Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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21.11.2024 - 01:28
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30/4-1

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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.
    30/4-1
    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
    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.
    30/4-1
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    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.
    BP Norway Limited U.A.
    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.
    205-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.
    195
    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,
    01.11.1978
    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.
    14.05.1979
    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.
    14.05.1981
    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.
    24.09.2004
    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.
    DRY
    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.
    24.3
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    120.5
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    5454.0
    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).
    5448.0
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    161
    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.
    EARLY JURASSIC
    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.
    DRAKE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 37' 20.87'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 9' 34.61'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6721189.29
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    454007.11
    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.
    377

  • Wellbore history
    General
    Well 30/4-1 is located north of the Hild Discovery and west of the Oseberg Field. The main target was Middle Jurassic sandstones in a complex fault and dip-controlled closure. Secondary targets were Palaeogene sands (Balder and Sele Formations) and possible Late Jurassic sands, both in simple dip closures.
    Operations and results
    Wildcat well 30/4-1 was spudded with the semi-submersible installation SEDCO 707 on 1 November 1978 and drilled to TD at 5454 m in the Early Jurassic Dunlin Group.
    The well penetrated a mainly argillaceous Palaeogene section. However, a distinct interval of interbedded thin argillaceous water-bearing sandstones (beds 1 - 3 m thick) with thicker mudstone intervals was drilled between 2116.5 and 2162.5. The net/gross ratio of this interval was about 0.2 (20%) and the sandstone porosities average around 30% (from Schlumberger logs). The well then penetrated a thick argillaceous Cretaceous and Late Jurassic interval. No Late Jurassic sandstones were developed. Water bearing, Middle Jurassic sandstones of the Brent Group were encountered at 5181.5 m. This target group was 218.2 m thick, had a net/gross ratio of about 0.66 (66%) and had sandstone porosities ranging from around 4-16% (from Schlumberger logs). Shows were recorded in limestones in the interval 2545 m to 2570 m, with weaker shows extending down to 2630 m. Weak shows were also noted in the interval 2900 m to 3000 m. Geochemical analyses of cuttings confirmed migrant "medium gravity oil" in the interval 2570 m to 2630 m. No conventional cores were cut. Wire line RFT samples were attempted but all failed.
    The well was permanently abandoned as dry on 14 May 1979.
    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]
    290.00
    5453.00

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    4469.0
    [m]
    DC
    FUGRO
    4478.0
    [m]
    DC
    FUGRO
    4526.0
    [m]
    DC
    FUGRO
    4607.0
    [m]
    DC
    FUGRO
    4691.0
    [m]
    DC
    FUGRO
    4859.0
    [m]
    DC
    FUGRO
    5000.0
    [m]
    DC
    FUGRO
    5009.0
    [m]
    DC
    FUGRO
    5024.0
    [m]
    DC
    FUGRO
    5045.0
    [m]
    DC
    FUGRO
    5060.0
    [m]
    DC
    FUGRO
    5174.0
    [m]
    DC
    FUGRO

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.56

  • Geochemical information

  • 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
    14.20

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    BHC GR
    4950
    5180
    CBL VDL GR CCL
    140
    4047
    CBL VDL GR CCL
    140
    2500
    CBL VDL GR CCL
    3750
    4048
    CST
    1075
    2318
    CST
    2450
    4062
    FDC CNL GR C
    1924
    2275
    ISF BHC GR SP
    145
    957
    ISF BHC GR SP
    1930
    2097
    ISF BHC GR SP
    2275
    3554
    ISF BHC GR SP C
    1050
    2340
    ISF BHC GR SP C
    3500
    4064
    ISF BHC GR SP C
    4048
    4534
    ISF BHC GR SP C
    4465
    5029
    ISF BHC GR SP C
    4950
    5182
    ISF BHC GR SP C
    4950
    5180
    RFT
    3526
    3607
    RFT 1
    5187
    0
    RFT 1-5
    5220
    5415
    WST
    400
    4062
    WST
    2016
    5445

  • 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
    282.0
    36
    288.0
    0.00
    LOT
    SURF.COND.
    18 5/8
    1051.0
    26
    1059.0
    0.00
    LOT
    INTERM.
    13 3/8
    2335.0
    17 1/2
    2345.0
    0.00
    LOT
    INTERM.
    9 5/8
    4048.0
    12 1/4
    4072.0
    0.00
    LOT
    OPEN HOLE
    5454.0
    8 3/8
    5454.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    177
    1.05
    35.0
    spud mud
    666
    1.08
    61.0
    seawater
    1058
    1.09
    67.0
    seawater
    2100
    1.26
    45.0
    seawater
    2345
    1.26
    55.0
    seawater
    2862
    1.53
    68.0
    seawater
    3583
    1.70
    64.0
    seawater
    4072
    1.79
    54.0
    seawater
    4819
    1.98
    53.0
    seawater
    5454
    2.07
    55.0
    seawater