Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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28.04.2024 - 01:35
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25/8-4

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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.
    25/8-4
    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
    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.
    25/8-4
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    EP 91-29 & SP. 314
    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.
    Norsk Hydro Produksjon 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.
    738-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.
    18
    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,
    25.07.1992
    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.
    11.08.1992
    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.
    11.08.1994
    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.
    01.08.2010
    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
    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.
    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.
    25.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    130.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    1891.0
    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).
    1891.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    2.1
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    71
    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.
    HOD 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' 31.31'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 36' 42.97'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6569075.08
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    477871.28
    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.
    1986

  • Wellbore history
    General
    Well 25/8-4 was drilled o the Utsira High, in the vicinity of the Balder Field area in the North Sea. The main objective was to test the hydrocarbon potential of the Paleocene sand in the Hedila structure, a seismic mounded structure within the prospect area. The location of the well was chosen in an area were thick sands were expected to be found in a high structural position. Additional targets were additional younger sand development in the Lista and Sele Formation.
    Operations and results
    Wildcat well 25/8-4 was spudded with the semi-submersible installation Vildkat Explorer on 25 July 1992 and drilled to TD at 1891 m in the Late Cretaceous Hod Formation. No significant problems were encountered during operations. The well was drilled with spud mud down to 241 m and with polymer mud from 241 m to TD. No shallow gas was observed.
    The Lista Formation was encountered at 1710 m. A sequence of thin Heimdal Formation injection sands was recognised in the Lista Formation in the interval down to 1780 m where a 50 m thick massive Heimdal Formation was encountered. In total these injection sands made up 5.9 m net sand, which was all hydrocarbon bearing. Average porosity in this net was 32.0% with an average Sw of 10%. The main Heimdal Formation was found mainly water wet, with only a 1.5 m oil column from the top and down to an OWC at 1781.5 m (1756.5 m TVD MSL). Average porosity in the main Heimdal Formation was 33.9%. Oil shows in the Paleocene sandstones started to appear in top Balder Formation at 1670 m and ended in the OWC in the Heimdal sandstone at 1782 m. In addition, poor shows were observed on limestone over the interval 1841 m - 1852 m in the Ekofisk Formation.
    Twelve cores were cut from 1659.6 m, in the lower part of the Hordaland Group, through the Balder, Lista and Heimdal Formations to 1840 m, 4 m into the top of the Våle Formation. Four good RFT pressure points were recorded in the Lista Formation giving a fluid density of 0.817 g/cc. One fluid sample was collected 1750.7 m and consisted of a mixture of 23 deg API oil, mud filtrate, and gas. Nine good RFT pressure points were taken in the main Heimdal Formation, resulting in a density gradient of 1.02 g/cc in the water zone.
    The well was permanently abandoned on 11 August 1992 as an oil discovery.
    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]
    1320.00
    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
    1659.6
    1670.0
    [m ]
    2
    1672.5
    1694.0
    [m ]
    3
    1695.5
    1706.0
    [m ]
    4
    1722.5
    1746.0
    [m ]
    5
    1746.0
    1759.0
    [m ]
    6
    1759.0
    1777.0
    [m ]
    7
    1777.0
    1794.7
    [m ]
    8
    1794.7
    1811.0
    [m ]
    9
    1812.5
    1829.0
    [m ]
    10
    1830.5
    1837.0
    [m ]
    11
    1837.0
    1837.5
