Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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21.11.2024 - 01:28
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2/4-16 R

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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.
    2/4-16 R
    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.
    JUNKED
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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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    2/4-16
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    BB-87-043A- SP.10870
    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.
    Saga Petroleum ASA
    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.
    680-L2
    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.
    42
    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,
    04.06.1992
    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.
    15.07.1992
    Plugged and abondon date
    Date when the P&A-operations of the wellbore was finished, as reported by the operator to the Norwegian Offshore Directorate throught DDRS (Daily Drilling Reporting System). Only applied once pr. wellhead/surface location.
    15.07.1992
    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.
    15.07.1994
    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.
    18.01.2007
    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.
    YES
    Reentry activity
    Reason for reentry of the wellbore. Only relevant for exploration wellbores. Example of legal values: DRILLING, DRILLING/PLUGGING, LOGGING, PLUGGING, TESTING, TESTING/PLUGGING.
    DRILLING/PLUGGING
    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.
    26.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    67.5
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4973.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    3.1
    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.
    MIDDLE JURASSIC
    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.
    BRYNE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    56° 40' 39.41'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 9' 2.9'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6281650.56
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    509240.64
    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.
    1956

  • Wellbore history
    General
    The licence area is located in a prolific area in the southern North Sea on the eastern margin of the Feda Graben. Well 2/4-16 was drilled on the eastern margin of the Feda Graben North of the Albuskjell and Ekofisk Fields in the North Sea. Geologically the area consists of three sub-platforms. These are separated by large NW-SE striking normal faults down-faulted to the southwest and stepping down to the Feda Graben in the southern part of the block. The 2/4-16 well is located in the centre of the licence area on the same down faulted segment as the blowout wells 2/4-13, -14 and -15. Well 2/4-16 was temporarily abandoned at 4996 m in the Middle Jurassic Bryne formation due to operational problems. The main objective of well 2/4-16 R was to penetrate the Middle Jurassic and through the Triassic sequence to test for possible hydrocarbon bearing sandstone sequences. The plan was to sidetrack just below the 7 5/8" casing shoe at 4892 m and if operation permitted, to penetrate the complete Triassic sequence and terminate the well in the Zechstein Group evaporites. Planned TD for the well was 5190 + 60 m. If no signs of salt/anhydrite, the maximum TD of the well should be 5250 m.
    Operations and results
    Well 2/4-16 was re-entered (2/4-16 R) with the semi-submersible installation Treasure Saga on 4 June 1992. The old hole was sidetracked between 4900 to 4930 m and drilled to 4973 m in the Middle Jurassic Bryne Formation where the well was terminated due to extremely high pore pressures in the range 2.16 - 2.17 EMW. One week was spent attempting to bleed off pressure with no success. Analysis of the bleed-off operation showed that it was impossible to reduce the high pore pressure. As the source of the extreme pore pressure is of unknown origin it was decided to stop further drilling and permanently abandon the well.
    No conventional logs for formation evaluation were run. No cores were cut and no wire line fluid samples taken.
    The well was permanently abandoned on 15 July 1992 as a dry well with shows.
    Testing
    No drill stem test was performed

  • 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
    11.10

  • 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
    LINER
    6
    4882.0
    7 5/8
    4973.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    110
    1.85
    21.0
    8.0
    WATER BASED
    15.07.1992
    110
    1.85
    21.0
    8.0
    WATER BASED
    15.07.1992
    110
    1.85
    21.0
    8.0
    WATER BASED
    16.07.1992
    4632
    2.18
    2728.0
    3.0
    WATER BASED
    07.07.1992
    4632
    2.18
    28.0
    3.0
    WATER BASED
    03.07.1992
    4632
    2.18
    28.0
    3.0
    WATER BASED
    07.07.1992
    4632
    2.18
    32.0
    7.0
    WATER BASED
    07.07.1992
    4632
    1.80
    21.0
    7.0
    WATER BASED
    08.07.1992
    4632
    1.80
    21.0
    7.0
    WATER BASED
    08.07.1992
    4632
    1.77
    21.0
    7.0
    WATER BASED
    10.07.1992
    4650
    1.85
    21.0
    4.0
    WATER BASED
    14.07.1992
    4650
    1.85
    20.0
    5.0
    WATER BASED
    14.07.1992
    4650
    1.85
    20.0
    5.0
    WATER BASED
    14.07.1992
    4903
    2.14
    33.0
    3.0
    WATER BASED
    16.06.1992
    4903
    2.14
    33.0
    3.0
    WATER BASED
    16.06.1992
    4915
    2.14
    32.0
    6.0
    WATER BASED
    16.06.1992
    4915
    2.14
    32.0
    6.0
    WATER BASED
    16.06.1992
    4927
    2.14
    28.0
    3.0
    WATER BASED
    16.06.1992
    4927
    2.14
    28.0
    3.0
    WATER BASED
    16.06.1992
    4930
    2.14
    26.0
    2.0
    WATER BASED
    18.06.1992
    4949
    2.14
    27.0
    4.0
    WATER BASED
    19.06.1992
    4954
    2.14
    26.0
    2.0
    WATER BASED
    19.06.1992
    4973
    2.14
    27.0
    2.0
    WATER BASED
    22.06.1992
    4973
    2.14
    27.0
    3.0
    WATER BASED
    22.06.1992
    4973
    2.14
    25.0
    4.0
    WATER BASED
    22.06.1992
    4973
    2.14
    29.0
    3.0
    WATER BASED
    23.06.1992
    4973
    2.14
    28.0
    4.0
    WATER BASED
    24.06.1992
    4973
    2.16
    32.0
    5.0
    WATER BASED
    26.06.1992
    4973
    2.20
    34.0
    6.0
    WATER BASED
    30.06.1992
    4973
    2.20
    34.0
    8.0
    WATER BASED
    30.06.1992
    4973
    2.20
    35.0
    8.0
    WATER BASED
    30.06.1992
    4973
    2.17
    35.0
    11.0
    WATER BASED
    30.06.1992
    4973
    2.20
    33.0
    6.0
    WATER BASED
    02.07.1992
    4973
    2.20
    33.0
    7.0
    WATER BASED
    02.07.1992
    4973
    2.19
    35.0
    12.0
    WATER BASED
    30.06.1992
    4973
    1.85
    22.0
    4.0
    WATER BASED
    13.07.1992