Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
sodir.no    Norsk
sodir.no          Norsk
22.12.2024 - 01:25
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25/10-1

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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.
    25/10-1
    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.
    SUSPENDED
    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
    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.
    25/10-1
    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.
    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.
    32-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.
    74
    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,
    04.08.1969
    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.
    16.10.1969
    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.
    16.10.1971
    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.
    26.05.2009
    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.
    SHOWS
    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.
    10.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    124.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    1747.0
    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).
    1747.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    4.9
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    76
    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.
    SELE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 11' 21.72'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 19' 11.83'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6561488.14
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    461142.95
    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.
    441

  • Wellbore history
    General
    Well 25/10-1 is located in the western part of the Balder Field in the North Sea. It was drilled on the crest of an Eocene structure up dip from the 25/11-1 Balder Discovery well, which had thin, oil-bearing Lower Eocene sands underlain by wet Paleocene sands. The purpose was to test this structure, and it was anticipated that 25/10-1 would find the Paleocene sands structurally higher and oil-bearing.
    Operations and results
    Appraisal well 25/10-1 was spudded with the vessel Glomar Grand Isle on 4 August 1969. The pipe got stuck at 1572 m. Fishing was unsuccessful and a technical sidetrack was made. The well was drilled to 1747 m (TD) into Paleocene shale belonging to the Sele Formation, where it was plugged and suspended due to severe winter autumn storms. A later re-entry would complete the well objectives. Initial drilling from the set floor to 997 m was with sea water and gel. From 997 m to TD, the mud system consisted of seawater/spersene XP-20, Splinex mud.
    Down to top Oligocene at 1247 m the sediments were composed of soft clays and unconsolidated sands and silts with no indication of hydrocarbons. The lower part of the well section (Early Eocene, Balder Formation) was predominantly grey shale with very thin sands developed below a volcanic ash zone near the base. These sands had good oil shows and tested 24.8 - 25.1 deg API gravity oil on wire line formation tests in the re-entry well 25/10-1 R, but were too thin to be considered commercial.
    The section from 1664.8 to TD in this well was cored all through in eight cores, with near 100% total recovery. A further five cores in partially overlapping lithology, were cut in the re-entry well 25/10-1 R. No wire line tests were performed in this well, but a number of wire line FITs, including fluid sampling, were taken in the re-entry well.
    The well was suspended on 16 October 1969. It is classified as a well with shows.
    Testing
    No drill stem test was performed.

  • Cuttings at the Norwegian Offshore Directorate
    Cuttings at the Norwegian Offshore Directorate
    Cuttings available for sampling?
    NO
    Cuttings at the Norwegian Offshore Directorate
    Cutting sample, top depth [m]
    Cutting samples, bottom depth [m]
    385.57
    1706.88

  • 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
    5480.0
    5517.0
    [ft ]
    2
    5517.0
    5549.0
    [ft ]
    3
    5550.0
    5605.0
    [ft ]
    4
    5605.0
    5645.0
    [ft ]
    5
    5645.0
    5688.0
    [ft ]
    6
    5688.0
    5705.0
    [ft ]
    7
    5705.0
    5719.0
    [ft ]
    8
    5719.0
    5733.0
    [ft ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    76.8
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 5480-5487ft
    Core photo at depth: 5487-5497ft
    Core photo at depth: 5497-5508ft
    Core photo at depth: 5508-5517ft
    Core photo at depth: 5517-5526ft
    5480-5487ft
    5487-5497ft
    5497-5508ft
    5508-5517ft
    5517-5526ft
    Core photo at depth: 5526-5537ft
    Core photo at depth: 5537-5549ft
    Core photo at depth: 5550-5560ft
    Core photo at depth: 5560-5572ft
    Core photo at depth: 5572-5584ft
    5526-5537ft
    5537-5549ft
    5550-5560ft
    5560-5572ft
    5572-5584ft
    Core photo at depth: 5584-5596ft
    Core photo at depth: 5596-5605ft
    Core photo at depth: 5605-5613ft
    Core photo at depth: 5619-5628ft
    Core photo at depth: 4528-5636ft
    5584-5596ft
    5596-5605ft
    5605-5613ft
    5619-5628ft
    4528-5636ft
    Core photo at depth: 5636-5645ft
    Core photo at depth: 5645-5453ft
    Core photo at depth: 5653-5662ft
    Core photo at depth: 5662-5671ft
    Core photo at depth: 5671-5680ft
    5636-5645ft
    5645-5453ft
    5653-5662ft
    5662-5671ft
    5671-5680ft
    Core photo at depth: 5688-5696ft
    Core photo at depth: 5696-5705ft
    Core photo at depth: 5705-5713ft
    Core photo at depth: 5713-5719ft
    Core photo at depth: 5719-5727ft
    5688-5696ft
    5696-5705ft
    5705-5713ft
    5713-5719ft
    5719-5727ft
    Core photo at depth: 5727-5733ft
    Core photo at depth: 5680-5687ft
    Core photo at depth: 5687-5696ft
    Core photo at depth: 5696-5705ft
    Core photo at depth: 5705-5714ft
    5727-5733ft
    5680-5687ft
    5687-5696ft
    5696-5705ft
    5705-5714ft
    Core photo at depth: 5725-5732ft
    Core photo at depth: 5732-5741ft
    Core photo at depth: 5741-5750ft
    Core photo at depth: 5750-5756ft
    Core photo at depth: 5767-5776ft
    5725-5732ft
    5732-5741ft
    5741-5750ft
    5750-5756ft
    5767-5776ft
    Core photo at depth: 5776-5785ft
    Core photo at depth: 5785-5794ft
    Core photo at depth: 5794-5797ft
    Core photo at depth: 5799-5859ft
    Core photo at depth: 5799-5859ft
    5776-5785ft
    5785-5794ft
    5794-5797ft
    5799-5859ft
    5799-5859ft
    Core photo at depth: 5799-5859ft
    Core photo at depth: 5799-5859ft
    Core photo at depth: 5799-5859ft
    Core photo at depth: 5799-5859ft
    Core photo at depth: 5799-5859ft
    5799-5859ft
    5799-5859ft
    5799-5859ft
    5799-5859ft
    5799-5859ft
    Core photo at depth: 5859-5919ft
    Core photo at depth: 5859-5919ft
    Core photo at depth: 5859-5919ft
    Core photo at depth: 5859-5919ft
    Core photo at depth: 5859-5919ft
    5859-5919ft
    5859-5919ft
    5859-5919ft
    5859-5919ft
    5859-5919ft
    Core photo at depth: 5859-5919ft
    Core photo at depth: 5859-5919ft
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    5859-5919ft
    5859-5919ft

