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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31/2-4

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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.
    31/2-4
    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
    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
    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.
    31/2-4
    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.
    A/S Norske Shell
    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.
    261-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,
    01.09.1980
    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.
    13.09.1980
    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.
    13.09.1982
    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.
    15.02.2006
    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
    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.
    25.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    336.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    815.0
    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).
    815.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    0.5
    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.
    60° 51' 23.57'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 30' 44.33'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6747077.42
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    527835.00
    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.
    208

  • Wellbore history
    General
    Well 31/2-4 is located some 10 km NNW of the discovery well 31/2-1 in a separate fault compartment near the crest of the Jurassic gas accumulation. This crestal area appeared also to coincide with the culminations of all deeper horizons that could be mapped. The well had two main objectives. The first was to appraise the Jurassic gas accumulation in the 31/2-1 Troll Discovery in a location with nearly maximum gross hydrocarbon column. The well should test lateral variations in this reservoir. The second major objective was to explore deeper Triassic/Palaeozoic Formations. The well would test possible hydrocarbon accumulations under the Late Jurassic Troll reservoir, explore possible pre-Jurassic source rocks, and provide geological ages for deep horizons and thus improve the regional geological setting.
    TD of the well was proposed to be 5000 m below sea level or in Palaeozoic formations whatever came first.
    Operations and results
    Well 31/2-4 was spudded with the semi-submersible installation Borgny Dolphin on 1 September 1980 and drilled to TD at 815 m in the Hordaland Group. The well was drilled with seawater and hi-vis pills. After having set the 20" casing, the well was secured and suspended on September 13 due to a farm out of the rig to Statoil. Statoil had requested the Borgny Dolphin to be released to secure their well 34/10-10, which was blowing gas from a shallow gas zone.
    The well was classified as a dry well.
    Testing
    No drill stem test was performed in the well.

  • 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]
    460.00
    5025.00

  • 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
    420.0
    36
    425.0
    0.00
    LOT
    CONDUCTOR
    30
    446.0
    36
    450.0
    0.00
    LOT
    SURF.COND.
    20
    782.0
    26
    790.0
    0.00
    LOT
    SURF.COND.
    20
    807.0
    26
    815.0
    1.71
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    BGT GR
    807
    1274
    BGT GR
    1270
    1933
    BGT GR
    1270
    1938
    BGT GR
    1270
    1939
    BGT GR
    1271
    1940
    CBL VDL GR
    600
    1804
    CBL VDL GR
    719
    1271
    CBL VDL GR
    719
    1276
    CBL VDL GR CCL
    352
    1913
    CBL VDL GR CCL
    1800
    3985
    DDBHC GR
    1271
    1940
    DLL MSFL GR
    1271
    1936
    FDC CNL GR CAL
    450
    818
    FDC CNL GR CAL
    807
    1270
    FDC CNL GR CAL
    1271
    1938
    FDC CNL GR CAL
    1926
    3990
    FDC CNL GR CAL
    3985
    5032
    HDT
    1271
    1938
    HDT
    1926
    3990
    HDT
    3985
    5032
    ISF BHC GR SP
    450
    818
    ISF BHC GR SP
    807
    1269
    ISF BHC GR SP
    1271
    1938
    ISF BHC GR SP
    1926
    3988
    ISF BHC GR SP
    3985
    5031
    ISF BHC GR SP
    3985
    5031
    LDT CNL GR
    1271
    1936
    LDT CNL GR
    1350
    1635
    NGT
    1271
    1938
    RFT
    1396
    1845
    RFT GR
    2142
    3585
    RFT GR
    4104
    4955

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    361
    494
    528
    724

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.42
    pdf
    1.24
    pdf
    1.25

  • 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
    28.56
    pdf
    2.47
    pdf
    10.67
    pdf
    1.75
    pdf
    4.07
    pdf
    1.39
    pdf
    0.61
    pdf
    0.58
    pdf
    0.69
    pdf
    1.63
    pdf
    1.61
    pdf
    1.65
    pdf
    1.81
    pdf
    2.23
    pdf
    0.50
    pdf
    3.07
    pdf
    2.68
    pdf
    8.31
    pdf
    5.07
    pdf
    1.09
    pdf
    0.97
    pdf
    0.87
    pdf
    0.07
    pdf
    0.34
    pdf
    0.35
    pdf
    0.35
    pdf
    0.13
    pdf
    0.14
    pdf
    0.53
    pdf
    26.75
    pdf
    1.38
    pdf
    7.83
    pdf
    1.41
    pdf
    0.81
    pdf
    0.40
    pdf
    0.38
    pdf
    1.12
    pdf
    0.57
    pdf
    0.58
    pdf
    7.26
    pdf
    2.77
    pdf
    4.74

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    353
    1.05
    100.0
    seawater
    790
    1.28
    52.0
    seawater

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1371.2
    [m]
    C
    SHELL
    1375.9
    [m]
    C
    SHELL
    1376.6
    [m]
    C
    SHELL
    1380.8
    [m]
    C
    SHELL
    1398.3
    [m]
    C
    SHELL
    1398.8
    [m]
    C
    SHELL
    1403.6
    [m]
    C
    SHELL
    1412.0
    [m]
    C
    SHELL
    1413.6
    [m]
    C
    SHELL
    1460.8
    [m]
    C
    SHELL
    1460.9
    [m]
    C
    SHELL
    1463.5
    [m]
    C
    SHELL
    1516.6
    [m]
    C
    SHELL
    1518.3
    [m]
    C
    SHELL
    1521.6
    [m]
    C
    SHELL
    1521.7
    [m]
    C
    SHELL
    1521.7
    [m]
    C
    SHELL
    1521.9
    [m]
    C
    SHELL
    1522.1
    [m]
    C
    SHELL
    1522.2
    [m]
    C
    SHELL
    1523.1
    [m]
    C
    SHELL
    1524.0
    [m]
    C
    SHELL
    1524.0
    [m]
    C
    SHELL
    1526.1
    [m]
    C
    SHELL
    1530.5
    [m]
    C
    SHELL
    1530.6
    [m]
    C
    SHELL
    1530.7
    [m]
    C
    SHELL
    1531.6
    [m]
    C
    SHELL
    1531.9
    [m]
    C
    SHELL
    1532.5
    [m]
    C
    SHELL
    1532.6
    [m]
    C
    SHELL
    1537.7
    [m]
    C
    SHELL
    1542.4
    [m]
    C
    SHELL
    1544.0
    [m]
    C
    SHELL
    1545.9
    [m]
    C
    SHELL
    1546.4
    [m]
    C
    SHELL
    1546.8
    [m]
    C
    SHELL
    1546.9
    [m]
    C
    SHELL
    1548.2
    [m]
    C
    SHELL
    1549.0
    [m]
    C
    SHELL
    1557.6
    [m]
    C
    SHELL
    1562.0
    [m]
    C
    SHELL
    1562.9
    [m]
    C
    SHELL
    1596.6
    [m]
    C
    SHELL
    1625.1
    [m]
    C
    SHELL
    1661.9
    [m]
    C
    SHELL
    1662.4
    [m]
    C
    SHELL