Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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25/2-10 S

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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.
    25/2-10 S
    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.
    SUSPENDED
    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.
    25/2-10
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    EL 8504 - 330 SP. 304
    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.
    494-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.
    108
    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,
    02.12.1985
    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.
    19.03.1986
    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.
    19.03.1988
    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.
    17.12.2003
    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/GAS
    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.
    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 Norwegian Offshore Directorate bulletins.
    EARLY MIOCENE
    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 Norwegian Offshore Directorate bulletins.
    NO FORMAL NAME
    2nd level with HC, age
    Age of lithostratigraphic unit, 2nd level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE.
    EOCENE
    2nd level with HC, formation
    Name of lithostartigraphic unit, 2nd 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.
    FRIGG FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    21.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    120.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2967.0
    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).
    2643.0
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    75
    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° 53' 11.8'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 30' 8.33'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6639043.07
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    472144.07
    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.
    855

  • Wellbore history
    General
    Well 25/2-10 S was designed to drill the Gamma Structure, one of the Frigg satellites, east of the East Frigg Beta Structure. The primary objective of the well was to test whether the gamma structure is an eastward extension of the East Frigg Beta structure. The main target was the Lower Eocene Frigg Formation; secondary targets were the Balder and Ekofisk Formations. In addition a possible gas accumulation was expected in a thin sand body of late Oligocene age.
    Shallow gas indications at 256 m MSL, and a disturbed zone on the seismic from seabed to the Frigg Formation demanded a deviated well in order to reach the Frigg Formation at its highest structural position.
    Operations and results
    Wildcat well 25/2-10 S was spudded 2 December 1985 by Sonat Offshore A/S semi-submersible rig Henry Goodrich. The well terminated in Limestone of the Early Paleocene Ekofisk Formation at a depth of 2967 m (2643 m TVD RKB).
    Due to shallow gas indication on the chosen locality, the well was spudded 1100 m north and 200 m east of the TD position. Drilling proceeded without significant problems down to 1049 m here mud was lost.
    An Oligocene sand, now re-dataed to be of Lower Miocene age, was confirmed in the interval 1115 m to 1148.5 m (1006.5 m to 1031 m TVD RKB) with gas from top sand at 1115 m down to a GOW at 1136.5 m (1006.5 m to 1022.5 m TVD RKB). From 1095 m to 1150 m (992 m to 1030 m TVD RKB) strong yellowish green to yellow ocher direct fluorescence and milky yellow cut were observed on cuttings and SWC. Pressure measurements suggest an oil gradient of ca 0.72 g/cc below the gas with a tentative OWC at 1162 m (1041.5 m TVD RKB). Top Frigg Formation came in at 2230 m (1943 m TVD RKB) with minor amounts of oil and gas. The GOC in the Frigg reservoir was found at 2243.6 m (1956 m TVD RKB) and the OWC at 2259.6 m (1971 m TVD RKB). Brown oil staining was reported on the cores from 2243.5 m to 2257 m. In the Frigg Formation, direct fluorescence shows were reported from 2230 m to 2280 m. No fluorescence was observed below 2280 m. The average reservoir temperatures were estimated to 30.6deg C in the Lower Miocene reservoir and 58.0deg C in the Frigg reservoir.
    Five cores were cut in the interval 2236 m to 2275 m. Two cores were cut down to 2311 m, and altogether 9 cores were cut in this well. Wire line RFT samples were taken in Lower Miocene at 1129 m (gas) and in the Frigg Formation at 2234.6 m (gas and mud filtrate), and at 2252.5 m (oil and mud filtrate). Testing of the two hydrocarbon bearing zones was not carried out as the NPD consent for use of the rig was withdrawn. During abandonment operation the BOP was lost 8 m above wellhead and caused severe damage such that the well was lost. The well was suspended 19 March 1986 as an oil and gas discovery.
    The well was re-entered (25/2-10 SR) with the semi-submersible installation Nortrym on 16 September 1987. The only operations performed in the re-entry were plugging and permanent abandonment. The well was completed 22 September 1987 as an oil and gas discovery.
    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]
    210.00
    2967.00

