Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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19.06.2024 - 01:33
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25/8-19 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.
    25/8-19 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
    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
    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.
    25/8-19
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    PGS16M01-PGS15917VIK (IL 36471. XL 132652)
    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.
    MOL Norge 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.
    1795-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.
    59
    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,
    02.11.2019
    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.
    30.12.2019
    Plugged date
    Date when plugging operations was finished, as reported by the operator to the Norwegian Offshore Directorate through DDRS (Daily Drilling Reporting System).
    30.12.2019
    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.
    30.12.2021
    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.
    WILDCAT
    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.
    OIL/GAS
    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.
    EARLY JURASSIC
    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.
    EIRIKSSON 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 TRIASSIC
    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.
    SKAGERRAK FM
    3rd level with HC, age
    Age of lithostratigraphic unit, 3rd level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE.
    PALEOCENE
    3rd level with HC, formation
    Name of lithostartigraphic unit, 3rd 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.
    HEIMDAL FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    23.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    126.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2760.0
    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).
    2545.0
    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.
    BASEMENT
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 20' 13.21'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 21' 53.27'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6577903.13
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    463861.92
    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.
    8932
  • Wellbore history

    Operations and results
    A 9-7/8" shallow gas pilot hole was drilled to 1015 m in the Hordaland Group, just below the Skade Formation. No shallow gas was encountered.
    Wildcat well 25/8-19 S was spudded with the semi-submersible installation Deepsea Bergen on 2 November 2019 and drilled to TD at 2760 m (2545 m TVD) m in Basement rock. Operations proceeded mostly as planned, but while drilling the final 6" hole to final TD the top drive service loop was damaged by a fire. Waiting for new parts and repairs caused one week NPT. The well was drilled with seawater and hi-vis pills down to 1015 m and with RheGuard oil-based mud from 1015 m to TD.
    No injectite sandstone was encountered in the Eocene. Thin oil-bearing sandstone layers were found in the Paleocene Heimdal Formation, confirmed by MDT sampling. The Ty Formation massive sandstones were water-bearing, but sidewall cores indicated shows above OBM in the more porous intervals (5 - 12 % porosity). The Ty Formation sands rest unconformably on the Early Jurassic Amundsen Formation. The Amundsen Formation is a ca 20 m thick claystone unit separating the massive Ty sandstones from massive Upper Statfjord sandstones. The Upper and Middle Statfjord Group sandstones were water-bearing down to 2356 m, but good shows with bleeding oil was seen on the core from this section. Oil-bearing sandstones were encountered in the Lower Statfjord unit and pressure gradients indicated an OWC at 2386 m (2233.3 m TVD). Below this OWC an isolated pocket of oil was proven by sampling in a thin sand at 409.5 m. A 34-metre gas column in sandstone with moderate to good reservoir quality lies over an oil column of minimum 45 metres in sandstones in the Skagerrak Formation. The OWC was not encountered. Weathered and partly fractured crystalline basement is oil-bearing with a column a minimum of 41 metres.
    Four cores were cut. Core 1 was cut from 2252.6 to 2277.3 m in the Statfjord Group with 99.8% recovery. Cores 2, 3 and 4 were cut in succession from 2575 to 2662.2 m in the Skagerrak Formation with 99.7 to 101.2% recoveries. MDT fluid sample were taken at 2036.79 m (Oil), 2255 m (water), 2382.94 m (oil), 2385.4 m (water), 2409.5 m (oil), 2428.49 m (water), 2596.7 m (gas), 2598.75 m (oil), 2611.5 m (oil), 2688.02 m (oil), and 2735.02 m (oil). Contamination with mud filtrate in the samples varied from 3.6 to 36 %wt. The least contaminated oil samples are from 2036,79 m, 2382,94 m and 2611,5 m.
