Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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25.11.2024 - 01:30
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8/10-4 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.
    8/10-4 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).
    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
    Press release
    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.
    8/10-4
    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.
    Centrica Resources (Norge) 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.
    1366-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.
    74
    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,
    15.08.2011
    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.
    27.10.2011
    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.
    27.10.2013
    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.
    27.10.2013
    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
    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.
    YES
    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.
    ULA FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    44.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    66.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3071.0
    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).
    3058.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    11.4
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    128
    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 PERMIAN
    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.
    ZECHSTEIN GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    57° 3' 53.79'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 2' 43.41'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6324757.70
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    502752.78
    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.
    6630

  • Wellbore history
    General
    Well 8/10-4 S was drilled on the Butch prospect, a salt-induced structure on the Sørvestlandet high, approximately 13 km SE of the Ula Field in the North Sea. The objective of the well was to test the hydrocarbon potential of the Late Jurassic Ula Formation, the main prospective formation in the area.
    Operations and results
    Well 8/10-4 S was spudded with the jack-up installation Mærsk Guardian on 15 August 2011 and drilled to TD at 3071 m (3058 m TVD) in the Late Permian Zechstein Group. The well was drilled as an 'S' shaped profile to avoid a potential faulted zone in the shallow sediments, identified during the site survey. A 9 7/8" pilot hole was drilled from 227 m to 1011 m to check for shallow gas. No shallow gas was seen. No significant problem was encountered in the operations. The well was drilled with seawater and hi-vis sweeps down to 1011 m and with oil based mud from 1011 m to TD.
    The Ula Formation came in at 2947 m and was filled with oil all through down to its base at 3003 m. No OWC was found, instead the Ula reservoir was penetrated in an oil-down-to setting. Drilling continued through the Skagerrak Formation and was terminated after anhydrite was identified in cuttings returns, indicating that the Zechstein Group had been penetrated. Indications of hydrocarbons were observed only in the Ula Formation, which represents the only reservoir interval in the well.
    A total of three cores were taken in the 6" hole from 2928 m to 3028 m with 100% recovery. The third core confirmed the presence of the Skagerrak Formation. RDT wire line samples were taken at 2950 m and at 2973.5 m with oil at both levels.
    The well was plugged back and prepared for sidetrack to well 8/10-4 A on 27 October 2011. It is classified as an oil Discovery.
    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]
    230.00
    3072.00

  • 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
    2958.0
    2985.0
    [m ]
    2
    2985.0
    3003.8
    [m ]
    3
    3004.0
    3027.6
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    69.4
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • 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
    RFT
    0.00
    0.00
    YES
    RFT
    2973.50
    2950.00
    OIL
    21.10.2011 - 15:00
    YES

  • 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
    218.6
    36
    222.0
    0.00
    LOT
    SURF.COND.
    13 3/8
    1001.0
    17 1/2
    1008.0
    0.00
    LOT
    PILOT HOLE
    1011.0
    9 7/8
    1011.0
    0.00
    LOT
    INTERM.
    9 5/8
    2523.0
    12 1/4
    2531.0
    0.00
    LOT
    LINER
    7
    2896.0
    8 1/2
    2898.0
    0.00
    LOT
    OPEN HOLE
    3071.0
    6
    3071.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL CAST
    1750
    2450
    GTET DSN SDL ICT IDT WSTT ARCT
    25
    3065
    MWD - GR RES DEN SON DIR PWD
    3028
    3071
    MWD - GR RES SON DIR PWD
    2531
    2958
    RDT GR
    2919
    3002
    VSP
    600
    3050

  • Lithostratigraphy

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    226
    1.24
    10.0
    Kill / displacement mud
    989
    1.59
    39.0
    ENVIROMUL
    1011
    1.59
    39.0
    Enviromul
    2022
    1.44
    29.0
    ENVIROMUL
    2549
    1.49
    13.4
    ENVIROMUL
    2549
    1.51
    50.0
    ENVIROMUL
    2549
    1.44
    45.0
    ENVIROMUL

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2884.0
    [m]
    DC
    PETROSTR
    2890.0
    [m]
    DC
    PETROS
    2896.0
    [m]
    DC
    PETROS
    2904.0
    [m]
    DC
    PETROS
    2910.0
    [m]
    DC
    PETROS
    2916.0
    [m]
    DC
    PETROS
    2925.0
    [m]
    DC
    PETROS
    2931.0
    [m]
    DC
    PETROS
    2937.0
    [m]
    DC
    PETROS
    2943.0
    [m]
    DC
    PETROS
    2949.0
    [m]
    DC
    PETROS
    2955.0
    [m]
    DC
    PETROS
    2958.2
    [m]
    C
    PETROS
    2961.0
    [m]
    DC
    PETROS
    2965.8
    [m]
    C
    PETROS
    2967.0
    [m]
    DC
    PETROS
    2988.8
    [m]
    C
    PETROS
    2990.1
    [m]
    C
    PETROS
    2991.0
    [m]
    DC
    PETROS
    2999.2
    [m]
    C
    PETROS
    3000.6
    [m]
    C
    PETROS
    3002.3
    [m]
    C
    PETROS
    3004.0
    [m]
    DC
    PETROS
    3004.8
    [m]
    C
    PETROS
    3005.2
    [m]
    C
    PETROS
    3008.7
    [m]
    C
    PETROS
    3009.0
    [m]
    DC
    PETROS
    3009.8
    [m]
    C
    PETROS
    3012.6
    [m]
    C
    PETROS
    3015.4
    [m]
    C
    PETROS
    3017.1
    [m]
    C
    PETROS
    3017.1
    [m]
    C
    PETROS
    3018.2
    [m]
    C
    PETROS
    3019.4
    [m]
    C
    PETROS
    3023.0
    [m]
    C
    PETROS
    3027.3
    [m]
    C
    PETROS