Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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31.10.2024 - 01:27
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15/12-7 S

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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.
    15/12-7 S
    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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    15/12-7
    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.
    Den norske stats oljeselskap a.s
    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.
    655-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.
    63
    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,
    06.11.1990
    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.
    07.01.1991
    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.
    07.01.1993
    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.
    11.02.2005
    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.
    DRY
    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.
    85.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3570.0
    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).
    3529.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    26.6
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    128
    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.
    SMITH BANK FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    58° 0' 49.93'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    1° 58' 35.54'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6430858.60
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    439525.83
    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.
    1680

  • Wellbore history
    General
    Well 15/12-7 S was designed to drill in Late Jurassic Oxfordian sandstones on the Theta North prospect in the southeastern part of the PL 116 licence area. The structure is a rotated fault block dipping southeast and bound to the west and north by faults. Based on mapping and inversion studies of the 15/12-5 well and the Beta-east structure it was likely that an Oxfordian sequence was present at the Theta structure. However, it could not be excluded that the Oxfordian reservoir had been eroded from top of the structure. The main objective of well 15/12-7 S was to test the potential for hydrocarbons in the Oxfordian sandstones. A secondary objective was to test possible Triassic sandstones. Seismic anomalies at 441 m and 792 m strongly suggested shallow gas. Because of this the spud location was set outside of the planned location.
    Operations and results
    Wildcat well 15/12-7 S was spudded with the semi-submersible installation Deepsea Bergen on 6 November 1990 and drilled to TD at 3529 m in the Triassic Smith Bank Formation. Problems were encountered in building and dropping angle in deviated well section (13 3/8" to 9 5/8"). Pipe stuck at 2703 m and 2720m but came free. Stuck again with FMT-tool at 3425m. The tool was left in the hole. The well was drilled with seawater and bentonite pills down to 173 m, with seawater and CMC EHV from 173 m to 620 m, with gypsum/PAC from 620 m to 3027 m, and with gel/polymer/lignosulphonate from 3027 m to TD. No shallow gas was encountered at 441 m, but from MWD gas was encountered at 775 m. Several misruns while logging were experienced.
    The Oxfordian reservoir sandstone (Intra Heather Sandstone) came in at 3025 m, 25.5 m shallower than prognosed. No hydrocarbons were encountered. One 27 m conventional core was cut from 3028 m to 3055 m in the reservoir unit with 94.4 % recovery. A total of 100 sidewall cores were attempted of which 93 were recovered. No sidewall cores were attempted in the 17 1/2" section (620 m to 1820 m) due to hole problems. No fluid samples were taken in the well.
    The well was permanently abandoned on 7 January 1991 as a dry well.
    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]
    630.00
    3570.00

  • 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
    3028.0
    3053.5
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    25.5
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3028-3033m
    Core photo at depth: 3033-3038m
    Core photo at depth: 3038-3043m
    Core photo at depth: 3043-3048m
    Core photo at depth: 3048-3053m
    3028-3033m
    3033-3038m
    3038-3043m
    3043-3048m
    3048-3053m
    Core photo at depth: 3053-3054m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3053-3054m

  • 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
    168.0
    36
    170.0
    0.00
    LOT
    INTERM.
    20
    604.0
    26
    606.0
    2.08
    LOT
    INTERM.
    13 3/8
    1797.0
    17 1/2
    1800.0
    1.85
    LOT
    INTERM.
    9 5/8
    3014.0
    12 1/4
    3016.0
    1.65
    LOT
    OPEN HOLE
    3570.0
    8 1/2
    3570.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    ACBL VDL GR
    108
    1795
    ACBL VDL GR
    1460
    3010
    CDL CNL GR CAL
    1797
    3026
    CDL GR CAL
    168
    1786
    CST GR
    1827
    3020
    CST GR
    3025
    3502
    DIFL AC GR SP
    3014
    3570
    DIFL ACL GR SP
    168
    3021
    FMT GR
    3027
    3203
    FMT GR
    3145
    3425
    HR DIPLOG
    3010
    3570
    HR DIPLOG GR
    2350
    3025
    MWD
    179
    3570
    VELOCITY
    500
    2350
    ZDEN CNL SPL CAL
    3010
    3569

