Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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23.07.2024 - 01:26
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6507/8-8

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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.
    6507/8-8
    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).
    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
    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.
    NORWEGIAN SEA
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    6507/8-8
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    ST08M07 inline 10376 & xline 10706
    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.
    Nexen Exploration 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.
    1338-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.
    54
    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,
    26.02.2011
    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.
    20.04.2011
    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.
    14.11.2012
    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.
    14.11.2012
    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
    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.
    DRY
    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.
    29.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    329.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2554.0
    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).
    2554.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    2.7
    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.
    ÅRE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    65° 16' 52.5'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    7° 25' 27.66'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    7240899.97
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    426482.01
    UTM zone
    Universal Transverse Mercator zone. Examples of legal values: 31, 32, 33, 34.
    32
    NPDID wellbore
    Norwegian Offshore Directorate's unique id for the wellbore.
    6538
  • Wellbore history

    General
    Well 6507/8-8 was drilled on the Ronaldo prospect ca 5 km south-east of the Heidrun Field in the Norwegian Sea. Ronaldo was mapped as an eroded, elongated horst block with reservoir in the Early Jurassic. The primary objective was to test the hydrocarbon potential in the Early Jurassic Tilje and Åre Formations.
    Operations and results
    Wildcat well 6507/8-8 was drilled with the semi-submersible installation Songa Delta. Due to boulders and shallow gas the hole was spudded twice before 6507/8-8 was successfully spudded in the third attempt on 26 February 2011 and drilled to TD at 2554 m in the Early Jurassic Åre Formation, coal unit. No significant problem was encountered in the operations. The well was drilled with Seawater down to 540 m, with KCl/polymer mud from 540 m to 1024 m, and with Aqua-Drill mud from 1024 m to TD.
    The stratigraphy, structure, reservoir thickness and quality were all found to be in good agreement with pre-drill predictions. The Late Cretaceous Kvitnos Formation rested directly on eroded Ror Formation at 2125 m. All reservoirs were water bearing. The only oil show in the well was recorded in a thin sandstone at 2111 m towards base Cretaceous in the Kvitnos Formation. Background gas levels were relatively high throughout the Cretaceous and Jurassic stratigraphic intervals. This gas had an abundance of C2 - C5components.
    Due to dry hole no cores were cut, no wire line logs were run, and no wire line fluid samples were taken.
    The well was permanently abandoned on 20 April 2011 as a dry 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]
    420.00
    2554.00
  • Palynological slides at the Norwegian Offshore Directorate

    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1930.0
    [m]
    DC
    PETROSTR
    1940.0
    [m]
    DC
    PETROS
    1950.0
    [m]
    DC
    PETROS
    1960.0
    [m]
    DC
    PETROS
    1970.0
    [m]
    DC
    PETROS
    1980.0
    [m]
    DC
    PETROS
    1990.0
    [m]
    DC
    PETROS
    2003.0
    [m]
    DC
    PETROS
    2012.0
    [m]
    DC
    PETROS
    2024.0
    [m]
    DC
    PETROS
    2033.0
    [m]
    DC
    PETROS
    2039.0
    [m]
    DC
    PETROS
  • Lithostratigraphy

    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    358
    358
    1428
    1752
    1752
    1934
    1934
    1982
    2010
    2010
    2040
    2096
    2125
    2125
    2151
    2327
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    LWD - DIR
    358
    414
    LWD - DIR ECD VSS
    415
    553
    LWD - GR RES ECD F-OFF VSS DIR
    358
    553
    LWD - GR RES ECD F-OFF VSS DIR
    553
    1062
    LWD - RES ECD GR DIR AC
    1062
    2100
    LWD - RES ECD GR DIR DEN NEU AC
    2100
    2554
  • 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
    413.0
    36
    414.5
    0.00
    LOT
    SURF.COND.
    20
    547.0
    26
    553.0
    1.28
    LOT
    PILOT HOLE
    553.0
    9 5/8
    553.0
    0.00
    LOT
    INTERM.
    16
    1032.0
    20
    1062.0
    0.00
    LOT
    INTERM.
    13 3/8
    1940.0
    17
    1946.0
    1.65
    LOT
    INTERM.
    9 5/8
    2097.0
    12 1/4
    2100.0
    1.60
    LOT
    OPEN HOLE
    2554.0
    8 1/2
    2554.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    553
    1.49
    35.0
    Kill mud
    670
    1.14
    15.0
    KCL/Polymer
    1062
    1.15
    18.0
    KCL/Polymer