Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
sodir.no    Norsk
sodir.no          Norsk
29.04.2024 - 01:33
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31/2-15

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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.
    31/2-15
    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).
    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.
    31/2-15
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    8007 - 154 SP. 290
    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.
    434-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.
    67
    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,
    10.09.1984
    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.
    15.11.1984
    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.
    15.11.1986
    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.
    06.06.2006
    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.
    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.
    NO FORMAL NAME
    2nd level with HC, age
    Age of lithostratigraphic unit, 2nd level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE.
    LATE JURASSIC
    2nd level with HC, formation
    Name of lithostartigraphic unit, 2nd 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.
    SOGNEFJORD FM
    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.
    343.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    1677.0
    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).
    1677.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    3.5
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    37
    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° 55' 25.45'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 34' 2.57'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6754585.85
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    530762.08
    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.
    439

  • Wellbore history
    General
    Well 31/2-15 was drilled in the northern part of the Troll West oil and gas province to evaluate reservoir quality and development in the northern part of the Troll West accumulation, and to establish fluid contacts in an undrilled fault compartment.
    Operations and results
    Appraisal well 31/2-15 was spudded with the semi-submersible installation Borgny Dolphin on 10 September 1984 and drilled to TD at 1677 m in the Middle Jurassic Fensfjord Formation. No major problems were encountered in the operations. The well was drilled with seawater and hi-vis pills down to 810 m, with KCl/polymer mud from 810 m to 1460 m, and with chalk mud (calcium chloride/calcium carbonate) from 1460 m to TD.
    Top reservoir was encountered at 1482 m as prognosed, but the age of the upper part was found to be of  Paleocene and not Late Jurassic age. The expected Sognefjord Formation came in at 1515 m. The well thus correlate with the situation in well 31/2-18 and 31/2-18 A. Both the Paleocene sand and the Sognefjord Formation sand were gas filled, and the gas continued down to a low permeable micaceous gas/oil transition zone at 1561 m to 1567 m. Testing and sampling proved no mobile oil down to at least 1567 m, and the free oil level was concluded to be very close to the Field-GOC at 1572 m (1547 m SS). The OWC was unambiguously placed at 1583 m, in a highly permeable sand. No shows were recorded above 1482 m or below 1583 m. From petrophysical analysis there were indications of gas saturation in poor quality formation within a 10 m interval below top Fensfjord. However an RFT sample from his interval contained no oil, only gas and brine.
    Twelve cores were cut from 1486 m to 1595 m from the lower Paleocene, the Late Jurassic and Sognefjord Formation, and into the Heather Formation. A total of 4 RFT samples were taken. Of these 2 initial failed because of tight formation and seal failure while brine and gas were recovered from the samples at 1637 and 1568 m.
    The well was permanently abandoned on 15 November as a gas and oil appraisal.
    Testing
    Two tests were performed in the Late Jurassic sequence. Test 1 from 1572 m to 1580 m produced oil at rates up to 570 Sm3 /day. The GOR was 54 Sm3/Sm3 and the oil gravity was 28 deg API. Test 2 from 1564 m to 1567 m had the objective to establish hydrocarbon type in the gas/oil transition zone. It gave initially no flow, but after displacing the tubing content partially to nitrogen a small flow of gas was established (10000 m3 gas/day). The gas contained only trace amounts of condensate.

