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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9/8-1

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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.
    9/8-1
    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
    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
    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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    9/8-1
    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.
    5-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.
    38
    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,
    23.05.1968
    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.
    29.06.1968
    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.
    29.06.1970
    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.
    25.04.2005
    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
    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 SHOWS
    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.
    68.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2176.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    4
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    75
    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 PERMIAN
    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.
    ZECHSTEIN GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    57° 20' 33.97'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    4° 20' 12.98'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6356476.03
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    580468.98
    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.
    145

  • Wellbore history
    General
    The 9/8-1 well is located in the central western part of the Norwegian-Danish Basin in the North Sea. The objective was to test the hydrocarbon potential of the sedimentary section present on the crest of a closed seismic structure interpreted to be a salt pillow. Prospective reservoir sands were anticipated towards the base of the Tertiary, in the Early Cretaceous and in the Early Triassic.
    Operations and results
    Wildcat well 9/8-1 was spudded with the jack-up installation Endeavour on 23 May 1968 and drilled to TD at 2176 m in the Late Permian Zechstein Group. It was the first well drilled in Norwegian waters with a jack-up platform. After the 36" conductor was set at 137 m, the hole was drilled with a 17 1/2" bit to 411 m. While reaming the hole to 26", cavings and fill of shell fragments and gravel caused problems from about 300 m, necessitating the 20" casing to be set high at 360 m. The only additional drilling problem of note was a twist off while drilling at 1546 m. The fish was recovered in a few hours without difficulty. From here, operations were successfully carried out to TD. Initial drilling from the sea floor to 1350 feet was with seawater and gel without casing. Returns were to the sea floor. Below 1350 to TD at 7138 feet, a Spersene, XP-20, Salinex mud with up to 10 % diesel oil was used.
    The interpreted salt pillow structure was found to be a piercement which breached the Triassic with the result that the
    Triassic Bunter sand section was not present in this well. Top Permian Zechstein evaporites at 2109 m were immediately overlain by the Middle Jurassic Dogger formation. The Dogger contained some porous sandstones (Sandnes Formation) but these had only weak shows in the uppermost few feet and the logs indicated high water saturation. Both the Lower Cretaceous and the entire Tertiary section consisted mainly of clays. No sands were developed at the base of either the Lower Cretaceous or the Tertiary Eocene. Immature shales with good to excellent source rock properties were penetrated in the Late Jurassic. Two conventional cores were cut, from 1926 m to 1933.3 m in the Sandnes Formation and 2114.1 m to 2130.6 m in the Zechstein Group. Fluid sampling with the FIT tool at 2061.1 m, 2061.7 m, 1991.9 m, and at 1926.3 m. The two first of these were seal failures and recovered traces of sand together with mud, the third recovered only mud in a tight formation, the fourth successfully recovered formation water and some mud. No hydrocarbons were reported in any of the samples.
    The well was permanently abandoned on 29 June 1968 as a dry hole with shows.
    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]
    1410.00
    7138.00

  • 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
    1926.0
    1933.4
    [m ]
    2
    2114.0
    2130.6
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    23.9
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • 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
    36
    138.0
    48
    145.0
    0.00
    LOT
    SURF.COND.
    20
    360.0
    26
    412.0
    0.00
    LOT
    INTERM.
    13 3/8
    1265.0
    17 1/2
    1279.0
    0.00
    LOT
    OPEN HOLE
    2176.0
    12 1/4
    2176.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CDM
    1266
    2131
    FDC
    1266
    2133
    GR
    30
    360
    IES
    360
    2133
    MLL-C
    416
    2133
    SGR-C
    360
    2130
    TS
    44
    1252

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.24

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    4.43
    pdf
    0.39

  • 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
    3.96

  • Documents – Norwegian Offshore Directorate papers
    Documents – Norwegian Offshore Directorate papers
    Document name
    Document format
    Document size [MB]
    pdf
    10.85
    pdf
    40.26

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    137
    0.00
    seawater
    360
    1.11
    seawater
    1219
    1.13
    waterbased
    2175
    1.15
    waterbased

