Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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25.11.2024 - 01:30
Time of last synchronization with Norwegian Offshore Directorate's internal systems

25/2-21

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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.
    25/2-21
    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
    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.
    25/2-21
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    Line ABP18306-03407. SP 1175
    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.
    Aker BP 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.
    1774-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.
    13
    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,
    02.07.2019
    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.
    14.07.2019
    Plugged and abondon date
    Date when the P&A-operations of the wellbore was finished, as reported by the operator to the Norwegian Offshore Directorate throught DDRS (Daily Drilling Reporting System). Only applied once pr. wellhead/surface location.
    14.07.2019
    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.
    14.07.2021
    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.
    10.11.2021
    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.
    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.
    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.
    EARLY MIOCENE
    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.
    SKADE FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    30.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    110.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    1200.0
    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).
    1200.0
    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.
    OLIGOCENE
    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.
    HORDALAND GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 52' 27.11'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 27' 30.88'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6637679.76
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    469684.85
    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.
    8814

  • Wellbore history
    General
    Well 25/2-21 is the replacement well for 25/2-20, which was junked due to stuck pipe. It was drilled to test the shallow Liatårnet Prospect in the Fensal Sub-basin east of the Frigg Field in the North Sea. The primary objective was to prove hydrocarbons in the Early Miocene Skade Formation (“Liatårnet sand”).
    Operations and results
    Wildcat well 25/2-21 was spudded with the semi-submersible installation Deepsea Stavanger on 1 July 2019 and drilled to TD at 1200 m in the Late Oligocene sediments in the Hordaland Group. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 987 m and with KCl water-based mud from 987 m to TD.
    Massive Utsira Formation sands were penetrated from at 280 m to 1012.5 m. An 11-meter thick claystone sequence capped the main Liatårnet sand, which was encountered at 1023.5 m. The Liatårnet sand was 28 m vertically thick and hydrocarbon bearing. The entire reservoir was cored and logged. Formation pressure tests in the sands gave a gradient range between 0.8 – 0.9 g/cc. The shallowest oil show in the well is described in thin sandstones at 1018 m, in thin sandstone stringers within the cap rock claystone over the Liatårnet sands. Strong oil shows with fluorescence, cut, stain and bleeding oil were seen throughout the Liatårnet oil-bearing sand to its base at 1052 m.
    There were no shows below 1052 m. No fluid contacts could be established. A deeper sand penetrated from 1098 to 1010 m was water-bearing with a clear water gradient.
    Three cores were cut. Core 1 was cut from 1024.8 to 1042.4 m with 96.3% recovery. Cores 2 and 3 were cut from 1042.7 to 1060.8 m with 100% recovery. Despite several attempts to take an MDT fluid sample, only one bottle was filled during sampling in run 1E at 1025.5 m. Schlumberger Saturn probe was used during this sampling. One 420 cc MPSR bottle were filled after major troubles with sand infill in lines and pump. MPSR bottle was sent to Stratum Reservoir laboratories for analysis. After major challenges in opening the MPSR bottle, pressure was bled of and content was proved to be a slurry of sand and oil. In addition, a small quantity of oil was drained from the cores on the rig. Onshore analyses proved a biodegraded, heavy oil.
    The well was permanently abandoned on 15 July 2019 as an oil 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]
    991.00
    1200.00

  • 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
    1025.8
    1041.8
    [m ]
    2
    1042.7
    1046.4
    [m ]
    3
    1046.4
    1060.8
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    34.0
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    991.0
    [m]
    C
    PETROSTR
    1003.0
    [m]
    C
    PETROS
    1012.0
    [m]
    C
    PETROS
    1024.0
    [m]
    C
    PETROS
    1025.6
    [m]
    C
    PETROS
    1028.9
    [m]
    C
    PETROS
    1030.9
    [m]
    C
    PETROS
    1046.5
    [m]
    C
    PETROS
    1049.8
    [m]
    C
    PETROS
    1050.6
    [m]
    C
    PETROS
    1052.6
    [m]
    C
    PETROS
    1053.9
    [m]
    C
    PETROS
    1057.1
    [m]
    C
    PETROS
    1059.8
    [m]
    C
    PETROS
    1069.0
    [m]
    C
    PETROS
    1087.0
    [m]
    C
    PETROS
    1105.0
    [m]
    C
    PETROS
    1123.0
    [m]
    C
    PETROS
    1144.0
    [m]
    C
    PETROS
    1168.0
    [m]
    C
    PETROS
    1195.0
    [m]
    C
    PETROS
    1200.4
    [m]
    C
    PETROS

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    141
    280
    1013
    1024
    1052

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    FMI PPC MSIP HRLA PEX HNGS GR
    921
    1200
    FTNG
    1035
    1035
    IBC CBL
    153
    986
    LWD - DI
    140
    206
    LWD - GR RES PWD SON
    206
    986
    LWD - RES PWD GR NEU DEN SON
    986
    1200
    MDT
    1025
    1107
    XPT NEXT MRX GR
    1003
    1172

  • 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
    36
    203.0
    42
    206.4
    0.00
    SURF.COND.
    9 5/8
    984.0
    12 1/4
    987.0
    1.36
    FIT
    OPEN HOLE
    1024.8
    8 1/2
    1024.8
    0.00

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    300
    1.03
    Water
    300
    1.10
    Water
    987
    1.20
    Water
    1042
    1.20
    Water
    1200
    1.20
    Water
    1200
    1.21
    Water