Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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22.11.2024 - 09:09
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31/5-4 S

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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.
    31/5-4 S
    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
    Multilateral
    Indicator telling if the parent well is multilateral, meaning it has more than one branch radiating from the main borehole. Example of legal values: YES, NO. See also Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    NO
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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.
    31/5-4
    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.
    650-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.
    28
    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,
    13.09.1990
    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.
    10.10.1990
    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.
    10.10.1992
    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
    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.
    24.0
    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).
    1909.0
    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).
    1706.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    53
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    57
    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.
    MIDDLE 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.
    FENSFJORD FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 43' 16.19'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 33' 43.06'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6732020.10
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    530661.48
    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.
    1669

  • Wellbore history
    General
    Well 31/5-4 S was drilled in a southern, down flank compartment of the Troll West Gas province, 1000 m north west of well 31/5-2. The Troll West Province is an easterly rotated fault block where the southern part is approximately 10 x 15 km with a general dip of 1 to 2 degrees at reservoir level. The primary objective was to provide a penetration hole for a later test production in a horizontal side track hole in the 13 m oil layer in the Sognefjord Formation. The test production should confirm the oil production potential from the Troll West Gas Province; obtain dynamic data from a potential development type well and obtain static reservoir and geological data to provide proper understanding of well behaviour.
    Operations and results
    Well 31/5-4 S was spudded with the semi-submersible installation Transocean 8 on 13 September 1990 and drilled to TD at 1909 m in the Middle Jurassic Fensfjord Formation. No shallow gas was encountered, as prognosed. The well was drilled vertical down to 1040 m from where angle was built up to 53 deg at 1571 m. Tight hole problems were experienced at several depths, and at 1360 m the hole packed off and mud return was temporary lost. The well was drilled with seawater and hi-vis pills down to 940 m and with KCl/polymer polyacrylamide mud from 940 m to TD.
    The Sognefjord Formation was penetrated from 1619 m (1535.4 m TVD RKB) to 1830 m (1660 m TVD RB). The formation was gas filled down to 1670 m (1535.4 m TVD RKB) and oil filled from there down to 1692.3 m (1567.2 m TVD RKB).
    The well bore was plugged back to 1496 m for sidetracking. It was permanently abandoned on 10 October 1990 as a gas and oil appraisal well.
    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]
    950.00
    1905.00

  • 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
    1647.5
    1647.8
    [m ]
    2
    1649.5
    1649.7
    [m ]
    3
    1650.0
    1667.5
    [m ]
    4
    1667.0
    1672.4
    [m ]
    5
    1674.9
    1685.0
    [m ]
    6
    1685.0
    1703.0
    [m ]
    7
    1703.0
    1708.6
    [m ]
    8
    1716.4
    1731.2
    [m ]
    9
    1731.2
    1747.3
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    88.0
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1647-1649m
    Core photo at depth: 1650-1655m
    Core photo at depth: 1655-1660m
    Core photo at depth: 1660-1665m
    Core photo at depth: 1665-1668m
    1647-1649m
    1650-1655m
    1655-1660m
    1660-1665m
    1665-1668m
    Core photo at depth: 1668-1672m
    Core photo at depth: 1647-1679m
    Core photo at depth: 1679-1684m
    Core photo at depth: 1684-1685m
    Core photo at depth: 1685-1690m
    1668-1672m
    1647-1679m
    1679-1684m
    1684-1685m
    1685-1690m
    Core photo at depth: 1690-1695m
    Core photo at depth: 1695-1700m
    Core photo at depth: 1700-1703m
    Core photo at depth: 1703-1708m
    Core photo at depth: 1708-1719m
    1690-1695m
    1695-1700m
    1700-1703m
    1703-1708m
    1708-1719m
    Core photo at depth: 1719-1724m
    Core photo at depth: 1724-1729m
    Core photo at depth: 1729-1731m
    Core photo at depth: 1731-1736m
    Core photo at depth: 1736-1741m
    1719-1724m
    1724-1729m
    1729-1731m
    1731-1736m
    1736-1741m
    Core photo at depth: 1741-1746m
    Core photo at depth: 1746-1747m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    1741-1746m
    1746-1747m

  • 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
    424.0
    36
    425.0
    0.00
    LOT
    INTERM.
    18 5/8
    924.0
    24
    926.0
    1.45
    LOT
    INTERM.
    13 3/8
    1567.0
    17 1/2
    1570.0
    1.40
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL GR CCL
    1248
    1565
    DLL MSFL SDT GR
    1567
    1904
    GCT CCL
    339
    1557
    LDL CNL GR CAL
    1567
    1879
    MWD - CDR CDN GR DIR
    1567
    1900
    MWD - CDR GR RES
    432
    1900
    SHDT
    1567
    1881
    VSP
    1250
    1870

