Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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sodir.no          Norsk
22.11.2024 - 09:09
Time of last synchronization with Norwegian Offshore Directorate's internal systems

15/12-8

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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.
    15/12-8
    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
    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.
    15/12-8
    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.
    684-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.
    40
    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,
    05.06.1991
    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.
    14.07.1991
    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.
    14.07.1993
    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.
    17.10.2007
    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.
    GAS/CONDENSATE
    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.
    VESTLAND GP
    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.
    23.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    87.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3054.0
    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).
    3052.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    6.4
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    120
    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.
    58° 3' 1.85'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    1° 58' 3.41'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6434946.27
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    439060.86
    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.
    1778

  • Wellbore history
    General
    Wildcat well 15/12-8 was drilled ca 3.5 km east of the 15/12-4 well, which made the Varg oil discovery in Jurassic and Triassic sandstones. The main objective of the well was to test the potential for hydrocarbons in sandstones of Oxfordian and Triassic age. Seismic anomalies at 437, 467, 479 and 803 m indicated possibility for shallow gas. Planned TD for the well was 3260 m.
    Operations and results
    Well 15/12-8 was spudded with the semi-submersible installation Deepsea Bergen on 5 June 1991 and drilled to TD at 3054 m in the Triassic Skagerrak Formation. No significant problems occurred during operations. The well was drilled with seawater / hi-vis pills / CMC down to 615 m, with KCl/polymer mud from 615 m to 2855 m, and with Ancotemp/bentonite mud from 2855 m to TD. No shallow gas was encountered.
    Jurassic Vestland Group sandstone was encountered hydrocarbon-bearing at 2838 m. The hydrocarbon column extended 23 m into Triassic sandstone of the Skagerrak Formation. The gas/water contact was estimated to 2877 m, confirmed by FMT pressure gradients and wire line logs. The well was tested, and since no core was cut through the reservoir, the well was sidetracked at 2623 m with TD at 2940 m. The sidetrack was drilled with Ancotemp/bentonite mud. Three conventional cores were cut in the interval 2841 - 2902 m. The sidetrack was formally named 15/12-8 A.
    The FMT tool was run in well 15/12-8 and 15/12-8A. One segregated sample was taken at 2863 m in 15/12-8 (gas, condensate and mud filtrate) and another in the water zone at 2888 m in well 15/12-8 A (recovered mud only due to seal failure).
    Well 15/12-8 was permanently abandoned on 14 July 1991 as a gas/condensate discovery. The 15/12-8 A sidetrack was permanently abandoned on 29 July as a gas/condensate appraisal well.
    Testing
    One DST test was performed in 15/12-8 in the interval 2838 - 2869 m. The well produced gas-condensate with a dew point of 230 bar at the measured reservoir temperature, which was 123 deg C. The rates were 550 000 Sm3 gas and 420 Sm3 condensate /day through a 15.9 mm choke. The condensate/gas ratio was 1308 Sm3/Sm3, the condensate gravity was 61 deg API, and the gas gravity was 0.817 (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]
    620.00
    3054.00

  • 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
    TEST1
    2838.00
    2869.00
    09.07.1991 - 04:35
    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
    170.5
    36
    172.0
    0.00
    LOT
    INTERM.
    20
    601.0
    26
    603.0
    1.74
    LOT
    INTERM.
    13 3/8
    1798.0
    17 1/2
    1800.0
    1.84
    LOT
    INTERM.
    9 5/8
    2837.0
    12 1/4
    2840.0
    2.01
    LOT
    LINER
    7
    3051.0
    8 1/2
    3051.0
    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
    2838
    2869
    15.9
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    123
    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
    420
    550000
    0.817
    1308

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    ACBL VDL GR
    115
    2828
    ACL GR ZDL
    1793
    2839
    CDL CN GR
    2621
    2933
    CDL GR
    170
    484
    DIFL AC MLL GR
    2621
    2933
    DIFL ACL GR
    170
    3048
    DIPLOG GR
    2828
    3046
    FMT GR
    2838
    3009
    MLL ZDL CN GR
    2828
    3048
    MWD - GR RES DIR
    170
    3054
    VELOCITY
    485
    3045
    ZDL GR
    601
    1815

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.57
    pdf
    1.26

  • 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
    2.80
    pdf
    22.14