  • 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
    2237.0
    2245.0
    [m ]
    3
    2246.0
    2246.9
    [m ]
    4
    2247.6
    2256.8
    [m ]
    5
    2257.0
    2269.2
    [m ]
    8
    2582.0
    2597.0
    [m ]
    9
    2888.0
    2892.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    49.3
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 2237-2241m
    Core photo at depth: 2242-2244m
    Core photo at depth: 2246-2247m
    Core photo at depth: 2247-2252m
    Core photo at depth: 2252-2257m
    2237-2241m
    2242-2244m
    2246-2247m
    2247-2252m
    2252-2257m
    Core photo at depth: 2257-2260m
    Core photo at depth: 2261-2264m
    Core photo at depth: 2265-2269m
    Core photo at depth: 2582-2586m
    Core photo at depth: 2587-2592m
    2257-2260m
    2261-2264m
    2265-2269m
    2582-2586m
    2587-2592m
    Core photo at depth: 2592-2596m
    Core photo at depth: 2888-2892m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    2592-2596m
    2888-2892m

  • Oil samples at the Norwegian Offshore Directorate
    Oil samples at the Norwegian Offshore Directorate
    Test type
    Bottle number
    Top depth
    MD [m]
    Bottom depth
    MD [m]
    Fluid type
    Test time
    Samples available
    RFT
    RFT-5
    2252.00
    0.00
    14.02.1986 - 00:00
    YES

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.58

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.76
    pdf
    0.40

  • 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
    5.94

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    BGT
    945
    1428
    BHC GR
    947
    1143
    CBL VDL CCL GR
    1950
    2034
    CBL VDL GR
    140
    1830
    CST GR
    848
    2034
    DIL LSS GR
    202
    2642
    DLL MSFL GR
    948
    2126
    LDT CNL
    947
    2642
    LDT GR
    202
    956
    MWD
    220
    2967
    NGT
    947
    2642
    SHDT GR
    1837
    2640