  • 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
    162.0
    36
    170.0
    0.00
    LOT
    SURF.COND.
    20
    380.0
    26
    386.0
    0.00
    LOT
    INTERM.
    13 3/8
    1045.0
    17 1/2
    1061.0
    0.00
    LOT
    INTERM.
    9 5/8
    1370.0
    12 1/4
    1385.0
    0.00
    LOT
    OPEN HOLE
    1747.0
    8 1/2
    1747.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    DIP
    380
    1746
    FDC
    380
    1074
    GR
    123
    380
    IEL
    380
    1746
    MLL
    380
    1073
    SON BHC GR
    380
    1743
    VELOCITY
    380
    1740

  • 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
    1.33
    pdf
    3.46

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    162
    1.00
    sea water
    380
    1.01
    sea water
    1045
    0.00
    spersen
    1370
    1.13
    spersen
    1754
    1.14
    spersen

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    0.0
    [m]
    C
    1718.7
    [m]
    C
    1718.7
    [m]
    C
    1723.8
    [m]
    C
    1723.8
    [m]
    C
    1735.8
    [m]
    C
    1735.8
    [m]
    C
    1737.8
    [m]
    C
    1737.8
    [m]
    C
    1745.5
    [m]
    C
    1745.5
    [m]
    C
    1748.8
    [m]
    C
    1748.8
    [m]
    C
    1804.0
    [m]
    C
    1804.0
    [m]
    C
    1841.0
    [ft]
    SWC
    2221.0
    [ft]
    SWC
    2490.0
    [ft]
    DC
    2566.0
    [ft]
    SWC
    2608.0
    [ft]
    SWC
    2608.0
    [ft]
    DC
    2717.0
    [ft]
    SWC
    2790.0
    [ft]
    DC
    2880.0
    [ft]
    DC
    3000.0
    [ft]
    DC
    3090.0
    [ft]
    DC
    3180.0
    [ft]
    DC
    3270.0
    [ft]
    DC
    3300.0
    [ft]
    DC
    3390.0
    [ft]
    DC
    3490.0
    [ft]
    DC
    3510.0
    [ft]
    DC
    3580.0
    [ft]
    DC
    3670.0
    [ft]
    DC
    3790.0
    [ft]
    DC
    3880.0
    [ft]
    DC
    4000.0
    [ft]
    DC
    4060.0
    [ft]
    DC
    4090.0
    [ft]
    DC
    4120.0
    [ft]
    DC
    4180.0
    [ft]
    DC
    4180.0
    [ft]
    DC
    4210.0
    [ft]
    DC
    4270.0
    [ft]
    DC
    4300.0
    [ft]
    DC
    4390.0
    [ft]
    DC
    4420.0
    [ft]
    DC
    4502.0
    [ft]
    SWC
    4540.0
    [ft]
    DC
    4557.0
    [ft]
    SWC
    4570.0
    [ft]
    DC
    4596.0
    [ft]
    SWC
    4600.0
    [ft]
    DC
    4630.0
    [ft]
    DC
    4660.0
    [ft]
    DC
    4700.0
    [ft]
    SWC
    4720.0
    [ft]
    DC
    4750.0
    [ft]
    DC
    4780.0
    [ft]
    DC
    4820.0
    [ft]
    SWC
    4840.0
    [ft]
    DC
    4900.0
    [ft]
    DC
    4918.0
    [ft]
    SWC
    4930.0
    [ft]
    DC
    4960.0
    [ft]
    DC
    4990.0
    [ft]
    DC
    5010.0
    [ft]
    SWC
    5020.0
    [ft]
    DC
    5050.0
    [ft]
    DC
    5140.0
    [ft]
    DC
    5197.0
    [ft]
    SWC
    5200.0
    [ft]
    SWC
    5250.0
    [ft]
    DC
    5295.0
    [ft]
    SWC
    5350.0
    [ft]
    SWC
    5350.0
    [ft]
    DC
