Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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14.04.2024 - 01:31
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34/10-8

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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.
    34/10-8
    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).
    APPRAISAL
    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.
    34/10-8
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    S3D - 236 SP. 170
    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.
    Den norske stats oljeselskap 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.
    243-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.
    84
    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,
    03.03.1980
    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.
    25.05.1980
    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.
    25.05.1982
    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.
    14.11.2012
    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.
    APPRAISAL
    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.
    NO
    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.
    MIDDLE JURASSIC
    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.
    BRENT GP
    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.
    133.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2214.0
    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).
    2213.7
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    2.7
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    84
    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.
    COOK FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    61° 9' 59.53'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 12' 3.44'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6781760.88
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    457008.04
    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.
    230
  • Wellbore history

    General
    Well 34/10-8 was drilled on the southern part of the Gullfaks Field. The primary objective was to test sandstones of Middle Jurassic age. Secondary objectives were sandstones in the Early Jurassic.
    Operations and results
    Appraisal well 34/10-8 was spudded with the semi-submersible installation Deepsea Saga on 8 March and drilled to TD at 2214 m in the Early Jurassic Cook Formation. Some problems with lost circulation was encountered when circulating prior to cementing the 13 3/8" casing. Also the drill string became stuck during plug back operations at 2037 m and 9 days were lost when fishing for it. The well was drilled with Gel/spud mud down to 875 m and with gel/lignosulphonate from 875 m to TD.
    The Middle Jurassic Brent Group sandstones came in with Tarbert Formation on top at 1821 m and the Ness Formation at 1853 m. The Tarbert and Ness formations were hydrocarbon-bearing with a 151 m gross pay zone from1821 to 1972 m. The Early Jurassic sandstones of the Cook Formation were water saturated. Above the reservoir good oil shows were recorded on limestone from 1712 to 1745 m and on limestone/mudstone/siltstone from 1665 to 1705 m. Otherwise traces of oil shows were recorded above the reservoir up to a depth of 1220 m. No shows were recorded below the oil bearing reservoir.
    A total of 13 cores were taken from 1823 to 1976 m, with a total recovery of 140 m. The RFT tool was run in the Brent sand and good data was obtained from 1826 to 2006 m. Fifteen out of seventeen tests were successful. In the Ness zone a fluid sample was taken at 1950 m.
    The well was permanently abandoned on 25 May 1980 as an oil appraisal well.
    Testing
    The well was perforated and tested in the interval 1869 to 1873 m in the Brent Group, Ness Formation. The test produced 498 Sm3 oil and 33900 Sm3 gas /day. The GOR was 68 Sm3/Sm3, the oil gravity was 29.5 deg API, and the gas gravity was 0.622 (air = 1). After the flow test an injection test was performed, indicating a fracture pressure of ca 5500 psig.
  • 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]
    230.00
    2216.00
  • 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
    1823.0
    1828.5
    [m ]
    2
    1828.5
    1832.5
    [m ]
    3
    1839.0
    1851.5
    [m ]
    4
    1856.5
    1860.8
    [m ]
    5
    1861.5
    1869.0
    [m ]
    6
    1877.0
    1883.6
    [m ]
    7
    1885.0
    1898.5
    [m ]
    8
    1898.5
    1908.5
    [m ]
    9
    1908.5
    1925.0
    [m ]
    10
    1925.0
    1939.5
    [m ]
    11
    1939.5
    1956.0
    [m ]
    12
    1956.0
    1956.6
    [m ]
    13
    1964.0
    1975.8
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    123.8
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 1942-1944m
    Core photo at depth: 1939-1942m
    Core photo at depth: 1938-1939m
    Core photo at depth: 1935-1938m
    Core photo at depth: 1938-1939m
    1942-1944m
    1939-1942m
    1938-1939m
    1935-1938m
    1938-1939m
    Core photo at depth: 1933-1935m
    Core photo at depth: 1927-1930m
    Core photo at depth: 1925-1927m
    Core photo at depth: 1924-1925m
    Core photo at depth: 1922-1924m
    1933-1935m
    1927-1930m
    1925-1927m
    1924-1925m
    1922-1924m
    Core photo at depth: 1919-1922m
    Core photo at depth: 1916-1919m
    Core photo at depth: 1913-1916m
    Core photo at depth: 1911-1913m
    Core photo at depth: 1908-1911m
    1919-1922m
    1916-1919m
    1913-1916m
    1911-1913m
    1908-1911m
    Core photo at depth: 1906-1908m
    Core photo at depth: 1903-1906m
    Core photo at depth: 1901-1903m
    Core photo at depth: 1898-1901m
    Core photo at depth: 1895-1898m
    1906-1908m
    1903-1906m
    1901-1903m
    1898-1901m
    1895-1898m
    Core photo at depth: 1893-1895m
    Core photo at depth: 1890-1893m
    Core photo at depth: 1887-1890m
    Core photo at depth: 1885-1887m
    Core photo at depth: 1882-1883m
    1893-1895m
    1890-1893m
    1887-1890m
    1885-1887m
    1882-1883m
    Core photo at depth: 1879-1882m
    Core photo at depth: 1877-1879m
    Core photo at depth: 1866-1869m
    Core photo at depth: 1864-1866m
    Core photo at depth: 1861-1864m
    1879-1882m
    1877-1879m
    1866-1869m
    1864-1866m
    1861-1864m
    Core photo at depth: 1859-1860m
    Core photo at depth: 1856-1859m
    Core photo at depth: 1849-1851m
    Core photo at depth: 1847-1849m
    Core photo at depth: 1844-1847m
    1859-1860m
    1856-1859m
    1849-1851m
    1847-1849m
    1844-1847m
    Core photo at depth: 1841-1844m
    Core photo at depth: 1839-1841m
    Core photo at depth: 1831-1832m
    Core photo at depth: 1828-1831m
    Core photo at depth: 1828-1828m
    1841-1844m
    1839-1841m
    1831-1832m
    1828-1831m
    1828-1828m
    Core photo at depth: 1825-1828m
    Core photo at depth: 1823-1825m
    Core photo at depth: 1947-1950m
    Core photo at depth: 1944-1947m
    Core photo at depth: 1947-1950m
    1825-1828m
    1823-1825m
    1947-1950m
    1944-1947m
    1947-1950m
    Core photo at depth: 1953-1955m
    Core photo at depth: 1955-1956m
    Core photo at depth: 1956-1956m
    Core photo at depth: 1966-1969m
    Core photo at depth: 1964-1966m
    1953-1955m
    1955-1956m
    1956-1956m
    1966-1969m
    1964-1966m
    Core photo at depth: 1972-1974m
    Core photo at depth: 1969-1972m
    Core photo at depth: 1974-1976m
    Core photo at depth:  
    Core photo at depth:  
    1972-1974m
    1969-1972m
    1974-1976m
  • Oil samples at the Norwegian Offshore Directorate

