Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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11.11.2024 - 01:26
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7/12-4

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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.
    7/12-4
    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.
    SUSPENDED
    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.
    7/12-4
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    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.
    183-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.
    93
    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,
    11.09.1977
    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.
    12.12.1977
    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.
    12.12.1979
    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.
    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
    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).
    3623.0
    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).
    3623.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    1.9
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    144
    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.
    BRYNE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    57° 5' 36.66'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 51' 36.96'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6327946.46
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    491532.39
    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.
    298

  • Wellbore history
    General
    Well 7/12-4 was drilled as an appraisal well on the Ula Field in the North Sea. The main objective was to evaluate the extent and hydrocarbon potential of the Late Jurassic sands in the south eastern flank of the structure.
    Operations and results
    Appraisal well 7/12-4 was spudded with the semi-submersible installation Nordskald on 11 September 1977 and drilled to TD at 3623 m in Early Jurassic sediments of the Bryne Formation. Operations proceeded without significant problem. The well was drilled with fresh water/gel down to 498 m and with lime/Drispac mud from 498 m to TD.
    The target reservoir Ula Formation was encountered at 3445 m, while the underlying Bryne Formation came in at 3529 m. Net sand in the reservoir was 73 m with porosity from 10 to 23%, permeability from a few millidarcy to 1750 millidarcy, and water saturation from 5 to over 60%. The reservoir was oil-bearing with a possible OWC at 3551 m in the Bryne Formation based on disappearance of oil shows; however, drill stem tests showed that the producible contact between oil and water was between 3530 and 3536 m.
    Seven cores were cut from near top Ula Formation at 3447.5 m to 3556.7 m in the Bryne Formation. The recovery was 100% in core one to six and 96% in core seven. RFT fluid samples were taken at 3458 m (oil, emulsion and water), 3467 m (emulsion) and at 3528 m (water)
    The well was suspended on 12 December 1977 for possible use as a producer at a later stage. It is classified as an oil appraisal well.
    Testing
    Production tests were carried out on three reservoir intervals to establish the producible oil-water contact and to obtain reservoir properties of the Middle and Late Jurassic sands.
    DST 1 tested the intervals 3536 to 3540 m and 3550 to 3552 m. This test failed for mechanical reasons in the first attempt. The second attempt, DST 1B, produced 10 Sm3 water/day with no indication of hydrocarbons. This was the only test where the temperature gauge functioned correctly. The measured temperature was 141.1 deg C
    DST 2 tested the interval 3527 to 3530 m. This test produced 6 Sm3 oil/day from low-permeable sands at the base of the reservoir. The oil density was 0.828 g/cm3.
    DST 3 tested the main reservoir from the intervals 3453 to 3460 m and 3463.5 to 3471.5 m. This test produced in the final flow 1110 Sm3 oil, 73624 Sm3 gas /day through a 32/64" choke. The separator GOR was 66 Sm3/Sm3 while the total GOR was 96 Sm3/Sm3. The oil density was 0.830 g/cm3 and the gas gravity was 0.754 (air = 1).

