Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
sodir.no          Norsk
21.04.2024 - 01:32
Time of last synchronization with Norwegian Offshore Directorate's internal systems

25/11-15

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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.
    25/11-15
    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
    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.
    25/11-15
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    EU90-161& SP. 142/EB88-115& SP. 2526
    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.
    704-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.
    46
    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,
    10.11.1991
    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.
    25.12.1991
    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.
    25.12.1993
    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.
    20.06.2011
    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.
    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.
    YES
    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.
    PALEOCENE
    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.
    HEIMDAL FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    24.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    127.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2035.0
    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).
    2035.0
    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.
    85
    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.
    STATFJORD GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 11' 3.5'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 29' 3.82'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6560840.35
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    470534.45
    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.
    1872
  • Wellbore history

    General
    Well 25/11-15 was drilled east of the Balder Field complex on the Utsira High in the North Sea. The main objective was to test the hydrocarbon potential of the Paleocene Heimdal Sand in the Hermod prospect.
    Operations and results
    Wildcat well 25/11-15 was spudded with the semi-submersible installation Transocean 8 on 10 November 1991 and drilled to TD at 2035 m in the Early Jurassic Statfjord Formation. Due to shallow gas warning an 8 1/2" pilot was drilled from 239 to 390 m. No shallow gas was found. The well was drilled with seawater and viscous bentonite sweeps down to 1312 m and with KCl/PHPA/Polymer mud from 1312 m to TD.
    The Balder Formation was encountered at 1660 m. It contained rare sandstone stringers close to the top and these had good oil shows. This was the only oil show recorded outside of the Heimdal Formation. A 64 m thick Heimdal Formation Sandstone was penetrated from 1734 m to 1798 m. The sandstone was oil bearing down to a well-defined OWC at 1787 m. The net pay thickness was 51.88 m with an average porosity of 34.5% and an average Sw of 12.5%.
    Seven cores were cut from 1680 m to 1799 m, starting 7 m below the top Sele Formation and ending 1 m below the base of the Heimdal Formation. A total of 20 good RFT pressure points were recorded giving a fluid density of 0.86 g/cc in the hydrocarbon bearing zone. Two fluid samples were attempted, but were abandoned after problems with sand plugging.
    The well was permanently abandoned on 25 December 1991 as an oil Discovery.
    Testing
    A single production test was performed over the interval 1736 - 1775 m in the Heimdal Formation. The well flowed 525 Sm3 oil and 7500 Sm3 gas /day through a 25.4 mm choke. The GOR was 14 Sm3/Sm3 and the oil was 0.940 g/cm3. The gas gravity was 0.640 with 0.3% CO2 and 0.2 ppm H2S. The bottom hole temperature, recorded at 1695.08 m gauge depth, was 76.6 deg C.
  • 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]
    1320.00
    2035.00
  • 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
    1680.0
    1696.0
    [m ]
    2
    1696.8
    1705.8
    [m ]
    3
    1708.0
    1728.0
    [m ]
    4
    1728.0
    1740.0
    [m ]
    5
    1740.5
    1762.6
    [m ]
    6
    1762.6
    1781.1
    [m ]
    7
    1781.1
    1796.6
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    113.1
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 1680-1785m
    Core photo at depth: 1685-1689m
    Core photo at depth: 1689-1694m
    Core photo at depth: 1694-1699m
    Core photo at depth: 1699-1704m
    1680-1785m
    1685-1689m
    1689-1694m
    1694-1699m
    1699-1704m
    Core photo at depth: 1699-1704m
    Core photo at depth: 1704-1705m
    Core photo at depth: 1708-1713m
    Core photo at depth: 1713-1718m
    Core photo at depth: 1718-1723m
    1699-1704m
    1704-1705m
    1708-1713m
    1713-1718m
    1718-1723m
    Core photo at depth: 1723-1728m
    Core photo at depth: 1728-1733m
    Core photo at depth: 1733-1738m
    Core photo at depth: 1738-1745m
    Core photo at depth: 1745-1750m
    1723-1728m
    1728-1733m
    1733-1738m
    1738-1745m
    1745-1750m
    Core photo at depth: 1750-1754m
    Core photo at depth: 1754-1759m
    Core photo at depth: 1759-1764m
    Core photo at depth: 1764-1769m
    Core photo at depth: 1769-1774m
    1750-1754m
    1754-1759m
    1759-1764m
    1764-1769m
    1769-1774m
    Core photo at depth: 1774-1779m
    Core photo at depth: 1779-1784m
    Core photo at depth: 1784-1789m
    Core photo at depth: 1789-1794m
    Core photo at depth: 1794-1796m
    1774-1779m
    1779-1784m
    1784-1789m
    1789-1794m
    1794-1796m
  • Palynological slides at the Norwegian Offshore Directorate