  • 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
    202.0
    36
    202.0
    0.00
    LOT
    INTERM.
    20
    616.0
    26
    626.0
    0.00
    LOT
    INTERM.
    13 3/8
    1032.0
    17 1/2
    1045.0
    0.00
    LOT
    INTERM.
    9 5/8
    2115.0
    12 1/4
    2129.0
    0.00
    LOT
    LINER
    7
    2967.0
    8 1/2
    2967.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    166
    1.07
    35.0
    65.0
    WATER BASED
    04.12.1985
    202
    1.07
    35.0
    65.0
    WATER BASED
    05.12.1985
    220
    1.05
    15.0
    10.0
    WATER BASED
    10.12.1985
    428
    1.08
    15.0
    5.0
    WATER BASED
    10.12.1985
    456
    1.07
    10.0
    20.0
    WATER BASED
    10.12.1985
    626
    1.07
    20.0
    29.0
    WATER BASED
    10.12.1985
    626
    1.08
    20.0
    14.0
    WATER BASED
    10.12.1985
    626
    1.15
    20.0
    14.0
    WATER BASED
    11.12.1985
    626
    1.15
    20.0
    14.0
    WATER BASED
    12.12.1985
    626
    1.15
    20.0
    WATER BASED
    16.12.1985
    626
    1.04
    WATER BASED
    17.12.1985
    626
    1.04
    WATER BASED
    18.12.1985
    626
    1.07
    20.0
    13.0
    WATER BASED
    23.12.1985
    626
    1.08
    28.0
    20.0
    WATER BASED
    10.12.1985
    631
    1.06
    20.0
    13.0
    WATER BASED
    23.12.1985
    817
    1.08
    29.0
    17.0
    WATER BASED
    23.12.1985
    956
    1.09
    15.0
    23.0
    WATER BASED
    23.12.1985
    1037
    1.07
    12.0
    25.0
    WATER BASED
    24.12.1985
    1045
    1.07
    24.0
    17.0
    WATER BASED
    24.12.1985
    1045
    1.07
    22.0
    12.0
    WATER BASED
    24.12.1985
    1045
    1.06
    20.0
    20.0
    WATER BASED
    24.12.1985
    1045
    1.06
    17.0
    8.0
    WATER BASED
    30.12.1985
    1045
    1.12
    22.0
    11.0
    WATER BASED
    30.12.1985
    1045
    1.07
    16.0
    15.0
    WATER BASED
    30.12.1985
    1049
    1.12
    16.0
    13.5
    WATER BASED
    30.12.1985
    1049
    1.12
    16.0
    27.0
    WATER BASED
    30.12.1985
    1049
    1.12
    160.0
    270.0
    WATER BASED
    30.12.1985
    1075
    1.13
    30.0
    11.0
    WATER BASED
    01.01.1986
    1100
    1.13
    29.0
    10.0
    WATER BASED
    02.01.1986
    1100
    1.12
    29.0
    10.0
    WATER BASED
    06.01.1986
    1100
    1.13
    29.0
    10.0
    WATER BASED
    01.01.1986
    1348
    1.14
    34.0
    13.0
    WATER BASED
    06.01.1986
    1459
    1.15
    30.0
    9.0
    WATER BASED
    06.01.1986
    1546
    1.16
    36.0
    12.0
    WATER BASED
    07.01.1986
    1717
    1.17
    34.0
    13.0
    WATER BASED
    03.01.1986
    1791
    1.18
    30.0
    10.0
    WATER BASED
    09.01.1986
    1866
    1.17
    32.0
    12.0
    WATER BASED
    13.01.1986
    1866
    1.18
    35.0
    13.0
    WATER BASED
    13.01.1986
    2015
    1.20
    38.0
    16.0
    WATER BASED
    13.01.1986
    2129
    1.24
    40.0
    14.0
    WATER BASED
    16.01.1986
    2129
    1.26
    40.0
    14.0
    WATER BASED
    17.01.1986
    2129
    1.24
    43.0
    14.0
    WATER BASED
    14.01.1986
    2129
    1.26
    40.0
    14.0
    WATER BASED
    20.01.1986
    2129
    1.26
    40.0
    15.0
    WATER BASED
    20.01.1986
    2133
    1.07
    28.0
    5.0
    WATER BASED
    23.01.1986
    2233
    1.09
    26.0
    8.0
    WATER BASED
    25.01.1986
    2236
    1.09
    26.0
    10.0
    WATER BASED
    25.01.1986
    2246
    1.09
    25.0
    5.0
    WATER BASED
    25.01.1986
    2248
    1.10
    25.0
    5.0
    WATER BASED
    25.01.1986
    2257
    1.12
    26.0
    5.0
    WATER BASED
    25.01.1986
    2311
    1.11
    24.0
    5.0
    WATER BASED
    30.01.1986
    2371
    1.11
    26.0
    7.5
    WATER BASED
    31.01.1986
    2371
    1.11
    26.0
    2.5
    WATER BASED
    03.02.1986
    2427
    1.12
    31.0
    6.5
    WATER BASED
    03.02.1986
    2555
    1.12
    27.0
    8.0
    WATER BASED
    03.02.1986
    2582
    1.12
    28.0
    9.0
    WATER BASED
    01.02.1986
    2600
    1.12
    32.0
    10.0
    WATER BASED
    04.02.1986
    2748
    1.11
    29.0
    9.0
    WATER BASED
    06.02.1986
    2856
    1.12
    28.0
    10.7
    WATER BASED
    11.02.1986
    2885
    1.12
    30.0
    8.8
    WATER BASED
    11.02.1986
    2925
    1.13
    29.0
    8.8
    WATER BASED
    11.02.1986
    2955
    1.11
    28.0
    9.8
    WATER BASED
    11.02.1986
    2967
    1.11
    30.0
    9.8
    WATER BASED
    11.02.1986

  • 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
    0.23