Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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31.12.2024 - 01:26
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25/7-1 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.
    25/7-1 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
    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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    25/7-1
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    CN 8525 - 11 SP. 326
    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.
    Conoco Norway Inc.
    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.
    512-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.
    97
    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,
    14.04.1986
    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.
    19.07.1986
    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.
    19.07.1988
    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.
    10.01.2010
    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.
    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.
    25.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    127.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3592.0
    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).
    3495.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    32
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    114
    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.
    PRE-DEVONIAN
    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.
    BASEMENT
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 18' 35.23'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 16' 5.37'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6574928.80
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    458330.76
    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.
    898

  • Wellbore history
    General
    Well 25/7-1 S was drilled in the southern part of the Viking Graben, close to the UK border. The primary objective was test Late Jurassic sands in a down thrown fault block located northwest of the Balder Field. Secondary objectives were Middle Jurassic sandstones and the Paleocene Heimdal Formation sands, if developed. Prognosed TD was 4525 m.
    Operations and results
    Wildcat well 25/7 1S was spudded with the semi-submersible installation Nortrym on 14 April 1986 and drilled to TD at 3592 m in Silurian basement. While tripping from 1525 m the pipe became stuck and this resulted in a 38 m fish being left in the hole from 1067 to 1105 m. The kick off to bypass the fish was at 1024 m. The hole was then drilled to 2094 m before becoming stuck at 1930 m during a trip. The drill string was freed again after 5 days. Drilling then proceeded to 2477 m at which depth the pipe became stuck for a further 17 hours. The well was drilled with seawater down to 1024 and with KCl/polymer mud from 1024 m to TD. Two % diesel was added to the mud below 3241 m to alleviate high torque.
    The original geological model for the prospect was wrong. Jurassic - Devonian rocks were not found. A possible explanation is that drilling took place along a fault zone. No good hydrocarbon indications or fluorescence were observed in the well. One sample at 2084 m (Balder Formation) was described as having an orange/brown medium fluorescence, occasionally bright, with a fast, strong, cream/white fluorescent cut.
    One core was cut at 3547.0 - 3554.8 m across an indeterminate, possibly Triassic section overlying basement, and a second at 3589.0 - 3592.0 m in basement rock. No wire line fluid samples were taken.
    The well was permanently abandoned on 19 July 1986 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]
    260.00
    3590.00

  • 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
    3589.0
    3591.5
    [m ]
    2
    3547.0
    3554.8
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    10.4
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3547-3555m
    Core photo at depth: 3547-3555m
    Core photo at depth: 3547-3555m
    Core photo at depth: 3547-3555m
    Core photo at depth: 3547-3555m
    3547-3555m
    3547-3555m
    3547-3555m
    3547-3555m
    3547-3555m
    Core photo at depth: 3547-3555m
    Core photo at depth: 3547-3555m
    Core photo at depth: 3547-3555m
    Core photo at depth: 3547-3555m
    Core photo at depth: 3547-3555m
    3547-3555m
    3547-3555m
    3547-3555m
    3547-3555m
    3547-3555m
    Core photo at depth: 3547-3555m
    Core photo at depth: 3547-3555m
    Core photo at depth: 3547-3555m
    Core photo at depth: 3547-3555m
    Core photo at depth: 3589-3592m
    3547-3555m
    3547-3555m
    3547-3555m
    3547-3555m
    3589-3592m
    Core photo at depth: 3589-3592m
    Core photo at depth: 3589-3592m
    Core photo at depth: 3589-3592m
    Core photo at depth: 3589-3592m
    Core photo at depth:  
    3589-3592m
    3589-3592m
    3589-3592m
    3589-3592m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1901.0
    [m]
    DC
    RRI
    1919.0
    [m]
    DC
    RRI
    1940.0
    [m]
    DC
    RRI
    1961.0
    [m]
    DC
    RRI
    1979.0
    [m]
    DC
    RRI
    2000.0
    [m]
    DC
    RRI
    2009.0
    [m]
    DC
    RRI
    2024.0
    [m]
    DC
    RRI
    2069.0
    [m]
    DC
    RRI
    2081.0
    [m]
    DC
    RRI
    2090.0
    [m]
    DC
    RRI
    2111.0
    [m]
    DC
    RRI
    2120.0
    [m]
    DC
    RRI
    2141.0
    [m]
    DC
    RRI
    2159.0
    [m]
    DC
    RRI
    2411.0
    [m]
    DC
    RRI
    2447.0
    [m]
    DC
    RRI