    Oil samples at the Norwegian Offshore Directorate
    Test type
    Bottle number
    Top depth
    MD [m]
    Bottom depth
    MD [m]
    Fluid type
    Test time
    Samples available
    DST
    DST 1
    1845.00
    1848.00
    17.05.1980 - 00:00
    YES
  • Lithostratigraphy

  • Documents – reported by the production licence (period for duty of secrecy expired)

  • Drill stem tests (DST)

    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    1845
    1848
    12.7
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    Drill stem tests (DST)
    Test number
    Oil
    [Sm3/day]
    Gas
    [Sm3/day]
    Oil density
    [g/cm3]
    Gas grav. rel.air
    GOR
    [m3/m3]
    1.0
    501
    0.882
    117
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL
    600
    1727
    CBL VDL
    1582
    1877
    CST
    1748
    2210
    DLL MSFL GR
    1800
    2017
    FDC CAL GR
    858
    1483
    FDC CNL GR
    1470
    1744
    HDT
    1732
    2216
    ISF SON GR SP
    216
    2216
  • 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
    216.0
    36
    216.0
    0.00
    LOT
    SURF.COND.
    20
    858.0
    26
    875.0
    1.63
    LOT
    INTERM.
    13 3/8
    1470.0
    17 1/2
    1483.0
    1.75
    LOT
    INTERM.
    9 5/8
    1735.0
    12 1/4
    1745.0
    1.90
    LOT
    LINER
    7
    1917.0
    8 1/2
    2216.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    200
    1.08
    90.0
    waterbased
    755
    1.09
    45.0
    waterbased
    825
    1.10
    39.0
    waterbased
    1025
    1.08
    44.0
    waterbased
    1350
    1.26
    44.0
    waterbased
    1550
    1.65
    46.0
    waterbased
    1610
    1.72
    48.0
    waterbased
    1735
    1.80
    53.0
    waterbased
  • Thin sections at the Norwegian Offshore Directorate

    Thin sections at the Norwegian Offshore Directorate
    Depth
    Unit
    1840.00
    [m ]
    1828.00
    [m ]
    1842.00
    [m ]
  • 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
    0.21