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.17

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    376
    1.05
    20.0
    19.0
    WATER BASED
    14.09.1990
    425
    1.05
    20.0
    19.0
    WATER BASED
    17.09.1990
    425
    1.05
    20.0
    19.0
    WATER BASED
    17.09.1990
    710
    1.05
    20.0
    19.0
    WATER BASED
    17.09.1990
    943
    1.05
    20.0
    19.0
    WATER BASED
    18.09.1990
    943
    1.30
    WATER BASED
    19.09.1990
    943
    1.05
    WATER BASED
    20.09.1990
    943
    1.05
    WATER BASED
    21.09.1990
    943
    1.35
    18.0
    13.0
    WATER BASED
    24.09.1990
    943
    1.31
    19.0
    13.0
    WATER BASED
    24.09.1990
    1005
    1.31
    14.0
    12.0
    WATER BASED
    24.09.1990
    1261
    1.32
    17.0
    11.0
    WATER BASED
    25.09.1990
    1440
    1.32
    19.0
    12.0
    WATER BASED
    26.09.1990
    1508
    1.25
    17.0
    12.0
    WATER BASED
    02.10.1990
    1529
    1.32
    20.0
    14.0
    WATER BASED
    27.09.1990
    1569
    1.24
    31.0
    14.0
    OIL BASED
    12.10.1990
    1571
    1.32
    20.0
    14.0
    WATER BASED
    28.09.1990
    1571
    1.26
    17.0
    12.0
    WATER BASED
    02.10.1990
    1575
    1.26
    29.0
    12.0
    OIL BASED
    15.10.1990
    1648
    1.25
    20.0
    14.0
    WATER BASED
    02.10.1990
    1659
    1.25
    29.0
    11.0
    OIL BASED
    15.10.1990
    1728
    1.25
    28.0
    12.0
    OIL BASED
    15.10.1990
    1803
    1.25
    31.0
    12.0
    OIL BASED
    22.10.1990
    1803
    1.25
    32.0
    15.0
    OIL BASED
    16.10.1990
    1803
    1.25
    31.0
    12.0
    OIL BASED
    18.10.1990
    1803
    1.25
    31.0
    12.0
    OIL BASED
    18.10.1990
    1803
    1.25
    32.0
    10.0
    OIL BASED
    22.10.1990
    1803
    1.26
    34.0
    10.0
    OIL BASED
    22.10.1990
    1803
    1.15
    9.0
    8.0
    WATER BASED
    22.10.1990
    1805
    1.25
    11.0
    11.0
    WATER BASED
    23.10.1990
    1805
    1.25
    9.0
    10.0
    WATER BASED
    24.10.1990
    1805
    1.25
    10.0
    10.0
    WATER BASED
    25.10.1990
    1809
    1.25
    10.0
    11.0
    WATER BASED
    29.10.1990
    1811
    1.25
    10.0
    11.0
    WATER BASED
    26.10.1990
    1865
    1.25
    20.0
    13.0
    WATER BASED
    09.10.1990
    1879
    1.25
    20.0
    15.0
    WATER BASED
    09.10.1990
    1908
    1.24
    19.0
    15.0
    WATER BASED
    09.10.1990
    1908
    1.25
    20.0
    15.0
    WATER BASED
    10.10.1990
    1959
    1.25
    11.0
    13.0
    WATER BASED
    29.10.1990
    2025
    1.25
    11.0
    13.0
    WATER BASED
    29.10.1990
    2089
    1.25
    13.0
    14.0
    WATER BASED
    30.10.1990
    2133
    1.25
    13.0
    13.0
    WATER BASED
    31.10.1990
    2227
    1.25
    14.0
    15.0
    WATER BASED
    01.11.1990
    2366
    1.25
    13.0
    15.0
    WATER BASED
    02.11.1990
    2518
    1.25
    14.0
    15.0
    WATER BASED
    05.11.1990
    2585
    1.20
    2.0
    WATER BASED
    22.11.1990
    2601
    1.25
    11.0
    11.0
    WATER BASED
    13.11.1990
    2601
    1.20
    2.0
    WATER BASED
    19.11.1990
    2601
    1.20
    2.0
    WATER BASED
    20.11.1990
    2601
    1.25
    13.0
    13.0
    WATER BASED
    08.11.1990
    2601
    1.25
    11.0
    11.0
    WATER BASED
    09.11.1990
    2601
    1.20
    WATER BASED
    13.11.1990
    2601
    1.20
    2.0
    WATER BASED
    13.11.1990
    2601
    1.19
    2.0
    WATER BASED
    16.11.1990
    2601
    1.20
    2.0
    WATER BASED
    19.11.1990
    2601
    1.20
    2.0
    WATER BASED
    19.11.1990
    2601
    1.20
    2.0
    WATER BASED
    21.11.1990
    2603
    1.25
    14.0
    15.0
    WATER BASED
    05.11.1990
    2603
    1.25
    13.0
    15.0
    WATER BASED
    05.11.1990
    2603
    1.25
    13.0
    14.0
    WATER BASED
    06.11.1990
    2603
    1.25
    13.0
    14.0
    WATER BASED
    08.11.1990
    2603
    1.25
    10.0
    6.0
    WATER BASED
    10.07.1991
    2603
    1.25
    10.0
    8.0
    WATER BASED
    15.07.1991
    2603
    1.25
    10.0
    8.0
    WATER BASED
    16.07.1991
    2603
    1.25
    10.0
    8.0
    WATER BASED
    16.07.1991
    2603
    1.25
    10.0
    8.0
    WATER BASED
    16.07.1991
    2603
    1.25
    10.0
    8.0
    WATER BASED
    17.07.1991
    2603
    1.25
    10.0
    8.0
    WATER BASED
    18.07.1991