  • Lithostratigraphy

  • 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
    2.68
    pdf
    13.83

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    HRT CCL
    60
    2300
    ISF LSL MSFL GR
    3285
    2401
    ISF SLS GR SP
    3272
    3349
    ISF SLS GR SP
    3450
    3592
    ISF SLS MSFL GR
    252
    2200
    LDL CNL GR
    1010
    2201
    LDL CNL GR
    2523
    2808
    LDL CNL GR
    3272
    3592
    SHDT GR
    3272
    3592
    VELOCITY
    1000
    3575
    WST VSP
    1000
    3575

  • 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
    252.0
    36
    252.0
    0.00
    LOT
    INTERM.
    20
    1009.0
    26
    1024.0
    0.00
    LOT
    INTERM.
    13 3/8
    2396.0
    17 1/2
    2409.0
    0.00
    LOT
    INTERM.
    9 5/8
    3273.0
    12 1/4
    3286.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    252
    1.04
    60.0
    2681.0
    WATER BASED
    16.04.1986
    727
    1.13
    WATER BASED
    18.04.1986
    1024
    1.10
    WATER BASED
    21.04.1986
    1108
    1.20
    20.0
    25.0
    WATER BASED
    02.05.1986
    1151
    1.08
    10.0
    20.0
    WATER BASED
    25.04.1986
    1525
    1.20
    18.0
    23.0
    WATER BASED
    28.04.1986
    1725
    1.28
    24.0
    29.0
    WATERBASED
    06.05.1986
    1934
    1.30
    24.0
    29.0
    WATERBASED
    06.05.1986
    2094
    1.32
    24.0
    20.0
    WATERBASED
    12.05.1986
    2094
    0.00
    32.0
    22.0
    WATERBASED
    13.05.1986
    2167
    1.32
    34.0
    27.0
    WATER BASED
    19.05.1986
    2233
    1.32
    37.0
    23.0
    WATER BASED
    19.05.1986
    2378
    1.32
    38.0
    26.0
    WATER BASED
    19.05.1986
    2409
    1.31
    40.0
    36.0
    WATERBASED
    23.05.1986
    2409
    1.33
    38.0
    20.0
    WATERBASED
    05.06.1986
    2468
    1.32
    38.0
    30.0
    WATERBASED
    05.06.1986
    3206
    1.40
    30.0
    25.0
    WATERBASED
    15.06.1986
    3220
    1.50
    41.0
    15.0
    WATERBASED
    16.06.1986
    3241
    1.56
    40.0
    15.0
    WATERBASED
    17.06.1986
    3285
    1.68
    47.0
    16.8
    WATERBASED
    19.06.1986
    3286
    1.73
    47.0
    14.4
    WATERBASED
    22.06.1986
    3383
    1.90
    38.0
    12.4
    WATERBASED
    29.06.1986
    3421
    1.90
    38.0
    10.5
    WATERBASED
    29.06.1986
    3476
    1.92
    38.0
    10.5
    WATERBASED
    02.07.1986
    3592
    1.92
    28.0
    8.6
    WATERBASED
    13.07.1986
    3592
    0.00
    28.0
    8.6
    WATERBASED
    13.07.1986
    3592
    0.00
    25.0
    7.2
    WATERBASED
    16.07.1986
    3592
    0.00
    19.0
    4.3
    WATERBASED
    17.07.1986
    3592
    0.00
    WATERBASED
    19.07.1986