Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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06.11.2024 - 01:25
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31/5-2

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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.
    31/5-2
    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
    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.
    31/5-2
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    ST 8007 - 132 SP 884
    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.
    Saga Petroleum ASA
    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.
    391-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.
    38
    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,
    05.10.1983
    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.
    11.11.1983
    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.
    11.11.1985
    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.
    18.12.2008
    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.
    26.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    316.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2500.0
    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).
    2500.0
    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.
    87
    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° 43' 33.29'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 32' 52.74'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6732542.72
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    529894.43
    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.
    32

  • Wellbore history
    General
    Well 31/5-2 is a replacement well for well 3/5-1 in the southern part of the Troll West Field. Well 31/5-1 was terminated at 860 m and junked due to an incident where the BOP and riser was lost. Due to this, the rig left the location and went to Bergen for repairs. It returned to the location five days later for drilling 31/5-2. The purpose of the well was to test the reservoir qualities, the oil/gas columns, and the hydrocarbon/water contact in the area.
    Operations and results
    Appraisal well 31/5-2 was spudded with the semi-submersible installation Treasure Saga on 5 October 1983 and was drilled to TD at 2500 m in the Late Triassic Hegre Group. A total of 5 days were lost on setting the 18 3/4" x 9 5/8" seal-assembly, otherwise no significant technical problems occurred in the operations. The well was drilled with seawater and hi-vis pills down to 860 m and with KCl/polymer mud from 860 m to TD.
    Well 31/5-2 penetrated top reservoir at 1521 m. The interval 1521 - 1569 m was gas bearing with 30% porosity and 15% water saturation. The interval from 1569 - 1582 m was oil bearing with 27% porosity and 30% water saturations. These intervals were the only hydrocarbon bearing intervals in the well. Between 1569 and 1582 m there were good shows in the cores. They showed brown oil stain, golden-yellow fluorescence and instant cloudy, milky, white cut. There was strong hydrocarbon odour.
    A total of six cores were taken in the interval 1505.0 -1599.9 m, covering the basal 16 m of the Draupne Formation and the upper 78 m of the Sognefjord Formation. The core recovery was 81%. FMT segregated fluid samples were taken at 1563 m (gas), 1575 m (oil at 135 bar), and 1581 (oil at 90 bar).
    After surveying, logging and sidewall coring, the well was plugged back to 1902 m and suspended on 11 November 1984. The well was to be re-entered at a later stage for testing.
    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]
    870.00
    2500.00

