Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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22.12.2024 - 01:25
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2/11-6 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.
    2/11-6 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).
    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.
    SUSPENDED
    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
    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.
    2/11-6
    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.
    Amoco Norway Oil Company
    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.
    305-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.
    177
    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,
    02.09.1981
    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.
    25.02.1982
    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.
    25.02.1984
    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.
    22.03.2013
    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.
    LATE CRETACEOUS
    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.
    TOR 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.
    HOD FM
    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.
    72.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4076.0
    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).
    2957.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    57
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    111
    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.
    EARLY 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.
    HOD FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    56° 10' 35.5'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 27' 36.72'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6225960.07
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    528571.99
    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.
    289

  • Wellbore history
    General
    Well 2/11-6 S was drilled on the Lindesnes Ridge in the southern North Sea. The objective was to appraise the Hod discovery made by well 2/11-2 in 1974 (Hod West) and appraisal well 2/11-3 in 1977 (Hod East). The Hod structure is oil-bearing in Late Cretaceous chalks, the Hod and Tor formations. Well 2/11-6 S targeted the Hod East structure.
    Operations and results
    Appraisal well 2/11-6 S was the first well to be drilled on a subsea template which was laid by the semi-submersible installation Sedco 703. It was then drilled with Sedco 703 through slot number W7 of the twelve slot templates, to TD at 3970 m (2905 m TVD) where the pipe got stuck. The pipe was shot off with top of the fish at 3669 m and a technical sidetrack 2/11-6 ST1 was kicked off from 3626 m. The sidetrack was drilled to the final TD at 4076 m (2980 m TVD). The initial well bore was drilled with seawater and hi-vis sweeps down to 1460 m, with Vertoil oil based mud from 1460 m to 3601 m, and with Oilfaze oil based mud from 3601 m to 3970 m. The 2/11-6 ST1 sidetrack was drilled with Vertoil oil based mud from kick-off to TD.
    Well 2/11-6 drilled a nearly complete Tertiary section and penetrated top chalk at 3690 m (2732 m TVD). The sidetrack penetrated top of the chalk group at 3685 m (2729 m) with a slightly lower angle (50 deg) than in the initial well bore (55 deg). The chalk stratigraphy in the two well bores was very similar apart from the angle/depth shift. The well tested oil in the Tor / upper Hod formations and in the lower Hod Formation.
    Seven conventional cores were cut from 3693 to 3741 m in the initial well bore before side tracking. The cores were cut in the Late Cretaceous Chalk. The total recovery was 34 m (71%). Due to the fish left in the hole no logs were run below 3790 m in the initial well bore. Logs were run to TD in the sidetrack, including the RFT tool, but no fluid samples were taken.
    The well was suspended on 25 February 1982 as an oil appraisal well.
    Testing
    Two Drill Stem Tests were performed.
    DST 1 tested the interval 3875 - 3900 m (2851.7 - 2867.8 m TVD) in the Hod Formation. It produced 39650 Sm3 gas and 355 Sm3 oil /day through a 24/64" choke. The GOR was 108 Sm3/Sm3.
    DST 2 tested the interval 3685 - 3735 m (2729.7 - 2761.8 m TVD) in the Tor Formation and the upper part of the Hod Formation. It produced 93450 Sm3 gas and 922 Sm3 oil /day through a 48/64" choke. The GOR was 101 Sm3/Sm3, the oil density was 0.871 g/cm3, and the gas gravity was 0.71 (air = 1). The down hole temperature, measured at 3609 m, was 104.4 deg C.

  • 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]
    180.00
    3970.00

  • 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
    3693.1
    3712.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    19.0
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3693-3696m
    Core photo at depth: 3696-3703m
    Core photo at depth: 3703-3709m
    Core photo at depth: 3709-3711m
    Core photo at depth: 3711-3717m
    3693-3696m
    3696-3703m
    3703-3709m
    3709-3711m
    3711-3717m
    Core photo at depth: 3717-3720m
    Core photo at depth: 3720-3723m
    Core photo at depth: 3723-3727m
    Core photo at depth: 3727-3734m
    Core photo at depth: 3734-3736m
    3717-3720m
    3720-3723m
    3723-3727m
    3727-3734m
    3734-3736m
    Core photo at depth: 3736-3739m
    Core photo at depth: 3739-3740m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3736-3739m
    3739-3740m

  • 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
    167.0
    36
    167.0
    0.00
    LOT
    SURF.COND.
    20
    353.0
    26
    358.0
    1.38
    LOT
    INTERM.
    13 3/8
    1453.0
    17 1/2
    1461.0
    1.90
    LOT
    INTERM.
    9 5/8
    3593.0
    12 1/4
    3601.0
    1.97
    LOT
    LINER
    7
    4072.0
    8 1/2
    4076.0
    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
    3875
    3900
    3.2
    2.0
    3585
    3706
    7.9
    3.0
    3713
    3735
    19.0
    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
    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
    364
    39000
    105
    2.0
    223
    24000
    0.863
    0.714
    106
    3.0
    921
    87000
    95

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL CCL GR
    3386
    4038
    DIL LDL NGT
    3589
    4976
    HDT
    3589
    4079
    HRT
    3440
    4028
    LDL CNL GR
    3589
    4080
    RFT GR
    3589
    3952
    VELOCITY
    352
    4076

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    98
    1792
    3564
    3564
    3690
    3690
    3716

  • 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
    130
    1.03
    waterbased
    1125
    1.07
    waterbased
    1325
    1.11
    34.0
    waterbased
    1475
    1.53
    53.0
    waterbased
    1565
    1.54
    70.0
    waterbased
    1850
    1.56
    68.0
    waterbased
    2260
    1.74
    70.0
    waterbased
    3900
    1.88
    94.0
    waterbased
    3920
    1.81
    90.0
    waterbased

  • Thin sections at the Norwegian Offshore Directorate
    Thin sections at the Norwegian Offshore Directorate
    Depth
    Unit
    3721.36
    [m ]
    3722.50
    [m ]
    3718.20
    [m ]
    3720.00
    [m ]