Factpages Norwegian petroleum directorate
NPD          Norsk

25/11-1

Export: 
  • General information

    General information
    Attribute Value
    Wellbore name
    Official name of wellbore based on NPD guidelines for designation of wells and wellbores.
    25/11-1
    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 NPD.
    INJECTING: It was injected to the wellbore at the time of the operators last monthly report to the NPD.
    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 NPD guidelines for designation of wells and wellbores.
    25/11-1
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    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 NPD.
    2-L
    Drilling facility
    NPD's name of the facility which the wellbore was drilled from.
    Drilling days
    Number of days from spud to completed. The first and last days of the operation is included in the count. Days where the drilling operations has been suspende, is not included. Days used for predrilling is not included. These are made available where applicable.
    265
    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,
    18.10.1966
    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.
    09.07.1967
    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.
    09.07.1969
    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.
    19.12.2007
    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.
    OIL
    Discovery wellbore
    Indicator which telles if the wellbore made a new discovery. Legal values: YES, NO.
    YES
    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 NPD bulletins.
    EOCENE
    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 NPD bulletins.
    INTRA BALDER FM SS
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    27.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    126.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2459.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    2.75
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    71
    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° 10' 57.35'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 24' 24.89'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6560686.91
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    466105.01
    UTM zone
    Universal Transverse Mercator zone. Examples of legal values: 31, 32, 33, 34.
    31
    NPDID wellbore
    NPD's unique id for the wellbore.
    143
  • Wellbore history

    General
    Well 25/11-1 is located on the Utsira High in the Northern North Sea. The objective of the well was to test the hydrocarbon potential of the sedimentary section; to investigate the lithology and sequence in this portion of the North Sea basin; and to partially fulfil Esso's drilling obligation to the Norwegian Government incurred on behalf of the Licenses.
    Operations and results
    Wildcat well 25/11-1 was spudded with the semi-submersible installation Ocean Traveler on and drilled to TD at 2459 m in Basement rock. Actual drilling problems with the 25/11-1 were few. However, other major problems occurred. The number 2 column of Ocean Traveler was bumped by a supply boat on 6 November and began taking water. On 18 November, 1966 the rig was towed to Stavanger for repairs. By 14 April, 1967 the rig was able to continue drilling at the 25/11-1 location. Bad weather caused a new break in the drilling operations from 17 April to 10 May.
    From the sea floor to 370 m (1213'), the hole was drilled with sea water and gel. Returns in this interval were to the sea floor. Below 370 m to total depth a sea water slurry with Bentonite, Zeogel, Spersene, XP-20, Caustic Soda and 0 -12% diesel oil was used.
    First show in the well was reported in thin siltstone and sandstone bands at ca1690 m. Gas and live oil were found in Paleocene clastic sediments (Balder Formation; top has been set at 1698). The recovered cores from this interval (1726.7 to 1745.9 m) showed a predominantly shale section containing interbedded tuffaceous siltstone and sandstone. The shale bled gas throughout and developed a film of oil along fractured surfaces. The siltstone, though tight, bled oil at the base of most beds. The sandstone, whether 1/2 inch or three feet thick, was saturated with live oil which gave a yellow fluorescence and a streaming yellow-white or blue-white cut. Two FIT tests at 1755 and 1777 m yielded oil and gas, while a FIT at 1801.4 m recovered salt water and mud. An OWC was set at 1783 m. In this early phase of exploration in the North Sea, this was encouraging. The prospective reservoir rocks, however, were too thin to justify further tests in this well.
    Fourteen cores were cut in the well.  Core 1 was cut from 991.2 to 1000.3 m in the Hordaland Group; core no 2 from 1097.2 to 1104.9 m gave no recovery; core 3 was cut from 1104.9 to 1109.4 m in the Skade Formation, cores 4, 5, and 6 from 1726.7 to 1745.9 m in the Balder Formation; cores 7 and 8 from 1876.9 to 1904.0 m in the Ty and Ekofisk Formations; core 9 from 1956.8 to 1960.6 m in the Sola Formation, core 10 from 2013.5 to 2022.6 m in the Statfjord Formation; cores 11 and 12 in the interval 2186.9 to 2363.0 m in the Skagerrak Formation; and cores 13 and 14 in the interval 2391.1 to 2459.4      in Basement rocks. Fifteen Formation Interval Tests (FIT) were attempted. The test at 1755 m recovered 323 litre gas and 6 litre of 22.3 deg API oil, while the one at 1777 recovered 535 litre gas and 7 litre of 20.2 deg API oil. Tests at 1801, 4 m, 1873.3 m, 2007.4 m, and 2196.4 m all yielded salt water. Nine tests between 1713 - 1876 m failed.
    The well was permanently abandoned on 9 July 1967 as an oil discovery, the first in Norway.
    Testing
    No drill stem test was performed.
  • Cuttings at the NPD

