Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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01.11.2024 - 01:26
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35/12-3 S

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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.
    35/12-3 S
    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
    Multilateral
    Indicator telling if the parent well is multilateral, meaning it has more than one branch radiating from the main borehole. Example of legal values: YES, NO. See also Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    NO
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    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.
    35/12-3
    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.
    Wintershall Norge ASA
    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.
    1333-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.
    55
    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,
    24.12.2010
    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.
    16.02.2011
    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.
    14.11.2012
    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.
    14.11.2012
    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.
    WILDCAT
    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.
    29.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    352.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2807.0
    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).
    2758.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    23
    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.
    ETIVE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    61° 5' 19.99'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 44' 56.37'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6773079.85
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    540398.01
    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.
    6516

  • Wellbore history
    General
    Well 35/12-3 S was drilled on the Gnatcatcher prospect in license PL 378. The Gnatcatcher prospect is located on the East flank of the Sogn Graben in the Northern North Sea, with a number of nearby fields and discoveries (Grosbeak, Fram East, Fram West, Gjøa, and Troll). The primary objective was to test the hydrocarbon potential in sandstones of the Late Jurassic Sognefjord Formation. Hydrocarbons in sandstones in of the Middle Jurassic Fensfjord Formation and Brent Group were secondary objectives.
    Operations and results
    Wildcat well 35/12-3 S was spudded with the semi-submersible installation Songa Delta on 24 December 2011 and drilled to TD at 2807 m in the Middle Jurassic Etive Formation. No significant problem was encountered during drilling and logging operations. Sixteen day were spent as WOW after logging at TD before anchors could be pulled and the well abandoned. The well was drilled wit bentonite mud down to 523 m and with Aquacol KCl/polymer mud with 6% glycol from 523 m to TD.
    All major stratigraphic units were encountered within their uncertainty. The Draupne Formation was encountered at 2019 m. The Heather Formation was penetrated from 2033 m down to top Brent Group at 2717 m. It consisted of five siltstone/claystone units separated by four major sandstone units: the Sognefjord Formation with sandstone from 2046.5 to 2058.0 m, an upper Fensfjord Formation sandstone from 2165 to 2269 m and a lower Fensfjord Formation from 2340 to 2547 m, and the Krossfjord Formation from 2594 to 2716 m. In the Brent Group, the Ness Formation showed minor sands developed whereas thick sand was encountered in the Etive Formation. All sands were water bearing.
    Inconclusive hydrocarbon shows without increased gas values were seen in the Sognefjord Formation sandstone: "very weak dull yellow direct fluorescence and strong slow blue yellow cut fluorescence in the uppermost part of the interval, thereafter no direct fluorescence, slow, occasionally moderate fast, moderate strong blue yellowish blue cut fluorescence. All samples show yellowish white fluorescent residue". Organic geochemical analyses of cores samples from the shows interval gave a hydrocarbon fingerprint that suggested very low maturity, probably derived from organic matter in local Heather Formation siltstone.
    Two cores totalling 39 m were cut from 2040.00 m to 2078.5 m in the Heather Formation including the entire Sognefjord  Formation sandstone. The core depths and loggers depths were equal. RCI water samples were taken at 2054.5 m in Sognefjord Formation sandstone and at 2453.4 m in the Fensfjord Formation.
    The well was permanently abandoned on 16 February 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]
    530.00
    2806.50

  • 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
    2040.0
    2059.7
    [m ]
    2
    2062.0
    2080.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    37.6
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • 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
    437.0
    36
    437.0
    0.00
    LOT
    SURF.COND.
    20
    521.0
    26
    523.0
    0.00
    LOT
    PILOT HOLE
    523.0
    9 7/8
    523.0
    0.00
    LOT
    INTERM.
    13 3/8
    1144.0
    17 1/2
    1150.0
    0.00
    LOT
    INTERM.
    9 5/8
    1886.0
    12 1/4
    1894.0
    0.00
    LOT
    OPEN HOLE
    2807.0
    8 1/2
    2807.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    MWD - DI
    381
    523
    MWD - GR RES DI PWD
    381
    523
    MWD - GR RES DI PWD DEN NEU CAL
    1150
    1894
    MWD - GR RES DI PWD SON
    523
    1150
    MWD - RAB GR RES DI PWD
    1894
    2040
    MWD - RAB GR RES DI PWD DEN NEU
    1981
    2807
    RCI
    2050
    2783
    STAR
    1886
    2775
    VSP
    1140
    2780

  • Lithostratigraphy

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    410
    1.05
    BENTONITE MUD
    500
    1.28
    16.0
    AQUACOL KCL/POLYMER/GLYCOL
    523
    1.05
    BENTONITE MUD
    599
    1.17
    10.0
    AQUACOL KCL/POLYMER/GLYCOL
    1150
    1.30
    13.0
    AQUACOL KCL/POLYMER/GLYCOL
    1216
    1.32
    14.0
    AQUACOL KCL/POLYMER/GLYCOL
    1894
    1.32
    18.0
    AQUACOL KCL/POLYMER/GLYCOL
    2062
    1.25
    19.0
    AQUACOL KCL/POLYMER/GLYCOL
    2560
    1.28
    16.0
    AQUACOL KCL/POLYMER/GLYCOL
    2807
    1.28
    9.0
    AQUACOL KCL/POLYMER/GLYCOL