Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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28.11.2024 - 01:28
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31/6-2

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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.
    31/6-2
    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
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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
    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.
    31/6-2
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    ST 8007 - 351 SP 1647
    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.
    Den norske stats oljeselskap a.s
    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.
    393-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,
    18.10.1983
    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.
    11.12.1983
    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.
    11.12.1985
    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.
    06.06.2006
    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.
    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.
    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.
    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.
    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.
    SOGNEFJORD FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    23.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    303.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2020.0
    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).
    2020.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    1
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    65
    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.
    DRAKE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 34' 58.24'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 54' 55.76'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6716831.54
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    550164.40
    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.
    34

  • Wellbore history
    General
    Appraisal well 31/6-2 was drilled on a location on the south-east periphery on the Troll East gas province. The main objective was to test the gas and oil accumulations in sandstones of Late to Middle Jurassic age. The planned TD was about 200 m into rocks of Triassic age to an estimated total depth of 2400 m RKB.
    The well is Reference well for the Hardråde Formation and for the undifferentiated Shetland Group in the Troll area.
    Operations and results
    Well 31/6-2 was spudded with the semi-submersible installation Deepsea Bergen on 18 October 1983 and drilled to TD at 2020 m in the Early Jurassic Drake Formation. Because of problems with a leak in 20" casing and lost circulation problems in a major fault, both 13 3/8" and 9 5/8" casing had to be set high. The well was drilled with sea water and hi-vis pills down to 412 m, with AQUAGEL/seawater spud mud from 412 m to 801 m, with KCl polymer mud from 801 m to TD. At 984 m Lost Circulation Material -pills were added to cure lost circulation problems.
    No reservoir sections were developed above the Jurassic. The well encountered 113 m of Draupne shale with top at 1322 m, overlying a 25 m thick Heather Formation sequence. The Sognefjord Formation sandstone reservoir was encountered at 1460 m with a gas column of approximately 110 m. No oil leg could be detected from electric logs or FMT's. Oil shows were recorded on sidewall core sandstone in the interval from 1831 m to 1988 m in the Middle to Early Jurassic. Nine cores were cut from 1435 m to 1619 m in the Heather and Sognefjord Formations. FMT sampling in the Sognefjord Formation recovered small amounts of gas from 1475 m and 1572 m. A sample from 1577 m gave mud filtrate.
    The well was suspended on 11 December 1983 as a gas 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]
    420.00
    2235.00