  • 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]
    180.00
    3621.00

  • 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
    3447.5
    3465.8
    [m ]
    2
    3465.8
    3474.5
    [m ]
    3
    3474.5
    3491.5
    [m ]
    4
    3492.5
    3510.7
    [m ]
    5
    3510.7
    3519.7
    [m ]
    6
    3519.7
    3538.4
    [m ]
    7
    3538.4
    3556.7
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    108.2
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3447-3452m
    Core photo at depth: 3452-3457m
    Core photo at depth: 3457-3462m
    Core photo at depth: 3462-3465m
    Core photo at depth: 3465-3470m
    3447-3452m
    3452-3457m
    3457-3462m
    3462-3465m
    3465-3470m
    Core photo at depth: 3470-3474m
    Core photo at depth: 3474-3479m
    Core photo at depth: 3479-3484m
    Core photo at depth: 3484-3489m
    Core photo at depth: 3489-3491m
    3470-3474m
    3474-3479m
    3479-3484m
    3484-3489m
    3489-3491m
    Core photo at depth: 3492-3495m
    Core photo at depth: 3495-3497m
    Core photo at depth: 3500-3503m
    Core photo at depth: 3503-3506m
    Core photo at depth: 3497-3501m
    3492-3495m
    3495-3497m
    3500-3503m
    3503-3506m
    3497-3501m
    Core photo at depth: 3506-3510m
    Core photo at depth: 3510-3515m
    Core photo at depth: 3515-3519m
    Core photo at depth: 3522-3525m
    Core photo at depth: 3525-3527m
    3506-3510m
    3510-3515m
    3515-3519m
    3522-3525m
    3525-3527m
    Core photo at depth: 3527-3530m
    Core photo at depth: 3519-3531m
    Core photo at depth: 3531-3536m
    Core photo at depth: 3536-3538m
    Core photo at depth: 3538-3543m
    3527-3530m
    3519-3531m
    3531-3536m
    3536-3538m
    3538-3543m
    Core photo at depth: 3543-3548m
    Core photo at depth: 3548-3553m
    Core photo at depth: 3553-3556m
    Core photo at depth:  
    Core photo at depth:  
    3543-3548m
    3548-3553m
    3553-3556m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    3448.2
    [m]
    C
    HYDRO
    3449.8
    [m]
    C
    HYDRO
    3450.0
    [m]
    C
    HYDRO
    3456.5
    [m]
    C
    HYDRO
    3460.0
    [m]
    C
    HYDRO
    3465.0
    [m]
    C
    HYDRO
    3470.7
    [m]
    C
    HYDRO
    3471.6
    [m]
    C
    HYDRO
    3472.3
    [m]
    C
    HYDRO
    3473.8
    [m]
    C
    HYDRO
    3474.8
    [m]
    C
    HYDRO
    3479.7
    [m]
    C
    HYDRO
    3484.5
    [m]
    C
    HYDRO
    3485.3
    [m]
    C
    HYDRO
    3486.0
    [m]
    C
    HYDRO
    3487.8
    [m]
    C
    HYDRO
    3490.6
    [m]
    C
    HYDRO
    3495.4
    [m]
    C
    HYDRO
    3500.5
    [m]
    C
    HYDRO
    3505.2
    [m]
    C
    HYDRO
    3509.7
    [m]
    C
    HYDRO
    3514.5
    [m]
    C
    HYDRO
    3519.0
    [m]
    C
    HYDRO
    3523.0
    [m]
    C
    HYDRO
    3525.1
    [m]
    C
    HYDRO
    3525.5
    [m]
    C
    HYDRO
    3527.0
    [m]
    C
    HYDRO
    3528.0
    [m]
    C
    HYDRO
    3530.2
    [m]
    C
    HYDRO
    3534.1
    [m]
    C
    HYDRO
    3537.0
    [m]
    C
    HYDRO

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.56
    pdf
    0.48
    pdf
    0.54
    pdf
    1.43
    pdf
    0.64
    pdf
    0.63
    pdf
    0.27

  • 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
    2.23
    pdf
    8.41
    pdf
    7.88

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    3536
    3552
    0.0
    2.0
    3527
    3530
    0.0
    3.0
    3453
    3472
    12.4
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    141
    2.0
    3.0
    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
    2.0
    6
    0.830
    3.0
    1110
    73624
    0.830
    1.000
    96

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL
    85
    3589
    CDM AP
    3367
    3621
    DLL MSFL
    3366
    3619
    FDC CNL
    3366
    3620
    GR
    95
    480
    ISF SONIC
    480
    3618
    SRS
    80
    3618

  • 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
    169.0
    36
    174.0
    0.00
    LOT
    SURF.COND.
    20
    492.0
    26
    498.0
    0.00
    LOT
    INTERM.
    13 3/8
    1678.0
    17 1/2
    1694.0
    0.00
    LOT
    INTERM.
    9 5/8
    3369.0
    12 1/4
    3373.0
    0.00
    LOT
    LINER
    7
    3620.0
    8 1/2
    3621.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    0
    1.43
    waterbased
    498
    1.06
    waterbased
    597
    1.43
    waterbased
    1125
    1.40
    waterbased
    1388
    1.44
    waterbased
    1694
    1.45
    waterbased
    2920
    1.44
    waterbased
    3339
    1.44
    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