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.60

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.50

  • 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
    16.31

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    1099
    1.20
    15.0
    WATER BASED
    1559
    1.20
    15.0
    WATER BASED
    1693
    1.30
    15.0
    WATER BASED
    1815
    1.30
    20.0
    WATER BASED
    1820
    1.35
    13.0
    WATER BASED
    1959
    1.45
    18.0
    WATER BASED
    2142
    1.55
    19.0
    WATER BASED
    2350
    1.60
    27.0
    WATER BASED
    2451
    1.60
    25.0
    WATER BASED
    2498
    1.60
    24.0
    WATER BASED
    2563
    1.60
    25.0
    WATER BASED
    2625
    1.60
    21.0
    WATER BASED
    2638
    1.60
    25.0
    WATER BASED
    2758
    1.60
    26.0
    WATER BASED
    2767
    1.60
    26.0
    WATER BASED
    2799
    1.60
    38.0
    WATER BASED
    2835
    1.60
    28.0
    WATER BASED
    2861
    1.60
    27.0
    WATER BASED
    2917
    1.60
    27.0
    WATER BASED
    2980
    1.60
    29.0
    WATER BASED
    3020
    1.31
    44.0
    WATER BASED
    3026
    1.60
    25.0
    WATER BASED
    3066
    1.30
    20.0
    WATER BASED
    3570
    1.31
    44.0
    WATER BASED

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1827.0
    [m]
    SWC
    STATO
    1858.0
    [m]
    SWC
    STATO
    1915.0
    [m]
    SWC
    STATO
    1945.0
    [m]
    SWC
    STATO
    1975.0
    [m]
    SWC
    STATO
    1995.0
    [m]
    SWC
    STATO
    2020.0
    [m]
    SWC
    STATO
    2080.0
    [m]
    SWC
    STATO
    2251.0
    [m]
    SWC
    STATO
    2288.0
    [m]
    SWC
    STATO
    2353.0
    [m]
    SWC
    STATO
    2364.0
    [m]
    SWC
    STATO
    2375.0
    [m]
    SWC
    STATO
    2383.0
    [m]
    SWC
    STATO
    2390.0
    [m]
    SWC
    STATO
    2408.0
    [m]
    SWC
    STATO
    2422.0
    [m]
    SWC
    STATO
    2437.0
    [m]
    SWC
    STATO
    2494.0
    [m]
    SWC
    STATO
    2510.0
    [m]
    SWC
    STATO
    2527.0
    [m]
    SWC
    STATO
    2542.0
    [m]
    SWC
    STATO
    2555.0
    [m]
    SWC
    STATO
    2571.0
    [m]
    SWC
    STATO
    2585.0
    [m]
    SWC
    STATO
    2960.0
    [m]
    SWC
    STATO
    2975.0
    [m]
    SWC
    STATO
    2983.0
    [m]
    SWC
    STATO
    2990.0
    [m]
    SWC
    STATO
    2998.0
    [m]
    SWC
    STATO
    3005.0
    [m]
    SWC
    STATO
    3020.0
    [m]
    SWC
    STATO
    3028.0
    [m]
    C
    STATO
    3028.3
    [m]
    C
    STATO
    3028.7
    [m]
    C
    STATO
    3029.3
    [m]
    C
    STATO
    3032.5
    [m]
    C
    STATO
    3033.0
    [m]
    C
    STATO
    3035.6
    [m]
    C
    STATO
    3037.6
    [m]
    C
    STATO
    3039.9
    [m]
    C
    STATO
    3040.0
    [m]
    C
    STATO
    3049.0
    [m]
    C
    STATO
    3049.5
    [m]
    C
    STATO
    3066.0
    [m]
    DC
    STATO
    3174.0
    [m]
    DC
    STATO
    3234.0
    [m]
    DC
    STATO
    3258.0
    [m]
    DC
    STATO
    3267.0
    [m]
    DC
    STATO
    3270.0
    [m]
    DC
    STATO
    3483.0
    [m]
    DC
    STATO
    3570.0
    [m]
    DC
    STATO