Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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31.10.2024 - 01:27
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7/12-2

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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.
    7/12-2
    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.
    SUSPENDED
    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.
    7/12-2
    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.
    161-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.
    82
    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,
    04.07.1976
    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.
    23.09.1976
    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.
    23.09.1978
    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.
    13.08.2015
    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
    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.
    EARLY JURASSIC
    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.
    GASSUM 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.
    71.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3676.0
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    154
    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.
    GASSUM FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    57° 6' 41.05'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 50' 51.04'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6329939.23
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    490763.87
    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.
    295
  • Wellbore history

    General
    Well 7/12-2 was drilled on a salt induced structure on the east side of the Cod Terrace in the North Sea. The primary objective was to evaluate potential Upper Jurassic and Triassic reservoirs
    The well is Type well for the Ula Formation and Reference well for the Farsund Formation.
    Operations and results
    Wildcat well 7/12-2 was spudded with the semi-submersible installation Norskald on 4 July 1976 and drilled to TD at 3676 m in the Early Jurassic Gassum Formation. The well was drilled with seawater/gel down to 158.5 m and with seawater/lime Drispac mud from 158.5 m to TD down to 495 m and with a lime/Drispac mud from 495 m to TD.
    Well 7/12-2 penetrated a major Late Jurassic reservoir (Ula Formation) and was terminated within a hydrocarbon bearing sequence of poor quality sands and interbedded shales in the Gassum Formation. Core analysis and log interpretation indicate an Ula Formation sandstone reservoir of 128 m net thickness (154 m gross) with porosities ranging from 14 to 28%, permeabilities from a few millidarcy to over two darcy and water saturations from 5 to over 50%. The Ula Formation was oil bearing from top to base at 3532 m in an oil down-to setting. The Gassum Formation sandstones have a porosity between 11 and 19%, average permeability of 1 md and water saturation generally in excess of 70%.
    Eleven cores were cut in the well. Cores one to ten were cut in succession from 3385.75 m (3380.95 m logger's depth) to 3476.9 m (3470.9 m logger's depth) in the Ula Formation. The overall core recovery for this section was 97.3%. Core no 11 was cut in the Early Jurassic from 3634.2 to 3652.3 m with 100% recovery. The core-log depth shifts varied from -4.8 m to -6.0 m. No fluid samples were taken on wire line.
    The well was suspended on 23 September 1976 for later re-entry and testing of reservoir productivity. It is classified as an oil discovery.
    Testing
    Six drill stem tests were performed: DST 1 and 1a in the Early Jurassic Gassum Formation and the others in the Late Jurassic Ula Formation.
    DST 1 tested the interval 3640.5 to 3665.5 m. the test did not produce oil to the surface, but about 3 - 5 gallons of clean oil was found in the drill collars immediately below the downhole valve. The oil gravity was estimated to 40°API. The DST temperature was 145.6 °C.
    DST la was a retest of the DST 1 interval with a different test string. Again the test did not produce to surface, but about 0.6 m3 (four bbls) of clean oil was reversed out of the test string. The oil gravity was 41.3 °API and the gas gravity was 0.805 (air = 1). The gas and oil had an aromatic smell, guessed to be from toluene.
    DST 2 tested the interval 3525 to 3532 m. The test produced small quantities of gas but no oil to surface. Based on reversed content the rates in the test was estimated to 24 Sm3 oil /day. The oil gravity was 37.7 °API. The DST temperature was 145.6 °C.
    DST 3 tested the interval 3426.5 to 3438.7 m. The test produced 795 Sm3 oil /day through a 1" choke. The GOR was 102 Sm3/Sm3, the oil gravity was 40.2 °API and the gas gravity was 0.748 (air = 1). The test was a mechanical misrun, as the valves were not fully shut during build-ups.
    DST 3a was a retest of the DST 3 interval with a different test string. The test produced up to 1132 Sm3 oil /day through a 0.5" choke. The GOR was 107 Sm3/Sm3, the oil gravity was 40.4 °API and the gas gravity was 0.751 (air = 1). The DST temperature was 146.1 °C and this temperature was regarded as the most representative of all DST temperatures in the well.
    DST 4 tested the interval 3383.7 to 3393 m. The test did not achieve stabilised rates but produced on average ca 95 Sm3 oil /day. The GOR was similar as in DST 3a, the oil gravity was 41.0 °API and the gas gravity was 0.817. The DST temperature was 145.6.
  • 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]
    166.00
    3676.00
  • 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
    3385.8
    3404.0
    [m ]
    2
    3404.0
    3414.0
    [m ]
    3
    3414.0
    3417.2
    [m ]
    4
    3417.2
    3420.5
    [m ]
    5
    3421.7
    3429.0
    [m ]
    6
    3430.0
    3438.5
    [m ]
    7
    3439.1
    3440.2
    [m ]
    8
    3440.3
    3449.8
    [m ]
    9
    3449.8
    3458.9
    [m ]
    10
    3458.9
    3476.9
    [m ]
    11
    3634.2
    3652.3
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    106.3
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 3385-3390m
    Core photo at depth: 3390-3395m
    Core photo at depth: 3395-3397m
    Core photo at depth: 3395-3400m
    Core photo at depth: 3400-3404m
    3385-3390m
    3390-3395m
    3395-3397m
    3395-3400m
    3400-3404m
    Core photo at depth: 3404-3409m
    Core photo at depth: 3409-3414m
    Core photo at depth: 3414-3417m
    Core photo at depth: 3417-3420m
    Core photo at depth: 3421-3426m
    3404-3409m
    3409-3414m
    3414-3417m
    3417-3420m
    3421-3426m
    Core photo at depth: 3426-3430m
    Core photo at depth: 3430-3435m
    Core photo at depth: 3435-3438m
    Core photo at depth: 3439-3440m
    Core photo at depth: 3440-3449m
    3426-3430m
    3430-3435m
    3435-3438m
    3439-3440m
    3440-3449m
    Core photo at depth: 3445-3449m
    Core photo at depth: 3449-3454m
    Core photo at depth: 3454-3458m
    Core photo at depth: 3458-3463m
    Core photo at depth: 3463-3468m
    3445-3449m
    3449-3454m
    3454-3458m
    3458-3463m
    3463-3468m
    Core photo at depth: 3468-3473m
    Core photo at depth: 3473-3475m
    Core photo at depth: 3634-3639m
    Core photo at depth: 3639-3644m
    Core photo at depth: 3644-3649m
    3468-3473m
    3473-3475m
    3634-3639m
    3639-3644m
    3644-3649m
    Core photo at depth: 3649-3652m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3649-3652m
  • 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
    DST1A
    3640.20
    3666.00
    08.09.1976 - 00:00
    YES
    DST
    DST2
    3525.00
    3532.00
    11.09.1976 - 00:00
    YES
    DST
    DST3
    3426.50
    3437.70
    14.09.1976 - 00:00
    YES
    DST
    DST4
    3383.70
    3393.00
    18.09.1976 - 00:00
    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
    159.0
    36
    160.0
    0.00
    LOT
    SURF.COND.
    20
    480.0
    26
    495.0
    0.00
    LOT
    INTERM.
    13 3/8
    1523.0
    17 1/2
    1536.0
    0.00
    LOT
    INTERM.
    9 5/8
    3092.0
    12 1/4
    3115.0
    0.00
    LOT
    LINER
    7
    3675.0
    8 1/2
    3676.0
    0.00
    LOT
  • Drill stem tests (DST)

