Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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26.11.2024 - 01:27
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7/7-1

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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.
    7/7-1
    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).
    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.
    7/7-1
    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.
    626-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.
    53
    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,
    30.12.1989
    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.
    20.02.1990
    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.
    20.02.1992
    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.
    08.03.2004
    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.
    83.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3500.0
    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).
    3497.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    6.9
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    140
    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.
    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.
    57° 24' 56.88'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 15' 59.74'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6364053.40
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    455943.56
    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.
    1492

  • Wellbore history
    General
    Well 7/7-1 was the first well in license 148, and was designed to drill a tilted block on the Jæren High close to the UK border. Early/Middle Jurassic events resulted in uplift and erosion, such that Jurassic sediments at the well location are missing. Due to the Tertiary uplift and eastward tilting of the Shetland Platform, along with a relative drop in sea level, this tilting gave rise to an eastward drainage pattern. Submarine fan sandstones derived from deltaic and barrier bar complexes in the Morray Firth area were deposited in the Central Graben and on to the Jæren High. Several lobe systems developed, giving rise to continuous and periodic sandstone deposition as the lobes migrated laterally. The eastern pinch out of these systems occurs in blocks 7/4 and 7/7. The primary objective of this well was an anticlinal closure at the Base Cretaceous Unconformity level, the C-prospect, Triassic sandstones. The secondary objective was the B-prospect, Paleocene sandstones, a possible closure along a pinch out of a sandy sequence consisting of distal turbidites. Some high amplitude anomalies indicated shallow gas between 241 to 395 m. The nearest one at 308 m was situated approximately 300 m east of the well location. Sticky and swelling "gumbo" clays are common in the area.
    Operations and results
    Wildcat well 7/7-1 was spudded with the semi-submersible installation Deepsea Bergen 30 December 1989 and drilled to TD at 3500 m in the Triassic Smith Bank Formation. The well was drilled with seawater and gel down to 572 m, with gypsum/polymer mud from 572 m to 3263 m, and with bentonite/lignosulphonate mud from 3263 m to TD. Apart from some tight hole problems, drilling went without severe problems. No shallow gas was encountered. The well was drilled approximately 200 m into the Triassic, which consisted of brick red sandstones, interbedded with siltstone / claystone. The Paleocene sandstones came in nearly 60 m below the prognosed depth, and only minor amounts of sand was encountered (Andrew Formation). No indication of hydrocarbons was seen in this well. Two conventional cores were cut, one from 2786 m to 2803 m in the Paleocene Andrew Formation and a second from 3286 m to 3313.5 m driller's depth (3291.5 m to 3319 m loggers depth) in the Smith Bank Formation. A total of 125 sidewall cores were attempted, and 118 sidewall cores were recovered. No fluid samples were taken. The well was permanently abandoned on 20 February 1990 as a dry hole.
    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]
    590.00
    3500.00

  • 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
    2786.0
    2803.0
    [m ]
    2
    3296.0
    3313.5
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    34.5
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 2786-2791m
    Core photo at depth: 2791-2796m
    Core photo at depth: 2796-2801m
    Core photo at depth: 2801-2803m
    Core photo at depth: 3286-3291m
    2786-2791m
    2791-2796m
    2796-2801m
    2801-2803m
    3286-3291m
    Core photo at depth: 3291-3296m
    Core photo at depth: 3296-3301m
    Core photo at depth: 3301-3306m
    Core photo at depth: 3306-3311m
    Core photo at depth: 3311-3313m
    3291-3296m
    3296-3301m
    3301-3306m
    3306-3311m
    3311-3313m

  • 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
    167.0
    36
    168.0
    0.00
    LOT
    INTERM.
    20
    567.0
    26
    580.0
    1.64
    LOT
    INTERM.
    13 3/8
    2548.0
    18
    2565.0
    1.86
    LOT
    INTERM.
    9 5/8
    3251.0
    12 1/4
    3263.0
    1.63
    LOT
    OPEN HOLE
    3500.0
    8 1/2
    3500.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL GR
    1333
    2554
    CBL VDL GR
    1903
    3253
    DIFL ACL CDL CNL GR
    2548
    3260
    DIFL ACL CDL CNL GR
    3253
    3502
    DIFL ACL CDL GR
    567
    2567
    DIPS GR
    3254
    3499
    FMT GR
    3290
    3317
    MLL SPL
    3253
    3505
    MWD
    572
    3500
    SWC GR
    2021
    2566
    SWC GR
    2649
    3258
    SWC GR
    3260
    3503
    VSP
    100
    3490

