Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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22.11.2024 - 09:09
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2/4-11

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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.
    2/4-11
    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
    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
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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
    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.
    2/4-11
    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.
    103-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.
    106
    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,
    25.12.1973
    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.
    09.04.1974
    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.
    09.04.1976
    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.
    WILDCAT
    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.
    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.
    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
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    35.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    66.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4281.0
    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 PERMIAN
    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.
    ZECHSTEIN GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    56° 44' 45.9'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 13' 21.8'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6289284.20
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    513622.57
    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.
    255

  • Wellbore history
    General
    Wildcat well 2/4-11 should evaluate the southern part of a northwest-southeast trending seismic high about 3.2 km long and 2.4 km wide. The well was drilled just south of the boundary between blocks 2/1 and 2/4 about two km southeast of the 2/1-1 well. The objective formations were the Danian-Late Cretaceous limestone in addition to sandstones of the Jurassic, which had gas and condensate shows in the 2/1-1 well. Top Paleocene was anticipated at 2972 m (9750 ft), top Danian at 3078 m (10100 ft), top Late Cretaceous at 3277 m (10750 ft), and top Jurassic at 3962 m (13000 ft). Planned TD was at 4267 m (14000 ft).
    Operations and results
    Well 2/4-11 was spudded with the jack-up installation Zapata Explorer on 25 December 1973 and drilled to TD at 4281 m in the Late Permian Zechstein Group. Running 7" casing at 3838 m, the casing could not get passed 3019 m. Pulling out of hole the casing stuck when 20 stands were left. Eleven days were spent working on the fish before it came loose. The hole was reamed and casing was set. Maximum hole deviation down to a depth of 2757 m was 4.75 deg, at 149 m. The well was drilled with spud mud (Seawater gel and Flosal) down to 321 m, with Shale Trol mud from 321 m to 2265 m, and with a Lignosulphonate mud (Unical and Ligcon) from 2265 m to TD. Below 792 m one to four percent diesel was added to the mud.
    Top Paleocene was found at 2936 m, top Danian limestone at 3146 m, top Late Cretaceous limestone at 3268 m, top Early Cretaceous was found at 3782 m, top Late Jurassic (Kimmeridgian) at 3968 m, and top of the Permian was encountered at 4211 m. Sub-commercial amounts of oil was tested from the Danian and even smaller amounts from the Late Cretaceous. The Jurassic section penetrated consisted of shale, claystone, and siltstone and contained no reservoir rocks.
    Source rock analyses of sidewall cores from the Jurassic showed TOC in the range 0.6 - 2% and vitrinite reflection from 0.78 to 0.80 %Ro. Relatively low hydrogen indices indicate that the source rock has reached past mid oil window and that a major part of the hydrocarbon potential had been realised.
    No conventional cores were cut and no wire line fluid samples taken.
    The well was permanently abandoned on 9 April 1974 as an oil discovery.
    Testing
    Five DST's were carried out: DST 1, 2 and 3 in the Late Cretaceous limestone, DST 4 and 5 in the Danian limestone. All results given here are after acidization:
    DST 1 from the interval 3758 to 3770 m flowed slowly and sluggishly. Two hours after acidization the well started to flow water, gas, mud and trace of crude oil, but due to observed mud loss in the casing the well was killed.
    DST 2 from the interval 3639 to 3667 m was a misrun. DST 3 from the same interval flowed slowly and irregularly 5 - 8 Sm3 oil and some gas.
    DST 4 from 3188 -3200 m flowed only water cushion to surface, at a very poor rate.
    DST 5 from 3146 - 3161 m in the topmost Danian limestone flowed 50 Sm3 oil, 2 m3 water, and 1051 Sm3 gas /day on a 64/64" choke. Oil gravity was 39.9 deg API and the GOR was 21 Sm3/Sm3. The down hole temperature measured in the test was reported to be 124 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]
    1228.34
    4279.40

  • 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
    131.0
    36
    131.0
    0.00
    LOT
    SURF.COND.
    20
    487.0
    26
    487.0
    0.00
    LOT
    INTERM.
    13 3/8
    1219.0
    17 1/2
    1219.0
    0.00
    LOT
    INTERM.
    9 5/8
    2743.0
    12 1/4
    2743.0
    0.00
    LOT
    LINER
    7
    3962.0
    8
    3962.0
    0.00
    LOT
    LINER
    5
    4281.0
    6
    4281.0
    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
    3758
    3770
    0.0
    2.0
    3639
    3667
    0.0
    3.0
    3639
    3667
    0.0
    4.0
    3188
    3200
    0.0
    5.0
    3146
    3161
    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
    2.0
    3.0
    4.0
    5.0
    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
    2.0
    3.0
    8
    4.0
    5.0
    50
    1050
    0.822

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    BHC
    1224
    2763
    BHC
    3813
    4270
    BHC-C
    2755
    3837
    CAL BG
    1226
    2765
    CBL CCL
    2743
    3813
    CDM
    2755
    3838
    CDM AP
    2755
    3838
    CDM PP
    2755
    3838
    DLL
    2756
    3835
    FDC
    2755
    3838
    IES
    1224
    4212
    PML
    2755
    3838
    SNP
    2972
    3838
    VELOCITY
    1224
    4270

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.85
    pdf
    0.41
    pdf
    1.60

  • Documents – reported by the production licence (period for duty of secrecy expired)

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    137
    1.07
    seawater
    487
    1.31
    seawater
    1219
    1.31
    seawater
    2438
    1.64
    seawa/barit
    3962
    1.71
    seawa/barit

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    3901.0
    [m]
    DC
    OD
    3911.0
    [m]
    DC
    OD
    3920.0
    [m]
    DC
    OD
    3929.0
    [m]
    DC
    OD
    3938.0
    [m]
    DC
    OD
    3947.0
    [m]
    DC
    OD
    3956.0
    [m]
    DC
    OD
    3965.0
    [m]
    DC
    OD
    3975.0
    [m]
    DC
    OD
    3984.0
    [m]
    DC
    OD
    3993.0
    [m]
    DC
    OD
    4002.0
    [m]
    DC
    OD
    4011.0
    [m]
    DC
    OD
    4020.0
    [m]
    DC
    OD
    4029.0
    [m]
    DC
    OD
    4039.0
    [m]
    DC
    OD
    4048.0
    [m]
    DC
    OD
    4057.0
    [m]
    DC
    OD
    4066.0
    [m]
    DC
    OD
    4075.0
    [m]
    DC
    OD
    4084.0
    [m]
    DC
    OD
    4093.0
    [m]
    DC
    OD
    4103.0
    [m]
    DC
    OD
    4112.0
    [m]
    DC
    OD
    4121.0
    [m]
    DC
    OD
    4130.0
    [m]
    DC
    OD
    4139.0
    [m]
    DC
    OD
    4148.0
    [m]
    DC
    OD
    4157.0
    [m]
    DC
    OD
    4167.0
    [m]
    DC
    OD
    4176.0
    [m]
    DC
    OD
    4185.0
    [m]
    DC
    OD
    4194.0
    [m]
    DC
    OD
    4194.0
    [m]
    DC
    OD
    4203.0
    [m]
    DC
    OD
    4212.0
    [m]
    DC
    OD
    4221.0
    [m]
    DC
    OD
    4231.0
    [m]
    DC
    OD
    4240.0
    [m]
    DC
    OD
    4249.0
    [m]
    DC
    OD
    4258.0
    [m]
    DC
    OD
    4267.0
    [m]
    DC
    OD
    4276.0
    [m]
    DC
    OD
    4279.0
    [m]
    DC
    OD