Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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25.11.2024 - 01:30
Time of last synchronization with Norwegian Offshore Directorate's internal systems

7/12-10

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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.
    7/12-10
    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
    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.
    7/12-10
    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.
    BP Norway Limited U.A.
    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.
    686-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.
    53
    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,
    08.07.1991
    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.
    29.08.1991
    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.
    29.08.1993
    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.
    06.01.2014
    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.
    23.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    71.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3667.0
    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).
    3666.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    2.74
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    116
    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.
    TRIASSIC
    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.
    SKAGERRAK FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    57° 10' 57.37'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 48' 18.47'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6337871.90
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    488219.56
    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.
    1557

  • Wellbore history
    General
    Well 7/12-10 was drilled a few km north of the Ula Field, on the north-eastern side of the Cod Terrace in the North Sea. The primary objective was to prove a commercial volume of oil in the Late Jurassic Ula formation for tie back to the Ula platform. Secondary reservoir potential existed in both the middle Jurassic and the uppermost part of the Triassic.
    Operations and results
    Wildcat well 7/12-10 was spudded with the semi-submersible installation Ross Isle on 8 July 1991 and drilled to TD at 3667 m in the Triassic Skagerrak Formation. After the 30" conductor was set at 167 m, a 17 1/2" pilot hole was drilled without riser to 950 m. No indications of shallow gas were observed. The well was drilled with seawater and hi-vis slugs down to 948 m, with Ancoquat water based mud from 948 m to 2730 m, and with KCl/polymer mud from 2730 m to TD. The inhibitive Ancoquat mud system was tested for the first time on the Norwegian Continental Shelf in this well.
    Shows of oil were observed from 3010 m to 3100 m in the Tor limestone. Subsequent intermediate logs however indicated that there was not sufficient quantity of oil to warrant testing the limestone. Top Mandal formation was encountered at 3531 m drilled depth/3538 m logged depth. Top Ula formation was seen at 3620m drilled depth/3627 m logged depth. This was 56 m deeper than prognosed, and the formation was also ca 30 m thinner than expected. The Ula sandstone was found water bearing with no shows and it was not in pressure communication with the main Ula field. Top Triassic was identified at 3641.5 m logged depth. It was water bearing with no shows.
    Two conventional cores were cut from 3616 m to 3628 m and 3628 m to 3655 m with 100% recovery. Core # 1 covered the lower part of the Lower Carbonaceous member of the Farsund Formation and 7.5 m of the Ula Formation. Core # 2 covered the lowermost 7 m of the Ula formation and 20 m of micaceous sandstone of Triassic age. The core depths were ca 7 m shallower than logged depths. No wire line fluid samples were taken.
    The well was permanently abandoned on 29 August 1993 as a dry 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]
    960.00
    3667.00

  • 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
    3616.0
    3627.8
    [m ]
    2
    3628.0
    3655.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    38.8
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3616-3621m
    Core photo at depth: 3621-3626m
    Core photo at depth: 3631-3636m
    Core photo at depth: 3636-3641m
    Core photo at depth: 3641-3646m
    3616-3621m
    3621-3626m
    3631-3636m
    3636-3641m
    3641-3646m
    Core photo at depth: 3646-3651m
    Core photo at depth: 3651-3655m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3646-3651m
    3651-3655m

  • 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
    167.0
    36
    168.0
    0.00
    LOT
    INTERM.
    20
    939.0
    26
    948.0
    1.75
    LOT
    INTERM.
    13 3/8
    2724.0
    17 1/2
    2730.0
    1.75
    LOT
    OPEN HOLE
    3667.0
    12 1/4
    3667.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CHECKSHOT
    1900
    3665
    CST GR
    2918
    3673
    DLL MSFL ASL GR
    3096
    3669
    DLL MSFL ASL GR SP
    2726
    3153
    DLL MSFL LSS GR SP
    70
    2730
    LDL CNL GR
    2829
    3156
    LDL CNL NGS
    3600
    3672
    RFT GR
    3013
    3065

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.29
    pdf
    0.63

  • 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
    1.26
    pdf
    18.79

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    550
    1.03
    water based
    950
    1.03
    water based
    1064
    1.75
    34.0
    water based
    1366
    1.55
    37.0
    water based
    1501
    1.55
    42.0
    water based
    2300
    1.60
    11.0
    water based
    2724
    1.57
    43.0
    water based
    3151
    1.55
    29.0
    water based
    3667
    1.57
    27.0
    water based
    3667
    1.55
    37.0
    water based

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    3532.0
    [m]
    DC
    PETROSTR
    3535.0
    [m]
    DC
    PETROS
    3538.0
    [m]
    DC
    PETROS
    3541.0
    [m]
    DC
    PETROS
    3544.0
    [m]
    DC
    PETROS
    3547.0
    [m]
    DC
    PETROS
    3550.0
    [m]
    DC
    PETROS
    3556.0
    [m]
    DC
    PETROS
    3562.0
    [m]
    DC
    PETROS
    3568.0
    [m]
    DC
    PETROS
    3574.0
    [m]
    DC
    PETROS
    3580.0
    [m]
    DC
    PETROS
    3586.0
    [m]
    DC
    PETROS
    3592.0
    [m]
    DC
    PETROS
    3598.0
    [m]
    DC
    PETROS
    3604.0
    [m]
    DC
    PETROS
    3610.0
    [m]
    DC
    PETROS
    3616.0
    [m]
    DC
    PETROS
    3620.0
    [m]
    C
    PETROS
    3624.2
    [m]
    C
    PETROS
    3628.3
    [m]
    C
    PETROS
    3632.2
    [m]
    C
    PETROS
    3638.5
    [m]
    C
    PETROS
    3641.6
    [m]
    C
    PETROS