Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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05.11.2024 - 01:27
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31/6-3

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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.
    31/6-3
    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
    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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    31/6-3
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    ST 8007 - 107 SP 1025
    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.
    394-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.
    56
    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,
    01.11.1983
    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.
    26.12.1983
    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.
    26.12.1985
    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.
    29.06.2004
    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.
    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.
    301.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2250.0
    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).
    2250.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    0.8
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    76
    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.
    TRIASSIC
    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.
    HEGRE GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 30' 4.77'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 59' 53.57'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6707818.42
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    554834.84
    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.
    35

  • Wellbore history
    General
    The primary objective of the wildcat 31/6-3 was to assess possible hydrocarbon accumulations in the sands and sandstones of the Late Jurassic Sognefjord Formation. The target was prospect C, a structural trap in the southeastern corner of block 31/6 extending into the adjacent blocks 31/9, 32/4 and 32/7. The well was located on the apex of prospect C. The secondary objective of the well was to obtain Sedimentological data for the Sognefjord Formation sandstones in the well location. The well was planned to reach total depth at ca 2200 m, approximately 100 m into the Triassic.
    Operations and results
    The well was spudded with the semi-submersible installation Nortrym on 1 November 1983. Repositioning of the rig had to be done due to anchoring problems. At 1950 m the drill string was hung off. Problems when attempting to retrieve the drill string resulted in pulling of BOP. When running in hole after 7 days, 10 m of fill was found. No other major problems occurred during drilling and the well reached planned TD at 2250 m in the Triassic Hegre Group. The well was drilled with seawater and hi-vis pills down to 618 m and with KCl/Polymer mud from 618 m to TD.
    The well encountered water-bearing sandstones in the Late/Middle Jurassic Sognefjord Formation as well as in the lower lying sandstones. No oil shows were noted on cores, sidewall cores or cuttings in any section of the well. Gas readings were low or nil throughout except for a 2.6% methane reading in a shallow sand unit at 414 m. The Sognefjord Formation sandstones (1511-1647 m) are very fine to fine, occasionally medium grained, micaceous, occasionally carbonaceous and slightly argillaceous. In places the sandstones grade into siltstones. They are well to moderately sorted and have fair visible porosity. The underlying Sognefjord, Fensfjord, and Krossfjord Formations (1647-1931.5m) are dominated by fine to medium, locally very fine or coarse grained sandstones which are often calcite cemented and have a fair visible porosity. Occasional interbeds of siltstone are also present together with some stringers of limestone, in the upper part yellow brown and very hard, becoming light grey and softer further down. The log evaluation gave a net sand thickness of 382,75 m out of a gross thickness of 420,5 m for the interval (1511 m to 1931.5 m) with an average porosity of 21.0% and an average water saturation of 96.1% (cut-off values used in the calculations were: 0<0,12, VSH>0,40). Eighteen FMT pressure test were performed over the interval 1513,5 m to 2146 m. From the pressure tests a water gradient of 0.1012 bar/m (1.033 g/cc) was calculated. A total of twelve cores were cut in the well. The cores recovered most of the Heather and Sognefjord Formations, and 25 m from the upper part of Fensfjord Formatio. No fluid samples were taken in the well.
    The well was permanently abandoned as a dry well on 26 December 1983.
    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]
    410.00
    2250.00

