Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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23.11.2024 - 01:30
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25/1-10

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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.
    25/1-10
    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.
    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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    25/1-10
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    EL 8501 X 376 SP. 380
    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.
    Elf Petroleum Norge AS
    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.
    570-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.
    149
    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,
    19.04.1988
    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.
    14.09.1988
    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.
    14.09.1990
    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.
    06.01.2015
    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.
    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.
    27.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    99.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4739.0
    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).
    4732.6
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    149
    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.
    BRENT GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 57' 8.58'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 5' 48.11'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6646607.84
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    449542.00
    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.
    1219

  • Wellbore history
    General
    Well 25/1-10 was drilled on the northern part of the Frigg Field in the Viking Graben. The primary objective was to test the Mesozoic "Deep Frigg" structure below the Frigg Field. The structure is a narrow north-south trending rotated mesozoic fault block. The first well drilled on the structure, 25/1-1, penetrated the top of Middle Jurassic sandstones at more than 4500 m, but was abandoned due to water flow associated with high pressure. The second well, 30/10-5, encountered both Middle Jurassic Brent Group sandstones and Lower Jurassic Statfjord Group sandstones, but the sandstones were water bearing. Well 25/1-10 was designed to test the remaining up dip potential of the Brent and Statfjord reservoirs. Secondary objectives were to establish the sweeping status of the Lower Eocene Frigg Formation and to obtain additional petrophysical data from this reservoir.
    Operations and results
    Wildcat well 25/1-10 was spudded with the semi-submersible installation Vinni on 19 April 1988 and drilled to TD at 3739 m in the Middle Jurassic Brent Group. The interval 287-923 m was drilled with a 14 3/4" pilot hole to check for shallow gas. No gas was detected during drilling. The main problems during operations were encountered with the shales above the Frigg Formation and subsequent mud losses into the Frigg Formation. Further hole problems and mud losses occurred in the Brent Group, related to high pressures and fragile formation.
    Top of Frigg was found at 1926 m. The electrical wireline logs clearly showed that formation water has swept the gas that was initially present in the Frigg reservoir sands. Quantitative analysis indicate average porosities of 29 - 30 % and a residual gas saturation of 19 %. The well penetrated the Brent Group at 4771 m. Brent was found water bearing with an average porosity of 18 % and a Net/Gross ratio of 0.54. The average water saturation is 95 %. FMT pressure measurements showed a formation pressure of 926.8 bar at 4503 m. This is severe overpressure. For well safety reasons, the Statfjord formation was not drilled.
    Hydrocarbon indications were scarce except for generally high background gas readings from 3600 m within the Shetland Group and down to TD. Minor oil shows were recorded from 1955 m to 1980 m in the Frigg Formation and from 2863 m to 2870 m in the Shetland Group.
    One core was cut from 4473 m to 4483 m with 16% recovery. No wire line fluid samples were taken.
    The well was permanently abandoned on 14 September 1988 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]
    935.00
    4740.00

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    126
    730
    1926
    2171
    2171
    2291
    2423
    2662
    4060
    4259
    4259
    4312
    4471

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.56
    pdf
    0.72

  • 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
    10.14
    pdf
    10.25

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL GR
    1450
    2825
    CBL VDL GR
    2750
    4451
    CDL CN GR
    1900
    4745
    DIFL LSS GR
    190
    4575
    DIP GR
    3200
    4058
    DIP GR
    4457
    4720
    FMT HP
    3618
    3700
    FMT HP
    4503
    4685
    PDK 100 GR CCL
    1910
    2010
    SWC GR
    4475
    4590
    VSP
    909
    4745