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.57

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.23

  • 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
    18.43

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    576
    1.03
    WATER BASED
    05.01.1990
    580
    1.03
    WATER BASED
    05.01.1990
    580
    1.03
    WATER BASED
    08.01.1990
    2565
    1.56
    29.0
    6.0
    WATER BASED
    16.01.1990
    2565
    1.56
    26.0
    6.0
    WATER BASED
    16.01.1990
    2565
    1.56
    25.0
    5.0
    WATER BASED
    17.01.1990
    2568
    1.50
    21.0
    5.0
    WATER BASED
    24.01.1990
    2685
    1.50
    22.0
    4.0
    WATER BASED
    25.01.1990
    2690
    1.50
    21.0
    4.5
    WATER BASED
    26.01.1990
    2764
    1.50
    22.0
    6.0
    WATER BASED
    29.01.1990
    2786
    1.50
    21.0
    5.0
    WATER BASED
    29.01.1990
    2803
    1.50
    23.0
    5.0
    WATER BASED
    29.01.1990
    2903
    1.50
    24.0
    6.5
    WATER BASED
    30.01.1990
    2997
    1.50
    27.0
    6.0
    WATER BASED
    31.01.1990
    3047
    1.50
    27.0
    5.5
    WATER BASED
    02.02.1990
    3054
    1.50
    25.0
    4.5
    WATER BASED
    05.02.1990
    3114
    1.50
    25.0
    5.0
    WATER BASED
    06.02.1990
    3263
    1.50
    25.0
    5.5
    WATER BASED
    07.02.1990
    3263
    1.50
    23.0
    5.0
    WATER BASED
    07.02.1990
    3263
    1.50
    27.0
    5.0
    WATER BASED
    08.02.1990
    3284
    1.55
    45.0
    6.0
    WATER BASED
    12.02.1990
    3284
    1.55
    43.0
    6.5
    WATER BASED
    14.02.1990
    3284
    1.55
    42.0
    5.0
    WATER BASED
    14.02.1990
    3284
    1.55
    43.0
    5.5
    WATER BASED
    15.02.1990
    3294
    1.55
    40.0
    12.5
    WATER BASED
    20.02.1990
    3294
    1.55
    40.0
    10.0
    WATER BASED
    20.02.1990
    3294
    1.55
    43.0
    5.5
    WATER BASED
    16.02.1990
    3294
    1.55
    42.0
    10.5
    WATER BASED
    20.02.1990
    3365
    1.55
    43.0
    6.5
    WATER BASED
    14.02.1990

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2022.0
    [m]
    SWC
    STATO
    2074.0
    [m]
    SWC
    STATO
    2111.0
    [m]
    SWC
    STATO
    2122.0
    [m]
    SWC
    STATO
    2135.0
    [m]
    SWC
    STATO
    2143.2
    [m]
    SWC
    STATO
    2175.0
    [m]
    SWC
    STATO
    2225.0
    [m]
    SWC
    STATO
    2275.0
    [m]
    SWC
    STATO
    2310.0
    [m]
    SWC
    STATO
    2325.0
    [m]
    SWC
    STATO
    2344.0
    [m]
    SWC
    STATO
    2360.0
    [m]
    SWC
    STATO
    2382.2
    [m]
    SWC
    STATO
    2400.0
    [m]
    SWC
    STATO
    2415.0
    [m]
    SWC
    STATO
    2431.0
    [m]
    SWC
    STATO
    2450.0
    [m]
    SWC
    STATO
    2464.0
    [m]
    SWC
    STATO
    2479.0
    [m]
    SWC
    STATO
    2500.0
    [m]
    SWC
    STATO
    2513.5
    [m]
    SWC
    STATO
    2530.0
    [m]
    SWC
    STATO
    2545.0
    [m]
    SWC
    STATO
    2560.0
    [m]
    SWC
    STATO
    2580.0
    [m]
    DC
    RRI
    2595.0
    [m]
    DC
    RRI
    2610.0
    [m]
    DC
    RRI
    2625.0
    [m]
    DC
    RRI
    2640.0
    [m]
    DC
    RRI
    2649.5
    [m]
    SWC
    STATO
    2658.5
    [m]
    SWC
    STATO
    2679.0
    [m]
    DC
    RRI
    2694.0
    [m]
    DC
    RRI
    2706.0
    [m]
    SWC
    STATO
    2724.0
    [m]
    DC
    RRI
    2739.0
    [m]
    DC
    RRI
    2742.0
    [m]
    SWC
    STATO
    2753.0
    [m]
    SWC
    STATO
    2758.3
    [m]
    SWC
    STATO
    2769.0
    [m]
    DC
    RRI
    2790.2
    [m]
    SWC
    STATO
    2793.0
    [m]
    SWC
    STATO
    2795.3
    [m]
    SWC
    STATO
    2798.1
    [m]
    SWC
    STATO
    2801.9
    [m]
    SWC
    STATO
    2826.0
    [m]
    DC
    RRI
    2832.0
    [m]
    DC
    RRI
    2958.0
    [m]
    SWC
    STATO
    3433.2
    [m]
    SWC
    STATO
    3503.9
    [m]
    SWC
    STATO