Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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24.11.2024 - 01:27
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31/6-5

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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.
    31/6-5
    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.
    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
    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.
    31/6-5
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    NH 8202 - 120 SP. 246
    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.
    409-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.
    67
    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,
    16.03.1984
    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.
    21.05.1984
    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.
    21.05.1986
    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.
    OIL/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.
    304.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2082.0
    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).
    2028.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    1.5
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    61
    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° 37' 6.8'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 48' 20.98'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6720730.31
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    544106.97
    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.
    105

  • Wellbore history
    General
    Well 31/6-5 was drilled in the southern part of the Troll East gas province, 30 m from well 31/6-4, which was junked for technical reasons. The main purpose was to appraise and test possible oil and gas accumulations in sandstones of Late to Middle Jurassic age, and to give further information about lateral facies changes within the reservoir sandstones.
    Operations and results
    Appraisal well 31/6-5 was spudded with the semi-submersible installation Deepsea Bergen on 5 March 1984 and drilled to TD at 2082 m in the Early Jurassic Drake Formation. In the 26" hole lost circulation occurred at 653 m, two cement plugs were set. Several wiper trips were taken due to tight hole. After setting of the 20" casing, the BOP had to be repaired due to leaking during pressure testing. A drilling break occurred at 1476 m in the 12 1/4" hole. The well was drilled with the spud mud from the previous hole (31/6-4) treated with CMC-EHV down to 389 m, with seawater/gel mud from 389 m to 663 m, with KCl/polymer mud from 663 m to 1720 m, and with seawater/gel/CMC mud from 1720 m to TD.
    Sandstone of Late to Middle Jurassic age (Sognefjord Formation) was encountered at 1518 m with a 52 m gas column and a 4 m oil column. The gas/oil contact was at 1570 m and the oil/water contact at 1574 m. Oil shows were recorded on sidewall cores on top Fensfjord Formation sandstone from 1722 m to 1726 m and on a sandstone SWC from 2010 m in the Ness Formation. Ten cores were cut from 1470 m to 1721 m in the Late to Middle Jurassic sequence (Heather Formation to Fensfjord Formation). One FMT fluid sample was taken in the oil zone 1571.5 m. Geochemical analyses showed the oil to be biodegraded.
    The well was permanently abandoned on 16 March 1984 as a gas and oil appraisal.
    Testing
    The Sognefjord Formation was tested through gravel pack from the interval 1558 m to 1568 m. The first test gave a non-representative flow due to obstructions in the hole. The second test, termed Test 1A, was ok and produced gas at a maximum rate of 1266000 Sm3/day on a 1.5" choke. Geochemical analyses showed the gas to be 92.4% methane and biodegraded.

