Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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26.12.2024 - 01:26
Time of last synchronization with Norwegian Offshore Directorate's internal systems

25/11-3

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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.
    25/11-3
    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
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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
    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.
    25/11-3
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    line SC 71 & sp 7375
    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.
    48-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.
    20
    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,
    25.09.1970
    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.
    14.10.1970
    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.
    14.10.1972
    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.
    30.04.2010
    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.
    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.
    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.
    10.0
    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).
    1858.0
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    63
    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° 10' 33.89'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 26' 15.39'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6559946.05
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    467853.06
    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.
    185

  • Wellbore history
    General
    Well 25/11-3 was drilled ca 1.5 km south of the 25/11-1 Balder discovery well on the Utsira High in the North Sea. The objective was to test the reservoir continuity, sand correlation and possible thickening of the 25/11-1 Early Eocene oil sands in a South-easterly direction.
    Operations and results
    Appraisal well 25/11-3 was spudded with the vessel Glomar Grand Isle on 25 September 1970 and drilled to TD at 1858 m in the Early Paleocene Ekofisk Formation. North Sea fall storms were the cause of drilling problems experienced on this well. Cumulative lost time due to waiting-on-weather alone amounted to 23.3% of the total rig days. While at the depth of 1228 m, one of the severe storms necessitated pulling the bit into the 9-5/8 inch casing and hanging off the drill pipe. After the storm abated and the hang off tool recovered, it was found that the 5 inch drill pipe extension below the tool had parted, allowing the drill string to fall to bottom. Fortunately the fish was recovered in one run with an overshot. The hole was then drilled to TD with no further problems. Initial drilling from the seafloor to 396 m was with sea water and gel. Below 396 to a depth of 960 m, the mud system consisted of seawater, Spersene XP-20 Salinex. From 960 m to TD fresh water Spersene XP-20 mud was used.
    The well penetrated the Utsira Formation and several Skade Formation sand units and then entered a ca 600 m thick section of shales belonging to the lower Hordaland Group before top Balder formation was encountered at 1711 m. Only thin Paleocene sands were encountered, and all were water wet without shows.
    No conventional cores were cut in the well. Four FIT fluid samplings were attempted in the Paleocene, but due to seal failure and tight formation no formation fluids were recovered, only mud.
    The well was permanently abandoned on 14 October 1970 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]
    402.34
    1837.94

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1560.0
    [m]
    DC
    RRI
    1600.0
    [m]
    DC
    RRI
    1620.0
    [m]
    DC
    RRI
    1630.0
    [m]
    DC
    RRI
    1650.0
    [m]
    DC
    RRI
    1680.0
    [m]
    DC
    RRI
    1689.0
    [m]
    DC
    RRI
    1704.0
    [m]
    DC
    RRI
    1719.0
    [m]
    DC
    RRI
    1749.0
    [m]
    DC
    RRI
    1755.0
    [m]
    DC
    RRI
    1761.0
    [m]
    DC
    RRI
    1770.0
    [m]
    DC
    RRI
    1791.0
    [m]
    DC
    RRI
    1810.0
    [m]
    DC
    RRI
    4380.0
    [ft]
    DC
    4500.0
    [ft]
    DC
    4680.0
    [ft]
    DC
    4800.0
    [ft]
    DC
    4890.0
    [ft]
    DC
    4980.0
    [ft]
    DC
    5100.0
    [ft]
    DC
    5190.0
    [ft]
    DC
    5280.0
    [ft]
    DC
    5400.0
    [ft]
    DC
    5490.0
    [ft]
    DC
    5525.0
    [ft]
    SWC
    5570.0
    [ft]
    SWC
    5580.0
    [ft]
    DC
    5590.0
    [ft]
    SWC
    5600.0
    [ft]
    SWC
    5620.0
    [ft]
    SWC
    5630.0
    [ft]
    SWC
    5650.0
    [ft]
    SWC
    5670.0
    [ft]
    SWC
    5670.0
    [ft]
    DC
    5697.0
    [ft]
    SWC
    5700.0
    [ft]
    DC
    5700.0
    [ft]
    DC
    5708.0
    [ft]
    SWC
    5712.0
    [ft]
    SWC
    5722.0
    [ft]
    SWC
    5724.0
    [ft]
    SWC
    5730.0
    [ft]
    SWC
    5730.0
    [ft]
    DC
    5760.0
    [ft]
    DC
    5770.0
    [ft]
    SWC
    5790.0
    [ft]
    DC
    5820.0
    [ft]
    SWC
    5820.0
    [ft]
    DC
    5820.0
    [ft]
    DC
    5840.0
    [ft]
    SWC
    5848.0
    [ft]
    SWC
    5850.0
    [ft]
    DC
    5852.0
    [ft]
    SWC
    5860.0
    [ft]
    SWC
    5870.0
    [ft]
    SWC
    5880.0
    [ft]
    DC
    5890.0
    [ft]
    SWC
    5900.0
    [ft]
    SWC
    5915.0
    [ft]
    SWC
    5945.0
    [ft]
    SWC
    5963.0
    [ft]
    SWC
    5971.0
    [ft]
    SWC
    5973.0
    [ft]
    SWC
    5976.0
    [ft]
    SWC
    5980.0
    [ft]
    SWC
    5990.0
    [ft]
    SWC
    6000.0
    [ft]
    DC
    6053.0
    [ft]
    SWC
    6082.0
    [ft]
    SWC
    6095.0
    [ft]
    SWC

  • 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
    1.05
    pdf
    3.19

  • Documents – Norwegian Offshore Directorate papers

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    BHC SON GR
    948
    1854
    FDC
    948
    1857
    GR
    140
    948
    IEL
    949
    1857

  • 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
    161.0
    36
    169.0
    0.00
    LOT
    SURF.COND.
    13 3/8
    389.0
    17 1/2
    389.0
    0.00
    LOT
    INTERM.
    9 5/8
    948.0
    12 1/4
    960.0
    0.00
    LOT
    OPEN HOLE
    1856.0
    8 1/2
    1856.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    396
    0.00
    seawater/ge
    960
    0.00
    seawater/sp
    1856
    0.00
    water/spers