Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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14.07.2024 - 01:28
Time of last synchronization with Norwegian Offshore Directorate's internal systems

31/6-8

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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.
    31/6-8
    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
    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.
    31/6-8
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    NH 8202 - 338 SP. 249
    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.
    462-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.
    42
    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,
    14.04.1985
    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.
    25.05.1985
    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.
    25.05.1987
    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.
    25.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    300.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2138.0
    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).
    2138.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    2
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    79
    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.
    COOK FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 33' 21.36'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 40' 39.07'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6713676.33
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    537156.05
    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.
    466
  • Wellbore history

    General
    Appraisal well 31/6-8 was drilled in the south-west corner of the Troll East gas province, 50 m due north of well 31/6-7, which was junked and abandoned for technical reasons. The main objectives were to determine the lateral extent of the reservoir, to determine the fluid contacts in the Sognefjord Formation, and to obtain the best possible seismic correlation within the reservoir from well 31/6-1. In addition, an elaborate testing program was planned to obtain a number of reservoir engineering parameters.
    Operations and results
    Well 31/6-8 was spudded with the semi-submersible installation Treasure Seeker on 14 April 1985 and drilled to TD at Drilling the well proceeded without significant problems. The interval down to setting depth for 20" casing was not logged, as this interval was considered covered by logs from well 31/6-7. The well was drilled with spud mud down to 700 m, with KCl Polymer mud from 700 m to 1465 m, and with "drill in fluid" (NaCl, polymers, and CaCO3) from 1465 m to TD. An 8 m3 Imcospot/Pipelax pill was spotted at 2054 m to free the pipe, which was stuck.
    The Sognefjord Formation (1507-1661 m) was found gas bearing from 1507 m to 1573.5 m and oil bearing from 1573.5 to 1578.5 m where the oil/water contact was found. The oil zone was determined from petrophysical evaluation, core plug saturations and segregated sample recoveries. The hydrocarbon-bearing reservoir consisted of predominantly very fine to fine grained sandstones with some interbedded siltstones. The gross hydrocarbon column was 71.5 m and the net pay calculated to 67 m with an average porosity of 33% and average water saturation of 16.2 %. No hydrocarbon indications were recorded above 1507 m or below 1579 m.
    Twelve cores were cut in the Late to Middle Jurassic Sognefjord and Heather Formations from 1489 m to 1700 m (148 m total recovery). FMT segregated samples were taken at 1573.2 m (0.7 Sm3 gas, 0.5 l water/filtrate, and 6 l oil in 2.75 gallon chamber) and at 1578.8 m (0.1 Sm3 gas, 0.5 l oil, and 9.8 l water/filtrate in 2.75 gallon chamber).
    The well was temporarily suspended 25 may 1985, and subsequently re-entered for testing 20 July 1985.
    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
    2137.00
  • 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
    2
    1503.0
    1512.0
    [m ]
    3
    1520.0
    1530.0
    [m ]
    4
    1537.0
    1551.0
    [m ]
    5
    1555.0
    1566.0
    [m ]
    6
    1567.5
    1586.0
    [m ]
    7
    1586.0
    1604.0
    [m ]
    8
    1604.5
    1623.0
    [m ]
    9
    1623.0
    1641.0
    [m ]
    10
    1641.5
    1659.0
    [m ]
    11
    1663.0
    1673.0
    [m ]
    12
    1681.5
    1699.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    162.0
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 1503-1508m
    Core photo at depth: 1508-1513m
    Core photo at depth: 1513-1514m
    Core photo at depth: 1520-1525m
    Core photo at depth: 1525-1530m
    1503-1508m
    1508-1513m
    1513-1514m
    1520-1525m
    1525-1530m
    Core photo at depth: 1537-1542m
    Core photo at depth: 1542-1547m
    Core photo at depth: 1547-1551m
    Core photo at depth: 1560-1565m
    Core photo at depth: 1555-1560m
    1537-1542m
    1542-1547m
    1547-1551m
    1560-1565m
    1555-1560m
    Core photo at depth: 1565-1566m
    Core photo at depth: 1567-1572m
    Core photo at depth: 1572-1577m
    Core photo at depth: 1577-1582m
    Core photo at depth: 1582-1586m
    1565-1566m
    1567-1572m
    1572-1577m
    1577-1582m
    1582-1586m
    Core photo at depth: 1586-1591m
    Core photo at depth: 1591-1596m
    Core photo at depth: 1596-1601m
    Core photo at depth: 1601-1604m
    Core photo at depth: 1604-1609m
    1586-1591m
    1591-1596m
    1596-1601m
    1601-1604m
    1604-1609m
    Core photo at depth: 1609-1614m
    Core photo at depth: 1614-1619m
    Core photo at depth: 1619-1623m
    Core photo at depth: 1623-1628m
    Core photo at depth: 1628-1633m
    1609-1614m
    1614-1619m
    1619-1623m
    1623-1628m
    1628-1633m
    Core photo at depth: 1633-1638m
    Core photo at depth: 1638-1641m
    Core photo at depth: 1641-1646m
    Core photo at depth: 1646-1651m
    Core photo at depth: 1651-1656m
    1633-1638m
    1638-1641m
    1641-1646m
    1646-1651m
    1651-1656m
    Core photo at depth: 1656-1659m
    Core photo at depth: 1663-1669m
    Core photo at depth: 1669-1673m
    Core photo at depth: 1681-1687m
    Core photo at depth: 1687-1693m
    1656-1659m
    1663-1669m
    1669-1673m
    1681-1687m
    1687-1693m
    Core photo at depth: 1693-1699m
    Core photo at depth: 1699-1700m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    1693-1699m
    1699-1700m
  • Lithostratigraphy

