Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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22.11.2024 - 09:09
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16/4-1

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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.
    16/4-1
    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.
    16/4-1
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    NH 8105 - 306 SP. 752
    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.
    432-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.
    72
    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,
    08.09.1984
    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.
    18.11.1984
    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.
    18.11.1986
    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.
    25.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    96.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2909.0
    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).
    2909.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    2.5
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    96
    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.
    PRE-DEVONIAN
    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.
    BASEMENT
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    58° 38' 18.33'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 8' 17.03'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6500262.06
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    449959.99
    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.
    229

  • Wellbore history
    General
    Well 16/4-1 is located on the Utsira High. The primary objective of the well was to test the Paleocene Heimdal Formation. Secondary objectives were Jurassic and Triassic sandstones, Zechstein carbonates and Rotliegendes conglomerates. The well was planned to reach TD at 2850 m + 100 m after having identified a seismic reflector at this depth, interpreted to represent Top Metamorphic Basement.
    Operations and results
    Wildcat well 16/4-1 was spudded with the semi-submersible installation Treasure Seeker on 8 September 1984 and drilled to TD at 2909 m in crystalline/metamorphic basement of Early Paleozoic age. Under the 30" casing shoe a 17 1/2" pilot hole was drilled. At 494 m in Pleistocene sand and shale, the well started to flow up the annulus from a small gas pocket. The well died out by itself but there were problems with lost circulation, so a cement plug was set from 494 - 415 m. The cement was drilled out to 480 m and the hole was underreamed to 26" before landing of the 20" casing. No other major problems occurred during drilling of this well. The well was drilled with seawater and bentonite down to 494 m, with KCl/polymer mud from 494 m to 2052 m, and with NaCl/polymer mud from 2052 m to TD.
    The well 16/4-1 encountered water-bearing sandstones in the Paleocene Heimdal Formation as well as in the Triassic. The latter is a 36 m thick sand in between the Smith Bank Formation and the Zechstein Group. The Heimdal Formation Sandstones occur as interbedded sand/claystone in the upper part (2100 m to 2142 m) and as a massive sandstone, which is homogenous and very clean in the lower part (2142 m 2277 m). The Triassic sandstones (2394 m to 2430 m) were very fine-to-fine grained with a considerable amount of silt and mica. Log evaluations over these sands gave the following results: The interval 2100 m to 2142 m gave a net/gross ratio of 0.095, with an average porosity of 23,06% and a shale volume of 43,58% after cut-off. The interval 2142 m to 2277 m had a N/G of 0,89 with 26,36% average porosity and 11,19% shale volume. The Triassic interval (2394 m to 2430 m) had a net/gross of 0,37 with 22,88% average porosity and 18,54% shale volume. All these values are calculated after a cut-off of 20% (1 mD). Twenty-five pressure tests (RFT) were performed from 2083 m to 2422.4 m. These gave a water gradient of 0,445 psi/ft (1.024 g/cc) in the Heimdal Fm sandstones. No pressure data were obtained from the Triassic.
    Three cores were cut in this well, the first and second in sandstones of the Heimdal and Smith Bank formations respectively. The third core was taken in metamorphic/crystalline basement. Core 1 was cut from 2161 m to 2174 m in the Heimdal formation. The recovered core of 11 m (85%) consisted of very fine to medium grained, poorly sorted sandstone with claystone in the interval 2170-71 m. Core 2 was cut from 2404 m to 2422 m and 17.5 m (97%) was recovered. The core was cut in the Triassic sand under the Smith Bank Formation. It consisted of micaceous sandstones and siltstones with subordinate clay clasts. Core 3 was cut from 2907 m to 2909 m in the Basement and 100% was recovered. The core consisted of schist and granite. No fluid samples were collected. The well was permanently abandoned on 18 November 1984 as a dry well.
    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]
    210.00
    2907.00

