Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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21.11.2024 - 01:28
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6305/9-2

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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.
    6305/9-2
    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
    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.
    6305/9-2
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    2D Seismic line 20a-SP1342.inline 1159 & crossline 3357
    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.
    Det norske oljeselskap 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.
    1332-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.
    78
    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,
    26.12.2010
    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.
    13.03.2011
    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.
    40.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    274.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3075.0
    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).
    3075.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    1.3
    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.
    SPRINGAR FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    63° 26' 51.86'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    5° 54' 53.37'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    7038957.15
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    645347.27
    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.
    6502

  • Wellbore history
    General
    The exploration well 6305/9-2 is located in the northern part of block 6305/9, 25 km east of the Ormen Lange field. The main objective was to test the presence of hydrocarbons in the Dovregubben prospect, in the Palaeocene Tang Formation channel sandstones. Secondary prospects were identified in the Paleocene Egga Formation and in the Late Cretaceous Springar Formation.
    Operations and results
    Wildcat well 6305/9-2 was spudded with the semi-submersible installation Aker Barents on 26 December 2010 and drilled to TD at 3075 m in the Late Cretaceous Springar Formation. After the 36" section a 9 7/8" pilot hole was drilled from 381 m to 496 m using seawater and hi-vis pills to check for shallow gas. Shallow gas was detected in a sandy interval from 484 m to 486 m. The pilot was cemented and opened up/drilled with 26" BHA down to 477 m where 20" casing was set, shallower than planned due to the shallow gas. While drilling the succeeding 17 1/2" section gas peaks (drilled gas) were recorded at 485 m (2.8%), 577 m (2.7%) and 636 m (2.4%) in sandy intervals. The well took significantly longer time than planned. The main causes for this was hole problems (134.5 hrs) and WOW (472.5 hrs, of which 386.5 hrs occurred after pulling riser and BOP, before final anchor handling and abandonment). The well was drilled with seawater and bentonite down to 477 m, with seawater and polymer mud from 477 m to 671 m, and with Glydril mud (3.5 - 5.1% glycol) from 671 m to TD.
    The geology and the depth prognosis of the well came in very much as prognosed. The Tang Formation sandstones were thinner than expected, and with poorer reservoir quality. The secondary targets contained Egga Formation reservoir and thin Springar Formation sand units with reservoir properties as expected. Wire line logs proved generally poor reservoir quality, though porosities as high as 25% were seen in thin intervals in the Springar Formation. The Intra Tang Formation channel sandstone had a gross thickness of 15 m with 3.4 m net reservoir.
    No hydrocarbon indications were observed in the well except in one cuttings sample at 3006 m where a weak spotty direct fluorescence was observed. This show was described as spotty yellow white direct fluorescence, no visible cut, trace dull yellow white fluorescence ring residue, no visible residue.
    No cores were cut and no wire line fluid samples were taken.
    The well was permanently abandoned on 13 March 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]
    486.00
    3073.00

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    314
    314
    1402
    1654
    1654
    2420
    2420
    2554
    2989
    3016
    3016

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    txt
    0.00
    txt
    0.02
    pdf
    0.28

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    MWD - PP ARCVIS
    496
    1255
    MWD - TELE ARCVIS
    435
    477
    MWD - TELE ARCVIS SONVIS
    386
    496
    MWD - TELE ARCVIS SONVIS ADNVIS
    1255
    2751
    MWD - TELE PP
    314
    386
    MWD - TELE SONVIS GVR ECO
    2751
    3075
    PEX HRLA
    2880
    3060
    PEX HRLA MSIP
    1720
    3075
    VSP
    1200
    3060

  • 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
    380.0
    36
    381.0
    0.00
    LOT
    SURF.COND.
    20
    476.0
    26
    477.0
    1.18
    LOT
    LINER
    16
    668.0
    17 1/2
    671.0
    1.30
    LOT
    INTERM.
    13 3/8
    1249.0
    17 1/2
    1255.0
    1.60
    LOT
    INTERM.
    9 5/8
    2749.0
    12 1/4
    2751.0
    1.89
    LOT
    OPEN HOLE
    3075.0
    8 1/2
    3075.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    314
    1.04
    6.0
    Spud Mud
    425
    1.27
    14.0
    Glydrill
    476
    1.04
    6.0
    Spud Mud
    572
    1.19
    15.0
    Glydrill
    667
    1.09
    18.0
    CMC mud
    670
    1.09
    19.0
    CMC mud
    1215
    1.24
    18.0
    Glydrill
    1667
    1.39
    22.0
    Glydrill
    2751
    1.44
    22.0
    Glydrill
    2873
    1.39
    22.0
    Glydrill
    3075
    1.39
    23.0
    Glydrill