Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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9/4-1

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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.
    9/4-1
    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
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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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    9/4-1
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    line 5735 & SP 2462 1/2
    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.
    Conoco Norway Inc.
    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.
    11-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.
    50
    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,
    31.03.1968
    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.
    19.05.1968
    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.
    19.05.1970
    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.
    22.04.2005
    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
    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.
    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.
    29.0
    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).
    2963.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    5.25
    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° 35' 2'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    4° 1' 13'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6382987.51
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    561007.44
    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.
    150
  • Wellbore history

    General
    Well 9/4-1 is situated northeast in the Åsta Graben in the Danish-Norwegian Basin. The chosen well location allowed multiple Tertiary to Mesozoic prospects to be tested. The primary objectives of 9/4-1 were Middle Jurassic and Early Triassic (Bunter) sandstones, while basal Tertiary and Early Cretaceous sandstones and Late Cretaceous limestones were secondary objectives.
    The well is Type Well for the Egersund Formation.
    Operations and results
    Wildcat well 9/4-1 was spudded with the jack-up installation Endeavour on 31 Marc 1968 and drilled to TD at 2963 m in Late Permian Zechstein salt. Three casing strings were set in the hole. Seawater was used as drilling fluid down to 1106 m, from where an XP-20 lignosulphonate type mud was used. When the drilling commenced after the 30" conductor pipe was set, several drilling problems arose. The circulation was lost, and the hole fell in repeatedly, so the conductor pipe had to be re-driven and cemented several times until the hole conditions allowed the 20" casing to be set. At 2963 m the drill pipe stuck in salt, and after five days of unsuccessful fishing operations, it was decided to abandon the hole. The lower part of the hole could not be logged due to the unrecovered fish.
    Twenty-five net meter of Jurassic sandstone was penetrated in a sand body (Sandnes Formation) at 2288 m. The section was water wet, but fair shows were logged in the upper 5 m of the sand. The remainder had very scattered poor shows. Porosity averaged 25 percent and examination of sidewall cores indicated a clean permeable sandstone reservoir. The second primary objective, the Bunter Sandstone, was represented by an estimated 60 m of thin interbedded sands and sandstones scattered throughout a thick Triassic section composed predominantly of silty red brown to pastel claystones. Due to lack of logs the interpretation of the Triassic section is somewhat tentative. Late Cretaceous Chalk and Early Cretaceous sandstones proved non- productive due to either the absence of the predicted lithologies or the non-development of reservoir properties in the sediments present. There were no shows in the Triassic or in the secondary target sections. Organic geochemical analyses show excellent source properties in the Late Jurassic Tau Formation with 6 - 7 % TOC and hydrogen index around 250 mg HC/g TOC. Colas and shale in the underlying Vestland and Bryne Formations also show good source potentials. Vitrinite data indicate top oil window maturity already at ca 2000 m.
    No conventional cores were cut. Sixty-nine out of 73 attempted sidewall cores were retrieved over the interval 2196 m to 2415 m in the Jurassic and Triassic sections. No fluid samples were taken.
    The well was permanently abandoned on 19 May 1968 as a dry hole with shows.
    Testing
    No drill stem test was performed.
  • 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
    0.49
    pdf
    0.94
    pdf
    0.77
  • 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
    0.80
    pdf
    1.55
  • Documents – Norwegian Offshore Directorate papers

    Documents – Norwegian Offshore Directorate papers
    Document name
    Document format
    Document size [MB]
    pdf
    13.95
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    BHC GR
    333
    1006
    BHC GR
    975
    2416
    FDC
    1092
    2419
    GR
    300
    333
    IES
    333
    1106
    IES
    1092
    2419
  • 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
    144.0
    48
    146.0
    0.00
    LOT
    SURF.COND.
    20
    334.0
    26
    335.0
    0.00
    LOT
    INTERM.
    13 3/8
    1092.0
    17 1/2
    1094.0
    0.00
    LOT
    OPEN HOLE
    2963.0
    12 1/4
    2963.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    1106
    1.02
    seawater
    2252
    1.23
    Spersene XP
    2963
    1.25
    Spersene XP