Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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26.11.2024 - 01:27
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2/4-5

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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.
    2/4-5
    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
    Multilateral
    Indicator telling if the parent well is multilateral, meaning it has more than one branch radiating from the main borehole. Example of legal values: YES, NO. See also Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    NO
    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.
    2/4-5
    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.
    Phillips Petroleum Company Norway
    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.
    40-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.
    68
    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,
    21.06.1970
    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.
    27.08.1970
    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.
    27.08.1972
    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.
    02.04.2007
    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.
    APPRAISAL
    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 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
    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.
    PALEOCENE
    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.
    EKOFISK FM
    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.
    LATE CRETACEOUS
    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.
    TOR FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    24.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    68.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3320.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    3.5
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    132
    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.
    LATE CRETACEOUS
    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.
    TOR FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    56° 34' 27.24'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 12' 11.82'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6270151.28
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    512490.31
    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.
    177

  • Wellbore history
    General
    Well 2/4-5 (named 2/4-4X by operator Phillips) was drilled to appraise the northern segment of the 2/4-2 Ekofisk discovery. The Ekofisk discovery is located in the Central Trough in the southern Norwegian North Sea and its structure is an anticline, uplifted by halokinetic movements of Permian salt. The objective of well 2/4-4 was to test the Tertiary and the top of the Late Cretaceous. Planned total depth was 11000 ft (3352 m).
    The well is Type Well for the Ekofisk Formation.
    Operations and results
    Well 2/4-5 was spudded with the semi-submersible installation Neptune 7 on 21 June 1970 and drilled to TD at 3320 m in the Late Cretaceous Tor Formation. The well was drilled with seawater and hi-vis mud down to 585 m, with seawater/lignosulphonate mud from 585 to 3217 m, and with seawater/drill-aid mud from 3217 m to TD. Below 584 m 2 - 5 % diesel was added to the mud.
    The Danian Chalk (Ekofisk Formation) was encountered at 3037 m and the Maastrichtian chalk (Tor Formation) was encountered at 3164 m. Both formations were hydrocarbon bearing. A total of 86.2 m core was recovered in 12 cores in the interval 3094 to 3206 m in the Ekofisk and Tor Formations. No fluid samples were taken on wire line.
    The well was permanently abandoned on 27 August 1970 as an oil appraisal.
    Testing
    Five zones in the Ekofisk and Tor Formations were perforated for testing.
    DST 1 and DST 1A tested the intervals 3164 -3203 m and 3177 - 3186 m in the Tor Formation, respectively. DST 1 produced at maximum 165795 Sm3 gas and 701 Sm3 oil /day on a 24/64" choke. The GOR was 236 Sm3/Sm3; the oil gravity was 37.3 deg API. The reservoir temperature in the DST1 zone was reported to be 129.4 deg C. DST 1A was conducted with smaller choke sizes and gave somewhat lower rates than in DST 1, but fluid properties were similar.
    DST 2 tested the interval 3106 -3143 m in the Ekofisk Formation, but was discontinued for weather conditions. DST 2A tested the same interval and flowed 112020 Sm3 gas and 486 Sm3 oil of 37 deg API gravity through a 50/64" choke and, after acidization, 113410 Sm3 gas and 480 Sm3 oil of 37.1 deg API gravity through a 21/64" choke. The GOR before and after acidization was 231 and 236 Sm3/Sm3, respectively. The reservoir temperature in the DST 2A zone was reported to be 125.6 deg C.
    DST 3 should test the interval 3088 - 3094 m in the Ekofisk Formation, but was a failure.
    DST 4 tested the interval 3042 - 3075 m in the Ekofisk Formation. It flowed 18240 Sm3 gas and 58 Sm3 oil of 37.5 deg API gravity through a 24/64" choke. The GOR was 313 Sm3/Sm3. After acidization, it flowed 92115 Sm3 gas and 411 Sm3 oil of 37.3 deg API gravity with the same choke size. The GOR was 224 Sm3/Sm3. The reservoir temperature in the DST 4 zone was reported to be 125.6 deg C.

