Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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16.07.2024 - 01:28
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31/2-10

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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.
    31/2-10
    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.
    31/2-10
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    79-410 SP 668 AND 8007-328 SP 612
    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.
    A/S Norske Shell
    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.
    346-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.
    30
    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,
    02.10.1982
    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.
    31.10.1982
    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.
    31.10.1984
    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.
    19.12.2007
    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.
    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.
    331.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    1833.0
    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).
    1833.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    3.25
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    51
    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.
    FENSFJORD FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 47' 38.94'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 29' 39.46'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6740119.84
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    526908.33
    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.
    90
  • Wellbore history

    General
    Well 31/2-10 was drilled as an appraisal well in the Troll West oil province in the Northern North Sea. The main objectives were to define the top and intra reservoir markers in this area of the Troll West, establish the extent of the 27.5 m oil column in the area in which the GOC is at 1541 m sub-sea (1567 m RKB), and to determine the reserves potential in the structurally low area east-north of well 31/2-5 and south east of 31/2-7.
    Operations and results
    The site survey revealed, typical for the area, numerous pockmarks. These had a fairly random distribution of 15 to 20 per km2. Although the size of individual pockmarks varied, average sizes were between 30 and 40 m wide at the rim, and 3 to 4 m deep at the centre. At the location itself no pockmark was seen.
    Well 31/2-10 was spudded with the semi-submersible installation Borgny Dolphin on 2 October 1982 and drilled to TD at 1833 m, 40 m into in the Early Jurassic Fensfjord Formation. After drilling the 36" section, a 14 3/4" pilot hole was drilled to 810 m. The hole was then logged without indication of shallow gas before opening up to 26". One and a half days were lost during coring due to bad weather. The well was drilled with spud mud down to 472 m, with gel/seawater from 472 m to 810 m, with KCl/polymer mud from 810 m to 1530 m, and with seawater/Drispac from 130 m to TD.
    Top Jurassic was encountered with a 35 m thick Draupne shale. The Sognefjord Formation sands were encountered at 1600 m, below the prognosed OWC. The Heather Formation came in at 1733 m, and the Fensfjord Formation at 1793 m. From top Sognefjord Formation to 1647 m bleeding oil and oil stained grains were noted on the cores. However the petrophysical interpretation concluded the sands to be water bearing.
    Ten cores were taken in the interval 1575 m to 1741.5 m and 127.98 m (77%) was recovered. All cores were taken in fibreglass sleeves to achieve better recovery in the loose sands. One RFT run was made between 1601.5 and 1817.5 m and confirmed a water gradient. No wire line fluid samples were taken.
    The well was permanently abandoned on 31 October 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]
    510.00
    1831.00
  • 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
    1575.3
    1580.2
    [m ]
    2
    1585.0
    1592.5
    [m ]
    3
    1599.0
    1617.0
    [m ]
    4
    1617.5
    1634.4
    [m ]
    5
    1637.0
    1655.3
    [m ]
    6
    1655.5
    1674.0
    [m ]
    7
    1674.0
    1686.4
    [m ]
    8
    1692.0
    1704.4
    [m ]
    9
    1704.5
    1723.0
    [m ]
    10
    1723.0
    1741.5
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    145.7
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 1575-1580m
    Core photo at depth: 1580-1581m
    Core photo at depth: 1585-1590m
    Core photo at depth: 1590-1592m
    Core photo at depth: 1599-1604m
    1575-1580m
    1580-1581m
    1585-1590m
    1590-1592m
    1599-1604m
    Core photo at depth: 1604-1609m
    Core photo at depth: 1609-1615m
    Core photo at depth: 1615-1617m
    Core photo at depth: 1617-1622m
    Core photo at depth: 1622-1628m
    1604-1609m
    1609-1615m
    1615-1617m
    1617-1622m
    1622-1628m
    Core photo at depth: 1628-1633m
    Core photo at depth: 1633-1634m
    Core photo at depth: 1637-1642m
    Core photo at depth: 1642-1647m
    Core photo at depth: 1647-1653m
    1628-1633m
    1633-1634m
    1637-1642m
    1642-1647m
    1647-1653m
    Core photo at depth: 1653-1655m
    Core photo at depth: 1655-1660m
    Core photo at depth: 1660-1666m
    Core photo at depth: 1666-1671m
    Core photo at depth: 1671-1674m
    1653-1655m
    1655-1660m
    1660-1666m
    1666-1671m
    1671-1674m
    Core photo at depth: 1674-1679m
    Core photo at depth: 1679-1684m
    Core photo at depth: 1684-1687m
    Core photo at depth: 1692-1697m
    Core photo at depth: 1697-1703m
    1674-1679m
    1679-1684m
    1684-1687m
    1692-1697m
    1697-1703m
    Core photo at depth: 1703-1704m
    Core photo at depth: 1704-1709m
    Core photo at depth: 1709-1715m
    Core photo at depth: 1715-1720m
    Core photo at depth: 1720-1722m
    1703-1704m
    1704-1709m
    1709-1715m
    1715-1720m
    1720-1722m
    Core photo at depth: 1723-1728m
    Core photo at depth: 1728-1733m
    Core photo at depth: 1733-1739m
    Core photo at depth: 1739-1741m
    Core photo at depth:  
    1723-1728m
    1728-1733m
    1733-1739m
    1739-1741m
  • Palynological slides at the Norwegian Offshore Directorate

