluid samples were taken in the Draupne and Sognefjord formations at 2162 m (gas), 2182.5 m (gas), and 2205.8 m (water); in the Fensfjord Formation at 2357.5 m (oil) and 2372.3 m (oil); and in the Brent Group at 2678.5 m (oil), 2675.1 m (oil), 2699.2 m (water), and 2712.8 m (water)
    The well was permanently abandoned on 12 September as an oil and 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]
    1110.00
    3270.00
  • 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
    2123.0
    2133.6
    [m ]
    2
    2134.0
    2138.0
    [m ]
    3
    2144.0
    2149.0
    [m ]
    4
    2149.0
    2156.7
    [m ]
    5
    2157.0
    2161.0
    [m ]
    6
    2179.0
    2179.5
    [m ]
    7
    2187.0
    2204.5
    [m ]
    8
    2204.5
    2221.1
    [m ]
    9
    2222.0
    2240.0
    [m ]
    10
    2316.0
    2333.5
    [m ]
    11
    2343.0
    2354.2
    [m ]
    12
    2361.0
    2367.0
    [m ]
    13
    2370.0
    2376.7
    [m ]
    14
    2376.7
    2395.0
    [m ]
    15
    2395.0
    2412.9
    [m ]
    16
    2413.0
    2431.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    179.4
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 2123-2127m
    Core photo at depth: 2127-2131m
    Core photo at depth: 2131-2133m
    Core photo at depth: 2134-2138m
    Core photo at depth: 2134-2138m
    2123-2127m
    2127-2131m
    2131-2133m
    2134-2138m
    2134-2138m
    Core photo at depth: 2144-2148m
    Core photo at depth: 2148-2149m
    Core photo at depth: 2149-2153m
    Core photo at depth: 2153-2156m
    Core photo at depth: 2157-2161m
    2144-2148m
    2148-2149m
    2149-2153m
    2153-2156m
    2157-2161m
    Core photo at depth: 2179-2179m
    Core photo at depth: 2187-2191m
    Core photo at depth: 2191-2195m
    Core photo at depth: 2195-2199m
    Core photo at depth: 2199-2203m
    2179-2179m
    2187-2191m
    2191-2195m
    2195-2199m
    2199-2203m
    Core photo at depth: 2203-2204m
    Core photo at depth: 2204-2208m
    Core photo at depth: 2208-2212m
    Core photo at depth: 2212-2216m
    Core photo at depth: 2216-2220m
    2203-2204m
    2204-2208m
    2208-2212m
    2212-2216m
    2216-2220m
    Core photo at depth: 2220-2221m
    Core photo at depth: 2222-2226m
    Core photo at depth: 2226-2230m
    Core photo at depth: 2230-2234m
    Core photo at depth: 2234-2238m
    2220-2221m
    2222-2226m
    2226-2230m
    2230-2234m
    2234-2238m
    Core photo at depth: 2238-2240m
    Core photo at depth: 2316-2320m
    Core photo at depth: 2320-2334m
    Core photo at depth: 2324-2328m
    Core photo at depth: 2328-2332m
    2238-2240m
    2316-2320m
    2320-2334m
    2324-2328m
    2328-2332m
    Core photo at depth: 2332-2333m
    Core photo at depth: 2343-2347m
    Core photo at depth: 2347-2351m
    Core photo at depth: 2351-2354m
    Core photo at depth: 2361-2365m
    2332-2333m
    2343-2347m
    2347-2351m
    2351-2354m
    2361-2365m
    Core photo at depth: 2365-2367m
    Core photo at depth: 2370-2374m
    Core photo at depth: 2374-2376m
    Core photo at depth: 2376-2380m
    Core photo at depth: 2380-2304m
    2365-2367m
    2370-2374m
    2374-2376m
    2376-2380m
    2380-2304m
    Core photo at depth: 2384-2388m
    Core photo at depth: 2388-2392m
    Core photo at depth: 2392-2395m
    Core photo at depth: 2395-2399m
    Core photo at depth: 2403-2407m
    2384-2388m
    2388-2392m
    2392-2395m
    2395-2399m
    2403-2407m
    Core photo at depth: 2407-2411m
    Core photo at depth: 2411-2412m
    Core photo at depth: 2413-2417m
    Core photo at depth: 2417-2421m
    Core photo at depth: 2421-2425m
    2407-2411m
    2411-2412m
    2413-2417m
    2417-2421m
    2421-2425m
    Core photo at depth: 2425-2429m
    Core photo at depth: 2429-2431m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    2425-2429m
    2429-2431m
  • Palynological slides at the Norwegian Offshore Directorate

    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2115.0
    [m]
    DC
    PETROSTR
    2117.0
    [m]
    DC
    PETROS
    2120.0
    [m]
    DC
    PETROS
    2122.0
    [m]
    DC
    PETROS
    2124.2
    [m]
    C
    PETROS
    2132.4
    [m]
    C
    PETROS
    2135.2
    [m]
    C
    PETROS
    2148.9
    [m]
    C
    PETROS
    2155.5
    [m]
    C
    PETROS
    2163.0
    [m]
    DC
    PETROS
    2167.0
    [m]
    DC
    PETROS
    2170.0
    [m]
    DC
    PETROS
    2172.0
    [m]
    DC
    PETROS
    2175.0
    [m]
    DC
    PETROS
    2177.0
    [m]
    DC
    PETROS
    2197.3
    [m]
    C
    PETROS
    2200.4
    [m]
    C
    PETROS
    2212.2
    [m]
    C
    PETROS
  • Lithostratigraphy

  • Geochemical information

    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.28
    pdf
    0.09
    pdf
    9.45
    pdf
    0.10
  • 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
    9.06
    .pdf
    3.64
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CRFT
    2157
    2162
    DSI VSP
    2000
    2835
    HALS PEX
    1110
    2005
    MDT
    2178
    2784
    MDT
    2182
    2362
    MDT
    2182
    2372
    MDT
    2357
    2701
    MWD - ARC VIS675 ADN
    1950
    2176
    MWD - GST VIS675 ADN
    2160
    3258
    MWD - PP CDR
    209
    2176
  • 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
    283.0
    36
    283.0
    0.00
    LOT
    SURF.COND.
    13 3/8
    1100.0
    17 1/2
    1100.0
    1.68
    LOT
    INTERM.
    9 5/8
    2166.0
    12 1/4
    2176.0
    1.55
    LOT
    OPEN HOLE
    3271.0
    8 1/2
    3271.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    1100
    1.32
    13.0
    water based
    1600
    1.50
    18.0
    water based
    2121
    1.50
    23.0
    water based
    2139
    1.50
    21.0
    water based
    2343
    1.20
    14.0
    water based
    2370
    1.21
    14.0
    water based
    2835
    1.21
    15.0
    water based
    2835
    1.20
    15.0
    water based
    3271
    1.23
    14.0
    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
    0.23