  • 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
    1505.0
    1505.5
    [m ]
    2
    1506.8
    1521.9
    [m ]
    3
    1524.8
    1542.5
    [m ]
    4
    1543.2
    1570.4
    [m ]
    5
    1570.5
    1588.3
    [m ]
    6
    1589.0
    1601.4
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    90.8
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1505-1506m
    Core photo at depth: 1506-1510m
    Core photo at depth: 1511-1515m
    Core photo at depth: 1516-1520m
    Core photo at depth: 1521-1522m
    1505-1506m
    1506-1510m
    1511-1515m
    1516-1520m
    1521-1522m
    Core photo at depth: 1524-1529m
    Core photo at depth: 1529-1534m
    Core photo at depth: 1534-1539m
    Core photo at depth: 1539-1542m
    Core photo at depth: 1543-1547m
    1524-1529m
    1529-1534m
    1534-1539m
    1539-1542m
    1543-1547m
    Core photo at depth: 1548-1553m
    Core photo at depth: 1553-1558m
    Core photo at depth: 1558-1563m
    Core photo at depth: 1563-1568m
    Core photo at depth: 1568-1570m
    1548-1553m
    1553-1558m
    1558-1563m
    1563-1568m
    1568-1570m
    Core photo at depth: 1570-1575m
    Core photo at depth: 1575-1580m
    Core photo at depth: 1580-1585m
    Core photo at depth: 1585-1588m
    Core photo at depth: 1589-1594m
    1570-1575m
    1575-1580m
    1580-1585m
    1585-1588m
    1589-1594m
    Core photo at depth: 1594-1599m
    Core photo at depth: 1599-1601m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    1594-1599m
    1599-1601m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    965.0
    [m]
    SWC
    IKU
    1182.0
    [m]
    SWC
    IKU
    1220.0
    [m]
    SWC
    IKU
    1250.0
    [m]
    SWC
    IKU
    1280.0
    [m]
    SWC
    IKU
    1290.0
    [m]
    SWC
    IKU
    1307.5
    [m]
    SWC
    IKU
    1421.5
    [m]
    SWC
    IKU
    1438.0
    [m]
    SWC
    IKU
    1465.0
    [m]
    SWC
    IKU
    1480.0
    [m]
    SWC
    IKU
    1485.0
    [m]
    SWC
    IKU
    1492.0
    [m]
    SWC
    IKU
    1499.0
    [m]
    SWC
    IKU
    1502.0
    [m]
    SWC
    IKU
    1604.0
    [m]
    SWC
    IKU
    1615.0
    [m]
    SWC
    IKU
    1633.0
    [m]
    SWC
    IKU
    1637.0
    [m]
    SWC
    IKU
    1645.0
    [m]
    SWC
    IKU
    1653.0
    [m]
    SWC
    IKU
    1665.0
    [m]
    SWC
    IKU
    1673.0
    [m]
    SWC
    IKU
    1682.0
    [m]
    SWC
    IKU
    1687.0
    [m]
    SWC
    IKU
    1693.0
    [m]
    SWC
    IKU
    1708.0
    [m]
    SWC
    IKU
    1717.0
    [m]
    SWC
    IKU
    1727.0
    [m]
    SWC
    IKU
    1737.0
    [m]
    SWC
    IKU
    1748.0
    [m]
    SWC
    IKU
    1753.0
    [m]
    SWC
    IKU
    1763.0
    [m]
    SWC
    IKU
    1774.0
    [m]
    SWC
    IKU
    1795.0
    [m]
    SWC
    IKU
    1806.0
    [m]
    SWC
    IKU
    1822.0
    [m]
    SWC
    IKU
    1825.0
    [m]
    SWC
    IKU
    1838.0
    [m]
    SWC
    IKU
    1853.0
    [m]
    SWC
    IKU
    1869.0
    [m]
    SWC
    IKU
    1874.0
    [m]
    SWC
    IKU
    1910.0
    [m]
    SWC
    IKU
    1917.0
    [m]
    SWC
    IKU
    1920.0
    [m]
    SWC
    IKU
    1935.0
    [m]
    SWC
    IKU
    1940.0
    [m]
    SWC
    IKU
    1948.0
    [m]
    SWC
    IKU
    1977.0
    [m]
    SWC
    IKU
    1982.0
    [m]
    SWC
    IKU
    1986.5
    [m]
    SWC
    IKU
    2011.0
    [m]
    SWC
    IKU
    2039.0
    [m]
    SWC
    IKU
    2053.0
    [m]
    SWC
    IKU
    2107.0
    [m]
    SWC
    IKU
    2115.0
    [m]
    SWC
    IKU
    2126.0
    [m]
    SWC
    IKU
    2135.0
    [m]
    SWC
    IKU
    2144.0
    [m]
    SWC
    IKU
    2153.0
    [m]
    SWC
    IKU
    2163.0
    [m]
    SWC
    IKU
    2171.0
    [m]
    SWC
    IKU
    2175.0
    [m]
    SWC
    IKU
    2186.0
    [m]
    SWC
    IKU
    2197.0
    [m]
    SWC
    IKU
    2205.0
    [m]
    SWC
    IKU
    2230.0
    [m]
    SWC
    IKU
    2333.0
    [m]
    SWC
    IKU
    2340.0
    [m]
    SWC
    IKU
    2358.0
    [m]
    SWC
    IKU
    2369.0
    [m]
    SWC
    IKU

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.58
    pdf
    0.33
    pdf
    3.50

  • 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
    17.02
    pdf
    3.90

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    ACBL
    793
    1428
    ACBL
    1250
    1965
    CDL CNL GR CAL
    848
    2492
    DIFL BHC LSBHC ACL GR
    848
    2495
    DLL MLL GR
    1415
    1962
    FMT
    1415
    1964
    FMT
    1952
    2498
    HRD
    1415
    2488
    SPECTRALOG
    1415
    1955
    TEMP
    821
    1382

  • 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
    415.0
    36
    418.0
    0.00
    LOT
    SURF.COND.
    20
    848.0
    26
    860.0
    1.53
    LOT
    INTERM.
    13 3/8
    1415.0
    17 1/2
    1430.0
    1.63
    LOT
    INTERM.
    9 5/8
    1952.0
    12 1/4
    1965.0
    1.63
    LOT
    OPEN HOLE
    2500.0
    8 1/2
    2500.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    894
    1.10
    17.0
    19.0
    WATER BASED
    1277
    1.34
    20.0
    20.0
    WATER BASED
    1435
    1.27
    16.0
    19.0
    WATER BASED
    2008
    1.23
    13.0
    16.0
    WATER BASED
    2088
    1.21
    14.0
    16.0
    WATER BASED
    2350
    1.17
    13.0
    16.0
    WATER BASED
    2467
    1.20
    11.0
    11.0
    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
    0.22