    The well was plugged back for side-tracking of 25/8-19 A on 30 December 2019. It is classified as an oil and gas discovery 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]
    1020.00
    2760.00
  • 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
    2252.6
    2277.3
    [m ]
    2
    2575.0
    2603.5
    [m ]
    3
    2603.5
    2632.9
    [m ]
    4
    2632.9
    2662.7
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    112.4
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Oil samples at the Norwegian Offshore Directorate

    Oil samples at the Norwegian Offshore Directorate
    Test type
    Bottle number
    Top depth
    MD [m]
    Bottom depth
    MD [m]
    Fluid type
    Test time
    Samples available
    MDT
    0.00
    0.00
    YES
    MDT
    2036.79
    0.00
    OIL
    30.11.2019 - 00:00
    YES
    MDT
    2382.94
    0.00
    OIL
    09.02.2020 - 00:00
    YES
    MDT
    2409.53
    0.00
    OIL
    05.12.2019 - 00:00
    YES
    MDT
    2611.50
    0.00
    OIL
    05.12.2019 - 00:00
    YES
    MDT
    2688.02
    0.00
    OIL
    23.12.2019 - 00:00
    YES
    MDT
    2735.02
    0.00
    OIL
    23.12.2019 - 00:00
    YES
  • Lithostratigraphy

  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    LWD - DIR PWD GR RES
    149
    1015
    LWD - DIR PWD GR RES SON
    149
    1015
    LWD - GR DIR PWD DEN NEU RES SON
    2675
    2760
    LWD - GR PWD DIR DEN NEU RES SON
    1015
    2675
    MDT
    2001
    2670
    MDT DPS
    2686
    2749
    MDT MINIDST
    2032
    2666
    MSCT
    2001
    2670
    MSCT
    2680
    2758
    NFXT CMR
    2001
    2670
    TLD HGNS
    2658
    2768
    TLD HGNS PPC MAST PPC
    2001
    2670
    UBI NGI
    2668
    2760
    USIT CBL
    1221
    1957
    XL ROCK
    2001
    270
    ZAIT MAST
    2653
    2769
    ZAIT NGI
    2001
    2670
  • 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
    215.0
    36
    215.0
    0.00
    SURF.COND.
    20
    1009.5
    26
    1009.5
    1.74
    FIT
    INTERM.
    9 5/8
    1914.4
    12 1/4
    1914.0
    1.93
    LOT
    LINER
    7
    2473.0
    8 1/2
    2473.0
    1.50
    FIT
    OPEN HOLE
    2545.0
    6
    2545.0
    0.00
  • Thin sections at the Norwegian Offshore Directorate

    Thin sections at the Norwegian Offshore Directorate
    Depth
    Unit
    2310.28
    [m ]
    3228.42
    [m ]
    2350.31
    [m ]
    2364.23
    [m ]
    2395.30
    [m ]
    2410.65
    [m ]
    2415.68
    [m ]
    2427.51
    [m ]
    2442.33
    [m ]
    2454.18
    [m ]
    2475.91
    [m ]
    2499.50
    [m ]
    2517.86
    [m ]
    2545.75
    [m ]
    2563.19
    [m ]
    2682.30
    [m ]
    2685.02
    [m ]
    2726.47
    [m ]
    2727.00
    [m ]
    2728.00
    [m ]
    2730.01
    [m ]
    2733.54
    [m ]
    2736.61
    [m ]
    2739.51
    [m ]
    2743.06
    [m ]
    2745.48
    [m ]
    2747.00
    [m ]
    2747.50
    [m ]
    2749.34
    [m ]
    2751.00
    [m ]
    2752.00
    [m ]
    2755.52
    [m ]
    2758.54