    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    3640
    3666
    76.0
    1.1
    3640
    3666
    76.0
    2.0
    3525
    3532
    0.0
    3.0
    3427
    3439
    24.5
    3.1
    3427
    3438
    12.3
    4.0
    3384
    3393
    76.0
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    145
    1.1
    2.0
    145
    3.0
    3.1
    146
    4.0
    145
    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
    6
    8490
    0.820
    1.1
    1
    8490
    0.820
    2.0
    23
    3.0
    795
    0.820
    0.748
    102
    3.1
    1129
    11930
    0.820
    0.751
    4.0
    84
    7079
    0.820
    0.817
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    BHC
    3078
    3501
    CBL
    2970
    3666
    CDM
    3092
    3668
    DLL MSFL
    3092
    3668
    FDC
    1518
    3113
    FDC CNL
    3092
    3668
    GR
    94
    484
    ISF SON
    484
    3668
    VELOCITY
    96
    3676
  • Lithostratigraphy

  • Geochemical information

    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.24
    pdf
    0.46
    pdf
    0.10
    pdf
    0.29
    pdf
    0.14
    pdf
    1.05
  • 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
    2.01
    pdf
    10.78
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    1219
    1.31
    waterbased
    3385
    1.60
    waterbased
  • Palynological slides at the Norwegian Offshore Directorate

