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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2/8-17 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.
    2/8-17 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.
    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.
    2/8-17
    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.
    912-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.
    45
    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,
    04.12.1997
    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.
    17.01.1998
    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.
    17.01.2000
    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.
    24.09.2003
    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.
    OIL SHOWS
    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.
    41.7
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    68.7
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2685.0
    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).
    2641.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    25.8
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    117
    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° 27' 21.19'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 36' 5.18'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6257121.59
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    537069.24
    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.
    3210

  • Wellbore history
    General
    The purpose of the 2/8-17 S well was to evaluate the Trud prospect, a salt induced anticline on the western edge of the Piggvar Terrace 20 km Northeast of the Valhall Field. The primary objectives of the well were the Late Cretaceous Ekofisk and Tor chalk Formations, which form the main reservoirs in the nearby Ekofisk and Valhall Fields. The well was planned to TD in Permian evaporites immediately underlying the chalk.
    Operations
    Exploration well 2/8-17 S was spudded with the jack-up installation "Transocean Nordic" on 4 December 1997 and drilled to 2685 m. At this point total loss of circulation occurred and the well bore collapsed below 9 5/8" casing at 2000 m. All attempts to change the mud weight only made hole conditions worse and the decision was eventually made to plug back and sidetrack. The well was drilled with seawater and gel sweeps down to 1100 m and with "ANCOVERT" oil based mud from 1100 m to TD.
    The 2/8-17 S well penetrated the Ekofisk and Tor Formations. The last cuttings before the hole was lost contained significant amounts of anhydrite, strongly suggesting that the Permian Zechstein salt had been penetrated at TD. The loss of the hole prevented wire line logging and fluid sampling and a full evaluation of the Ekofisk and Tor Formations, however 4 cores were successfully cut and recovered over most of the interval. In addition, good quality GR and resistivity LWD logs was obtained from the chalk section. The chalk was tighter than anticipated.
    Minor oil shows were recorded from dolomite and dolomitic limestone stringers between 2060 m and 2290 m, and between 2375 m and 2510 m; these produced a milky white streaming cut and bluish white crush cut, with a faint residue. Dark brown - black dead oil staining was observed on some dolomite cuttings.
    Oil shows were recorded in the uppermost Ekofisk Formation during drilling before core l; producing a milky or bluish white cut fluorescence in up to 20 % of the cuttings. No shows were observed in core 1, however subsequent cores were found to contain bituminous dead oil residues in tight, partially calcite-infilled fractures. Typical patchy dull pale yellow to bluish white fluorescence was observed from some exposed fracture surfaces, cut was slow, bluish or milky white, streaming or blooming. Although live oil was not recorded at the well site, a slow bleed of very pale yellow brown oil was observed from fractures in the slabbed core. There was no evidence that hydrocarbons had penetrated the matrix, which was of low permeability and porosity.
    Well 2/8-17 S was plugged back to 1701 m and permanently abandoned on 17 January 1998 as a well with oil 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]
    310.00
    2681.00

  • 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
    2587.0
    2604.6
    [m ]
    2
    2605.0
    2623.9
    [m ]
    3
    2624.0
    2651.8
    [m ]
    4
    2651.8
    2674.3
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    86.8
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 2587-2592m
    Core photo at depth: 2592-2597m
    Core photo at depth: 2597-2602m
    Core photo at depth: 2602-2604m
    Core photo at depth: 2605-2610m
    2587-2592m
    2592-2597m
    2597-2602m
    2602-2604m
    2605-2610m
    Core photo at depth: 2610-2615m
    Core photo at depth: 2615-2620m
    Core photo at depth: 2620-2624m
    Core photo at depth: 2624-2629m
    Core photo at depth: 2629-2634m
    2610-2615m
    2615-2620m
    2620-2624m
    2624-2629m
    2629-2634m
    Core photo at depth: 2634-2639m
    Core photo at depth: 2639-2644m
    Core photo at depth: 2644-2649m
    Core photo at depth: 2649-2652m
    Core photo at depth: 2652-2656m
    2634-2639m
    2639-2644m
    2644-2649m
    2649-2652m
    2652-2656m
    Core photo at depth: 2656-2661m
    Core photo at depth: 2661-2666m
    Core photo at depth: 2666-2671m
    Core photo at depth: 2671-2674m
    Core photo at depth:  
    2656-2661m
    2661-2666m
    2666-2671m
    2671-2674m

  • 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
    299.0
    36
    300.0
    0.00
    LOT
    SURF.COND.
    13 3/8
    959.0
    17 1/2
    960.0
    0.00
    LOT
    INTERM.
    9 5/8
    2000.0
    12 1/4
    2000.0
    0.00
    LOT
    OPEN HOLE
    2685.0
    8 1/2
    2685.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    MWD MPR - GR RES DIR
    110
    2685

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    110
    1627
    2541
    2541
    2561
    2571
    2581
    2581
    2602

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.22

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.98

  • 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
    2.32
    pdf
    94.39

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    817
    0.00
    21.0
    SPUD MUD
    997
    0.00
    21.0
    SPUD MUD
    1700
    1.67
    23.0
    ANCO VERT
    1750
    1.87
    36.0
    ANCO VERT
    1800
    1.87
    36.0
    ANCO VERT
    1923
    0.00
    21.0
    SPUD MUD
    2251
    0.00
    7.0
    SPUD MUD
    2685
    1.91
    43.0
    ANCO VERT
    2685
    1.88
    43.0
    ANCO VERT