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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31/2-16 S

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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.
    31/2-16 S
    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.
    31/2-16
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    NH 8901 - 1145 SP. 336
    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.
    622-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.
    92
    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,
    27.09.1989
    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.
    27.12.1989
    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.
    27.12.1991
    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.
    18.12.2008
    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.
    23.0
    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).
    2390.0
    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).
    1587.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    92.8
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    40
    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.
    LATE 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.
    SOGNEFJORD FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 46' 0.2'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 25' 26.9'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6737038.10
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    523108.99
    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.
    1453

  • Wellbore history
    General
    Well 31/2-16 S was drilled as an appraisal in the Troll-West Oil province in the Northern North Sea. It was located on the crestal part of the Oil Province close to well 31/2-5. The primary objective was to drill hole and prepare for a long term production from a horizontal well drilled 5 m above the oil/water contact in the 23.5 m thick oil column. The length of the horizontal section should preferably be 500 m.
    Operations and results
    Appraisal well 31/2-16 S was spudded with the semi-submersible installation Deepsea Bergen on 27 September 1989 and drilled to TD at 2390 m ( 1587 m TVD RKB) in the Late Jurassic Sognefjord Formation. The well was drilled vertical down to 1118 m in the 17 1/2" section and kicked of from there, building angle up to a horizontal well path from ca 1950 m. Problems with tight hole, lost circulation and hard formation (stringers) were encountered repeatedly in the 17 1/2 and 12 1/4" sections from 1015 to 1891 m. The well was drilled with sea water and hi-vis pills down to 1015 m and with Versaport oil based mud from 1015 m to 1891 m, and with a super-saturated NaCl / polymer mud from 1891 m to TD. During well completion and preparation for production testing the screen-packer stuck at 570 m. Close to eight days were lost in milling and retrieving the fish before normal operations could be resumed.
    The Sognefjord Formation was encountered at 1659 m (1533 m TVD RKB). The established gas/oil contact in the Troll Field is at 1547 m MSL TVD, which is 1.5 m deeper than observed in this well. This 1.5 m is within the uncertainty of the TVD calculations, and a common gas/oil contact is assumed.
    No conventional or side wall cores were cut. No wire line pressure tests or fluid samples were taken. Apart from runs 1A, wire line logging was performed by the use of pipe conveyed Logging Systems. MWD was the only deep resistivity measuring device through the whole well.
    After drilling to TD the well was completed with 502 m 6 5/8" prepacked screens in the Sognefjord Formation reservoir, from 2390 to 1888 m (1587 - 1586 m RKB TVD). The well was completed on 27 December 1989 as an oil and gas appraisal. It was subsequently reclassified to test production well 31/2-T-16 S. After the test production it was again re-classified to development well 31/2-F-5 H.
    Testing
    A clean-up flow was conducted as part of the 31/2-16 S well completion. During this flow one bottom hole fluid sample and three separator PVT-sets (1 x oil/2 x gas) samples were taken.

  • 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]
    1030.00
    1890.00

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    377
    782
    1358
    1358
    1413
    1453
    1645
    1650
    1659
    1659

  • 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
    17.08

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    1888
    2384
    50.8
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    4.000
    14.700
    67
    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
    1990
    89444
    0.882
    0.638

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL CDL GR CCL
    354
    1604
    CBL VDL GR CCL - MISRUN
    1404
    1885
    CDL CN GR
    1599
    1795
    CDL CN GR - MISRUN
    1566
    1900
    GYRO
    1465
    1880
    GYRO
    1470
    1880
    GYRO CCL
    354
    1590
    MLL CDL CN GR
    1885
    2390
    MWD - GR CDR CDN DIR
    1888
    1969
    MWD - GR CDR DIR
    1020
    1905
    MWD - GR CDR DIR
    1888
    2390
    MWD - GR RES SN DIR
    354
    1020
    PLS
    1850
    2345

