Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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16.07.2024 - 01:28
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25/8-6

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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.
    25/8-6
    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.
    NORTH 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.
    25/8-6
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    ES 9403 & INLINE 2306 / CDP 1827
    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.
    Esso Exploration and Production Norway 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.
    813-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,
    19.05.1995
    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.
    27.06.1995
    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.
    27.06.1997
    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.
    29.08.2003
    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.
    APPRAISAL
    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.
    OIL
    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.
    PALEOCENE
    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.
    HEIMDAL FM
    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.
    128.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2577.0
    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).
    2569.5
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    13.4
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    88
    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.
    PALEOCENE
    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.
    EKOFISK FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 28' 18.42'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 20' 15.37'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6592927.19
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    462464.17
    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.
    2573
  • Wellbore history

    General
    Well 25/8-6 was drilled to appraise the 25/8-5 S Discovery (Jotun) resource base and to confirm the OWC. The well is located close to the crest of the field, close to the western block boundary and PL103, who participated in the well.
    The well was drilled as a possible future vertical sub-sea producer.
    Operations and results
    Appraisal well 25/8-6 was spudded with the semi-submersible installation "Vildkat Explorer" on 19 May 1995 and drilled to TD at 2565 m. The well was drilled with seawater and hi-vis pills down to 1060 m and KCl/glycol mud from 1060 m to TD. Due to bad hole condition it was impossible to get wire line logs below 1460 m. The well was plugged back on 6 June and technically sidetracked& (25/8-6T2) from just below the 13 3/8" casing at 1073 m using "Lo-Tox" mineral oil based mud. This well bore built up to 13& at 1329 m and then dropped back to vertical at 1600 m, the well was kept vertical down through the reservoir. It was drilled to TD at 2577 m in the in the Early Paleocene Ekofisk Formation. Successful wire line logging was achieved in this well bore. The well confirmed oil in the Heimdal Formation with OWC at 2090 m TVD SS (2122.6 m RKB in the technical sidetrack) in clean sand.
    Eight cores were cut in the first well bore. Two were cut in shales of the Lista Formation (2054m to 2057 m and 2057 m to 2065 m). Due to very slow coring rate, coring was discontinued and a 12 1/4" hole was drilled down to 2077 m at the next core point. Six cores were subsequently cut in Heimdal Formation sandstone in the interval 2077 m to 2137.5 m. MDT fluid samples were taken in the Heimdal Formation at 2082.2 m (oil), 2122.1 m (oil), 2123.0 m (water + ca 15% oil), 2143.5 m (water), and 2145 m (water). After running TD logs, a string of 10-3/4" x 9-5/8" production casing was run and cemented, and the well was suspended on 27 June 1995 as an oil appraisal and potential future sub sea producer.
    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]
    1070.00
    2565.00
  • 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
    2054.0
    2056.0
    [m ]
    2
    2057.0
    2063.5
    [m ]
    3
    2077.0
    2084.2
    [m ]
    4
    2084.5
    2096.9
    [m ]
    5
    2097.0
    2098.9
    [m ]
    6
    2100.0
    2109.5
    [m ]
    7
    2109.5
    2119.0
    [m ]
    8
    2119.0
    2137.5
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    67.4
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 2054-2056m
    Core photo at depth: 2057-2061m
    Core photo at depth: 2061-2063m
    Core photo at depth: 2077-2081m
    Core photo at depth: 2081-2084m
    2054-2056m
    2057-2061m
    2061-2063m
    2077-2081m
    2081-2084m
    Core photo at depth: 2084-2088m
    Core photo at depth: 2088-2092m
    Core photo at depth: 2092-2096m
    Core photo at depth: 2096-2097m
    Core photo at depth: 2097-2099m
    2084-2088m
    2088-2092m
    2092-2096m
    2096-2097m
    2097-2099m
    Core photo at depth: 2100-2104m
    Core photo at depth: 2104-2108m
    Core photo at depth: 2108-2109m
    Core photo at depth: 2109-2113m
    Core photo at depth: 2113-2117m
    2100-2104m
    2104-2108m
    2108-2109m
    2109-2113m
    2113-2117m
    Core photo at depth: 2117-2119m
    Core photo at depth: 2119-2123m
    Core photo at depth: 2123-2127m
    Core photo at depth: 2127-2131m
    Core photo at depth: 2131-2135m
    2117-2119m
    2119-2123m
    2123-2127m
    2127-2131m
    2131-2135m
    Core photo at depth: 2135-2137m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    2135-2137m
  • Palynological slides at the Norwegian Offshore Directorate