    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1325.0
    [m]
    SWC
    HYDRO
    1350.0
    [m]
    SWC
    HYDRO
    1375.0
    [m]
    SWC
    HYDRO
    1425.0
    [m]
    SWC
    HYDRO
    1460.0
    [m]
    SWC
    HYDRO
    1485.0
    [m]
    SWC
    HYDRO
    1495.0
    [m]
    SWC
    HYDRO
    1497.0
    [m]
    SWC
    HYDRO
    1570.0
    [m]
    SWC
    HYDRO
    1605.0
    [m]
    SWC
    HYDRO
    1617.0
    [m]
    SWC
    HYDRO
    1640.0
    [m]
    SWC
    HYDRO
    1652.0
    [m]
    SWC
    HYDRO
    1675.0
    [m]
    SWC
    HYDRO
    1678.0
    [m]
    SWC
    HYDRO
    1680.0
    [m]
    C
    HYDRO
    1684.0
    [m]
    C
    HYDRO
    1689.0
    [m]
    C
    HYDRO
    1694.0
    [m]
    C
    HYDRO
    1696.9
    [m]
    C
    HYDRO
    1703.0
    [m]
    C
    HYDRO
    1707.0
    [m]
    SWC
    HYDRO
    1708.2
    [m]
    C
    HYDRO
    1713.0
    [m]
    C
    HYDRO
    1717.0
    [m]
    C
    HYDRO
    1722.0
    [m]
    C
    HYDRO
    1726.4
    [m]
    C
    HYDRO
    1730.9
    [m]
    C
    OD
    1732.0
    [m]
    C
    HYDRO
    1732.8
    [m]
    C
    OD
    1735.6
    [m]
    C
    HYDRO
    1741.2
    [m]
    C
    HYDRO
    1749.0
    [m]
    C
    HYDRO
    1756.0
    [m]
    C
    HYDRO
    1764.0
    [m]
    C
    HYDRO
    1770.5
    [m]
    C
    HYDRO
    1777.5
    [m]
    C
    HYDRO
    1784.9
    [m]
    C
    HYDRO
    1784.9
    [m]
    C
    OD
    1791.4
    [m]
    C
    HYDRO
    1792.8
    [m]
    C
    HYDRO
    1796.0
    [m]
    C
    HYDRO
    1815.0
    [m]
    SWC
    HYDRO
    1850.0
    [m]
    SWC
    HYDRO
    1952.0
    [m]
    SWC
    HYDRO
    1964.0
    [m]
    SWC
    HYDRO
    1988.0
    [m]
    SWC
    HYDRO
    1989.3
    [m]
    SWC
    HYDRO
    1990.8
    [m]
    SWC
    HYDRO
  • 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
    DST1
    1736.00
    1775.00
    18.12.1991 - 00:00
    YES
  • Lithostratigraphy

  • Geochemical information

    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.16
    pdf
    1.23
    pdf
    0.46
  • 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
    17.18
  • Drill stem tests (DST)