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    154.4
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1659-1664m
    Core photo at depth: 1664-1669m
    Core photo at depth: 1669-1670m
    Core photo at depth: 1672-1677m
    Core photo at depth: 1677-1682m
    1659-1664m
    1664-1669m
    1669-1670m
    1672-1677m
    1677-1682m
    Core photo at depth: 1682-1687m
    Core photo at depth: 1687-1692m
    Core photo at depth: 1692-1694m
    Core photo at depth: 1695-1700m
    Core photo at depth: 1700-1705m
    1682-1687m
    1687-1692m
    1692-1694m
    1695-1700m
    1700-1705m
    Core photo at depth: 1705-1706m
    Core photo at depth: 1722-1727m
    Core photo at depth: 1727-1732m
    Core photo at depth: 1737-1742m
    Core photo at depth: 1742-1746m
    1705-1706m
    1722-1727m
    1727-1732m
    1737-1742m
    1742-1746m
    Core photo at depth: 1746-1751m
    Core photo at depth: 1751-1756m
    Core photo at depth: 1756-1759m
    Core photo at depth: 1759-1764m
    Core photo at depth: 1764-1769m
    1746-1751m
    1751-1756m
    1756-1759m
    1759-1764m
    1764-1769m
    Core photo at depth: 1769-1774m
    Core photo at depth: 1774-1776m
    Core photo at depth: 1777-1782m
    Core photo at depth: 1782-1787m
    Core photo at depth: 1787-1792m
    1769-1774m
    1774-1776m
    1777-1782m
    1782-1787m
    1787-1792m
    Core photo at depth: 1792-1794m
    Core photo at depth: 1794-1799m
    Core photo at depth: 1799-1804m
    Core photo at depth: 1804-1809m
    Core photo at depth: 1809-1811m
    1792-1794m
    1794-1799m
    1799-1804m
    1804-1809m
    1809-1811m
    Core photo at depth: 1812-1817m
    Core photo at depth: 1817-1822m
    Core photo at depth: 1822-1827m
    Core photo at depth: 1827-1829m
    Core photo at depth: 1830-1835m
    1812-1817m
    1817-1822m
    1822-1827m
    1827-1829m
    1830-1835m
    Core photo at depth: 1835-1838m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    1835-1838m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1320.0
    [m]
    DC
    CGG
    1410.0
    [m]
    DC
    CGG
    1535.0
    [m]
    DC
    CGG
    1666.6
    [m]
    C
    CGG
    1673.6
    [m]
    C
    CGG
    1674.4
    [m]
    C
    CGG
    1678.6
    [m]
    C
    CGG
    1679.4
    [m]
    C
    CGG
    1683.5
    [m]
    C
    CGG
    1689.3
    [m]
    C
    CGG
    1693.3
    [m]
    C
    CGG
    1701.2
    [m]
    C
    CGG
    1722.5
    [m]
    C
    CGG
    1726.5
    [m]
    C
    CGG
    1730.8
    [m]
    C
    CGG
    1746.4
    [m]
    C
    CGG
    1746.8
    [m]
    C
    CGG
    1748.2
    [m]
    C
    CGG
    1749.2
    [m]
    C
    CGG
    1750.3
    [m]
    C
    CGG
    1750.5
    [m]
    C
    CGG
    1751.7
    [m]
    C
    CGG
    1756.2
    [m]
    C
    CGG
    1758.5
    [m]
    C
    CGG
    1760.3
    [m]
    C
    CGG
    1764.2
    [m]
    C
    CGG
    1764.8
    [m]
    C
    CGG
    1771.8
    [m]
    C
    CGG
    1773.6
    [m]
    C
    CGG
    1777.7
    [m]
    C
    CGG
    1780.0
    [m]
    C
    CGG
    1782.9
    [m]
    C
    CGG
    1784.9
    [m]
    C
    CGG
    1788.2
    [m]
    C
    CGG
    1790.5
    [m]
    C
    CGG
    1795.5
    [m]
    C
    CGG
    1802.1
    [m]
    C
    CGG
    1808.1
    [m]
    C
    CGG
    1812.5
    [m]
    C
    CGG
    1816.8
    [m]
    C
    CGG
    1819.3
    [m]
    C
    CGG
    1826.7
    [m]
    C
    CGG
    1831.2
    [m]
    C
    CGG
    1833.1
    [m]
    C
    CGG
    1835.8
    [m]
    C
    CGG
    1836.9
    [m]
    C
    CGG

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.35
    pdf
    0.66
    pdf
    5.11

  • 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
    12.73

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CST GR
    1317
    1875
    DIL DSI NGT AMS
    1299
    1889
    DLL MSFL GR
    1299
    1885
    FMI GR
    1299
    1888
    LDL CNL GR
    1299
    1885
    RFT
    1385
    1847
    VELOCITY
    1320
    1870
    VSP
    530
    1760
    VSP
    1740
    1880

  • 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
    241.0
    36
    242.0
    0.00
    LOT
    INTERM.
    9 5/8
    1300.0
    12 1/4
    1301.0
    1.70
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    241
    1.05
    WATER BASED
    1673
    1.28
    18.0
    WATER BASED
    1723
    1.29
    17.0
    WATER BASED
    1759
    1.30
    16.0
    WATER BASED
    1812
    1.29
    16.0
    WATER BASED
    1837
    1.30
    16.0
    WATER BASED
    1840
    1.30
    17.0
    WATER BASED
    1891
    1.30
    19.0
    WATER BASED

  • Pressure plots
    Pressure plots
    The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.
    Pressure plots
    Document name
    Document format
    Document size [MB]
    pdf
    0.19