Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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10.11.2024 - 01:25
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7121/7-1

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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.
    7121/7-1
    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.
    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.
    BARENTS 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.
    7121/7-1
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    8205 - 374 SP. 377
    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.
    419-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.
    56
    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,
    11.06.1984
    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.
    05.08.1984
    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.
    05.08.1986
    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
    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.
    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.
    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.
    MIDDLE 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.
    STØ FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    22.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    329.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2160.0
    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).
    2160.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    1.3
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    72
    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 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.
    FRUHOLMEN FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    71° 28' 20.78'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    21° 5' 15.18'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    7930306.01
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    503105.18
    UTM zone
    Universal Transverse Mercator zone. Examples of legal values: 31, 32, 33, 34.
    34
    NPDID wellbore
    Norwegian Offshore Directorate's unique id for the wellbore.
    130

  • Wellbore history
    General
    Well 7121/7-1 was drilled in order to test the Lower/Middle Jurassic sandstone on the eastern part of the Albatross structure on Tromsøflaket. The primary target was defined as sandstone intervals in Early-Middle Jurassic and Late Triassic.
    Operations and results
    Wildcat well 7121/7-1 was spudded with the semi-submersible installation West Vanguard on 11 June 1984 and drilled to TD at 2160 m in the Late Triassic Fruholmen Formation. No significant problems were encountered during drilling. The well was drilled with spud mud down to 764 m and with a gypsum/polymer mud from 764 m to TD.
    Logs, RFT pressure gradients, and cores indicated gas in the Lower/Middle Jurassic sandstone (Stø Formation) encountered at a depth of 1849 m. Gas/water contact was evaluated to 1902.5 m RKB, the same as found in well 7120/9-1, also drilled on the Albatross structure. From the GWC down to TD in the well shows were observed in sandstones on cores and cuttings. Four cores were cut in the interval 1851 m to 1935 m in the Stø Formation. Two segregated samples were taken, at 1900.2 m and at 1851.0 m. The 2-3/4 gallon chamber from 1900.2 m was bled off offshore and gave an opening pressure at 2220 psig. The sample contained 58.25 cuft of gas and 1 litre of liquid consisting of 800 cc water/mud filtrate and 200 cc condensate. The 2 3/4 gallon chamber from 1850.5 m contained 2200 psig with 4500 cc water based liquid, a small volume condensate, and 41 cuft of gas.
    The well was permanently abandoned on 5 August 1984 as a gas appraisal well.
    Testing
    Two DST were performed, one water test over the interval 1947.2 m to 1960.18 m and one gas test over the interval 1867 m to 1872 m. The recorded temperatures were in agreement with those observed in well 7120/9-1. The reservoir fluids had the same composition in well 7121/7-1 as in well 7120/9-1. The sandstone in the tested water zone had good reservoir properties. The gas test flowed on average 501000 Sm3 gas/day during the main flow, with a separator gas/oil ratio of 18000 Sm3/Sm3.

