Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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31.10.2024 - 01:27
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30/8-2

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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.
    30/8-2
    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).
    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
    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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    30/8-2
    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.
    835-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.
    31
    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,
    15.12.1995
    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.
    14.01.1996
    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.
    14.01.1998
    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.
    01.08.2010
    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
    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 SHOWS
    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.
    22.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    99.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2405.0
    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).
    2405.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    2.5
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    74
    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.
    LATE CRETACEOUS
    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.
    JORSALFARE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 27' 24.51'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 21' 47.92'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6702613.66
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    464976.31
    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.
    2723

  • Wellbore history
    General
    Well 30/8-2 was drilled in the Viking Graben of the North Sea, about mid-way between the Hild and the Oseberg Sør Fields. The objective was to test the hydrocarbon potential of the Tertiary X1 prospect. The main target was a prognosed Heimdal Formation sand within the Lista Formation. Planned TD was at 2404 m in the uppermost Cretaceous.
    Operations and results
    Wildcat well 30/8-2 was spudded with the semi-submersible installation West Vanguard on 15 December 1995 and drilled to TD at 2405 m in the Late Cretaceous Jorsalfare Formation. Indications of shallow gas was observed as low gamma and high resistivity in a thin sand layer at 386 m. No significant problems were encountered in the operations. The well was drilled with spud mud down to 1542 m and with KCl/polymer mud from 1542 m to TD.
    The prognosed Heimdal Formation was not present in the well but a sandstone rich interval assigned to the Hermod Formation was encountered. In the Hermod Formation, a total of 31 m net reservoir sand was calculated between 2075.5 m and 2137.5 m. A Petroleum Geochemistry Study of the reservoir interval indicated significant amounts of migrated hydrocarbons in the Hermod Formation. Traces of migrated hydrocarbons were detected also in thinner sands in the Balder and Våle Formations. The reservoir properties were excellent. An average porosity of approximately 30% has been calculated based on petrophysical evaluation. Permeabilities greater than 3500 mD are measured from core plugs. The hydrocarbon saturation is low and no evidence for moveable hydrocarbons was found in the log data. Fair to weak shows were recorded on cuttings from sandstones and limestone stringers from Top Balder Formation to TD, and good oil shows were recorded on sandstones in the cores.
    The interval 2129 m - 2152 m was cored (2 cores). The cores cover the lowermost part of the Hermod Formation, basal Sele Formation, and the upper part of the Lista Formation. An MDT fluid sampling at 2123.0 m recovered 9.7 l water/mud filtrate and some gas. No oil was recovered.
    The well was permanently abandoned on 14 January 1996 as a well with shows.
    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]
    1550.00
    2405.00

  • 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
    2129.0
    2133.6
    [m ]
    2
    2135.0
    2151.7
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    21.3
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 2129-2133m
    Core photo at depth: 2135-2140m
    Core photo at depth: 2140-2145m
    Core photo at depth: 2145-2150m
    Core photo at depth: 2150-2151m
    2129-2133m
    2135-2140m
    2140-2145m
    2145-2150m
    2150-2151m

  • 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
    181.0
    36
    182.0
    0.00
    LOT
    SURF.COND.
    13 3/8
    1534.0
    17 1/2
    1542.0
    0.00
    LOT
    OPEN HOLE
    2129.0
    12 1/4
    2129.0
    0.00
    LOT
    OPEN HOLE
    2405.0
    8 1/2
    2405.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CST GR
    1604
    2392
    DLL MSFL DSI NGT D SP AMS
    1534
    2399
    FMS LDL CNL GR CAL AMS
    1535
    2403
    MDT GR AMS
    2019
    2352
    VELOCITY
    880
    2400

  • Lithostratigraphy

  • 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
    9.81

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    182
    1.05
    water based
    857
    1.08
    water based
    1325
    1.42
    water based
    1542
    1.20
    water based
    1595
    1.42
    24.0
    water based
    2069
    1.42
    26.0
    water based
    2129
    1.42
    25.0
    water based
    2151
    1.42
    24.0
    water based
    2405
    1.42
    23.0
    water based

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1580.0
    [m]
    DC
    STRAT
    1604.0
    [m]
    SWC
    STRAT
    1640.0
    [m]
    DC
    STRAT
    1659.0
    [m]
    SWC
    STRAT
    1680.0
    [m]
    DC
    STRAT
    1690.0
    [m]
    DC
    STRAT
    1710.0
    [m]
    DC
    STRAT
    1720.0
    [m]
    DC
    STRAT
    1750.0
    [m]
    DC
    STRAT
    1770.0
    [m]
    DC
    STRAT
    1810.0
    [m]
    DC
    STRAT
    1823.0
    [m]
    SWC
    STRAT
    1860.0
    [m]
    DC
    STRAT
    1887.0
    [m]
    SWC
    STRAT
    1910.0
    [m]
    DC
    STRAT
    1930.0
    [m]
    SWC
    STRAT
    1950.0
    [m]
    DC
    STRAT
    1970.0
    [m]
    DC
    STRAT
    2007.0
    [m]
    SWC
    STRAT
    2019.0
    [m]
    SWC
    STRAT
    2035.0
    [m]
    DC
    STRAT
    2040.0
    [m]
    DC
    STRAT
    2048.0
    [m]
    SWC
    STRAT
    2055.0
    [m]
    DC
    STRAT
    2063.0
    [m]
    SWC
    STRAT
    2075.0
    [m]
    DC
    STRAT
    2088.0
    [m]
    SWC
    STRAT
    2105.0
    [m]
    DC
    STRAT
    2110.0
    [m]
    DC
    STRAT
    2115.0
    [m]
    DC
    STRAT
    2120.0
    [m]
    DC
    STRAT
    2125.0
    [m]
    DC
    STRAT
    2131.0
    [m]
    C
    STRAT
    2132.0
    [m]
    C
    STRAT
    2136.0
    [m]
    C
    STRAT
    2137.0
    [m]
    C
    STRAT
    2140.0
    [m]
    C
    STRAT
    2143.0
    [m]
    C
    STRAT
    2144.0
    [m]
    C
    STRAT
    2145.0
    [m]
    C
    STRAT
    2146.0
    [m]
    C
    STRAT
    2149.0
    [m]
    C
    STRAT
    2151.0
    [m]
    C
    STRAT
    2160.0
    [m]
    DC
    STRAT
    2170.0
    [m]
    DC
    STRAT
    2208.0
    [m]
    SWC
    STRAT
    2225.0
    [m]
    DC
    STRAT
    2240.0
    [m]
    DC
    STRAT
    2255.0
    [m]
    DC
    STRAT
    2270.0
    [m]
    DC
    STRAT
    2285.0
    [m]
    DC
    STRAT
    2290.0
    [m]
    DC
    STRAT
    2295.0
    [m]
    DC
    STRAT
    2300.0
    [m]
    DC
    STRAT
    2315.0
    [m]
    DC
    STRAT
    2338.0
    [m]
    SWC
    STRAT
    2352.0
    [m]
    SWC
    STRAT
    2357.0
    [m]
    SWC
    STRAT
    2367.0
    [m]
    SWC
    STRAT
    2382.0
    [m]
    SWC
    STRAT
    2395.0
    [m]
    DC
    STRAT
    2405.0
    [m]
    DC
    STRAT