  • 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
    1495.0
    1499.4
    [m ]
    2
    1499.5
    1509.0
    [m ]
    3
    1509.0
    1521.5
    [m ]
    4
    1528.0
    1528.6
    [m ]
    5
    1533.5
    1542.7
    [m ]
    6
    1551.5
    1565.4
    [m ]
    7
    1565.5
    1582.5
    [m ]
    8
    1582.5
    1601.3
    [m ]
    9
    1601.5
    1620.0
    [m ]
    10
    1620.0
    1638.5
    [m ]
    11
    1638.5
    1665.8
    [m ]
    12
    1666.0
    1694.1
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    178.3
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1495-1499m
    Core photo at depth: 1499-1503m
    Core photo at depth: 1504-1508m
    Core photo at depth: 1509-1513m
    Core photo at depth: 1514-1518m
    1495-1499m
    1499-1503m
    1504-1508m
    1509-1513m
    1514-1518m
    Core photo at depth: 1519-1521m
    Core photo at depth: 1528-1529m
    Core photo at depth: 1533-1537m
    Core photo at depth: 1538-1542m
    Core photo at depth: 1551-1555m
    1519-1521m
    1528-1529m
    1533-1537m
    1538-1542m
    1551-1555m
    Core photo at depth: 1556-1560m
    Core photo at depth: 1561-1564m
    Core photo at depth: 1565-1569m
    Core photo at depth: 1570-1574m
    Core photo at depth: 1575-1579m
    1556-1560m
    1561-1564m
    1565-1569m
    1570-1574m
    1575-1579m
    Core photo at depth: 1580-1581m
    Core photo at depth: 1582-1588m
    Core photo at depth: 1587-1591m
    Core photo at depth: 1592-1596m
    Core photo at depth: 1597-1600m
    1580-1581m
    1582-1588m
    1587-1591m
    1592-1596m
    1597-1600m
    Core photo at depth: 1601-1605m
    Core photo at depth: 1606-1610m
    Core photo at depth: 1611-1615m
    Core photo at depth: 1616-1619m
    Core photo at depth: 1620-1624m
    1601-1605m
    1606-1610m
    1611-1615m
    1616-1619m
    1620-1624m
    Core photo at depth: 1625-1629m
    Core photo at depth: 1630-1624m
    Core photo at depth: 1635-1638m
    Core photo at depth: 1638-1642m
    Core photo at depth: 1643-1647m
    1625-1629m
    1630-1624m
    1635-1638m
    1638-1642m
    1643-1647m
    Core photo at depth: 1648-1652m
    Core photo at depth: 1653-1657m
    Core photo at depth: 1658-1662m
    Core photo at depth: 1663-1665m
    Core photo at depth: 1666-1670m
    1648-1652m
    1653-1657m
    1658-1662m
    1663-1665m
    1666-1670m
    Core photo at depth: 1671-1675m
    Core photo at depth: 1676-1680m
    Core photo at depth: 1681-1685m
    Core photo at depth: 1686-1690m
    Core photo at depth: 1691-1694m
    1671-1675m
    1676-1680m
    1681-1685m
    1686-1690m
    1691-1694m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    790.3
    [m]
    SWC
    IKU
    800.2
    [m]
    SWC
    IKU
    805.2
    [m]
    SWC
    IKU
    807.7
    [m]
    SWC
    IKU
    815.2
    [m]
    SWC
    IKU
    840.2
    [m]
    SWC
    IKU
    880.2
    [m]
    SWC
    IKU
    895.2
    [m]
    SWC
    IKU
    910.2
    [m]
    SWC
    IKU
    940.3
    [m]
    SWC
    IKU
    995.2
    [m]
    SWC
    IKU
    1005.0
    [m]
    SWC
    IKU
    1015.0
    [m]
    SWC
    IKU
    1035.0
    [m]
    SWC
    IKU
    1075.0
    [m]
    SWC
    IKU
    1110.0
    [m]
    SWC
    IKU
    1150.0
    [m]
    SWC
    IKU
    1220.0
    [m]
    SWC
    IKU
    1245.0
    [m]
    SWC
    IKU
    1255.0
    [m]
    SWC
    IKU
    1270.0
    [m]
    SWC
    IKU
    1290.0
    [m]
    SWC
    IKU
    1300.0
    [m]
    SWC
    IKU
    1302.0
    [m]
    DC
    RRI
    1310.0
    [m]
    SWC
    IKU
    1315.0
    [m]
    SWC
    IKU
    1332.0
    [m]
    SWC
    IKU
    1336.0
    [m]
    SWC
    IKU
    1363.7
    [m]
    SWC
    IKU
    1370.0
    [m]
    SWC
    IKU
    1370.0
    [m]
    DC
    RRI
    1375.0
    [m]
    SWC
    IKU
    1380.0
    [m]
    SWC
    IKU
    1390.0
    [m]
    SWC
    IKU
    1400.0
    [m]
    SWC
    IKU
    1400.0
    [m]
    DC
    RRI
    1410.0
    [m]
    SWC
    IKU
    1420.0
    [m]
    SWC
    IKU
    1430.0
    [m]
    SWC
    IKU
    1440.0
    [m]
    SWC
    IKU
    1440.0
    [m]
    DC
    RRI
    1452.0
    [m]
    SWC
    IKU
    1461.0
    [m]
    SWC
    IKU
    1470.0
    [m]
    SWC
    IKU
    1480.0
    [m]
    DC
    RRI
    1481.0
    [m]
    SWC
    IKU
    1490.0
    [m]
    SWC
    IKU
    1530.0
    [m]
    DC
    RRI
    1551.5
    [m]
    C
    RRI
    1622.0
    [m]
    DC
    RRI
    1700.0
    [m]
    SWC
    IKU
    1710.0
    [m]
    SWC
    IKU
    1720.0
    [m]
    SWC
    IKU
    1720.0
    [m]
    DC
    RRI
    1730.0
    [m]
    SWC
    IKU
    1750.0
    [m]
    SWC
    IKU
    1760.0
    [m]
    SWC
    IKU
    1800.0
    [m]
    DC
    RRI
    1810.0
    [m]
    SWC
    IKU
    1820.0
    [m]
    SWC
    IKU
    1830.0
    [m]
    SWC
    IKU
    1840.0
    [m]
    SWC
    IKU
    1880.0
    [m]
    SWC
    IKU
    1880.0
    [m]
    DC
    RRI
    1910.0
    [m]
    SWC
    IKU
    1930.0
    [m]
    SWC
    IKU
    1940.0
    [m]
    SWC
    IKU
    1950.0
    [m]
    SWC
    IKU
    1960.0
    [m]
    SWC
    IKU
    1963.0
    [m]
    DC
    RRI
    1970.0
    [m]
    SWC
    IKU
    1980.0
    [m]
    SWC
    IKU
    2010.0
    [m]
    SWC
    IKU
    2018.5
    [m]
    SWC
    2030.0
    [m]
    DC
    RRI
    2040.0
    [m]
    SWC
    IKU
    2040.0
    [m]
    SWC
    2060.0
    [m]
    SWC
    IKU
    2084.0
    [m]
    SWC
    2105.0
    [m]
    SWC
    IKU
    2117.0
    [m]
    SWC
    2130.0
    [m]
    DC
    RRI
    2131.5
    [m]
    SWC
    2140.0
    [m]
    SWC
    IKU
    2162.0
    [m]
    SWC
    2175.0
    [m]
    SWC
    IKU
    2180.0
    [m]
    SWC
    2220.0
    [m]
    DC
    RRI