    [m ]
    2725.53
    [m ]
    2722.50
    [m ]
    2719.98
    [m ]
    2715.48
    [m ]
    2710.01
    [m ]
    2695.99
    [m ]
    2686.50
    [m ]
    2690.50
    [m ]
    2680.00
    [m ]
    2293.33
    [m ]
    2281.30
    [m ]
    2252.18
    [m ]
    2247.66
    [m ]
    2244.15
    [m ]
    2239.13
    [m ]
    2226.09
    [m ]
    2223.09
    [m ]
    2219.41
    [m ]
    2214.16
    [m ]
    2199.31
    [m ]
    2182.47
    [m ]
    2156.68
    [m ]
    2126.69
    [m ]
    2117.93
    [m ]
    2050.85
    [m ]
    2036.79
    [m ]
    2034.77
    [m ]
    2017.74
    [m ]
    2662.75
    [m ]
    2661.51
    [m ]
    2660.22
    [m ]
    2659.35
    [m ]
    2658.60
    [m ]
    2657.34
    [m ]
    2656.37
    [m ]
    2655.60
    [m ]
    2654.82
    [m ]
    2653.89
    [m ]
    2652.82
    [m ]
    2652.08
    [m ]
    2651.12
    [m ]
    2649.75
    [m ]
    2647.35
    [m ]
    2645.37
    [m ]
    2642.91
    [m ]
    2638.87
    [m ]
    2637.90
    [m ]
    2637.40
    [m ]
    2636.41
    [m ]
    2635.11
    [m ]
    2631.67
    [m ]
    2630.50
    [m ]
    2628.82
    [m ]
    2627.20
    [m ]
    2626.37
    [m ]
    2625.38
    [m ]
    2624.48
    [m ]
    2623.90
    [m ]
    2623.15
    [m ]
    2622.81
    [m ]
    2622.08
    [m ]
    2621.40
    [m ]
    2620.75
    [m ]
    2618.60
    [m ]
    2616.60
    [m ]
    2615.85
    [m ]
    2615.06
    [m ]
    2614.50
    [m ]
    2613.75
    [m ]
    2613.25
    [m ]
    2612.50
    [m ]
    2611.75
    [m ]
    2611.12
    [m ]
    2611.05
    [m ]
    2610.50
    [m ]
    2610.28
    [m ]
    2609.48
    [m ]
    2608.75
    [m ]
    2608.50
    [m ]
    2607.80
    [m ]
    2607.60
    [m ]
    2606.50
    [m ]
    2606.21
    [m ]
    2605.50
    [m ]
    2604.55
    [m ]
    2603.75
    [m ]
    2603.41
    [m ]
    2601.75
    [m ]
    2601.02
    [m ]
    2600.25
    [m ]
    2599.95
    [m ]
    2599.25
    [m ]
    2598.60
    [m ]
    2598.02
    [m ]
    2597.25
    [m ]
    2596.75
    [m ]
    2595.95
    [m ]
    2595.50
    [m ]
    1.00
    [m ]
    2594.95
    [m ]
    2594.75
    [m ]
    2593.50
    [m ]
    2592.50
    [m ]
    2591.51
    [m ]
    2588.77
    [m ]
    2587.02
    [m ]
    2586.02
    [m ]
    2585.02
    [m ]
    2584.95
    [m ]
    2583.25
    [m ]
    2582.50
    [m ]
    2581.95
    [m ]
    2580.02
    [m ]
    2579.50
    [m ]
    2579.02
    [m ]
    2578.45
    [m ]
    2577.53
    [m ]
    2576.73
    [m ]
    2576.02
    [m ]
    2575.03
    [m ]
    2276.24
    [m ]
    2275.40
    [m ]
    2274.49
    [m ]
    2272.20
    [m ]
    2271.50
    [m ]
    2271.02
    [m ]
    2270.51
    [m ]
    2269.50
    [m ]
    2268.25
    [m ]
    2267.28
    [m ]
    2266.75
    [m ]
    2260.02
    [m ]
    2265.02
    [m ]
    2264.62
    [m ]
    2264.25
    [m ]
    2263.50
    [m ]
    2262.02
    [m ]
    2261.50
    [m ]
    2260.40
    [m ]
    2259.50
    [m ]
    2257.25
    [m ]
    2255.03
    [m ]
    2254.03
    [m ]
    2252.85
    [m ]
    2252.62
    [m ]