Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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22.12.2024 - 01:25
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25/11-19 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.
    25/11-19 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).
    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
    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
    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.
    25/11-19
    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.
    Esso Exploration and Production Norway A/S
    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.
    811-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.
    25
    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,
    24.04.1995
    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.
    18.05.1995
    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.
    18.05.1997
    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.
    29.08.2003
    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.
    APPRAISAL
    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.
    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.
    EOCENE
    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.
    INTRA BALDER FM SS
    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.
    PALEOCENE
    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.
    HERMOD FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    25.0
    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).
    2250.0
    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).
    2044.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    39.16
    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 TRIASSIC
    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.
    STATFJORD GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 12' 48.48'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 24' 6.88'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6564126.95
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    465849.93
    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.
    2562

  • Wellbore history
    General
    Well 25/11-19 S was drilled on Licence 001, awarded in the first licence round in 1965. It was the last appraisal well on the Balder Field before it was decided to go ahead with Plan for Development in 1995. The well was located to penetrate the top reservoir of " Balder Mound 6" in a well-defined structurally high position. The primary target was a massive sand in the Hermod Formation; the secondary target was the Eocene Balder Formation Sand. The general objective of well 25/11-19 S was to reduce the range of uncertainty associated with the reserve basis for Balder Mound 6. The well was drilled as a directional well for potential re-entry as a future horizontal producer.
    Operations and results
    Appraisal well 25/11-19 S was spudded with the semi-submersible installation "Vildkat Explorer" on 24 April 1995 and drilled to TD at 2250 m (2019 m TVD SS) in Triassic (Late Rhaetian) sediments of the Statfjord Formation. The well was drilled with seawater spud mud down to 1015 m and with oil based "Safemul" mud from 1015 m to TD. Shallow gas was neither prognosed nor observed. The well was drilled vertically down to 1032 m before starting to build angle and at top of the primary target, the Hermod sand, the deviation was 38.2 deg. . An 8 1/2" inch hole was drilled to an intermediate depth of 2096 m where an extensive wire line logging program was performed. Then an 8 1/2" hole was drilled to TD of 2250 m and final logging was performed. The 25/11-19 S confirmed oil in the Hermod sand. A good oil water contact was defined by wire line logs, extensive MDT sampling and pressures at 1922.5 m (1760.5 m TVD SS) in the Hermod reservoir sand. Furthermore, gas reserves were proved in the secondary target, the Balder Formation sand, and pressure data indicated a potential GOC at 1839.2 m (1694.8 m TVD SS). Three cores were cut in the Sele and Hermod Formations from 1871 to 1937 m. Wire line fluid samples were taken at 9 different depths using the MDT tool: gas was sampled at 1815.5 m, 1815.6 m, 1816.1 m, and 1834.1 m in the Balder Formation; oil was sampled at 1898 m, 1901.9 m, and 1920 m in the Hermod Formation; and water was sampled at 1182.7 m& in the Skade Formation and at 1961.6 m in the Hermod Formation. The well was plugged below the 13 3/8" casing and temporarily abandoned for possible re-entry as a horizontal oil producer. The well (25/11-19 S R) was re-entered and plugged using the semi-submersible installation "West Alpha" on 1 May 1997. It was permanently abandoned as an oil and gas appraisal well on 6 May 1997.
    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
    2250.00

  • 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
    1871.0
    1889.4
    [m ]
    2
    1889.4
    1908.5
    [m ]
    3
    1908.5
    1936.7
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    65.7
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1871-1875m
    Core photo at depth: 1875-1879m
    Core photo at depth: 1879-1883m
    Core photo at depth: 1883-1887m
    Core photo at depth: 1887-1889m
    1871-1875m
    1875-1879m
    1879-1883m
    1883-1887m
    1887-1889m
    Core photo at depth: 1889-1893m
    Core photo at depth: 1893-1897m
    Core photo at depth: 1897-1901m
    Core photo at depth: 1901-1905m
    Core photo at depth: 1905-1908m
    1889-1893m
    1893-1897m
    1897-1901m
    1901-1905m
    1905-1908m
    Core photo at depth: 1908-1912m
    Core photo at depth: 1912-1916m
    Core photo at depth: 1916-1920m
    Core photo at depth: 1920-1924m
    Core photo at depth: 1924-1928m
    1908-1912m
    1912-1916m
    1916-1920m
    1920-1924m
    1924-1928m
    Core photo at depth: 1928-1932m
    Core photo at depth: 1932-1936m
    Core photo at depth: 1936-1937m
    Core photo at depth:  
    Core photo at depth:  
    1928-1932m
    1932-1936m
    1936-1937m

  • 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.
    30
    227.0
    36
    230.0
    0.00
    LOT
    INTERM.
    13 3/8
    1000.0
    17 1/2
    1015.0
    0.00
    LOT
    OPEN HOLE
    2250.0
    8 1/2
    2250.0
    1.60
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    AIT LDT APS HNGS NGT
    1000
    2093
    CST GR
    1030
    2230
    LDT CNL DSI GR
    1793
    2248
    MDT GR
    1081
    1983
    MDT GR
    1179
    1920
    MDT GR
    1855
    2232
    MWD - GR RES DEN NEU DIR
    1015
    2250
    MWD - GR RES DIR
    229
    1015
    UBI DSI GR
    1000
    2096
    VSP-MULTI TOOL
    1000
    2145