  • Cuttings at the Norwegian Offshore Directorate
    Cuttings at the Norwegian Offshore Directorate
    Cuttings available for sampling?
    NO
    Cuttings at the Norwegian Offshore Directorate
    Cutting sample, top depth [m]
    Cutting samples, bottom depth [m]
    591.31
    1536.19

  • 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
    10150.0
    10151.0
    [ft ]
    2
    10168.0
    10198.0
    [ft ]
    3
    10198.0
    10220.0
    [ft ]
    4
    10220.0
    10232.0
    [ft ]
    5
    10280.0
    10300.0
    [ft ]
    6
    10440.0
    10458.0
    [ft ]
    7
    10458.0
    10488.0
    [ft ]
    8
    10488.0
    10518.0
    [ft ]
    9
    10518.0
    10548.0
    [ft ]
    10
    10548.0
    10578.0
    [ft ]
    11
    10578.0
    10608.0
    [ft ]
    12
    10608.0
    10638.0
    [ft ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    86.3
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • 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
    130.0
    36
    130.0
    0.00
    LOT
    SURF.COND.
    20
    573.0
    26
    585.0
    0.00
    LOT
    INTERM.
    13 3/8
    1639.0
    17 1/2
    1646.0
    0.00
    LOT
    INTERM.
    9 5/8
    3029.0
    12 1/4
    3056.0
    0.00
    LOT
    LINER
    7
    3321.0
    8 1/2
    3321.0
    0.00
    LOT

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    3165
    3204
    9.5
    2.0
    3178
    3187
    5.6
    3.0
    3107
    3143
    19.8
    4.0
    3087
    3098
    25.4
    5.0
    3041
    3075
    9.5
    6.0
    3043
    3076
    0.0
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    29.000
    22.000
    42.000
    2.0
    32.000
    23.000
    44.000
    3.0
    29.000
    6.000
    20.000
    4.0
    5.0
    25.000
    16.000
    34.000
    6.0
    Drill stem tests (DST)
    Test number
    Oil
    [Sm3/day]
    Gas
    [Sm3/day]
    Oil density
    [g/cm3]
    Gas grav. rel.air
    GOR
    [m3/m3]
    1.0
    701
    165696
    0.838
    0.896
    2.0
    433
    94918
    0.842
    3.0
    483
    111785
    0.840
    4.0
    5.0
    411
    92060
    0.838
    6.0

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL
    2964
    3260
    CCL
    2952
    3309
    CDM
    3034
    3323
    DIR
    1639
    3046
    FDC
    3030
    3323
    GR
    91
    569
    IES
    561
    3321
    MLL-C
    3030
    3323
    SGR
    569
    1639
    SGR-C
    1639
    3320
    SNP
    1639
    3323
    VELOCITY
    595
    3319
    AA
    3030
    3320

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    91
    1716
    2905
    2905
    2914
    2950
    3024
    3037
    3037
    3164

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.47

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.53

  • 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
    20.47
    pdf
    0.57
    pdf
    5.43
    pdf
    4.44
    pdf
    24.04
    pdf
    10.56
    pdf
    20.47
    pdf
    10.98
    pdf
    12.23
    pdf
    4.41
    pdf
    2.71
    pdf
    7.23
    pdf
    3.75
    pdf
    13.15
    pdf
    7.94
    pdf
    1.71
    pdf
    7.17
    pdf
    5.41
    pdf
    1.00
    pdf
    3.05
    pdf
    10.95
    pdf
    0.69
    pdf
    0.99

  • Documents – Norwegian Offshore Directorate papers
    Documents – Norwegian Offshore Directorate papers
    Document name
    Document format
    Document size [MB]
    pdf
    18.62
    pdf
    1.95
    pdf
    1.18

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    130
    1.05
    seawa/slugs
    960
    1.68
    seawa/slugs
    1646
    1.72
    seawa/ligno
    2225
    1.71
    seawa/ligno
    3056
    1.72
    seawa/ligno
    3320
    1.71
    seawa/ligno

  • Thin sections at the Norwegian Offshore Directorate
    Thin sections at the Norwegian Offshore Directorate
    Depth
    Unit
    10220.00
    [ft ]
    10220.00
    [ft ]
    10455.00
    [ft ]
    10474.00
    [ft ]
    10497.00
    [ft ]
    10191.00
    [ft ]
    10283.00
    [ft ]
    10612.00
    [ft ]
    10625.00
    [ft ]