    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    1736
    1774
    25.4
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    76
    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
    525
    7500
    0.940
    0.640
    14
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CST
    1290
    2006
    DIL LSS GR SP AMS
    238
    1259
    DIL LSS GR SP AMS
    1274
    2018
    DLL MSFL LDL CNL NGL SP AMS
    1274
    2016
    MWD - GR RES DIR
    150
    2035
    RFT GR AMS
    1485
    1504
    RFT GR AMS
    1661
    1997
    RFT GR AMS
    1735
    1736
    SHDT GR AMS
    1274
    2021
    VSP
    570
    2010
  • 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
    237.0
    36
    240.0
    0.00
    LOT
    INTERM.
    9 5/8
    1273.0
    12 1/4
    1275.0
    1.71
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    238
    1.20
    19.0
    8.0
    WATER BASED
    12.11.1991
    239
    1.20
    19.0
    8.0
    WATER BASED
    12.11.1991
    450
    1.20
    18.0
    4.0
    WATER BASED
    13.11.1991
    1312
    1.20
    18.0
    9.0
    WATER BASED
    14.11.1991
    1312
    1.22
    19.0
    15.0
    WATER BASED
    19.11.1991
    1312
    1.20
    19.0
    11.0
    WATER BASED
    19.11.1991
    1312
    1.20
    18.0
    8.0
    WATER BASED
    15.11.1991
    1530
    1.13
    20.0
    14.0
    WATER BASED
    19.11.1991
    1697
    1.15
    17.0
    8.0
    WATER BASED
    19.11.1991
    1726
    1.16
    16.0
    9.0
    WATER BASED
    20.11.1991
    1726
    1.16
    16.0
    9.0
    WATER BASED
    22.11.1991
    1768
    1.19
    15.0
    9.0
    WATER BASED
    28.11.1991
    1769
    1.20
    14.0
    11.0
    WATER BASED
    29.11.1991
    1769
    1.20
    14.0
    12.0
    WATER BASED
    02.12.1991
    1769
    1.35
    20.0
    14.0
    WATER BASED
    02.12.1991
    1769
    1.29
    15.0
    9.0
    WATER BASED
    02.12.1991
    1769
    1.29
    15.0
    10.0
    WATER BASED
    03.12.1991
    1769
    1.29
    15.0
    9.0
    WATER BASED
    04.12.1991
    1769
    1.21
    13.0
    7.0
    WATER BASED
    05.12.1991
    1776
    1.26
    17.0
    16.0
    WATER BASED
    06.12.1991
    1776
    1.27
    19.0
    14.0
    WATER BASED
    10.12.1991
    1776
    1.27
    18.0
    13.0
    WATER BASED
    10.12.1991
    1776
    1.27
    18.0
    14.0
    WATER BASED
    11.12.1991
    1776
    1.26
    14.0
    13.0
    WATER BASED
    11.12.1991
    1776
    1.26
    14.0
    13.0
    WATER BASED
    13.12.1991
    1776
    1.26
    14.0
    13.0
    WATER BASED
    16.12.1991
    1776
    1.26
    14.0
    13.0
    WATER BASED
    16.12.1991
    1776
    1.26
    14.0
    13.0
    WATER BASED
    17.12.1991
    1776
    1.26
    14.0
    13.0
    WATER BASED
    18.12.1991
    1776
    1.25
    14.0
    13.0
    WATER BASED
    19.12.1991
    1776
    1.25
    14.0
    13.0
    WATER BASED
    20.12.1991
    1776
    1.25
    12.0
    10.0
    WATER BASED
    23.12.1991
    1776
    1.28
    19.0
    15.0
    WATER BASED
    10.12.1991
    1776
    1.26
    14.0
    13.0
    WATER BASED
    12.12.1991
    1776
    1.26
    14.0
    13.0
    WATER BASED
    16.12.1991
    1781
    1.15
    16.0
    9.0
    WATER BASED
    22.11.1991
    1781
    1.15
    16.0
    9.0
    WATER BASED
    21.11.1991
    1906
    1.18
    18.0
    11.0
    WATER BASED
    22.11.1991
    2035
    1.18
    16.0
    10.0
    WATER BASED
    25.11.1991
    2035
    1.18
    16.0
    9.0
    WATER BASED
    27.11.1991
    2035
    1.16
    17.0
    10.0
    WATER BASED
    25.11.1991
    2035
    1.17
    14.0
    8.0
    WATER BASED
    25.11.1991
    2035
    1.18
    17.0
    10.0
    WATER BASED
    26.11.1991
  • 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
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