Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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19.06.2024 - 01:33
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7/12-6

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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.
    7/12-6
    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).
    APPRAISAL
    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
    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.
    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.
    7/12-6
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    CN7 - 111 SP: 584.
    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.
    282-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.
    106
    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,
    10.04.1981
    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.
    24.07.1981
    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.
    24.07.1983
    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.
    01.01.2012
    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.
    APPRAISAL
    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.
    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.
    NO
    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
    2nd level with HC, age
    Age of lithostratigraphic unit, 2nd level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE.
    TRIASSIC
    2nd level with HC, formation
    Name of lithostartigraphic unit, 2nd 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.
    SKAGERRAK FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    25.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    69.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3700.0
    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).
    3699.0
    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.
    153
    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° 7' 16.85'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 50' 4.14'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6331048.10
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    489977.47
    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.
    281
  • Wellbore history

    General
    Well 7/12-6 was drilled as an appraisal well on the Ula Field in the southern North Sea. The objective was to determine sand distribution in northern part of the Ula field, and production and injection properties of reservoir and aquifer.
    Operations and results
    Appraisal well 7/12-6 was spudded with the semi-submersible installation Sedco 707 on 10 April 1981 and drilled to TD at 3700 m in the Triassic Skagerrak Formation. Some hole problems and excessive cavings due to underbalanced drilling occurred in the 12 1/4" section between 2633 and 3353 m, otherwise the well was drilled without significant technical problems or delay. The well was drilled with gel/seawater and fluid loss additives down to 480 m and with gypsum/lignosulphonate and fluid loss additives from 480 m to TD.
    The Ula Formation sandstones were penetrated at 3406 m. The sandstones were 115 m thick, very fine to fine grained with porosities from 10 to 25% and permabilities from 1 to 2000 mD. The reservoir was oil bearing throughout, no OWC was established. An unexpected Triassic reservoir of good quality was found below the Ula Formation. The well drilled 179 m into it without reaching the OWC. The reservoir consisted of various types of micaceous sandstones with porosities from 4 to 23% and permabilities from 0.03 to 2600 mD. The first hydrocarbon indication was recorded as a weak oil show at 2440 in siltstone. Further shows were recorded in the Late Cretaceous between 3010 m and 3060 m, however the logs did not indicate any significant mobile hydrocarbon. Hydrocarbon shows were recorded throughout the Upper Jurassic Ula Formation between 3407 m and 3521 m. Patchy shows were recorded in the Triassic interval between 3521 m and TD.
    A total of 240 m core was cut in 9 cores over the interval 3407.7 to 3647.17 m in the Ula and Skagerrak formations. RFT fluid samples were taken at 3437 m (oil), 3533.5 m (mud filtrate), and at 3530.5 m (mud filtrate).
    The well was permanently abandoned on 24 July 1981 as an oil appraisal well.
    Testing
    Both reservoirs were tested.
    DST 1C in the Triassic Skagerrak Formation reservoir (3543 - 3612 m) flowed 160 Sm3 oil and 5720 Sm3 gas through a 12/64" choke. The GOR was 36 Sm3/Sm3. The oil density was 0.810 g/cm3 and the separator gas gravity was 0.806 (air = 1). The bottom hole temperature measured at 3531 m, was 149.4 deg C.
    DST 2 in the Ula Formation sandstone reservoir (3434 - 3511 m) flowed 1269 Sm3 oil and 84526 Sm3 gas through a 32/64" choke. The GOR was 67 Sm3/Sm3. The oil density was 0.842 g/cm3 and the separator gas gravity was 0.840 (air = 1). The bottom hole temperature measured at 3425 m, was 143.3 deg C.
    DST 2 was followed by an injection test. The maximum injection rate was 1407 Sm3/day at a wellhead injection pressure of 3100 to 3200 psi. As no OWC was seen the no injection test could be performed in the aquifer.
  • Cuttings at the Norwegian Offshore Directorate