  • Composite logs

    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.30
  • 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
    29.32
    pdf
    3.67
    pdf
    0.76
    pdf
    2.42
  • Drill stem tests (DST)

    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    1538
    1558
    23.8
    2.0
    1523
    1523
    0.0
    3.0
    1416
    1418
    0.0
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    2.0
    3.0
    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
    26000
    2.0
    3.0
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL CCL GR
    1200
    1596
    CET GR
    1200
    1596
    CST
    750
    1442
    CST
    1446
    1659
    CST
    1662
    2124
    DLL MSFL GR CAL
    1437
    1655
    HDT
    1100
    1442
    ISF LSS GR SP
    687
    2140
    LDL CNL GR CAL
    687
    1442
    LDL CNL NGS GR CAL
    1437
    2142
    RFT
    1487
    1640
    RFT
    1559
    1578
    SHDT
    1437
    1659
    SHDT
    1647
    2142
    TEMP
    400
    1400
    VELOCITY
    687
    2140
  • 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
    411.0
    36
    416.0
    0.00
    LOT
    SURF.COND.
    20
    687.0
    26
    700.0
    1.54
    LOT
    INTERM.
    13 3/8
    1437.0
    17 1/2
    1465.0
    1.59
    LOT
    INTERM.
    9 5/8
    1646.0
    12 1/4
    1660.0
    1.57
    LOT
    OPEN HOLE
    2138.0
    8 1/2
    2138.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    416
    1.35
    WATER BASED
    16.04.1985
    700
    1.08
    10.0
    20.0
    WATER BASED
    17.04.1985
    700
    1.10
    6.0
    13.0
    WATER BASED
    18.04.1985
    700
    0.00
    WATER BASED
    19.04.1985
    700
    1.20
    28.0
    18.0
    WATER BASED
    21.04.1985
    700
    1.20
    18.0
    7.0
    WATER BASED
    21.04.1985
    700
    1.10
    6.0
    13.0
    WATER BASED
    18.04.1985
    700
    1.20
    28.0
    18.0
    WATER BASED
    21.04.1985
    700
    1.20
    18.0
    7.0
    WATER BASED
    21.04.1985
    700
    1.20
    18.0
    7.0
    WATER BASED
    23.04.1985
    700
    1.20
    18.0
    7.0
    WATER BASED
    23.04.1985
    860
    1.20
    19.0
    8.0
    WATER BASED
    25.04.1985
    946
    1.16
    WATER BASED
    21.08.1985
    1083
    1.27
    18.0
    5.0
    WATER BASED
    26.04.1985
    1083
    1.27
    18.0
    6.0
    WATER BASED
    25.04.1985
    1083
    1.27
    18.0
    5.0
    WATER BASED
    26.04.1985
    1171
    1.24
    18.0
    9.5
    WATER BASED
    29.04.1985
    1185
    1.16
    WATER BASED
    21.08.1985
    1221
    1.24
    16.0
    7.0
    WATER BASED
    29.04.1985
    1221
    1.23
    16.0
    8.0
    WATER BASED
    30.04.1985
    1221
    1.24
    17.0
    8.0
    WATER BASED
    29.04.1985
    1221
    1.24
    16.0
    7.0
    WATER BASED
    29.04.1985
    1221
    1.23
    16.0
    8.0
    WATER BASED
    30.04.1985
    1354
    1.23
    15.0
    11.0
    WATER BASED
    02.05.1985
    1465
    1.25
    18.0
    12.0
    WATER BASED
    02.05.1985
    1465
    1.25
    19.0
    12.0
    WATER BASED
    06.05.1985
    1465
    1.25
    19.0
    11.0
    WATER BASED
    06.05.1985
    1465
    1.26
    22.0
    10.0
    WATER BASED
    06.05.1985
    1465
    1.25