    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1565.0
    [m]
    SWC
    SHELL
    1569.0
    [m]
    SWC
    SHELL
    1571.6
    [m]
    SWC
    SHELL
    1576.7
    [m]
    C
    SHELL
    1585.0
    [m]
    C
    SHELL
    1591.0
    [m]
    C
    SHELL
    1591.4
    [m]
    C
    SHELL
    1601.5
    [m]
    SWC
    SHELL
    1608.0
    [m]
    C
    SHELL
    1610.7
    [m]
    C
    SHELL
    1611.9
    [m]
    C
    SHELL
    1613.4
    [m]
    C
    SHELL
    1617.5
    [m]
    C
    SHELL
    1630.8
    [m]
    C
    SHELL
    1632.6
    [m]
    C
    SHELL
    1640.7
    [m]
    C
    SHELL
    1646.2
    [m]
    C
    SHELL
    1648.9
    [m]
    C
    SHELL
    1655.3
    [m]
    C
    SHELL
    1659.0
    [m]
    C
    SHELL
    1684.6
    [m]
    C
    SHELL
    1693.8
    [m]
    C
    SHELL
    1694.7
    [m]
    C
    SHELL
    1697.2
    [m]
    C
    SHELL
    1702.0
    [m]
    C
    SHELL
    1704.3
    [m]
    C
    SHELL
    1724.8
    [m]
    C
    SHELL
    1732.7
    [m]
    C
    SHELL
    1741.5
    [m]
    C
    SHELL
    1746.0
    [m]
    SWC
    SHELL
    1755.8
    [m]
    SWC
    SHELL
    1762.0
    [m]
    SWC
    SHELL
    1769.4
    [m]
    SWC
    SHELL
    1775.0
    [m]
    SWC
    SHELL
    1782.0
    [m]
    SWC
    SHELL
    1786.4
    [m]
    SWC
    SHELL
    1792.7
    [m]
    SWC
    SHELL
    1795.5
    [m]
    SWC
    SHELL
    1803.5
    [m]
    SWC
    SHELL
    1808.2
    [m]
    SWC
    SHELL
    1820.3
    [m]
    SWC
    SHELL
  • Lithostratigraphy

  • Geochemical information

    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.39
    pdf
    0.50
    pdf
    0.34
  • Documents – reported by the production licence (period for duty of secrecy expired)

  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL
    500
    1515
    CST
    794
    1520
    CST
    1520
    1820
    DLL MSFL GR CAL
    1515
    1824
    HDT
    1515
    1833
    ISF BHC GR
    350
    810
    ISF BHC GR
    794
    1526
    ISF BHC GR
    1515
    1831
    LDT CNL GR
    794
    1528
    LDT CNL GR CAL
    455
    811
    LDT CNL NGT CAL
    1515
    1833
    RFT
    0
    0
    WST
    550
    1820
  • 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
    454.0
    36
    472.0
    0.00
    LOT
    SURF.COND.
    20
    793.0
    26
    810.0
    1.51
    LOT
    INTERM.
    13 3/8
    1514.0
    17 1/2
    1530.0
    1.59
    LOT
    OPEN HOLE
    1575.0
    12 1/4
    1575.0
    0.00
    LOT
    OPEN HOLE
    1833.0
    8 1/2
    1833.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    490
    1.05
    waterbased
    790
    1.07
    waterbased
    900
    1.18
    waterbased
    1250
    1.30
    waterbased
    1350
    1.35
    waterbased
    1500
    1.35
    waterbased
    1833
    1.18
    waterbased
  • 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
    0.19