  • 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
    2081.50

  • 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
    1470.0
    1497.3
    [m ]
    2
    1497.0
    1518.0
    [m ]
    3
    1523.0
    1550.5
    [m ]
    4
    1550.5
    1557.4
    [m ]
    5
    1557.5
    1584.0
    [m ]
    6
    1584.0
    1611.0
    [m ]
    7
    1611.0
    1637.8
    [m ]
    8
    1638.0
    1665.8
    [m ]
    9
    1665.5
    1693.5
    [m ]
    10
    1693.0
    1720.7
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    246.2
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1470-1475m
    Core photo at depth: 1475-1480m
    Core photo at depth: 1480-1485m
    Core photo at depth: 1485-1490m
    Core photo at depth: 1490-1495m
    1470-1475m
    1475-1480m
    1480-1485m
    1485-1490m
    1490-1495m
    Core photo at depth: 1495-1497m
    Core photo at depth: 1497-1502m
    Core photo at depth: 1502-1507m
    Core photo at depth: 1507-1512m
    Core photo at depth: 1512-1517m
    1495-1497m
    1497-1502m
    1502-1507m
    1507-1512m
    1512-1517m
    Core photo at depth: 1517-1518m
    Core photo at depth: 1523-1528m
    Core photo at depth: 1528-1533m
    Core photo at depth: 1533-1538m
    Core photo at depth: 1538-1543m
    1517-1518m
    1523-1528m
    1528-1533m
    1533-1538m
    1538-1543m
    Core photo at depth: 1543-1548m
    Core photo at depth: 1548-1550m
    Core photo at depth: 1550-1555m
    Core photo at depth: 1555-1557m
    Core photo at depth: 1557-1562m
    1543-1548m
    1548-1550m
    1550-1555m
    1555-1557m
    1557-1562m
    Core photo at depth: 1562-1567m
    Core photo at depth: 1567-1572m
    Core photo at depth: 1572-1577m
    Core photo at depth: 1577-1582m
    Core photo at depth: 1582-1584m
    1562-1567m
    1567-1572m
    1572-1577m
    1577-1582m
    1582-1584m
    Core photo at depth: 1584-1589m
    Core photo at depth: 1589-1594m
    Core photo at depth: 1594-1599m
    Core photo at depth: 1599-1604m
    Core photo at depth: 1604-1609m
    1584-1589m
    1589-1594m
    1594-1599m
    1599-1604m
    1604-1609m
    Core photo at depth: 1609-1611m
    Core photo at depth: 1611-1616m
    Core photo at depth: 1616-1621m
    Core photo at depth: 1621-1626m
    Core photo at depth: 1626-1631m
    1609-1611m
    1611-1616m
    1616-1621m
    1621-1626m
    1626-1631m
    Core photo at depth: 1631-1636m
    Core photo at depth: 1636-1637m
    Core photo at depth: 1638-1643m
    Core photo at depth: 1643-1648m
    Core photo at depth: 1648-1653m
    1631-1636m
    1636-1637m
    1638-1643m
    1643-1648m
    1648-1653m
    Core photo at depth: 1653-1658m
    Core photo at depth: 1658-1663m
    Core photo at depth: 1663-1665m
    Core photo at depth: 1665-1670m
    Core photo at depth: 1670-1675m
    1653-1658m
    1658-1663m
    1663-1665m
    1665-1670m
    1670-1675m
    Core photo at depth: 1675-1680m
    Core photo at depth: 1680-1685m
    Core photo at depth: 1685-1690m
    Core photo at depth: 1690-1693m
    Core photo at depth: 1693-1698m
    1675-1680m
    1680-1685m
    1685-1690m
    1690-1693m
    1693-1698m
    Core photo at depth: 1698-1703m
    Core photo at depth: 1703-1708m
    Core photo at depth: 1708-1713m
    Core photo at depth: 1713-1718m
    Core photo at depth: 1718-1720m
    1698-1703m
    1703-1708m
    1708-1713m
    1713-1718m
    1718-1720m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    690.0
    [m]
    SWC
    STATO
    752.0
    [m]
    SWC
    STATO
    790.0
    [m]
    SWC
    STATO
    850.0
    [m]
    SWC
    STATO
    890.0
    [m]
    SWC
    STATO
    930.0
    [m]
    SWC
    STATO
    1010.0
    [m]
    SWC
    STATO
    1050.0
    [m]
    SWC
    STATO
    1110.0
    [m]
    SWC
    STATO
    1130.0
    [m]
    SWC
    STATO
    1310.0
    [m]
    SWC
    STATO
    1380.0
    [m]
    SWC
    STATO
    1395.0
    [m]
    SWC
    STATO
    1400.0
    [m]
    SWC
    STATO
    1410.0
    [m]
    SWC
    STATO
    1415.0
    [m]
    SWC
    STATO
    1425.0
    [m]
    SWC
    STATO
    1430.0
    [m]
    SWC
    STATO
    1440.0
    [m]
    SWC
    STATO
    1442.0
    [m]
    SWC
    STATO
    1446.0
    [m]
    SWC
    STATO
    1452.0
    [m]
    SWC
    STATO
    1456.0
    [m]
    SWC
    STATO
    1460.0
    [m]
    SWC
    STATO
    1468.0
    [m]
    SWC
    STATO
    1473.7
    [m]
    SWC
    STATO
    1518.0
    [m]
    SWC
    STATO
    1520.0
    [m]
    SWC
    STATO
    1786.0
    [m]
    SWC
    STATO
    1821.0
    [m]
    SWC
    STATO
    1880.0
    [m]
    SWC
    STATO
    1993.0
    [m]
    SWC
    STATO
    1998.0
    [m]
    SWC
    STATO
    2036.0
    [m]
    SWC
    STATO
    2046.0
    [m]
    SWC
    STATO
    2080.0
    [m]
    SWC
    STATO