  • 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
    439.0
    36
    439.0
    0.00
    LOT
    INTERM.
    20
    1003.0
    26
    1020.0
    1.79
    LOT
    INTERM.
    13 3/8
    1601.0
    17 1/2
    1607.0
    1.45
    LOT
    INTERM.
    9 5/8
    1888.0
    12 1/4
    1891.0
    0.00
    LOT
    LINER
    7
    2390.0
    8 1/2
    2390.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    439
    1.05
    WATER BASED
    29.09.1989
    623
    1.25
    11.0
    6.0
    WATER BASED
    08.07.1991
    1020
    1.34
    54.0
    15.0
    OIL BASED
    09.10.1989
    1020
    0.00
    WATER BASED
    03.10.1989
    1020
    0.00
    WATER BASED
    05.10.1989
    1020
    1.34
    52.0
    15.0
    OIL BASED
    06.10.1989
    1020
    1.34
    51.0
    15.0
    OIL BASED
    09.10.1989
    1023
    1.36
    53.0
    14.0
    OIL BASED
    09.10.1989
    1315
    1.41
    47.0
    11.0
    OIL BASED
    10.10.1989
    1315
    1.41
    44.0
    11.0
    OIL BASED
    12.10.1989
    1315
    1.41
    46.0
    11.0
    OIL BASED
    11.10.1989
    1321
    1.40
    42.0
    10.0
    OIL BASED
    13.10.1989
    1370
    1.41
    46.0
    11.0
    OIL BASED
    16.10.1989
    1370
    1.41
    50.0
    11.0
    OIL BASED
    16.10.1989
    1375
    1.39
    36.0
    9.0
    OIL BASED
    16.10.1989
    1398
    1.39
    35.0
    8.0
    OIL BASED
    18.10.1989
    1403
    1.35
    31.0
    8.0
    OIL BASED
    18.10.1989
    1513
    1.35
    44.0
    13.0
    OIL BASED
    19.10.1989
    1607
    1.35
    48.0
    14.0
    OIL BASED
    23.10.1989
    1607
    1.35
    37.0
    9.0
    OIL BASED
    23.10.1989
    1607
    1.35
    48.0
    14.0
    OIL BASED
    23.10.1989
    1607
    1.35
    37.0
    9.0
    OIL BASED
    23.10.1989
    1607
    1.25
    26.0
    4.0
    OIL BASED
    24.10.1989
    1607
    1.35
    38.0
    9.0
    OIL BASED
    23.10.1989
    1607
    1.35
    38.0
    9.0
    OIL BASED
    23.10.1989
    1610
    1.26
    31.0
    7.0
    OIL BASED
    25.10.1989
    1679
    1.25
    33.0
    6.0
    OIL BASED
    27.10.1989
    1743
    1.26
    39.0
    8.0
    OIL BASED
    27.10.1989
    1774
    1.27
    36.0
    9.0
    OIL BASED
    30.10.1989
    1802
    1.26
    33.0
    8.0
    OIL BASED
    30.10.1989
    1804
    1.26
    31.0
    7.0
    OIL BASED
    30.10.1989
    1861
    1.25
    12.0
    9.0
    WATER BASED
    09.11.1989
    1873
    1.26
    33.0
    7.0
    OIL BASED
    31.10.1989
    1890
    1.23
    14.0
    11.0
    WATER BASED
    06.11.1989
    1890
    1.24
    13.0
    11.0
    WATER BASED
    07.11.1989
    1891
    1.27
    31.0
    7.0
    OIL BASED
    01.11.1989
    1891
    1.27
    34.0
    7.0
    OIL BASED
    02.11.1989
    1891
    1.27
    34.0
    7.0
    OIL BASED
    03.11.1989
    1891
    1.27
    34.0
    7.0
    OIL BASED
    06.11.1989
    1891
    1.23
    14.0
    11.0
    WATER BASED
    06.11.1989
    1905
    1.24