    19.0
    12.0
    WATER BASED
    06.05.1985
    1465
    1.25
    19.0
    11.0
    WATER BASED
    06.05.1985
    1465
    1.26
    22.0
    10.0
    WATER BASED
    06.05.1985
    1482
    1.16
    WATER BASED
    21.08.1985
    1482
    1.16
    WATER BASED
    22.08.1985
    1482
    1.16
    WATER BASED
    29.08.1985
    1482
    1.16
    WATER BASED
    14.08.1985
    1482
    1.16
    WATER BASED
    19.08.1985
    1489
    1.20
    10.0
    8.0
    WATER BASED
    07.05.1985
    1504
    1.20
    15.0
    10.0
    WATER BASED
    08.05.1985
    1512
    1.16
    WATER BASED
    05.09.1985
    1512
    1.16
    WATER BASED
    06.09.1985
    1512
    1.16
    WATER BASED
    09.09.1985
    1537
    1.20
    25.0
    14.0
    WATER BASED
    09.05.1985
    1562
    1.16
    WATER BASED
    29.08.1985
    1562
    1.16
    WATER BASED
    30.08.1985
    1562
    1.16
    WATER BASED
    03.09.1985
    1567
    1.20
    49.0
    12.0
    WATER BASED
    10.05.1985
    1570
    1.16
    15.0
    14.0
    WATER BASED
    11.09.1985
    1580
    0.00
    WATER BASED
    23.05.1985
    1605
    1.20
    13.0
    8.0
    WATER BASED
    13.05.1985
    1615
    1.20
    9.0
    5.0
    WATER BASED
    26.07.1985
    1615
    1.20
    9.0
    5.0
    WATER BASED
    30.07.1985
    1615
    1.03
    WATER BASED
    30.07.1985
    1615
    1.03
    WATER BASED
    31.07.1985
    1615
    1.16
    WATER BASED
    02.08.1985
    1615
    1.16
    WATER BASED
    06.08.1985
    1615
    1.20
    9.0
    5.0
    WATER BASED
    30.07.1985
    1615
    1.03
    WATER BASED
    30.07.1985
    1615
    1.03
    WATER BASED
    31.07.1985
    1615
    1.16
    WATER BASED
    02.08.1985
    1615
    1.16
    WATER BASED
    06.08.1985
    1619
    1.16
    WATER BASED
    08.08.1985
    1619
    1.16
    WATER BASED
    09.08.1985
    1619
    1.16
    WATER BASED
    13.08.1985
    1619
    1.16
    WATER BASED
    08.08.1985
    1619
    1.16
    WATER BASED
    09.08.1985
    1619
    1.16
    WATER BASED
    13.08.1985
    1619
    1.16
    WATER BASED
    06.08.1985
    1641
    1.20
    13.0
    8.0
    WATER BASED
    13.05.1985
    1660
    1.20
    13.0
    8.0
    WATER BASED
    13.05.1985
    1660
    1.20
    11.0
    9.0
    WATER BASED
    14.05.1985
    1660
    1.20
    13.0
    7.0
    WATER BASED
    15.05.1985
    1660
    1.20
    13.0
    8.0
    WATER BASED
    21.05.1985
    1660
    1.20
    13.0
    7.0
    WATER BASED
    15.05.1985
    1660
    1.20
    13.0
    8.0
    WATER BASED
    21.05.1985
    1660
    1.20
    11.0
    9.0
    WATER BASED
    14.05.1985
    1663
    1.20
    13.0
    7.0
    WATER BASED
    21.05.1985
    1689
    1.20
    13.0
    8.0
    WATER BASED
    21.05.1985
    1871
    1.20
    15.0
    10.0
    WATER BASED
    21.05.1985
    2059
    1.20
    15.0
    8.0
    WATER BASED
    21.05.1985
    2138
    0.00
    25.07.1985
    2138
    1.20
    26.07.1985
    2138
    1.20
    14.0
    9.0
    WATER BASED
    22.05.1985
    2138
    1.20
    26.07.1985
    2138
    1.20
    14.0
    9.0
    WATER BASED
    21.05.1985
    2138
    1.20
    14.0
    9.0
    WATER BASED
    22.05.1985
  • 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
    0.20