  • 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]
    420.00
    2157.00

  • 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
    1851.0
    1867.1
    [m ]
    2
    1868.0
    1894.4
    [m ]
    3
    1895.0
    1922.8
    [m ]
    4
    1922.8
    1935.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    82.5
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1851-1856m
    Core photo at depth: 1856-1861m
    Core photo at depth: 1861-1866m
    Core photo at depth: 1866-1867m
    Core photo at depth: 1868-1873m
    1851-1856m
    1856-1861m
    1861-1866m
    1866-1867m
    1868-1873m
    Core photo at depth: 1873-1878m
    Core photo at depth: 1878-1883m
    Core photo at depth: 1883-1888m
    Core photo at depth: 1888-1893m
    Core photo at depth: 1893-1894m
    1873-1878m
    1878-1883m
    1883-1888m
    1888-1893m
    1893-1894m
    Core photo at depth: 1895-1900m
    Core photo at depth: 1900-1905m
    Core photo at depth: 1905-1910m
    Core photo at depth: 1910-1915m
    Core photo at depth: 1915-1920m
    1895-1900m
    1900-1905m
    1905-1910m
    1910-1915m
    1915-1920m
    Core photo at depth: 1920-1922m
    Core photo at depth: 1922-1927m
    Core photo at depth: 1927-1932m
    Core photo at depth: 1932-1935m
    Core photo at depth:  
    1920-1922m
    1922-1927m
    1927-1932m
    1932-1935m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1401.0
    [m]
    DC
    OD
    1410.0
    [m]
    DC
    OD
    1419.0
    [m]
    DC
    OD
    1428.0
    [m]
    DC
    OD
    1440.0
    [m]
    DC
    OD
    1452.0
    [m]
    DC
    OD
    1461.0
    [m]
    DC
    OD
    1473.0
    [m]
    DC
    OD
    1479.0
    [m]
    DC
    OD
    1491.0
    [m]
    DC
    OD
    1500.0
    [m]
    DC
    OD
    1509.0
    [m]
    DC
    OD
    1521.0
    [m]
    DC
    OD
    1530.0
    [m]
    DC
    OD
    1542.0
    [m]
    DC
    OD
    1551.0
    [m]
    DC
    OD
    1824.0
    [m]
    DC
    RRI
    1833.0
    [m]
    DC
    RRI
    1839.0
    [m]
    DC
    RRI
    1845.0
    [m]
    DC
    RRI
    1851.2
    [m]
    C
    RRI
    1853.9
    [m]
    C
    RRI
    1855.6
    [m]
    C
    RRI
    1858.6
    [m]
    C
    RRI
    1861.3
    [m]
    C
    RRI
    1864.8
    [m]
    C
    RRI
    1867.0
    [m]
    C
    RRI
    1870.0
    [m]
    C
    RRI
    1872.8
    [m]
    C
    RRI
    1876.9
    [m]
    C
    RRI
    1880.2
    [m]
    C
    RRI
    1883.8
    [m]
    C
    RRI
    1886.3
    [m]
    C
    RRI
    1890.7
    [m]
    C
    RRI
    1894.4
    [m]
    C
    RRI
    1896.6
    [m]
    C
    RRI
    1898.5
    [m]
    C
    RRI
    1899.8
    [m]
    C
    RRI
    1902.9
    [m]
    C
    RRI
    1905.6
    [m]
    C
    RRI
    1907.7
    [m]
    C
    RRI
    1910.7
    [m]
    C
    RRI
    1914.6
    [m]
    C
    RRI
    1915.7
    [m]
    C
    RRI
    1918.5
    [m]
    C
    RRI
    1921.3
    [m]
    C
    RRI
    1924.4
    [m]
    C
    RRI
    1926.5
    [m]
    C
    RRI
    1929.2
    [m]
    C
    RRI
    1932.6
    [m]
    C
    RRI
    1935.0
    [m]
    C
    RRI
    1938.0
    [m]
    DC
    RRI
    1944.0
    [m]
    DC
    RRI
    1950.0
    [m]
    DC
    RRI
    1956.0
    [m]
    DC
    RRI
    1962.0
    [m]
    DC
    RRI
    1968.0
    [m]
    DC
    RRI
    1974.0
    [m]
    DC
    RRI
    1980.0
    [m]
    DC
    RRI

  • 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
    DST2
    1866.00
    1871.00
    23.07.1984 - 00:00
    YES

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.33

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    3.53
    pdf
    1.22

  • 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
    13.65
    pdf
    1.15

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    1950
    1960
    67.5
    2.0
    1866
    1871
    24.4
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    21.000
    20.000
    36
    2.0
    21.000
    10.000
    18.000
    61
    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
    28
    501000
    18000

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL
    520
    1495
    CBL VDL CCL
    1300
    1975
    CET GR CCL
    1300
    1975
    CST
    800
    1498
    CST
    1540
    2142
    DLL MSFL GR
    1825
    2154
    ISF BHC GR SP CAL
    351
    1507
    ISF BHC GR SP CAL
    1854
    2157
    ISF BHC MSFL GR SP CAL
    1500
    1941
    LDL CNL NGT
    1500
    2158
    LDL GR
    415
    1505
    RFT
    1850
    1922
    RFT
    1851
    2059
    SHDT GR
    752
    2158
    VELOCITY
    540
    2150

  • 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
    415.0
    36
    419.0
    0.00
    LOT
    SURF.COND.
    20
    752.0
    26
    770.0
    1.52
    LOT
    INTERM.
    13 5/8
    1500.0
    17 1/2
    1517.0
    1.53
    LOT
    INTERM.
    9 5/8
    2160.0
    12 1/4
    2160.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    706
    1.07
    WATER BASED
    770
    1.20
    WATER BASED
    1222
    1.16
    6200.0
    WATER BASED
    1517
    1.16
    1800.0
    WATER BASED
    1517
    1.16
    2000.0
    WATER BASED
    1558
    1.14
    1200.0
    WATER BASED
    1922
    1.25
    1600.0
    WATER BASED
    2160
    1.24
    1100.0
    WATER BASED

  • 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
    0.28