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    171
    1.03
    WATER BASED
    06.06.1991
    278
    1.03
    WATER BASED
    10.06.1991
    601
    1.35
    20.0
    11.0
    WATER BASED
    17.06.1991
    601
    1.35
    25.0
    12.5
    WATER BASED
    17.06.1991
    601
    1.35
    19.0
    3.0
    WATER BASED
    17.06.1991
    615
    1.03
    WATER BASED
    10.06.1991
    615
    0.00
    WATER BASED
    10.06.1991
    1036
    1.20
    15.0
    4.0
    WATER BASED
    14.06.1991
    1460
    1.30
    17.0
    4.0
    WATER BASED
    14.06.1991
    1460
    1.30
    20.0
    6.5
    WATER BASED
    14.06.1991
    1789
    1.51
    22.0
    3.5
    WATER BASED
    20.06.1991
    1789
    1.53
    26.0
    3.5
    WATER BASED
    20.06.1991
    1798
    1.51
    22.0
    3.5
    WATER BASED
    18.06.1991
    1815
    1.35
    20.0
    11.0
    WATER BASED
    17.06.1991
    1815
    1.35
    20.0
    6.5
    WATER BASED
    14.06.1991
    1815
    1.35
    25.0
    12.5
    WATER BASED
    17.06.1991
    1818
    1.40
    19.0
    3.0
    WATER BASED
    17.06.1991
    2240
    1.53
    25.0
    4.5
    WATER BASED
    21.06.1991
    2240
    1.53
    30.0
    5.0
    WATER BASED
    25.06.1991
    2240
    1.51
    22.0
    3.5
    WATER BASED
    18.06.1991
    2240
    1.51
    22.0
    3.5
    WATER BASED
    20.06.1991
    2240
    1.53
    26.0
    3.5
    WATER BASED
    20.06.1991
    2240
    1.53
    30.0
    4.5
    WATER BASED
    25.06.1991
    2240
    1.53
    31.0
    4.5
    WATER BASED
    25.06.1991
    2240
    1.53
    28.0
    5.0
    WATER BASED
    25.06.1991
    2240
    1.53
    29.0
    4.5
    WATER BASED
    26.06.1991
    2240
    1.53
    29.0
    6.0
    WATER BASED
    27.06.1991
    2482
    1.51
    22.0
    3.5
    WATER BASED
    20.06.1991
    2495
    1.53
    26.0
    3.5
    WATER BASED
    20.06.1991
    2599
    1.53
    25.0
    4.5
    WATER BASED
    21.06.1991
    2725
    1.53
    30.0
    5.0
    WATER BASED
    25.06.1991
    2812
    1.53
    30.0
    4.5
    WATER BASED
    25.06.1991
    2830
    1.53
    31.0
    4.5
    WATER BASED
    25.06.1991
    2850
    1.27
    18.0
    3.5
    WATER BASED
    01.07.1991
    2850
    1.27
    18.0
    3.5
    WATER BASED
    03.07.1991
    2850
    1.27
    18.0
    4.0
    WATER BASED
    03.07.1991
    2855
    1.53
    29.0
    6.0
    WATER BASED
    27.06.1991
    2855
    1.53
    29.0
    4.5
    WATER BASED
    26.06.1991
    2855
    1.53
    28.0
    5.0
    WATER BASED
    25.06.1991
    2907
    1.27
    21.0
    7.0
    WATER BASED
    01.07.1991
    3054
    1.27
    18.0
    3.5
    WATER BASED
    01.07.1991