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2490.0
    [ft]
    DC
    2520.0
    [ft]
    DC
    2580.0
    [ft]
    DC
    2670.0
    [ft]
    DC
    2760.0
    [ft]
    DC
    2910.0
    [ft]
    DC
    2970.0
    [ft]
    DC
    3000.0
    [ft]
    DC
    3120.0
    [ft]
    DC
    3150.0
    [ft]
    DC
    3180.0
    [ft]
    DC
    3210.0
    [ft]
    DC
    3360.0
    [ft]
    DC
    3390.0
    [ft]
    DC
    3420.0
    [ft]
    DC
    3510.0
    [ft]
    DC
    3540.0
    [ft]
    DC
    3630.0
    [ft]
    DC
    3660.0
    [ft]
    DC
    3720.0
    [ft]
    DC
    3750.0
    [ft]
    DC
    3780.0
    [ft]
    DC
    3810.0
    [ft]
    DC
    3840.0
    [ft]
    DC
    3870.0
    [ft]
    DC
    3900.0
    [ft]
    DC
    3930.0
    [ft]
    DC
    3990.0
    [ft]
    DC
    4020.0
    [ft]
    DC
    4080.0
    [ft]
    DC
    4140.0
    [ft]
    DC
    4170.0
    [ft]
    DC
    4200.0
    [ft]
    DC
    4210.0
    [ft]
    DC
    4250.0
    [ft]
    DC
    4260.0
    [ft]
    DC
    4300.0
    [ft]
    DC
    4310.0
    [ft]
    DC
    4400.0
    [ft]
    DC
    4500.0
    [ft]
    DC
    4600.0
    [ft]
    DC
    4700.0
    [ft]
    DC
    4800.0
    [ft]
    DC
    4900.0
    [ft]
    DC
    5000.0
    [ft]
    DC
    5100.0
    [ft]
    DC
    5200.0
    [ft]
    DC
    5240.0
    [ft]
    DC
    5260.0
    [ft]
    DC
    5270.0
    [ft]
    SWC
    5280.0
    [ft]
    DC
    5300.0
    [ft]
    DC
    5320.0
    [ft]
    DC
    5400.0
    [ft]
    DC
    5420.0
    [ft]
    DC
    5500.0
    [ft]
    DC
    5515.0
    [ft]
    SWC
    5600.0
    [ft]
    DC
    5700.0
    [ft]
    DC
    5761.0
    [ft]
    SWC
    5800.0
    [ft]
    DC
    5900.0
    [ft]
    DC
    5920.0
    [ft]
    SWC
    5920.0
    [ft]
    DC
    5960.0
    [ft]
    DC
    6000.0
    [ft]
    DC
    6020.0
    [ft]
    DC
    6050.0
    [ft]
    SWC
    6100.0
    [ft]
    DC
    6120.0
    [ft]
    DC
    6160.0
    [ft]
    DC
    6190.0
    [ft]
    SWC
    6200.0
    [ft]
    DC
    6270.0
    [ft]
    SWC
    6300.0
    [ft]
    DC
    6320.0
    [ft]
    DC
    6320.0
    [ft]
    DC
    6322.0
    [ft]
    C
    STRATLAB
    6323.0
    [ft]
    DC
    6325.0
    [ft]
    C
    STRATLAB
    6328.0
    [ft]
    C
    STRATL
    6331.0
    [ft]
    C
    STRATL
    6334.0
    [ft]
    C
    STRATL
    6334.0
    [ft]
    DC
    6337.0
    [ft]
    C
    STRATLAB
    6339.0
    [ft]
    DC
    6340.0
    [ft]
    C
    STRATLAB
    6343.0
    [ft]
    C
    STRATL
    6358.0
    [ft]
    SWC
    6400.0
    [ft]
    DC
    6400.0
    [ft]
    SWC
    6445.0
    [ft]
    SWC
    6500.0
    [ft]
    DC
    6540.0
    [ft]
    SWC
    6574.0
    [ft]
    SWC
    6600.0
    [ft]
    DC
    6700.0
    [ft]
    DC
    6715.0
    [ft]
    SWC
    6760.0
    [ft]
    SWC
    6800.0
    [ft]
    DC
    6900.0
    [ft]
    DC
    6925.0
    [ft]
    SWC
    7000.0
    [ft]
    DC
    7100.0
    [ft]
    DC
    7138.0
    [ft]
    DC