  • 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
    188.0
    36
    188.0
    0.00
    LOT
    SURF.COND.
    20
    910.0
    26
    923.0
    1.17
    LOT
    INTERM.
    13 3/8
    2825.0
    17 1/2
    2839.0
    1.72
    LOT
    INTERM.
    9 5/8
    4043.0
    12 1/4
    4058.0
    2.15
    LOT
    LINER
    7
    4451.0
    8 1/2
    4471.0
    2.25
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    985
    1.08
    25.0
    8.3
    WATER BASED
    03.05.1988
    1588
    1.14
    27.0
    8.8
    WATER BASED
    05.05.1988
    1635
    1.16
    21.0
    6.8
    WATER BASED
    06.05.1988
    1780
    1.17
    181.0
    83.7
    WATER BASED
    09.05.1988
    1939
    1.20
    22.0
    7.8
    WATER BASED
    09.05.1988
    2062
    1.20
    46.0
    10.7
    WATER BASED
    18.05.1988
    2233
    1.21
    39.0
    16.6
    WATER BASED
    24.05.1988
    2233
    1.21
    39.0
    16.1
    WATER BASED
    25.05.1988
    2419
    1.21
    40.0
    16.6
    WATER BASED
    26.05.1988
    2485
    1.21
    40.0
    16.6
    WATER BASED
    27.05.1988
    2622
    1.21
    39.0
    16.6
    WATER BASED
    30.05.1988
    2671
    1.22
    36.0
    15.1
    WATER BASED
    31.05.1988
    2693
    1.21
    36.0
    17.6
    WATER BASED
    02.06.1988
    2726
    1.21
    38.0
    17.6
    WATER BASED
    02.06.1988
    2741
    1.21
    38.0
    17.6
    WATER BASED
    03.06.1988
    2787
    1.21
    35.0
    17.6
    WATER BASED
    06.06.1988
    2833
    1.21
    33.0
    17.6
    WATER BASED
    06.06.1988
    2839
    1.22
    38.0
    16.6
    WATER BASED
    06.06.1988
    2844
    1.22
    24.0
    6.8
    WATER BASED
    13.06.1988
    2941
    1.25
    32.0
    8.8
    WATER BASED
    13.06.1988
    2951
    1.25
    26.0
    8.8
    WATER BASED
    13.06.1988
    3037
    1.27
    32.0
    8.8
    WATER BASED
    14.06.1988
    3051
    1.27
    37.0
    10.7
    WATER BASED
    15.06.1988
    3140
    1.27
    32.0
    9.8
    WATER BASED
    16.06.1988
    3230
    1.27
    27.0
    10.2
    WATER BASED
    17.06.1988
    3340
    1.27
    28.0
    10.2
    WATER BASED
    20.06.1988
    3384
    1.27
    27.0
    9.3
    WATER BASED
    20.06.1988
    3474
    1.32
    26.0
    8.8
    WATER BASED
    20.06.1988
    3555
    1.35
    29.0
    8.8
    WATER BASED
    21.06.1988
    3569
    1.42
    33.0
    10.7
    WATER BASED
    22.06.1988
    3635
    1.42
    33.0
    10.7
    WATER BASED
    23.06.1988
    3706
    1.58
    34.0
    14.2
    WATER BASED
    28.06.1988
    3777
    1.65
    32.0
    9.3
    WATER BASED
    28.06.1988
    3846
    1.65
    37.0
    12.2
    WATER BASED
    28.06.1988
    3953
    1.68
    38.0
    12.7
    WATER BASED
    28.06.1988
    4058
    1.74
    40.0
    10.7
    WATER BASED
    01.07.1988
    4159
    1.80
    42.0
    8.8
    WATER BASED
    19.07.1988
    4470
    2.05
    51.0
    14.7
    WATER BASED
    27.07.1988
    4497
    2.15
    43.0
    5.3
    WATER BASED
    22.08.1988
    4574
    2.15
    45.0
    5.8
    WATER BASED
    22.08.1988
    4593
    2.15
    45.0
    5.3
    WATER BASED
    23.08.1988
    4627
    2.15
    45.0
    5.8
    WATER BASED
    24.08.1988
    4676
    2.15
    44.0
    6.3
    WATER BASED
    25.08.1988
    4708
    2.15
    44.0
    5.8
    WATER BASED
    26.08.1988
    4739
    2.15
    46.0
    7.3
    WATER BASED
    29.08.1988

  • 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