Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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3/4-1

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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.
    3/4-1
    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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    3/4-1
    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.
    781-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.
    47
    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,
    11.01.1994
    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.
    26.02.1994
    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.
    26.02.1996
    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.
    31.10.2003
    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
    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.
    43.9
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    48.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3107.0
    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).
    3107.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    1.3
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    107
    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° 40' 53.56'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    4° 15' 39.09'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6282788.24
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    577248.85
    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.
    2222

  • Wellbore history
    General
    Well 3/4-1 was the first well drilled in block 3/4 and was designed to penetrate and evaluate all potential hydrocarbon bearing formations above the Permian Zechstein Salt. The trap that was evaluated is a four way structural closure defined at Base Cretaceous level, formed by salt induced basin inversion, producing the present anticlinal configuration. The structure was identified using 2D seismic data in 1992, but, at that time, the structural configuration of the prospect and the composition of the clastic package could not be defined. Further geophysical, geological and geochemical studies were undertaken to better define the structure and Well 3/4-1 was drilled to help define the nature of the clastic package found in this part of block 3/4.
    The primary reservoir objective was the Upper Jurassic, shallow marine sandstone deposits contained in the hanging wall clastic package of the Coffee Soil Fault. Middle Jurassic sandstones were regarded as secondary objectives.
    Operations and results
    Exploration well 3/4-1 was spudded with the jack-up installation Maersk Gallant on 11 January 1994 and drilled to TD at 3107 m, 18 m into the Permian Zechstein Salt Group. The well was drilled with seawater and bentonite sweeps down to 506 m and with "ANCO 2000" (ca 3% "ANCO 208" glycol additive) from 506 m to TD.
    The top of the Hordaland at 1103 m and top of the Rogaland at 2317 m were 17 m shallow and 16 m deep respectively, in relationship to prognosed tops. The top of the Chalk (Shetland Group) 2415 m was 10 m shallower than prognosed, and was 252.5 m thick, 52.5 m thicker than prognosed. No hydrocarbon bearing intervals were found in the Chalk section as had been anticipated. A total of 295 m of Jurassic section was penetrated, versus a prognosed 450m, with 184m of reservoir quality sandstones (versus a prognosed 80m). The Upper Jurassic Ula Sandstone was 184 m thick, 104 m thicker than prognosed, and was dominantly clean sand. There were no free oil shows in the Jurassic section; however, the lower 20 m of the Ula Sandstone contained some bitumen. The Triassic Smith Bank Formation, not prognosed, was penetrated at 3013 m. The top of the Permian (Zechstein) at 3077 m was 58 m shallower than prognosed.
    An 18 m core was cut from 2740 m to 2758 m in the Ula Formation Sand. A FMT sample was taken at 2758.5 m. It recovered 9.4 litres (upper chamber) and 4.1 litres (lower chamber) of formation water. Analyses on the water from the lower chamber, carried out by Geco-Prakla in Stavanger, gave results that closely matched those found at the rig site, but Geco-Prakla also found 29.2 mg/1 of nitrates. Its presence, plus an ionic imbalance and the presence of potassium and sulphate, indicated that this chamber contained formation water mixed with a little mud filtrate.
    The well was permanently abandoned on 26 February 1994 as a dry hole with only rare bitumen shows.
    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]
    200.00
    3105.00

  • 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
    2740.0
    2758.1
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    18.1
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 2740-2744m
    Core photo at depth: 2744-2748m
    Core photo at depth: 2748-2752m
    Core photo at depth: 2752-2756m
    Core photo at depth: 2756-2758m
    2740-2744m
    2744-2748m
    2748-2752m
    2752-2756m
    2756-2758m

  • 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
    183.0
    36
    186.0
    0.00
    LOT
    SURF.COND.
    20
    502.0
    26
    506.0
    0.00
    LOT
    INTERM.
    13 3/8
    1509.0
    17 1/2
    1515.0
    0.00
    LOT
    OPEN HOLE
    3107.0
    12 1/4
    3107.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    COREGUN
    2718
    3048
    DIFL DGR
    2340
    2964
    DLL GR
    500
    1507
    DLL MLL DAC DGR
    1507
    3095
    DLL ZDEN GR
    500
    1507
    FMT PRETEST
    2738
    2908
    FMT SAMPLE
    2758
    2758
    HEXDIP
    1507
    3100
    MWD - DIR
    506
    3090
    MWD - GR RES
    92
    506
    VSP
    500
    3090
    ZDEN CN GR
    1507
    3095

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.46

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.75
    pdf
    0.66

  • 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
    131.22

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    254
    1.08
    5.0
    WATER BASED
    375
    1.07
    5.0
    WATER BASED
    506
    1.14
    7.0
    WATER BASED
    1008
    1.37
    18.0
    WATER BASED
    1250
    1.38
    20.0
    WATER BASED
    1515
    1.40
    25.0
    WATER BASED
    2297
    1.49
    24.0
    WATER BASED
    2683
    1.50
    24.0
    WATER BASED
    2724
    1.50
    23.0
    WATER BASED
    2758
    1.50
    17.0
    WATER BASED
    2776
    1.51
    29.0
    WATER BASED
    3007
    1.50
    22.0
    WATER BASED
    3107
    1.50
    22.0
    WATER BASED