Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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21.11.2024 - 01:28
Time of last synchronization with Norwegian Offshore Directorate's internal systems

7/12-5

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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.
    7/12-5
    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
    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
    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.
    7/12-5
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    SL CN7 - 118 SP: 220.
    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.
    276-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.
    122
    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,
    06.02.1981
    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.
    07.06.1981
    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.
    07.06.1983
    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.
    28.03.2014
    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
    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.
    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
    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.
    73.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4440.0
    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).
    4437.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    4.75
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    152
    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 PERMIAN
    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.
    ZECHSTEIN GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    57° 9' 49.01'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 46' 42.35'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6335762.94
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    486598.60
    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.
    299

  • Wellbore history
    General
    Well 7/12-5 was drilled ca 4 km northwest of the Ula Field in the North Sea. The objective was to test the hydrocarbon potential in Late Jurassic Sandstones. Secondary objectives were Early Jurassic and Triassic sandstones.
    Operations and results
    Wildcat well 7/12-5 was spudded with the semi-submersible installation Borgsten Dolphin 6 February 1981 and drilled to TD at 4440 m in the Late Permian Zechstein Group. There were some problems with drilling the section from 2851 to 3741 m due to junk in hole, otherwise operations proceeded without significant problems. The well was drilled with sea water and hi-vis pills and gel down to 467 m and with gypsum/lignosulphonate/CMC mud from 467 m to TD.
    The Mandal Formation was penetrated at 3731 m, while the Farsund Formation was penetrated at 3763 m. The Ula Formation was penetrated at 3831 m and consisted of a 69.5 m thick homogenous sandstone, very fine to fine grained with poor reservoir characteristics (porosities from 7 to 14 % and permeabilities from 0.3 to 3 mD). All attempts to obtain reservoir pressures and fluid samples failed due to tight formation. Oil shows were recorded in the upper half of the reservoir and an oil water contact was established at 3872. Log analysis indicated that no significant hydrocarbons were present below the Ula formation where all porous zones calculated high water saturations. Weak shows were recorded in sandstone in the interval 3940 to 3960 m in the Skagerrak Formation. Weak shows were recorded also in siltstone in an isolated sample from 2235 m in the Hordaland Group.
    Four cores were cut from 3844.5 to 3912.15 m in the Ula, Fjerritslev, and Skagerrak formations. Core depths are 4.8 m deeper than logger's depth. No wire line fluid samples were taken.
    The well was permanently abandoned on 7 June 1981 as an oil discovery.
    Testing
    No drill stem test was performed.

  • 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
    4436.00

  • 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
    3844.5
    3862.7
    [m ]
    2
    3862.7
    3876.4
    [m ]
    3
    3876.3
    3894.3
    [m ]
    4
    3894.3
    3912.2
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    67.8
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3844-3847m
    Core photo at depth: 3847-3849m
    Core photo at depth: 3849-3852m
    Core photo at depth: 3852-3855m
    Core photo at depth: 3855-3858m
    3844-3847m
    3847-3849m
    3849-3852m
    3852-3855m
    3855-3858m
    Core photo at depth: 3858-3860m
    Core photo at depth: 3880-3882m
    Core photo at depth: 3862-3865m
    Core photo at depth: 3865-3868m
    Core photo at depth: 3868-3870m
    3858-3860m
    3880-3882m
    3862-3865m
    3865-3868m
    3868-3870m
    Core photo at depth: 3870-3873m
    Core photo at depth: 3873-3876m
    Core photo at depth: 3876-3876m
    Core photo at depth: 3876-3879m
    Core photo at depth: 3879-3881m
    3870-3873m
    3873-3876m
    3876-3876m
    3876-3879m
    3879-3881m
    Core photo at depth: 3881-3884m
    Core photo at depth: 3884-3887m
    Core photo at depth: 3887-3889m
    Core photo at depth: 3889-3892m
    Core photo at depth: 3892-3894m
    3881-3884m
    3884-3887m
    3887-3889m
    3889-3892m
    3892-3894m
    Core photo at depth: 3894-3897m
    Core photo at depth: 3897-3899m
    Core photo at depth: 3899-3902m
    Core photo at depth: 3902-3905m
    Core photo at depth: 3905-3907m
    3894-3897m
    3897-3899m
    3899-3902m
    3902-3905m
    3905-3907m
    Core photo at depth: 3907-3910m
    Core photo at depth: 3910-3912m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3907-3910m
    3910-3912m

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.92
    pdf
    3.85
    pdf
    0.32
    pdf
    10.11

  • 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
    14.39

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    4185
    4197
    14.3
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    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
    470
    118000
    0.828
    0.876
    251

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL CCL
    98
    1818
    CST
    3732
    4113
    DLL MSFL GR SP CAL
    3733
    4043
    FDC CNL GR SP CAL
    3695
    4432
    HDT
    3718
    4116
    HRT
    98
    1804
    ISF BHC GR SP
    98
    463
    ISF BHC GR SP
    3737
    4430
    ISF BHC GR SP MSFL
    454
    3738
    ISF BHC GR SP MSFL
    4056
    4113

  • 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
    182.0
    36
    188.0
    0.00
    LOT
    SURF.COND.
    20
    456.0
    26
    467.0
    1.99
    LOT
    INTERM.
    13 3/8
    1658.0
    17 1/2
    1670.5
    1.83
    LOT
    INTERM.
    9 5/8
    3732.0
    12 1/4
    3740.0
    2.06
    LOT
    OPEN HOLE
    4440.0
    8 1/2
    4440.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    188
    1.05
    WATER BASED
    03.06.1981
    325
    1.08
    WATER BASED
    03.06.1981
    467
    1.29
    WATER BASED
    03.06.1981
    509
    1.15
    WATER BASED
    03.06.1981
    849
    1.16
    WATER BASED
    03.06.1981
    1029
    1.17
    WATER BASED
    03.06.1981
    1246
    1.22
    WATER BASED
    03.06.1981
    1670
    1.40
    WATER BASED
    03.06.1981
    1924
    1.42
    WATER BASED
    03.06.1981
    2085
    1.42
    WATER BASED
    03.06.1981
    2166
    1.42
    WATER BASED
    03.06.1981
    2224
    1.42
    WATER BASED
    03.06.1981
    2414
    1.43
    WATER BASED
    03.06.1981
    2835
    1.48
    WATER BASED
    03.06.1981
    3006
    1.48
    WATER BASED
    03.06.1981
    3113
    1.48
    WATER BASED
    03.06.1981
    3417
    1.48
    WATER BASED
    03.06.1981
    3741
    1.50
    WATER BASED
    03.06.1981
    4193
    1.50
    WATER BASED
    03.06.1981
    4249
    1.50
    WATER BASED
    03.06.1981
    4332
    1.49
    WATER BASED
    03.06.1981
    4440
    1.50
    WATER BASED
    03.06.1981