    Cuttings at the Norwegian Offshore Directorate
    Cuttings available for sampling?
    NO
    Cuttings at the Norwegian Offshore Directorate
    Cutting sample, top depth [m]
    Cutting samples, bottom depth [m]
    180.00
    3632.00
  • 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
    3406.7
    3434.3
    [m ]
    2
    3434.3
    3461.3
    [m ]
    3
    3461.6
    3488.6
    [m ]
    4
    3488.6
    3515.5
    [m ]
    5
    3515.5
    3542.8
    [m ]
    6
    3542.8
    3569.8
    [m ]
    7
    3569.8
    3596.8
    [m ]
    8
    3596.8
    3624.3
    [m ]
    9
    3624.3
    3647.2
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    240.1
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 3406-3409m
    Core photo at depth: 3409-3412m
    Core photo at depth: 3412-3414m
    Core photo at depth: 3414-3417m
    Core photo at depth: 3417-3420m
    3406-3409m
    3409-3412m
    3412-3414m
    3414-3417m
    3417-3420m
    Core photo at depth: 3420-3422m
    Core photo at depth: 3422-3425m
    Core photo at depth: 3425-3428m
    Core photo at depth: 3428-3431m
    Core photo at depth: 3431-3433m
    3420-3422m
    3422-3425m
    3425-3428m
    3428-3431m
    3431-3433m
    Core photo at depth: 3433-3434m
    Core photo at depth: 3434-3437m
    Core photo at depth: 3437-3439m
    Core photo at depth: 3439-3442m
    Core photo at depth: 3442-3445m
    3433-3434m
    3434-3437m
    3437-3439m
    3439-3442m
    3442-3445m
    Core photo at depth: 3445-3447m
    Core photo at depth: 3447-3450m
    Core photo at depth: 3450-3453m
    Core photo at depth: 3453-3455m
    Core photo at depth: 3455-3458m
    3445-3447m
    3447-3450m
    3450-3453m
    3453-3455m
    3455-3458m
    Core photo at depth: 3458-3461m
    Core photo at depth: 3461-3464m
    Core photo at depth: 3464-3467m
    Core photo at depth: 3467-3469m
    Core photo at depth: 3469-3472m
    3458-3461m
    3461-3464m
    3464-3467m
    3467-3469m
    3469-3472m
    Core photo at depth: 3472-3475m
    Core photo at depth: 3475-3477m
    Core photo at depth: 3477-3480m
    Core photo at depth: 3480-3483m
    Core photo at depth: 3483-3485m
    3472-3475m
    3475-3477m
    3477-3480m
    3480-3483m
    3483-3485m
    Core photo at depth: 3485-3488m
    Core photo at depth: 3488-3491m
    Core photo at depth: 3491-3494m
    Core photo at depth: 3494-3496m
    Core photo at depth: 3496-3499m
    3485-3488m
    3488-3491m
    3491-3494m
    3494-3496m
    3496-3499m
    Core photo at depth: 3499-3502m
    Core photo at depth: 3502-3504m
    Core photo at depth: 3504-3507m
    Core photo at depth: 3507-3510m
    Core photo at depth: 3510-3512m
    3499-3502m
    3502-3504m
    3504-3507m
    3507-3510m
    3510-3512m
    Core photo at depth: 3512-3515m
    Core photo at depth: 3515-3518m
    Core photo at depth: 3518-3520m
    Core photo at depth: 3520-3523m
    Core photo at depth: 3523-3526m
    3512-3515m
    3515-3518m
    3518-3520m
    3520-3523m
    3523-3526m
    Core photo at depth: 3526-3528m
    Core photo at depth: 3528-3531m
    Core photo at depth: 3531-3534m
    Core photo at depth: 3534-3537m
    Core photo at depth: 3537-3539m
    3526-3528m
    3528-3531m
    3531-3534m
    3534-3537m
    3537-3539m
    Core photo at depth: 3539-3542m
    Core photo at depth: 3542-3543m
    Core photo at depth: 3543-3545m
    Core photo at depth: 3545-3548m
    Core photo at depth: 3548-3550m
    3539-3542m
    3542-3543m
    3543-3545m
    3545-3548m
    3548-3550m
    Core photo at depth: 3550-3553m
    Core photo at depth: 3553-3556m
    Core photo at depth: 3556-3558m
    Core photo at depth: 3558-3561m
    Core photo at depth: 3561-3564m
    3550-3553m
    3553-3556m
    3556-3558m
    3558-3561m
    3561-3564m
    Core photo at depth: 3564-3567m
    Core photo at depth: 3567-3569m
    Core photo at depth: 3569-3572m
    Core photo at depth: 3572-3575m
    Core photo at depth: 3575-3577m
    3564-3567m
    3567-3569m
    3569-3572m
    3572-3575m
    3575-3577m
    Core photo at depth: 3577-3580m
    Core photo at depth: 3580-3583m
    Core photo at depth: 3583-3585m
    Core photo at depth: 3585-3588m
    Core photo at depth: 3588-3591m
    3577-3580m
    3580-3583m
    3583-3585m
    3585-3588m
    3588-3591m
    Core photo at depth: 3591-3594m
    Core photo at depth: 3594-3596m
    Core photo at depth: 3596-3599m
    Core photo at depth: 3599-3602m
    Core photo at depth: 3602-3604m
    3591-3594m
    3594-3596m
    3596-3599m
    3599-3602m
    3602-3604m
    Core photo at depth: 3604-3607m
    Core photo at depth: 3607-3610m
    Core photo at depth: 3610-3612m
    Core photo at depth: 3612-3615m
    Core photo at depth: 3615-3618m
    3604-3607m
    3607-3610m
    3610-3612m
    3612-3615m
    3615-3618m
    Core photo at depth: 3618-3621m
    Core photo at depth: 3621-3623m
    Core photo at depth: 3623-3624m
    Core photo at depth: 3624-3626m
    Core photo at depth: 3626-3629m
    3618-3621m
    3621-3623m
    3623-3624m
    3624-3626m
    3626-3629m
    Core photo at depth: 3629-3632m
    Core photo at depth: 3632-3635m
    Core photo at depth: 3635-3637m
    Core photo at depth: 3637-3640m
    Core photo at depth: 3640-3643m
    3629-3632m
    3632-3635m
    3635-3637m
    3637-3640m
    3640-3643m
    Core photo at depth: 3643-3645m
    Core photo at depth: 3645-3646m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3643-3645m
    3645-3646m
  • 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
    DST
    TEST2
    0.00
    3511.00
    16.07.1981 - 00:00
    YES
    DST
    0.00
    0.00
    29.06.1983 - 00:00
    YES
  • Lithostratigraphy