    13.0
    13.0
    WATER BASED
    09.11.1989
    1905
    1.25
    13.0
    12.0
    WATER BASED
    13.11.1989
    1905
    1.25
    13.0
    12.0
    WATER BASED
    13.11.1989
    1905
    1.25
    13.0
    11.0
    WATER BASED
    10.11.1989
    1905
    1.25
    13.0
    13.0
    WATER BASED
    13.11.1989
    2000
    1.25
    13.0
    13.0
    WATER BASED
    14.11.1989
    2033
    1.26
    14.0
    12.0
    WATER BASED
    15.11.1989
    2056
    1.25
    14.0
    12.0
    WATER BASED
    16.11.1989
    2183
    1.25
    13.0
    12.0
    WATER BASED
    17.11.1989
    2317
    1.26
    15.0
    13.0
    WATER BASED
    20.11.1989
    2390
    1.25
    14.0
    16.0
    WATER BASED
    27.11.1989
    2390
    1.15
    11.0
    6.0
    WATER BASED
    04.12.1989
    2390
    1.15
    11.0
    6.0
    WATER BASED
    11.12.1989
    2390
    1.05
    11.0
    6.0
    WATER BASED
    20.12.1989
    2390
    1.05
    11.0
    6.0
    WATER BASED
    21.12.1989
    2390
    1.05
    11.0
    6.0
    WATER BASED
    22.12.1989
    2390
    1.25
    12.0
    8.0
    WATER BASED
    01.07.1991
    2390
    1.25
    12.0
    8.0
    WATER BASED
    01.07.1991
    2390
    1.25
    9.0
    6.0
    WATER BASED
    01.07.1991
    2390
    1.25
    11.0
    7.0
    WATER BASED
    05.07.1991
    2390
    1.26
    9.0
    5.0
    WATER BASED
    08.07.1991
    2390
    1.26
    15.0
    14.0
    WATER BASED
    20.11.1989
    2390
    1.25
    10.0
    6.0
    WATER BASED
    20.11.1989
    2390
    1.25
    12.0
    7.0
    WATER BASED
    21.11.1989
    2390
    1.25
    12.0
    7.0
    WATER BASED
    22.11.1989
    2390
    1.25
    16.0
    18.0
    WATER BASED
    23.11.1989
    2390
    1.25
    16.0
    18.0
    WATER BASED
    24.11.1989
    2390
    1.25
    15.0
    16.0
    WATER BASED
    27.11.1989
    2390
    1.25
    14.0
    16.0
    WATER BASED
    27.11.1989
    2390
    1.25
    10.0
    8.0
    WATER BASED
    28.11.1989
    2390
    1.25
    13.0
    12.0
    WATER BASED
    29.11.1989
    2390
    1.25
    11.0
    7.0
    WATER BASED
    30.11.1989
    2390
    1.25
    11.0
    6.0
    WATER BASED
    01.12.1989
    2390
    1.25
    11.0
    6.0
    WATER BASED
    04.12.1989
    2390
    1.15
    11.0
    6.0
    WATER BASED
    04.12.1989
    2390
    1.05
    11.0
    6.0
    WATER BASED
    11.12.1989
    2390
    1.05
    11.0
    6.0
    WATER BASED
    11.12.1989
    2390
    1.15
    11.0
    6.0
    WATER BASED
    13.12.1989
    2390
    1.05
    11.0
    6.0
    WATER BASED
    13.12.1989
    2390
    1.05
    11.0
    6.0
    WATER BASED
    14.12.1989
    2930
    1.05
    11.0
    6.0
    WATER BASED
    15.12.1989
    2930
    1.05
    11.0
    6.0
    WATER BASED
    18.12.1989
    2930
    1.05
    11.0
    6.0
    WATER BASED
    18.12.1989
    2930
    1.05
    11.0
    6.0
    WATER BASED
    18.12.1989
    2930
    1.05
    11.0
    6.0
    WATER BASED
    19.12.1989