  • 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
    2161.0
    2172.0
    [m ]
    2
    2404.0
    2421.5
    [m ]
    3
    2907.0
    2909.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    30.5
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 2161-2166m
    Core photo at depth: 2166-2171m
    Core photo at depth: 2171-2172m
    Core photo at depth: 2404-2409m
    Core photo at depth: 2409-2414m
    2161-2166m
    2166-2171m
    2171-2172m
    2404-2409m
    2409-2414m
    Core photo at depth: 2414-2419m
    Core photo at depth: 2419-2421m
    Core photo at depth: 2907-2909m
    Core photo at depth:  
    Core photo at depth:  
    2414-2419m
    2419-2421m
    2907-2909m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2035.0
    [m]
    SWC
    RRI
    2057.0
    [m]
    SWC
    RRI
    2073.0
    [m]
    SWC
    RRI
    2092.0
    [m]
    SWC
    RRI
    2108.0
    [m]
    SWC
    RRI
    2118.5
    [m]
    SWC
    RRI
    2131.0
    [m]
    SWC
    RRI
    2146.0
    [m]
    SWC
    RRI
    2161.0
    [m]
    C
    RRI
    2171.3
    [m]
    C
    RRI
    2172.0
    [m]
    C
    RRI
    2196.0
    [m]
    SWC
    RRI
    2258.0
    [m]
    SWC
    RRI

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.59

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.62

  • 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
    1.92
    pdf
    12.08

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL
    125
    2015
    CET CBL VDL
    450
    2015
    CST
    2035
    2340
    CST
    2345
    2896
    ISF LSS GR SP
    206
    2027
    ISF LSS GR SP
    2406
    2907
    ISF MSFL LSS GR SP
    2028
    2666
    LDL CNL CAL GR
    472
    2907
    RFT
    2083
    2422
    SHDT
    2016
    2908
    VSP
    200
    2909

