Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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19.06.2024 - 01:33
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31/5-5

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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.
    31/5-5
    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.
    SUSPENDED
    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.
    31/5-5
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    NH 9101- ROW 694& COLUMN 542
    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.
    751-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.
    44
    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,
    30.12.1992
    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.
    11.02.1993
    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.
    11.02.1995
    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.
    29.06.2004
    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.
    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/GAS
    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.
    LATE 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.
    SOGNEFJORD FM
    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.
    319.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    1930.0
    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).
    1930.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    1.2
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    60
    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.
    MIDDLE 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.
    KROSSFJORD FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 41' 49.66'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 29' 8.74'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6729309.74
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    526523.74
    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.
    2059
  • Wellbore history

    General
    The well was drilled as part of the appraisal programme initiated for the southern part of the Troll West Gas province (TWGP-S). The objectives of the well were to provide geological, geophysical and petrophysical data for evaluation of the potential for a group of oil producers in TWGP-S; and to provide data on the Fensfjord and Krossfjord Formations to improve aquifer modelling. The well was further planned for later re-entry, either for sidetracking and completion as a horizontal producer, or for vertical recompletion for Sognefjord Formation reservoir monitoring.
    Operations and results
    Well 31/5-5 was spudded with the semi-submersible installation West Delta on 30 December 1992 and drilled to a total depth at 1930 m in the Middle Jurassic Krossfjord Formation. The well was drilled with spud mud to 940 m and with KCl/brine from 940 m to TD.
    The Sognefjord Formation was encountered from 1572 m to 1725 m, and was hydrocarbon bearing. Strong oil shows were recorded from 1573 m to1587.5 m, weaker oil shows were recorded below this depth down to 1650 m. The gas-oil contact was identified at 1573.5, and the oil-water contact was identified at 1585.5 m. From FMT pressure tests a gas gradient of 0.152 g/cc, an oil gradient of 0.825 g/cc, and a water gradient of 1.02 g/cc was defined. Twelve conventional cores were cut. The first ten were from 1555 m in the top of the Sognefjord Formation to1726 m, one meter into the Fensfjord Formation. Cores 11 and 12 were cut from 1835 m in the Fensfjord Formation to 1888 m in the Krossfjord Formation. FMT fluid samples were taken at 1583 m (two samples, both contained oil and gas), 1576.5 m (oil and gas), and at 1571 m (gas).
    The well was temporarily plugged at 1450 m and 450 m using two 9 5/8" Baker type N1 bridge plugs and suspended as an oil and gas appraisal well on 11 February 1993.
    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]
    950.00
    1930.00
  • 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
    1555.0
    1571.5
    [m ]
    2
    1571.5
    1583.0
    [m ]
    3
    1585.5
    1601.0
    [m ]
    4
    1603.5
    1622.0
    [m ]
    5
    1622.7
    1640.0
    [m ]
    6
    1640.0
    1658.0
    [m ]
    7
    1658.0
    1674.7
    [m ]
    8
    1675.0
    1693.0
    [m ]
    9
    1693.0
    1710.5
    [m ]
    10
    1710.5
    1736.0
    [m ]
    11
    1835.0
    1860.0
    [m ]
    12
    1861.0
    1888.9
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    227.9
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 1555-1560m
    Core photo at depth: 1560-1565m
    Core photo at depth: 1565-1570m
    Core photo at depth: 1570-1571m
    Core photo at depth: 1571-1576m
    1555-1560m
    1560-1565m
    1565-1570m
    1570-1571m
    1571-1576m
    Core photo at depth: 1576-1581m
    Core photo at depth: 1581-1583m
    Core photo at depth: 1585-1590m
    Core photo at depth: 1590-1595m
    Core photo at depth: 1595-1600m
    1576-1581m
    1581-1583m
    1585-1590m
    1590-1595m
    1595-1600m
    Core photo at depth: 1600-1602m
    Core photo at depth: 1603-1608m
    Core photo at depth: 1608-1613m
    Core photo at depth: 1613-1618m
    Core photo at depth: 1618-1622m
    1600-1602m
    1603-1608m
    1608-1613m
    1613-1618m
    1618-1622m
    Core photo at depth: 1622-1627m
    Core photo at depth: 1627-1632m
    Core photo at depth: 1632-1637m
    Core photo at depth: 1637-1640m
    Core photo at depth: 1640-1645m
    1622-1627m
    1627-1632m
    1632-1637m
    1637-1640m
    1640-1645m
    Core photo at depth: 1645-1650m
    Core photo at depth: 1650-1655m
    Core photo at depth: 1655-1658m
    Core photo at depth: 1658-1663m
    Core photo at depth: 1663-1668m
    1645-1650m
    1650-1655m
    1655-1658m
    1658-1663m
    1663-1668m
    Core photo at depth: 1668-1673m
    Core photo at depth: 1673-1674m
    Core photo at depth: 1675-1680m
    Core photo at depth: 1680-1685m
    Core photo at depth: 1685-1690m
    1668-1673m
    1673-1674m
    1675-1680m
    1680-1685m
    1685-1690m
    Core photo at depth: 1690-1693m
    Core photo at depth: 1693-1698m
    Core photo at depth: 1698-1703m
    Core photo at depth: 1703-1708m
    Core photo at depth: 1708-1710m
    1690-1693m
    1693-1698m
    1698-1703m
    1703-1708m
    1708-1710m
    Core photo at depth: 1710-1715m
    Core photo at depth: 1715-1720m
    Core photo at depth: 1720-1725m
    Core photo at depth: 1725-1730m
    Core photo at depth: 1730-1735m
    1710-1715m
    1715-1720m
    1720-1725m
    1725-1730m
    1730-1735m
    Core photo at depth: 1735-1736m
    Core photo at depth: 1835-1840m
    Core photo at depth: 1840-1845m
    Core photo at depth: 1845-1850m
    Core photo at depth: 1850-1855m
    1735-1736m
    1835-1840m
    1840-1845m
    1845-1850m
    1850-1855m
    Core photo at depth: 1855-1860m
    Core photo at depth: 1860-1861m
    Core photo at depth: 1861-1866m
    Core photo at depth: 1866-1871m
    Core photo at depth: 1871-1876m
    1855-1860m
    1860-1861m
    1861-1866m
    1866-1871m
    1871-1876m
    Core photo at depth: 1876-1881m
    Core photo at depth: 1881-1886m
    Core photo at depth: 1886-1888m
    Core photo at depth:  
    Core photo at depth:  
    1876-1881m
    1881-1886m
    1886-1888m
  • Lithostratigraphy