    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    3259.0
    [m]
    DC
    PETROSTR
    3265.0
    [m]
    DC
    PETROS
    3271.0
    [m]
    DC
    PETROS
    3277.0
    [m]
    DC
    PETROS
    3283.0
    [m]
    DC
    PETROS
    3289.0
    [m]
    DC
    PETROS
    3295.0
    [m]
    DC
    PETROS
    3301.0
    [m]
    DC
    PETROS
    3307.0
    [m]
    DC
    PETROS
    3313.0
    [m]
    DC
    PETROS
    3319.0
    [m]
    DC
    PETROS
    3325.0
    [m]
    DC
    PETROS
    3331.0
    [m]
    DC
    PETROS
    3337.0
    [m]
    DC
    PETROS
    3343.0
    [m]
    DC
    PETROS
    3349.0
    [m]
    DC
    PETROS
    3351.0
    [m]
    DC
    PETROS
    3361.0
    [m]
    DC
    PETROS
    3364.0
    [m]
    DC
    PETROS
    3367.0
    [m]
    DC
    PETROS
    3373.0
    [m]
    DC
    PETROS
    3379.0
    [m]
    DC
    PETROS
    3385.0
    [m]
    DC
    PETROS
    3385.9
    [ft]
    C
    PETROS
    3386.0
    [m]
    C
    PETROS
    3386.0
    [m]
    C
    APT
    3386.7
    [ft]
    C
    PETROS
    3391.0
    [m]
    C
    APT
    3396.6
    [m]
    C
    APT
    3397.1
    [m]
    C
    APT
    3397.7
    [ft]
    C
    PETROS
    3397.8
    [m]
    C
    PETROS
    3398.0
    [m]
    C
    APT
    3399.9
    [m]
    C
    PETROS
    3401.6
    [m]
    C
    APT
    3409.3
    [m]
    C
    PETROS
    3411.2
    [m]
    C
    APT
    3412.3
    [ft]
    C
    PETROS
    3414.0
    [m]
    C
    APT
    3416.5
    [m]
    C
    PETROS
    3416.5
    [m]
    C
    PETROS
    3416.5
    [m]
    C
    APT
    3419.4
    [ft]
    C
    PETROS
    3422.4
    [m]
    C
    APT
    3422.6
    [m]
    C
    PETROS
    3425.2
    [m]
    C
    APT
    3425.5
    [ft]
    C
    PETROS
    3425.5
    [m]
    C
    APT
    3426.1
    [m]
    C
    PETROS
    3432.6
    [ft]
    C
    PETROS
    3432.7
    [m]
    C
    PETROS
    3433.6
    [ft]
    C
    PETROS
    3434.0
    [m]
    C
    APT
    3434.3
    [m]
    C
    APT
    3437.0
    [m]
    C
    APT
    3438.2
    [m]
    C
    APT
    3438.3
    [ft]
    C
    PETROS
    3442.3
    [ft]
    C
    PETROS
    3442.7
    [m]
    C
    PETROS
    3443.0
    [ft]
    C
    PETROS
    3448.4
    [m]
    C
    APT
    3448.9
    [m]
    C
    PETROS
    3449.8
    [ft]
    C
    PETROS
    3449.9
    [m]
    C
    APT
    3452.3
    [ft]
    C
    PETROS
    3456.4
    [m]
    C
    APT
    3457.9
    [ft]
    C
    PETROS
    3458.8
    [m]
    C
    APT
    3461.0
    [m]
    C
    PETROS
    3463.2
    [ft]
    C
    PETROS
    3467.6
    [m]
    C
    PETROS
    3469.5
    [ft]
    C
    PETROS
    3469.6
    [m]
    C
    APT
    3469.7
    [ft]
    C
    PETROS
    3471.3
    [m]
    C
    APT
    3473.0
    [m]
    C
    APT
    3473.3
    [ft]
    C
    PETROS
    3474.0
    [ft]
    C
    PETROS
    3475.0
    [m]
    C
    APT
    3475.6
    [m]
    C
    APT
    3476.0
    [m]
    C
    PETROS
    3481.0
    [m]
    DC
    PETROS
    3487.0
    [m]
    DC
    PETROS
    3490.0
    [m]
    DC
    PETROS
    3493.0
    [m]
    DC
    PETROS
    3505.0
    [m]
    DC
    PETROS
    3511.0
    [m]
    DC
    PETROS
    3517.0
    [m]
    DC
    PETROS
    3520.0
    [m]
    DC
    PETROS
    3523.0
    [m]
    DC
    PETROS
    3529.0
    [m]
    DC
    PETROS
    3535.0
    [m]
    DC
    PETROS
    3547.0
    [m]
    DC
    PETROS