  • Oil samples at the Norwegian Offshore Directorate
    Oil samples at the Norwegian Offshore Directorate
    Test type
    Bottle number
    Top depth
    MD [m]
    Bottom depth
    MD [m]
    Fluid type
    Test time
    Samples available
    DST
    TEST1A
    1568.00
    1558.00
    15.05.1984 - 11:30
    YES

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.33

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.46
    pdf
    0.26
    pdf
    4.75

  • 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
    28.81
    pdf
    1.31
    pdf
    6.37
    pdf
    0.81
    pdf
    0.30
    pdf
    17.51
    pdf
    3.73
    pdf
    0.60
    pdf
    1.43
    pdf
    5.61
    pdf
    0.25
    pdf
    9.77
    pdf
    10.32
    pdf
    2.28
    pdf
    1.19
    pdf
    0.88
    pdf
    15.53
    pdf
    16.88
    pdf
    6.44

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    1558
    1568
    38.1
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    Drill stem tests (DST)
    Test number
    Oil
    [Sm3/day]
    Gas
    [Sm3/day]
    Oil density
    [g/cm3]
    Gas grav. rel.air
    GOR
    [m3/m3]
    1.0
    1266000

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    4-ARM DIP STRATADIP
    1424
    2081
    ACBL
    323
    1424
    CALIPER
    1493
    1534
    CDL CNL GR CAL
    1424
    2079
    CDL GR CAL
    649
    1445
    COLLARLOG
    1400
    1600
    DIFL BHC AC GR SP CAL
    389
    2082
    DLL MLL GR
    1424
    2079
    DLWD
    401
    504
    FMT
    1490
    1602
    PHOTONLOG
    1488
    1580
    SPECTRALOG
    1424
    2076
    VDL
    1150
    1705
    VELOCITY
    1000
    2080

  • 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
    389.2
    36
    390.5
    0.00
    LOT
    SURF.COND.
    20
    649.0
    26
    656.0
    1.54
    LOT
    INTERM.
    13 3/8
    1424.0
    17 1/2
    1445.0
    1.76
    LOT
    INTERM.
    9 5/8
    1706.9
    12 1/4
    1721.0
    1.62
    LOT
    OPEN HOLE
    2082.0
    8 1/2
    2082.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    430
    1.05
    40.0
    WATER BASED
    550
    1.07
    39.0
    WATER BASED
    660
    1.10
    54.0
    WATER BASED
    760
    1.22
    47.0
    WATER BASED
    1065
    1.23
    48.0
    WATER BASED
    1155
    1.22
    47.0
    WATER BASED
    1260
    1.26
    49.0
    WATER BASED
    1580
    1.22
    52.0
    WATER BASED
    1725
    1.10
    59.0
    WATER BASED

  • Thin sections at the Norwegian Offshore Directorate
    Thin sections at the Norwegian Offshore Directorate
    Depth
    Unit
    1492.55
    [m ]
    1525.35
    [m ]
    1536.50
    [m ]
    1556.50
    [m ]
    1562.35
    [m ]
    1573.15
    [m ]
    1587.10
    [m ]
    1591.40
    [m ]
    1601.75
    [m ]
    1610.50
    [m ]
    1627.50
    [m ]
    1637.90
    [m ]
    1646.73
    [m ]
    1660.00
    [m ]
    1664.00
    [m ]
    16.00
    [m ]
    1677.50
    [m ]
    1686.70
    [m ]
    1698.00
    [m ]
    1491.00
    [m ]
    1493.00
    [m ]
    1514.00
    [m ]
    1517.00
    [m ]
    1591.00
    [m ]
    1525.00
    [m ]
    1573.00
    [m ]
    1537.00
    [m ]
    1541.00
    [m ]
    1547.00
    [m ]
    1557.00
    [m ]
    1562.00
    [m ]
    1580.00
    [m ]
    1587.00
    [m ]
    1602.00
    [m ]
    1611.00
    [m ]
    1622.00
    [m ]
    1628.00
    [m ]
    1638.00
    [m ]
    1647.00
    [m ]
    1653.00
    [m ]
    1711.00
    [m ]

  • 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
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