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1210.0
    [m]
    DC
    GEOCH
    1250.0
    [m]
    DC
    GEOCH
    1270.0
    [m]
    DC
    GEOCH
    1280.0
    [m]
    DC
    GEOCH
    1300.0
    [m]
    DC
    GEOCH
    1310.0
    [m]
    DC
    GEOCH
    1330.0
    [m]
    DC
    GEOCH
    1340.0
    [m]
    DC
    GEOCH
    1360.0
    [m]
    DC
    GEOCH
    1370.0
    [m]
    DC
    GEOCH
    1390.0
    [m]
    DC
    GEOCH
    1400.0
    [m]
    DC
    GEOCH
    1420.0
    [m]
    DC
    GEOCH
    1430.0
    [m]
    DC
    GEOCH
    1450.0
    [m]
    DC
    GEOCH
    1460.0
    [m]
    DC
    GEOCH
    1480.0
    [m]
    DC
    GEOCH
    1490.0
    [m]
    DC
    GEOCH
    1510.0
    [m]
    DC
    GEOCH
    1520.0
    [m]
    DC
    GEOCH
    1540.0
    [m]
    DC
    GEOCH
    1550.0
    [m]
    DC
    GEOCH
    1570.0
    [m]
    DC
    GEOCH
    1580.0
    [m]
    DC
    GEOCH
    1600.0
    [m]
    DC
    GEOCH
    1610.0
    [m]
    DC
    GEOCH
    1630.0
    [m]
    DC
    GEOCH
    1640.0
    [m]
    DC
    GEOCH
    1660.0
    [m]
    DC
    GEOCH
    1670.0
    [m]
    DC
    GEOCH
    1690.0
    [m]
    DC
    GEOCH
    1700.0
    [m]
    DC
    GEOCH
    1720.0
    [m]
    DC
    GEOCH
    1730.0
    [m]
    DC
    GEOCH
    1750.0
    [m]
    DC
    GEOCH
    1760.0
    [m]
    DC
    GEOCH
    1780.0
    [m]
    DC
    GEOCH
    1790.0
    [m]
    DC
    GEOCH
    1810.0
    [m]
    DC
    GEOCH
    1822.8
    [m]
    SWC
    STATO
    1840.0
    [m]
    DC
    GEOCH
    1850.0
    [m]
    DC
    GEOCH
    1868.8
    [m]
    SWC
    STATO
    1880.0
    [m]
    DC
    GEOCH
    1900.0
    [m]
    DC
    GEOCH
    1910.0
    [m]
    DC
    GEOCH
    1930.0
    [m]
    DC
    GEOCH
    1939.8
    [m]
    SWC
    STATO
    1960.0
    [m]
    DC
    GEOCH
    1970.0
    [m]
    DC
    GEOCH
    1986.8
    [m]
    SWC
    STATO
    2000.0
    [m]
    DC
    GEOCH
    2020.0
    [m]
    DC
    GEOCH
    2030.0
    [m]
    DC
    GEOCH
    2050.0
    [m]
    DC
    GEOCH
    2067.3
    [m]
    SWC
    STATO
    2080.0
    [m]
    DC
    GEOCH
    2090.0
    [m]
    DC
    GEOCH
    2109.8
    [m]
    SWC
    STATO
    2120.0
    [m]
    DC
    GEOCH
    2130.0
    [m]
    DC
    GEOCH
    2150.0
    [m]
    DC
    GEOCH
    2160.0
    [m]
    DC
    GEOCH
    2177.3
    [m]
    SWC
    STATO
    2190.0
    [m]
    DC
    GEOCH
    2203.0
    [m]
    DC
    GEOCH
    2215.0
    [m]
    DC
    GEOCH
    2230.0
    [m]
    DC
    GEOCH
    2246.3
    [m]
    SWC
    STATO
    2251.0
    [m]
    DC
    GEOCH
    2258.8
    [m]
    SWC
    STATO
    2272.8
    [m]
    SWC
    STATO
    2286.8
    [m]
    SWC
    STATO
    2310.8
    [m]
    SWC
    STATO
    2318.8
    [m]
    SWC
    STATO
    2335.0
    [m]
    DC
    GEOCH
    2350.0
    [m]
    DC
    GEOCH
    2365.0
    [m]
    DC
    GEOCH
    2380.0
    [m]
    DC
    GEOCH
    2410.0
    [m]
    DC
    GEOCH
    2419.8
    [m]
    SWC
    STATO
    2440.0
    [m]
    DC
    GEOCH
    2831.8
    [m]
    SWC
    STATO
    2834.8
    [m]
    SWC
    STATO
    2836.8
    [m]
    SWC
    STATO
    2837.0
    [m]
    DC
    GEOCH
    2841.0
    [m]
    C
    STATO
    2843.0
    [m]
    C
    STATO
    2844.7
    [m]
    C
    STATO
    2846.5
    [m]
    C
    STATO
    2847.4
    [m]
    C
    STATO
    2848.7
    [m]
    C
    STATO
    2850.4
    [m]
    C
    STATO
    2852.8
    [m]
    C
    STATO
    2885.0
    [m]
    DC
    GEOCH
    2900.0
    [m]
    DC
    GEOCH
    2912.0
    [m]
    DC
    GEOCH
    2960.0
    [m]
    DC
    GEOCH
    2990.0
    [m]
    DC
    GEOCH
    3020.0
    [m]
    DC
    GEOCH
    3054.0
    [m]
    DC
    GEOCH