  • 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
    206.0
    36
    280.0
    0.00
    LOT
    SURF.COND.
    20
    480.0
    26
    497.0
    1.37
    LOT
    INTERM.
    16
    626.0
    22
    650.0
    1.89
    LOT
    INTERM.
    13 3/8
    2028.0
    17 1/2
    2066.0
    1.79
    LOT
    OPEN HOLE
    2909.0
    12 1/4
    2909.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    150
    0.00
    WATER BASED
    14.11.1984
    280
    1.09
    5.0
    2.0
    WATER BASED
    10.09.1984
    494
    1.10
    WATER BASED
    12.09.1984
    494
    1.10
    WATER BASED
    13.09.1984
    494
    1.10
    WATER BASED
    14.09.1984
    494
    1.10
    WATER BASED
    16.09.1984
    494
    1.10
    WATER BASED
    17.09.1984
    494
    1.10
    WATER BASED
    18.09.1984
    494
    1.10
    WATER BASED
    13.09.1984
    494
    1.10
    WATER BASED
    17.09.1984
    494
    1.10
    WATER BASED
    18.09.1984
    494
    1.10
    WATER BASED
    20.09.1984
    494
    1.10
    WATER BASED
    19.09.1984
    494
    1.10
    WATER BASED
    20.09.1984
    494
    1.10
    WATER BASED
    14.09.1984
    494
    1.10
    WATER BASED
    16.09.1984
    494
    1.10
    WATER BASED
    19.09.1984
    497
    1.15
    17.0
    95.0
    WATER BASED
    25.09.1984
    572
    1.25
    15.0
    7.0
    WATER BASED
    12.11.1984
    625
    1.16
    16.0
    9.0
    WATER BASED
    25.09.1984
    625
    1.16
    14.0
    9.0
    WATER BASED
    26.09.1984
    625
    1.16
    14.0
    10.0
    WATER BASED
    27.09.1984
    625
    1.16
    14.0
    11.0
    WATER BASED
    01.10.1984
    625
    1.16
    14.0
    11.0
    WATER BASED
    01.10.1984
    625
    1.16
    14.0
    9.0
    WATER BASED
    26.09.1984
    625
    1.16
    14.0
    10.0
    WATER BASED
    27.09.1984
    650
    1.15
    15.0
    8.0
    WATER BASED
    01.10.1984
    712
    1.16
    19.0
    8.0
    WATER BASED
    01.10.1984
    1112
    1.16
    19.0
    8.0
    WATER BASED
    01.10.1984
    1507
    1.18
    19.0
    10.0
    WATER BASED
    02.10.1984
    1507
    1.25
    15.0
    9.0
    WATER BASED
    03.10.1984
    1507
    1.25
    15.0
    9.0
    WATER BASED
    03.10.1984
    1602
    1.30
    17.0
    10.0
    WATER BASED
    04.10.1984
    1813
    1.30
    18.0
    8.0
    WATER BASED
    07.10.1984
    1825
    1.30
    16.0
    8.0
    WATER BASED
    14.10.1984
    1870
    1.25
    16.0
    8.5
    WATER BASED
    12.11.1984
    1870
    1.25
    16.0
    8.5
    WATER BASED
    14.11.1984
    1870
    1.25
    16.0
    8.5
    WATER BASED
    14.11.1984
    1957
    1.30
    16.0
    8.0
    WATER BASED
    07.10.1984
    1988
    1.30
    24.0
    13.0
    WATER BASED
    14.10.1984
    2052
    1.30
    32.0
    11.0
    WATER BASED
    14.10.1984
    2052
    1.30
    9.0
    10.0
    WATER BASED
    15.10.1984
    2052
    1.25
    20.0
    13.0
    WATER BASED
    16.10.1984
    2052
    1.30
    18.0
    9.0
    WATER BASED
    08.10.1984
    2052
    1.30
    18.0
    8.0
    WATER BASED
    10.10.1984
    2052
    1.30
    15.0
    8.0
    WATER BASED
    11.10.1984
    2052
    1.30
    18.0
    9.0
    WATER BASED
    08.10.1984
    2052
    1.30
    18.0
    8.5
    WATER BASED
    09.10.1984
    2052
    1.30
    18.0
    8.0
    WATER BASED
    10.10.1984
    2052
    1.30
    15.0
    8.0
    WATER BASED
    11.10.1984
    2052
    1.30
    32.0
    11.0
    WATER BASED
    14.10.1984
    2052
    1.30
    9.0
    10.0
    WATER BASED
    15.10.1984
    2052
    1.25
    20.0
    13.0
    WATER BASED
    16.10.1984
    2052
    1.30
    18.0
    12.0
    WATER BASED
    07.10.1984
    2052
    1.30
    18.0
    8.5
    WATER BASED
    09.10.1984
    2066
    1.23
    16.0
    8.0
    WATER BASED
    17.10.1984
    2161
    1.20
    19.0
    9.5
    WATER BASED
    18.10.1984
    2161
    1.20
    14.0
    5.0
    WATER BASED
    22.10.1984
    2161
    1.21
    15.0
    9.5
    WATER BASED
    21.10.1984
    2161
    1.21
    15.0
    9.5
    WATER BASED
    21.10.1984
    2161
    1.20
    14.0
    5.0
    WATER BASED
    22.10.1984
    2174
    1.20
    13.0
    7.0
    WATER BASED
    23.10.1984
    2283
    1.25
    20.0
    7.0
    WATER BASED
    24.10.1984
    2355
    1.25
    18.0
    7.0
    WATER BASED
    25.10.1984
    2404
    1.25
    17.0
    8.0
    WATER BASED
    29.10.1984
    2440
    1.25
    18.0
    9.0
    WATER BASED
    29.10.1984
    2501
    1.25
    18.0
    9.0
    WATER BASED
    29.10.1984
    2573
    1.25
    46.0
    10.0
    WATER BASED
    31.10.1984
    2588
    1.25
    18.0
    10.0
    WATER BASED
    31.10.1984
    2588
    1.25
    18.0
    10.0
    WATER BASED
    01.11.1984
    2588
    1.25
    18.0
    10.0
    WATER BASED
    01.11.1984
    2672
    1.25
    19.0
    9.0
    WATER BASED
    02.11.1984
    2733
    1.25
    19.0
    8.0
    WATER BASED
    05.11.1984
    2795
    1.25
    19.0
    8.0
    WATER BASED
    05.11.1984
    2854
    1.25
    19.0
    8.0
    WATER BASED
    05.11.1984
    2892
    1.25
    45.0
    25.0
    WATER BASED
    06.11.1984
    2907
    1.25
    18.0
    8.5
    WATER BASED
    07.11.1984
    2909
    1.25
    18.0
    8.5
    WATER BASED
    08.11.1984
    2909
    1.25
    18.0
    8.5
    WATER BASED
    09.11.1984
    2909
    1.25
    15.0
    7.0
    WATER BASED
    12.11.1984
    2909
    1.25
    18.0
    8.5
    WATER BASED
    09.11.1984
    2909
    1.25
    15.0
    7.0
    WATER BASED
    12.11.1984

  • 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
    0.22