  • Geochemical information

    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.21
    pdf
    5.39
    pdf
    0.35
  • 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
    18.37
    pdf
    2.34
    pdf
    29.48
    pdf
    27.74
    pdf
    0.30
    pdf
    37.34
    pdf
    5.33
    pdf
    3.87
    pdf
    3.95
    pdf
    3.98
    pdf
    2.60
    pdf
    29.48
    pdf
    4.31
    pdf
    1.66
    pdf
    1.81
    pdf
    0.68
    pdf
    45.04
    pdf
    13.49
    pdf
    3.88
    pdf
    0.99
    pdf
    11.31
    pdf
    2.96
    pdf
    2.67
    pdf
    207.05
    pdf
    9.83
    pdf
    10.26
    pdf
    11.87
  • Drill stem tests (DST)

    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    3544
    3612
    4.7
    2.0
    3434
    3511
    12.7
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    149
    2.0
    143
    Drill stem tests (DST)
    Test number
    Oil
    [Sm3/day]
    Gas
    [Sm3/day]
    Oil density
    [g/cm3]
    Gas grav. rel.air
    GOR
    [m3/m3]
    1.0
    160
    5720
    0.816
    0.806
    36
    2.0
    1270
    84526
    0.842
    0.840
    66
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL
    3125
    3632
    CCL
    160
    195
    CCL
    3100
    3508
    CCL
    3300
    3525
    CCL
    3300
    3390
    DLL MSFL
    3337
    3703
    FDC CNL CAL GR
    3337
    3704
    HDT SL
    3337
    3703
    ISF BHCS GR MSFL CAL
    465
    1692
    ISF BHCS GR MSFL CAL
    1684
    3351
    ISF BHCS GR SP
    93
    477
    ISF BHCS SP GR
    3337
    3702
    RFT GR
    3415
    3670
    RFT GR
    3416
    3570
    VELOCITY
    200
    3650
  • 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
    172.0
    0.00
    LOT
    SURF.COND.
    18 5/8
    465.0
    17 1/2
    480.0
    1.88
    LOT
    INTERM.
    13 3/8
    1684.0
    17 1/2
    1696.0
    1.83
    LOT
    INTERM.
    9 5/8
    3337.0
    12 1/4
    3350.0
    1.97
    LOT
    LINER
    7
    3688.0
    8 1/2
    3700.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    390
    1.14
    85.0
    waterbased
    1680
    1.30
    58.0
    waterbased
    1990
    1.42
    48.0
    waterbased
    2630
    1.50
    59.0
    waterbased
    3390
    1.50
    51.0
    waterbased
  • Pressure plots

    Pressure plots
    The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.
    Pressure plots
    Document name
    Document format
    Document size [MB]
    pdf
    0.22