    Cuttings at the NPD
    Cuttings available for sampling?
    YES
    Cuttings at the NPD
    Cutting sample, top depth [m]
    Cutting samples, bottom depth [m]
    1213.00
    2270.00
  • Cores at the NPD

    Cores at the NPD
    Core sample number
    Core sample - top depth
    Core sample - bottom depth
    Core sample depth - uom
    1
    2
    0.0
    3
    3623.0
    3640.0
    [ft ]
    4
    5665.0
    5695.0
    [ft ]
    5
    5695.0
    5728.0
    [ft ]
    6
    5714.0
    5725.0
    [ft ]
    7
    6159.0
    6196.0
    [ft ]
    8
    6196.0
    6247.0
    [ft ]
    9
    6420.0
    6432.5
    [ft ]
    10
    6606.0
    6636.0
    [ft ]
    11
    7175.0
    7212.0
    [ft ]
    12
    7709.0
    7755.0
    [ft ]
    13
    7845.0
    7858.0
    [ft ]
    14
    8032.0
    8065.0
    [ft ]
    Cores at the NPD
    Total core sample length [m]
    105.6
    Cores at the NPD
    Cores available for sampling?
    YES
  • Palynological slides at the NPD

    Palynological slides at the NPD
    Sample depth
    Depth unit
    Sample type
    Laboratory
    0.0
    [m]
    DC
    0.0
    [m]
    C
    1721.0
    [m]
    DC
    1880.4
    [m]
    C
    1882.0
    [m]
    C
    1890.0
    [m]
    C
    3252.0
    [ft]
    C
    3280.0
    [ft]
    DC
    3370.0
    [ft]
    DC
    3490.0
    [ft]
    DC
    3520.0
    [ft]
    DC
    3600.0
    [ft]
    C
    3626.0
    [ft]
    C
    3633.5
    [ft]
    C
    3640.0
    [ft]
    C
    3700.0
    [ft]
    DC
    3700.0
    [ft]
    DC
    3800.0
    [ft]
    DC
    3900.0
    [ft]
    DC
    4000.0
    [ft]
    DC
    4000.0
    [ft]
    DC
    4080.0
    [ft]
    DC
    4100.0
    [ft]
    DC
    4170.0
    [ft]
    DC
    4190.0
    [ft]
    DC
    4230.0
    [ft]
    DC
    4280.0
    [ft]
    DC
    4360.0
    [ft]
    DC
    4380.0
    [ft]
    DC
    4405.0
    [ft]
    DC
    4430.0
    [ft]
    DC
    4460.0
    [ft]
    DC
    4490.0
    [ft]
    DC
    4520.0
    [ft]
    DC
    4580.0
    [ft]
    DC
    4610.0
    [ft]
    DC
    4670.0
    [ft]
    DC
    4700.0
    [ft]
    DC
    4790.0
    [ft]
    DC
    4790.0
    [ft]
    DC
    4880.0
    [ft]
    DC
    4880.0
    [ft]
    DC
    4970.0
    [ft]
    DC
    5000.0
    [ft]
    DC
    5090.0
    [ft]
    DC
    5180.0
    [ft]
    DC
    5210.0
    [ft]
    DC
    5290.0
    [ft]
    DC
    5300.0
    [ft]
    DC
    5390.0
    [ft]
    DC
    5500.0
    [ft]
    DC
    5540.0
    [ft]
    DC
    5560.0
    [ft]
    DC
    5569.0
    [ft]
    SWC
    5570.0
    [ft]
    SWC
    5580.0
    [ft]
    DC
    5600.0
    [ft]
    DC
    5640.0
    [ft]
    DC
    5665.0
    [ft]
    C
    5665.0
    [ft]
    DC
    5670.0
    [ft]
    C
    5675.0
    [ft]
    C
    5680.0
    [ft]
    C
    5688.0
    [ft]
    SWC
    5693.0
    [ft]
    SWC
    5695.0
    [ft]
    C
    5696.0
    [ft]
    C
    5714.0
    [ft]
    C
    5714.0
    [ft]
    C
    5722.0
    [ft]
    SWC
    5726.0
    [ft]
    SWC
    5728.0
    [ft]
    C
    5728.0
    [ft]
    DC
    5731.0
    [ft]
    SWC
    5736.0
    [ft]
    SWC
    5738.0
    [ft]
    SWC
    5800.0
    [ft]
    DC
    5815.0
    [ft]
    SWC
    5819.0
    [ft]
    SWC
    5825.0
    [ft]
    SWC
    5833.0
    [ft]
    SWC
    5840.0
    [ft]
    DC
    5900.0
    [ft]
    DC
    5960.0
    [ft]
    DC
    5980.0
    [ft]
    DC
    6000.0
    [ft]
    DC
    6020.0
    [ft]
    DC
    6080.0
    [ft]
    DC
    6100.0
    [ft]
    DC
    6140.0
    [ft]
    DC
    6157.0
    [ft]
    DC