  • 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
    1435.0
    1453.3
    [m ]
    2
    1453.0
    1471.4
    [m ]
    3
    1471.6
    1483.6
    [m ]
    4
    1483.6
    1497.1
    [m ]
    5
    1497.1
    1515.9
    [m ]
    6
    1515.7
    1543.4
    [m ]
    7
    1543.6
    1571.5
    [m ]
    8
    1571.5
    1589.0
    [m ]
    9
    1591.0
    1618.3
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    181.4
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1435-1441m
    Core photo at depth: 1441-1447m
    Core photo at depth: 1447-1453m
    Core photo at depth: 1453-1453m
    Core photo at depth: 1453-1459m
    1435-1441m
    1441-1447m
    1447-1453m
    1453-1453m
    1453-1459m
    Core photo at depth: 1459-1465m
    Core photo at depth: 1465-1471m
    Core photo at depth: 1471-1472m
    Core photo at depth: 1471-1477m
    Core photo at depth: 1477-1483m
    1459-1465m
    1465-1471m
    1471-1472m
    1471-1477m
    1477-1483m
    Core photo at depth: 1483-1489m
    Core photo at depth: 1489-1495m
    Core photo at depth: 1495-1497m
    Core photo at depth: 1497-1503m
    Core photo at depth: 1509-1515m
    1483-1489m
    1489-1495m
    1495-1497m
    1497-1503m
    1509-1515m
    Core photo at depth: 1503-1509m
    Core photo at depth: 1515-1516m
    Core photo at depth: 1515-1521m
    Core photo at depth: 1521-1527m
    Core photo at depth: 1527-1533m
    1503-1509m
    1515-1516m
    1515-1521m
    1521-1527m
    1527-1533m
    Core photo at depth: 1533-1539m
    Core photo at depth: 1539-1543m
    Core photo at depth: 1543-1549m
    Core photo at depth: 1549-1555m
    Core photo at depth: 1555-1561m
    1533-1539m
    1539-1543m
    1543-1549m
    1549-1555m
    1555-1561m
    Core photo at depth: 1561-1567m
    Core photo at depth: 1567-1571m
    Core photo at depth: 1571-1577m
    Core photo at depth: 1577-1583m
    Core photo at depth: 1583-1589m
    1561-1567m
    1567-1571m
    1571-1577m
    1577-1583m
    1583-1589m
    Core photo at depth: 1591-1597m
    Core photo at depth: 1597-1603m
    Core photo at depth: 1603-1609m
    Core photo at depth: 1609-1615m
    Core photo at depth: 1615-1618m
    1591-1597m
    1597-1603m
    1603-1609m
    1609-1615m
    1615-1618m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    995.0
    [m]
    SWC
    IKU
    1050.0
    [m]
    SWC
    IKU
    1250.0
    [m]
    SWC
    IKU
    1294.0
    [m]
    SWC
    IKU
    1326.5
    [m]
    SWC
    IKU
    1344.5
    [m]
    SWC
    IKU
    1360.0
    [m]
    SWC
    IKU
    1380.0
    [m]
    SWC
    IKU
    1399.0
    [m]
    SWC
    IKU
    1411.0
    [m]
    SWC
    IKU
    1426.0
    [m]
    SWC
    IKU
    1630.0
    [m]
    SWC
    IKU
    1660.0
    [m]
    SWC
    IKU
    1686.0
    [m]
    SWC
    IKU
    1710.0
    [m]
    SWC
    IKU
    1726.0
    [m]
    SWC
    IKU
    1745.0
    [m]
    SWC
    IKU
    1783.0
    [m]
    SWC
    IKU
    1800.0
    [m]
    SWC
    IKU
    1831.0
    [m]
    SWC
    IKU
    1855.0
    [m]
    SWC
    IKU
    1902.0
    [m]
    SWC
    IKU
    1915.5
    [m]
    SWC
    IKU
    1927.0
    [m]
    SWC
    IKU
    1937.0
    [m]
    SWC
    IKU
    1988.5
    [m]
    SWC
    IKU

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.56
    pdf
    0.48

  • 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
    18.98
    pdf
    1.29
    pdf
    7.28
    pdf
    0.88
    pdf
    0.46
    pdf
    0.66
    pdf
    13.96
    pdf
    6.31
    pdf
    6.12
    pdf
    2.46
    pdf
    0.85
    pdf
    2.60
    pdf
    9.45
    pdf
    0.17
    pdf
    25.98
    pdf
    5.83
    pdf
    8.92
    pdf
    5.38
    pdf
    6.17
    pdf
    6.40
    pdf
    3.19
    pdf
    3.03
    pdf
    17.60
    pdf
    2.77
    pdf
    6.41
    pdf
    1.07

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    ACBL VDL GR
    326
    902
    ACBL VDL GR
    515
    1390
    CDL CNL GR CAL
    800
    2020
    CDL GR CAL
    412
    816
    DIFL BHC AC GR SP
    412
    2020
    DLL MLL GR
    1390
    2020
    FMT
    1390
    2020
    HR DIP
    903
    1400
    HR DIP
    1390
    2020
    SPECTRALOG
    1390
    2020
    VSP
    895
    2020

  • 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
    412.0
    36
    412.0
    0.00
    LOT
    SURF.COND.
    20
    801.0
    26
    818.0
    1.56
    LOT
    INTERM.
    13 3/8
    902.0
    17 1/2
    920.0
    1.76
    LOT
    INTERM.
    9 5/8
    1391.0
    12 1/4
    1400.0
    1.61
    LOT
    LINER
    7
    2004.0
    8 1/2
    2020.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    410
    1.04
    45.0
    WATER BASED
    480
    1.08
    41.0
    WATER BASED
    900
    1.30
    47.0
    WATER BASED
    1010
    1.20
    44.0
    WATER BASED
    1470
    1.25
    46.0
    WATER BASED
    2005
    1.10
    52.0
    4.8
    WATER BASED
    07.08.1984
    2075
    1.10
    63.0
    6.2
    WATER BASED
    07.08.1984
    2235
    1.11
    56.0
    5.8
    WATER BASED
    07.08.1984
    2235
    1.11
    57.0
    4.8
    WATER BASED
    07.08.1984

  • 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
    0.16