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.43

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    6.70
    pdf
    1.19
    pdf
    7.09

  • 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
    14.70

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CDL CNL GR CAL
    399
    616
    CDL CNL GR CAL
    600
    1362
    CDL CNL GR CAL
    1350
    2247
    DIFL LS BHC SP GR
    399
    619
    DIFL LS BHC SP GR
    600
    1362
    DIFL LS BHC SP GR
    1360
    2250
    FMT
    1513
    2146
    GR
    326
    619
    HRD
    600
    1364
    HRD
    1360
    2243
    MLL
    1360
    2250
    SL
    1350
    2247
    SWC
    600
    1364
    SWC
    1370
    1800
    SWC
    1805
    2230
    VSP
    700
    2240

  • 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
    399.0
    36
    400.0
    0.00
    LOT
    SURF.COND.
    20
    600.0
    26
    618.0
    1.39
    LOT
    INTERM.
    13 3/8
    1360.0
    17 1/2
    1365.0
    1.82
    LOT
    OPEN HOLE
    2250.0
    12 1/4
    2250.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    700
    1.24
    36.0
    water based
    1000
    1.24
    41.0
    water based
    1300
    1.25
    45.0
    water based
    1400
    1.13
    39.0
    water based
    1510
    1.22
    44.0
    water based
    1700
    1.22
    44.0
    water based
    2100
    1.22
    44.0
    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
    0.19