    6158.0
    [ft]
    C
    6171.0
    [ft]
    C
    6171.0
    [ft]
    C
    6196.0
    [ft]
    C
    6198.0
    [ft]
    DC
    6201.0
    [ft]
    C
    6250.0
    [ft]
    DC
    6250.0
    [ft]
    DC
    6290.0
    [ft]
    DC
    6300.0
    [ft]
    DC
    6340.0
    [ft]
    DC
    6390.0
    [ft]
    DC
    6420.0
    [ft]
    C
    6421.0
    [ft]
    C
    6423.0
    [ft]
    C
    6427.0
    [ft]
    C
    6428.0
    [ft]
    C
    6431.0
    [ft]
    C
    6432.0
    [ft]
    C
    6445.0
    [ft]
    DC
    6500.0
    [ft]
    DC
    6540.0
    [ft]
    DC
    6550.0
    [ft]
    DC
    6550.0
    [ft]
    DC
    6600.0
    [ft]
    DC
    6610.0
    [ft]
    DC
    6615.0
    [ft]
    DC
    6620.0
    [ft]
    DC
    6650.0
    [ft]
    DC
    6710.0
    [ft]
    DC
    6740.0
    [ft]
    DC
    6750.0
    [ft]
    DC
    6800.0
    [ft]
    DC
    6850.0
    [ft]
    DC
    6900.0
    [ft]
    DC
    6927.0
    [ft]
    C
    6940.0
    [ft]
    DC
    7000.0
    [ft]
    DC
    7040.0
    [ft]
    DC
    7090.0
    [ft]
    DC
    7140.0
    [ft]
    DC
    7188.0
    [ft]
    C
    7203.0
    [ft]
    C
    7207.0
    [ft]
    C
    7211.0
    [ft]
    C
    7212.0
    [ft]
    DC
    7230.0
    [ft]
    DC
    7350.0
    [ft]
    DC
    7391.0
    [ft]
    C
    7395.0
    [ft]
    C
    7440.0
    [ft]
    DC
    7500.0
    [ft]
    DC
    7545.0
    [ft]
    DC
    7590.0
    [ft]
    DC
    7640.0
    [ft]
    DC
    7650.0
    [ft]
    SWC
    7655.0
    [ft]
    SWC
    7665.0
    [ft]
    SWC
    7665.0
    [ft]
    SWC
    7675.0
    [ft]
    SWC
    7742.0
    [ft]
    C
    7753.0
    [ft]
    C
    7755.0
    [ft]
    SWC
    7760.0
    [ft]
    SWC
    7765.0
    [ft]
    SWC
    7770.0
    [ft]
    SWC
    7780.0
    [ft]
    SWC
    7785.0
    [ft]
    SWC
    7795.0
    [ft]
    SWC
    7800.0
    [ft]
    SWC
    7800.0
    [ft]
    DC
    7810.0
    [ft]
    SWC
    7815.0
    [ft]
    SWC
    7820.0
    [ft]
    SWC
    7825.0
    [ft]
    SWC
    7830.0
    [ft]
    SWC
    7835.0
    [ft]
    SWC
    7840.0
    [ft]
    SWC
    7845.0
    [ft]
    C
    7900.0
    [ft]
    DC
    7922.0
    [ft]
    SWC
    7935.0
    [ft]
    SWC
    7940.0
    [ft]
    SWC
    7945.0
    [ft]
    SWC
    7985.0
    [ft]
    SWC
    8053.0
    [ft]
    C
  • Lithostratigraphy

  • Geochemical information

    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.07
    pdf
    0.71
    pdf
    1.15
    pdf
    0.32
    pdf
    0.12
  • 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
    3.68
  • Documents – NPD papers

  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CAL
    1232
    1718
    CDM
    1232
    2451
    FDC
    610
    2461
    IES
    362
    2462
    LL-7
    362
    2459
    MLL
    362
    2460
    SGR
    180
    2457
  • 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
    179.0
    36
    179.0
    0.00
    LOT
    SURF.COND.
    20
    363.0
    26
    363.0
    0.00
    LOT
    INTERM.
    13 3/8
    1233.0
    17 1/2
    1244.0
    0.00
    LOT
    OPEN HOLE
    2460.0
    12 1/4
    2460.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    369
    0.00
    seawater
    1213
    0.00
    waterbased
  • Thin sections at the NPD

    Thin sections at the NPD
    Depth
    Unit
    991.00
    [m ]
    1879.00
    [m ]
    1896.00
    [m ]
    1904.00
    [m ]
    1938.00
    [m ]
    1936.00
    [m ]
    6215.00
    [m ]
  • 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
    0.21