  • Composite logs

    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.26
  • 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
    16.77
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    ACL SDL GR
    347
    910
    ACL SDL GR
    870
    1412
    ACL SDL GR
    1350
    1500
    CST GR
    1583
    1925
    DCBIL HDIP GR
    1537
    1923
    DLL MLL AC ZDL CN SP GR
    1461
    1927
    FMT VPC FQPG GR
    1537
    1923
    FMT VPC FQPG GR
    1572
    1572
    FMT VPC FQPG GR
    1577
    1577
    FMT VPC FQPG GR
    1583
    1583
    MAC SL
    1474
    1928
    MWD - GR DPR DIR
    1560
    1930
    MWD - GR RES DIR
    347
    1555
    VSP
    960
    1920
  • 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
    432.0
    36
    432.0
    0.00
    LOT
    INTERM.
    18 5/8
    926.0
    24
    940.0
    1.58
    LOT
    INTERM.
    9 5/8
    1515.0
    12 1/4
    1530.0
    1.54
    LOT
    OPEN HOLE
    1930.0
    8 1/2
    1930.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    400
    1.34
    7.0
    WATER BASED
    456
    1.34
    9.0
    WATER BASED
    940
    1.20
    WATER BASED
    1255
    1.34
    7.0
    WATER BASED
    1466
    1.34
    11.0
    WATER BASED
    1530
    1.34
    22.0
    WATER BASED
    1571
    1.17
    23.0
    WATER BASED
    1640
    1.17
    19.0
    WATER BASED
    1737
    1.17
    19.0
    WATER BASED
    1930
    1.17
    WATER BASED
  • 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
    0.17