    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1200.0
    [m]
    DC
    STRAT
    1320.0
    [m]
    DC
    STRAT
    1340.0
    [m]
    DC
    STRAT
    1380.0
    [m]
    DC
    STRAT
    1400.0
    [m]
    DC
    STRAT
    1440.0
    [m]
    DC
    STRAT
    1460.0
    [m]
    DC
    STRAT
    1480.0
    [m]
    DC
    STRAT
    1510.0
    [m]
    DC
    STRAT
    1540.0
    [m]
    DC
    STRAT
    1560.0
    [m]
    DC
    STRAT
    1580.0
    [m]
    DC
    STRAT
    1610.0
    [m]
    DC
    STRAT
    1640.0
    [m]
    DC
    STRAT
    1670.0
    [m]
    DC
    STRAT
    1700.0
    [m]
    DC
    STRAT
    1730.0
    [m]
    DC
    STRAT
    1760.0
    [m]
    DC
    STRAT
    1800.0
    [m]
    DC
    STRAT
    1840.0
    [m]
    DC
    STRAT
    1870.0
    [m]
    DC
    STRAT
    1900.0
    [m]
    DC
    STRAT
    1965.0
    [m]
    DC
    STRAT
    1980.0
    [m]
    DC
    STRAT
    2030.0
    [m]
    DC
    STRAT
    2054.0
    [m]
    DC
    STRAT
    2058.0
    [m]
    DC
    STRAT
    2063.0
    [m]
    DC
    STRAT
    2078.0
    [m]
    DC
    STRAT
    2084.0
    [m]
    DC
    STRAT
    2092.0
    [m]
    DC
    STRAT
    2107.0
    [m]
    DC
    STRAT
    2108.0
    [m]
    C
    RRI
    2118.0
    [m]
    DC
    STRAT
    2120.0
    [m]
    C
    RRI
    2124.0
    [m]
    C
    RRI
    2126.0
    [m]
    C
    RRI
    2127.0
    [m]
    DC
    STRAT
    2128.0
    [m]
    C
    RRI
    2136.0
    [m]
    C
    RRI
    2137.0
    [m]
    DC
    STRAT
    2148.0
    [m]
    C
    RRI
    2477.0
    [m]
    DC
    STRAT
    2486.0
    [m]
    DC
    STRAT
    2495.0
    [m]
    DC
    STRAT
    2531.0
    [m]
    DC
    STRAT
    2558.0
    [m]
    DC
    STRAT
    2565.0
    [m]
    DC
    STRAT
  • Lithostratigraphy

  • Geochemical information

    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.70
  • 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
    54.72
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    AIT IPL HNGS ACTC PCD
    1048
    2574
    AIT IPL HNGS ACTS
    1048
    2574
    ARI GR
    1048
    1060
    ARI GR
    1048
    1060
    ARI IPL MSFL HNGS ACTS
    1048
    1460
    ARI IPL MSFL HNGS ACTS
    1048
    1060
    CBL VDL CCL GR
    1235
    2474
    CST GR
    1069
    2549
    EPT DSI GR ACTC
    1048
    2570
    LWD - GR RES DEN NEU
    2028
    2073
    LWD - GR RES DEN NEU
    2055
    2207
    LWD - GR RES DEN NEU
    2211
    2561
    MDT GR
    2082
    2201
    MWD - GR RES
    212
    1055
    MWD - GR RES
    1048
    2039
    MWD - GR RES
    1073
    2258
    MWD - GR RES
    2258
    2503
    MWD - GR RES
    2503
    2571
    VSP GR
    153
    2570
  • 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
    214.0
    36
    215.0
    0.00
    LOT
    SURF.COND.
    13 3/8
    1048.0
    17 1/2
    1050.0
    0.00
    LOT
    INTERM.
    9 5/8
    2577.0
    12 1/4
    2577.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    194
    1.13
    DUMMY
    1060
    1.32
    16.0
    WATER BASED
    1063
    1.32
    17.0
    WATER BASED
    1246
    1.43
    56.0
    OIL BASED
    1667
    1.43
    44.0
    OIL BASED
    2054
    1.35
    25.0
    WATER BASED
    2077
    1.35
    22.0
    WATER BASED
    2085
    1.35
    21.0
    WATER BASED
    2100
    1.37
    22.0
    WATER BASED
    2110
    1.37
    23.0
    WATER BASED
    2138
    1.37
    21.0
    WATER BASED
    2200
    1.53
    31.0
    WATER BASED
    2211
    1.37
    20.0
    WATER BASED
    2237
    1.43
    51.0
    OIL BASED
    2320
    1.43
    47.0
    OIL BASED
    2335
    1.37
    20.0
    WATER BASED
    2473
    1.37
    20.0
    WATER BASED
    2500
    1.43
    43.0
    OIL BASED
    2507
    1.43
    45.0
    OIL BASED
    2538
    1.43
    50.0
    OIL BASED
    2565
    1.50
    28.0
    WATER BASED
    2577
    1.43
    45.0
    OIL 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
    0.22