Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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16.07.2024 - 01:28
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25/8-18 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.
    25/8-18 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.
    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.
    25/8-18
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    NH9301R07 inline 1118 & crossline 738
    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.
    Statoil Petroleum 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.
    1503-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.
    24
    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,
    29.09.2014
    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.
    23.10.2014
    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.
    23.10.2016
    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.
    23.10.2016
    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.
    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.
    PALEOCENE
    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.
    HEIMDAL FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    23.5
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    129.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    1890.0
    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).
    1884.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    11
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    74
    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.
    59° 15' 1.15'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 37' 0.57'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6568140.53
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    478144.69
    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.
    7388
  • Wellbore history

    General
    Well 25/8-18 S was drilled to appraise the 25/8-4 Hedila discovery on the Utsira High, east of the Ringhorne and Grane Fields in the North Sea. The primary objective was to test the Hydrocarbon potential in Lower Heimdal sands. Secondary objective was to test the upper Heimdal Formation, in a structurally high location.
    Operations and results
    Appraisal well 25/8-18 S was spudded with the semi-submersible installation Transocean Leader on 29 September 2014  and drilled to TD at 1890 m in the Late Cretaceous Tor Formation. The well was drilled as a J shape well, consisting of three hole sections: 36", 17 1/2" and 12 1/4". To reach the target location, the well was drilled with an inclination of up to 11 deg in the 12 1/4 section. There were no indication of shallow gas in the well. No significant problem was encountered in the operations. The well was drilled with seawater/spud mud down to 1165 m and with XP-07 oil based mud from 1165 m to TD.
    The well encountered a 25 m oil column in sandstones with good reservoir properties from top Lower Heimdal Formation at 1759.0 m (1755.5 m TVD) and down to the OWC at 1785 m (1780.5 m TVD). In addition, several thin hydrocarbon-filled stringers, interpreted as Upper Heimdal injectites, were found within the Lista Formation.  The pressure points indicate a continuous oil gradient through the upper and lower sands, inferring vertical communication between the Upper- and Lower Heimdal Formation. Additionally, the well found a gas-filled sand stringer at 1704 to 1707 m within the Balder Formation. Hydrocarbon shows were seen only inn association with the hydrocarbon-filled intervals.
    Two 27 m cores were cut from 1737.5 to 1792 m in the Heimdal Formation, covering the thinner injectite sandstones of the Upper Heimdal Formation, and the transition into the thick sandstone unit of the Lower Heimdal Formation. The last 5.6 m of the first core was lost, due to a failure of the full closure catcher system. Sampling and pressure points were sampled on wireline in the interval from 1706 to 1796 m. Oil was samples at 1760 m in the Heimdal Formation, and gas was sampled in the Balder Formation at 1706.1 m. The samples contained less than 1% mud contamination. Geochemical analyses of the Balder sample showed a biodegraded gas with characteristic heavy carbon-13 isotopes in propane. The Heimdal oil sample is indicated to be a mix of earlier biodegraded oil and fresh, non-degraded oil.
    The well was permanently abandoned on 23 October as an oil and gas 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]
    1170.00
    1890.00
  • 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
    1737.5
    1758.9
    [m ]
    2
    1765.0
    1792.1
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    48.5
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Palynological slides at the Norwegian Offshore Directorate

    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1170.0
    [m]
    DC
    ROBERTSO
    1200.0
    [m]
    DC
    ROBERT
    1220.0
    [m]
    DC
    ROBERT
    1230.0
    [m]
    DC
    ROBERT
    1260.0
    [m]
    DC
    ROBERT
    1290.0
    [m]
    DC
    ROBERT
    1320.0
    [m]
    DC
    ROBERT
    1350.0
    [m]
    DC
    ROBERT
    1380.0
    [m]
    DC
    ROBERT
    1410.0
    [m]
    DC
    ROBERT
    1440.0
    [m]
    DC
    ROBERT
    1470.0
    [m]
    DC
    ROBERT
    1500.0
    [m]
    DC
    ROBERT
    1530.0
    [m]
    DC
    ROBERT
    1560.0
    [m]
    DC
    ROBERT
    1590.0
    [m]
    DC
    ROBERT
    1620.0
    [m]
    DC
    ROBERT
    1650.0
    [m]
    DC
    ROBERT
    1660.0
    [m]
    DC
    ROBERT
    1670.0
    [m]
    DC
    ROBERT
    1680.0
    [m]
    DC
    ROBERT
    1692.0
    [m]
    DC
    ROBERT
    1698.0
    [m]
    DC
    ROBERT
    1704.0
    [m]
    DC
    ROBERT
    1710.0
    [m]
    DC
    ROBERT
    1719.0
    [m]
    DC
    ROBERT
    1728.0
    [m]
    DC
    ROBERT
    1734.0
    [m]
    DC
    ROBERT
    1737.5
    [m]
    C
    ROBERT
    1741.0
    [m]
    C
    ROBERT
    1743.0
    [m]
    C
    ROBERT
    1744.0
    [m]
    C
    ROBERT
    1745.0
    [m]
    C
    ROBERT
    1749.0
    [m]
    DC
    ROBERT
    1749.4
    [m]
    C
    ROBERT
    1752.0
    [m]
    C
    ROBERT
    1756.0
    [m]
    C
    ROBERT
    1757.0
    [m]
    C
    ROBERT
    1758.9
    [m]
    C
    ROBERT
    1764.0
    [m]
    DC
    ROBERT
    1767.3
    [m]
    C
    ROBERT
    1794.0
    [m]
    DC
    ROBERT
    1809.0
    [m]
    DC
    ROBERT
    1818.0
    [m]
    DC
    ROBERT
    1833.0
    [m]
    DC
    ROBERT
    1842.0
    [m]
    DC
    ROBERT
    1848.0
    [m]
    DC
    ROBERT
    1854.0
    [m]
    DC
    ROBERT
    1860.0
    [m]
    DC
    ROBERT
  • Lithostratigraphy

    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    153
    713
    1034
    1078
    1698
    1698
    1725
    1730
    1759
    1815
    1854
    1860
    1860
    1865
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    AIT PPC SS PEX
    1155
    1884
    MDT
    1706
    1796
    MWD - ARCVRES9 TELE
    1730
    1890
    MWD - PDX5 ARCVRES9 TELE
    1165
    1735
    MWD - PDX5 ARCVRES9 TELE675
    201
    1165
    ZOVSP
    100
    1884
  • 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
    202.4
    36
    205.6
    0.00
    INTERM.
    13 3/8
    1154.7
    17 1/2
    1165.0
    1.44
    FIT
    OPEN HOLE
    1890.0
    12 1/4
    1890.0
    0.00
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    1165
    1.20
    16.0
    XP-07 - #14
    1165
    1.35
    21.0
    XP-07 - #14
    1747
    1.20
    17.0
    XP-07 - #14
    1890
    1.20
    19.0
    XP-07 - #14