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.42

  • 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
    82.40

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    229
    1.13
    DUMMY
    230
    1.08
    DUMMY
    950
    1.08
    DUMMY
    1018
    1.42
    53.0
    WATER BASED
    1224
    1.35
    49.0
    OIL BASED
    1718
    1.37
    50.0
    WATER BASED
    1871
    1.37
    37.0
    OIL BASED
    1909
    1.37
    44.0
    OIL BASED
    1937
    1.37
    40.0
    OIL BASED
    2096
    1.37
    49.0
    OIL BASED
    2250
    1.37
    65.0
    OIL BASED

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1030.6
    [m]
    SWC
    STRATLAB
    1064.0
    [m]
    SWC
    STRATL
    1159.5
    [m]
    SWC
    STRATL
    1291.5
    [m]
    SWC
    STRATL
    1296.0
    [m]
    SWC
    STRATL
    1311.5
    [m]
    SWC
    STRATL
    1325.5
    [m]
    SWC
    STRATL
    1329.0
    [m]
    SWC
    STRATL
    1331.0
    [m]
    SWC
    STRATL
    1351.0
    [m]
    SWC
    STRATL
    1374.0
    [m]
    SWC
    STRATL
    1393.0
    [m]
    SWC
    STRATL
    1405.0
    [m]
    SWC
    STRATL
    1435.0
    [m]
    SWC
    STRATL
    1456.0
    [m]
    SWC
    STRATL
    1462.2
    [m]
    SWC
    STRATL
    1520.0
    [m]
    SWC
    STRATL
    1546.4
    [m]
    SWC
    STRATL
    1678.0
    [m]
    SWC
    STRATL
    1738.0
    [m]
    SWC
    STRATL
    1760.0
    [m]
    SWC
    STRATL
    1777.0
    [m]
    SWC
    STRATL
    1785.5
    [m]
    SWC
    STRATL
    1790.5
    [m]
    SWC
    STRATL
    1792.5
    [m]
    SWC
    STRATL
    1795.5
    [m]
    SWC
    STRATL
    1798.0
    [m]
    SWC
    STRATL
    1803.5
    [m]
    SWC
    STRATL
    1808.0
    [m]
    SWC
    STRATL
    1813.5
    [m]
    SWC
    STRATL
    1821.0
    [m]
    SWC
    STRATL
    1823.5
    [m]
    SWC
    STRATL
    1834.0
    [m]
    SWC
    STRATL
    1847.0
    [m]
    SWC
    STRATL
    1860.5
    [m]
    SWC
    STRATL
    1860.5
    [m]
    SWC
    STRATL
    1866.4
    [m]
    SWC
    STRATL
    1872.0
    [m]
    SWC
    STRATL
    1881.9
    [m]
    SWC
    STRATL
    1887.5
    [m]
    SWC
    STRATL
    1895.8
    [m]
    SWC
    STRATL
    1901.8
    [m]
    SWC
    STRATL
    1910.0
    [m]
    SWC
    STRATL
    1916.0
    [m]
    SWC
    STRATL
    1928.8
    [m]
    SWC
    STRATL
    1931.7
    [m]
    SWC
    STRATL
    1988.5
    [m]
    SWC
    STRATL
    1992.5
    [m]
    SWC
    STRATL
    2000.0
    [m]
    SWC
    STRATL
    2005.5
    [m]
    SWC
    STRATL
    2026.0
    [m]
    SWC
    STRATL
    2031.5
    [m]
    SWC
    STRATL
    2042.9
    [m]
    SWC
    STRATL
    2047.0
    [m]
    SWC
    STRATL
    2170.0
    [m]
    SWC
    STRATL
    2180.0
    [m]
    SWC
    STRATL
    2190.0
    [m]
    SWC
    STRATL
    2195.0
    [m]
    SWC
    STRATL
    2200.0
    [m]
    SWC
    STRATL
    2210.0
    [m]
    SWC
    STRATL
    2220.0
    [m]
    SWC
    STRATL
    2230.0
    [m]
    SWC
    STRATL
    2240.0
    [m]
    SWC
    STRATL
    2250.0
    [m]
    SWC
    STRATL

  • Thin sections at the Norwegian Offshore Directorate
    Thin sections at the Norwegian Offshore Directorate
    Depth
    Unit
    1908.56
    [m ]
    1910.13
    [m ]
    1910.80
    [m ]
    1911.80
    [m ]
    1912.85
    [m ]
    1913.80
    [m ]
    1914.80
    [m ]
    1915.85
    [m ]
    1917.14
    [m ]
    1917.80
    [m ]
    1919.15
    [m ]
    1922.93
    [m ]
    1924.38
    [m ]
    1935.30
    [m ]
    1921.30
    [m ]
    1921.05
    [m ]
    1920.05
    [m ]
    1922.05
    [m ]
    1922.85
    [m ]
    1923.35
    [m ]
    1925.30
    [m ]
    1926.40
    [m ]
    1928.05
    [m ]
    1932.05
    [m ]
    1934.05
    [m ]