    5400.0
    [ft]
    SWC
    5410.0
    [ft]
    SWC
    5420.0
    [ft]
    SWC
    5432.0
    [ft]
    SWC
    5450.0
    [ft]
    SWC
    5450.0
    [ft]
    DC
    5460.0
    [ft]
    SWC
    5485.0
    [ft]
    C
    5489.0
    [ft]
    C
    5490.0
    [ft]
    DC
    5490.5
    [ft]
    SWC
    5492.5
    [ft]
    C
    5493.0
    [ft]
    C
    5509.0
    [ft]
    C
    5510.0
    [ft]
    C
    5535.0
    [ft]
    C
    5549.0
    [ft]
    C
    5550.0
    [ft]
    C
    5550.0
    [ft]
    DC
    5559.0
    [ft]
    C
    5560.0
    [ft]
    C
    5580.0
    [ft]
    DC
    5586.0
    [ft]
    C
    5602.0
    [ft]
    C
    5626.0
    [ft]
    C
    5675.0
    [ft]
    C
    5682.0
    [ft]
    C
    5691.0
    [ft]
    SWC
    5697.0
    [ft]
    C
    5698.0
    [ft]
    C
    5700.0
    [ft]
    C
    5704.0
    [ft]
    C
    5710.0
    [ft]
    C
    5713.0
    [ft]
    C
    5720.0
    [ft]
    DC
    5729.0
    [ft]
    C
    5734.0
    [ft]
    C
    5748.0
    [ft]
    C
    5750.0
    [ft]
    DC
    5755.0
    [ft]
    C
    5780.0
    [ft]
    DC
    5784.0
    [ft]
    C
    5786.0
    [ft]
    C
    5795.0
    [ft]
    C
    5797.0
    [ft]
    C
    5800.0
    [ft]
    DC
    5806.0
    [ft]
    C
    5810.0
    [ft]
    C
    5814.0
    [ft]
    C
    5817.0
    [ft]
    C
    5828.0
    [ft]
    C
    5828.0
    [ft]
    C
    5829.0
    [ft]
    C
    5874.0
    [ft]
    SWC
    5900.0
    [ft]
    DC
    5911.0
    [ft]
    C
    5916.0
    [ft]
    SWC
    5919.0
    [ft]
    C
    5920.0
    [ft]
    DC
    5959.0
    [ft]
    C
    5970.0
    [ft]
    DC
    5980.0
    [ft]
    SWC
    6000.0
    [ft]
    DC
    6026.0
    [ft]
    SWC
    6080.0
    [ft]
    DC
    6090.0
    [ft]
    SWC
    6106.0
    [ft]
    SWC
    6134.0
    [ft]
    SWC
    6181.0
    [ft]
    SWC
    6200.0
    [ft]
    DC
    6214.0
    [ft]
    SWC
    6250.0
    [ft]
    SWC
    6262.0
    [ft]
    SWC
    6272.0
    [ft]
    SWC
    6290.0
    [ft]
    DC
    6294.0
    [ft]
    SWC
    6310.0
    [ft]
    SWC
    6334.0
    [ft]
    SWC
    6390.0
    [ft]
    SWC
    6396.0
    [ft]
    SWC
    6400.0
    [ft]
    DC
    6412.0
    [ft]
    SWC
    6426.0
    [ft]
    SWC
    6436.0
    [ft]
    SWC
    6450.0
    [ft]
    SWC
    6450.0
    [ft]
    DC
    6488.0
    [ft]
    SWC
    6500.0
    [ft]
    DC
    6548.0
    [ft]
    SWC
    6556.0
    [ft]
    SWC
    6580.0
    [ft]
    SWC
    6600.0
    [ft]
    DC
    6609.0
    [ft]
    SWC
    6618.0
    [ft]
    SWC
    6630.0
    [ft]
    SWC
    6641.0
    [ft]
    SWC
    6662.0
    [ft]
    SWC
    6683.0
    [ft]
    SWC
    6700.0
    [ft]
    DC
    6724.0
    [ft]
    SWC
    6724.0
    [ft]
    SWC
    6736.0
    [ft]
    SWC
    6746.0
    [ft]
    SWC
    6774.0
    [ft]
    SWC
    6782.0
    [ft]
    SWC
    6800.0
    [ft]
    DC
    6812.0
    [ft]
    SWC
    6834.0
    [ft]
    SWC
    6840.0
    [ft]
    SWC
    6850.0
    [ft]
    DC