Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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09.12.2024 - 01:26
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35/11-23 A

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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.
    35/11-23 A
    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
    Press release
    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.
    35/11-23
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    Inline: 2236. Xline: 6293. 3-D survey ST13M03
    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.
    Equinor Energy AS
    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.
    4918-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.
    15
    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,
    07.11.2019
    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.
    21.11.2019
    Plugged and abondon date
    Date when the P&A-operations of the wellbore was finished, as reported by the operator to the Norwegian Offshore Directorate throught DDRS (Daily Drilling Reporting System). Only applied once pr. wellhead/surface location.
    21.11.2019
    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.
    21.11.2021
    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.
    22.12.2021
    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
    Reentry
    Status whether the wellbore has been re-entered (YES) or not (NO). Re-entered wellbores are not included in the count when wellbores are presented in statistical overviews.
    NO
    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.
    30.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    350.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2883.0
    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).
    2659.0
    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.
    JURASSIC
    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.
    VIKING GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    61° 1' 14.7'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 27' 49.21'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6765347.72
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    525062.70
    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.
    8940
  • Wellbore history

    General
    Well 35/11-23 A is a geological side-track to the 35/11-23 Echino discovery on the Lomre Terrace north of the Troll Field in the North Sea. Well 35/11-23 discovered oil and gas in the Late Jurassic Sognefjord Formation and the Middle Jurassic Brent Group. The 35/11-23 A side-track was drilled down flanks to the west of the main bore on the Echino structure and the objective was to establish the OWC within the Sognefjord J56 reservoir.
    Operations and results
    Appraisal well 35/11-23 A was kicked off from the main bore at 1130 m on 7 November 2019. It was drilled with the semi-submersible installation Deepsea Atlantic to TD at 2883 m in the Middle Jurassic Heather Formation. Operations proceeded without significant problems. The well was drilled with Synteq oil-based mud from kick-off to TD.
    The J56 and J52 Sognefjord Formation sands that were found hydrocarbon bearing in the main bore, were penetrated from 2551 to 2605 m (2344 to 2395 m TVD) and from 2634 to 2673 m (2422 to 2460 m TVD), respectively. Both had good reservoir properties and were water bearing. Combined pressure data from the main bore and the side-track proved an OWC in the J56 sand at 2544 m (2337 m TVD). Pressure data also showed 3 bar lower pressure in J56 than in J52. The Krossfjord Formation from 2798 to 2808 m (2578 to 2588 m TVD) had a thin sand with high resistivity and shows described with direct and cut fluorescence. These are the only shows described in the well.
    No conventional cores were cut, but sidewall cores were taken. RCX water samples were taken at 2552.2 m .
    The well was permanently abandoned on 21 November 2019 as a dry appraisal well.
    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]
    1140.00
    2883.00
  • Palynological slides at the Norwegian Offshore Directorate

    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2500.0
    [m]
    DC
    PETROSTR
    2512.0
    [m]
    DC
    PETROS
    2524.0
    [m]
    DC
    PETROS
    2536.0
    [m]
    DC
    PETROS
    2548.0
    [m]
    DC
    PETROS
    2551.0
    [m]
    DC
    PETROS
    2554.0
    [m]
    DC
    PETROS
    2557.0
    [m]
    DC
    PETROS
    2557.0
    [m]
    DC
    PETROS
    2563.0
    [m]
    DC
    PETROS
    2572.0
    [m]
    DC
    PETROS
    2578.0
    [m]
    DC
    PETROS
    2584.0
    [m]
    DC
    PETROS
    2590.0
    [m]
    DC
    PETROS
    2596.0
    [m]
    DC
    PETROS
    2602.0
    [m]
    DC
    PETROS
    2608.0
    [m]
    DC
    PETROS
    2614.0
    [m]
    DC
    PETROS
    2620.0
    [m]
    DC
    PETROS
    2626.0
    [m]
    DC
    PETROS
    2632.0
    [m]
    DC
    PETROS
    2638.0
    [m]
    DC
    PETROS
    2644.0
    [m]
    DC
    PETROS
    2650.0
    [m]
    DC
    PETROS
    2656.0
    [m]
    DC
    PETROS
    2662.0
    [m]
    DC
    PETROS
    2668.0
    [m]
    DC
    PETROS
    2674.0
    [m]
    DC
    PETROS
    2680.0
    [m]
    DC
    PETROS
    2686.0
    [m]
    DC
    PETROS
    2692.0
    [m]
    DC
    PETROS
    2698.0
    [m]
    DC
    PETROS
    2704.0
    [m]
    DC
    PETROS
    2710.0
    [m]
    DC
    PETROS
    2716.0
    [m]
    DC
    PETROS
    2722.0
    [m]
    DC
    PETROS
    2728.0
    [m]
    DC
    PETROS
    2734.0
    [m]
    DC
    PETROS
    2743.0
    [m]
    DC
    PETROS
    2752.0
    [m]
    DC
    PETROS
    2758.0
    [m]
    DC
    PETROS
    2764.0
    [m]
    DC
    PETROS
    2770.0
    [m]
    DC
    PETROS
    2776.0
    [m]
    DC
    PETROS
    2782.0
    [m]
    DC
    PETROS
    2788.0
    [m]
    DC
    PETROS
    2794.0
    [m]
    DC
    PETROS
    2800.0
    [m]
    DC
    PETROS
    2803.0
    [m]
    DC
    PETROS
    2806.0
    [m]
    DC
    PETROS
    2809.0
    [m]
    DC
    PETROS
    2812.0
    [m]
    DC
    PETROS
    2818.0
    [m]
    DC
    PETROS
    2824.0
    [m]
    DC
    PETROS
    2830.0
    [m]
    DC
    PETROS
    2836.0
    [m]
    DC
    PETROS
    2842.0
    [m]
    DC
    PETROS
    2848.0
    [m]
    DC
    PETROS
    2854.0
    [m]
    DC
    PETROS
    2860.0
    [m]
    DC
    PETROS
    2866.0
    [m]
    DC
    PETROS
    2875.0
    [m]
    DC
    PETROS
    2881.0
    [m]
    DC
    PETROS
    2883.0
    [m]
    DC
    PETROS
  • Lithostratigraphy

  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    LWD - GR RES
    1126
    2348
    LWD - GR RES
    2348
    2883
  • 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
    SURF.COND.
    13 3/8
    1117.0
    17 1/2
    1117.0
    1.51
    FIT
    LINER
    9 5/8
    2150.3
    12 1/4
    2150.3
    1.40
    FIT
    OPEN HOLE
    2659.0
    8 1/2
    2659.0
    0.00