  • 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]
    490.00
    1676.00

  • 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
    1486.0
    1491.6
    [m ]
    2
    1493.0
    1499.8
    [m ]
    3
    1501.0
    1501.9
    [m ]
    4
    1503.0
    1507.5
    [m ]
    5
    1510.0
    1516.6
    [m ]
    6
    1516.5
    1520.5
    [m ]
    7
    1520.0
    1528.9
    [m ]
    8
    1530.0
    1532.5
    [m ]
    9
    1533.0
    1540.2
    [m ]
    10
    1541.0
    1559.0
    [m ]
    11
    1559.0
    1574.4
    [m ]
    12
    1577.0
    1588.2
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    91.6
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1486-1491m
    Core photo at depth: 1493-1499m
    Core photo at depth: 1499-1500m
    Core photo at depth: 1501-1502m
    Core photo at depth: 1503-1507m
    1486-1491m
    1493-1499m
    1499-1500m
    1501-1502m
    1503-1507m
    Core photo at depth: 1510-1516m
    Core photo at depth: 1516-1517m
    Core photo at depth: 1516-1520m
    Core photo at depth: 1520-1526m
    Core photo at depth: 1526-1528m
    1510-1516m
    1516-1517m
    1516-1520m
    1520-1526m
    1526-1528m
    Core photo at depth: 1530-1532m
    Core photo at depth: 1533-1539m
    Core photo at depth: 1539-1540m
    Core photo at depth: 1541-1547m
    Core photo at depth: 1547-1553m
    1530-1532m
    1533-1539m
    1539-1540m
    1541-1547m
    1547-1553m
    Core photo at depth: 1553-1559m
    Core photo at depth: 1559-1565m
    Core photo at depth: 1565-1571m
    Core photo at depth: 1571-1574m
    Core photo at depth: 1577-1583m
    1553-1559m
    1559-1565m
    1565-1571m
    1571-1574m
    1577-1583m
    Core photo at depth: 1583-1588m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    1583-1588m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1493.1
    [m]
    C
    OD
    1493.2
    [m]
    C
    OD
    1493.3
    [m]
    C
    OD
    1493.6
    [m]
    C
    OD
    1493.6
    [m]
    C
    OD
    1493.7
    [m]
    C
    OD

  • 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
    TEST1
    1572.00
    1584.00
    18.10.1984 - 00:00
    YES

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    368
    680
    1200
    1200
    1256
    1316
    1482
    1504
    1515
    1515
    1559
    1636

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.27

  • 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
    7.84
    pdf
    1.27
    pdf
    0.41
    pdf
    1.79
    pdf
    0.95
    pdf
    1.94
    pdf
    3.22
    pdf
    1.32
    pdf
    1.33
    pdf
    1.14
    pdf
    0.88
    pdf
    0.72
    pdf
    0.89
    pdf
    1.18
    pdf
    0.59
    pdf
    17.91
    pdf
    2.99
    pdf
    2.19
    pdf
    0.26
    pdf
    0.45

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL GR
    625
    1442
    CBL VDL GR
    850
    1631
    DLL MSFL GR
    1444
    1671
    ISF BHC GR
    466
    808
    ISF BHC GR
    800
    1437
    ISF BHC GR
    1444
    1676
    LDL CNL GR
    466
    808
    LDL CNL GR
    800
    1100
    LDL CNL GR
    1100
    1436
    LDL CNL SGR
    1444
    1676
    PCT
    1540
    1600
    RFT
    1496
    1562
    RFT
    1496
    1662
    RFT
    1496
    1662
    RFT
    1562
    1637
    RFT
    1562
    1637
    SHDT GR
    1444
    1674
    SWS
    58
    0
    VELOCITY
    450
    1676
    WST
    680
    1660

  • 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
    466.0
    36
    477.0
    0.00
    LOT
    SURF.COND.
    20
    800.5
    26
    810.0
    1.38
    LOT
    INTERM.
    13 3/8
    1444.0
    17 1/2
    1460.0
    1.62
    LOT
    INTERM.
    9 5/8
    1663.0
    12 1/4
    1677.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    430
    1.03
    9.0
    34.0
    WATER BASED
    11.09.1984
    477
    1.03
    WATER BASED
    12.09.1984
    480
    1.03
    15.0
    60.0
    WATER BASED
    13.09.1984
    810
    1.03
    6.0
    31.0
    WATER BASED
    14.09.1984
    810
    1.03
    6.0
    31.0
    WATER BASED
    16.09.1984
    810
    1.03
    WATER BASED
    17.09.1984
    810
    1.26
    20.0
    19.0
    WATER BASED
    18.09.1984
    810
    1.03
    6.0
    31.0
    WATER BASED
    16.09.1984
    810
    1.03
    WATER BASED
    16.09.1984
    810
    1.03
    WATER BASED
    17.09.1984
    810
    1.26
    20.0
    19.0
    WATER BASED
    18.09.1984
    810
    1.03
    WATER BASED
    16.09.1984
    1069
    1.26
    27.0
    18.0
    WATER BASED
    19.09.1984
    1440
    1.29
    18.0
    18.0
    WATER BASED
    20.09.1984
    1460
    1.29
    16.0
    16.0
    WATER BASED
    23.09.1984
    1460
    1.27
    14.0
    16.0
    WATER BASED
    23.09.1984
    1460
    1.27
    14.0
    16.0
    WATER BASED
    23.09.1984
    1474
    1.21
    14.0
    18.0
    WATER BASED
    25.09.1984
    1493
    1.21
    15.0
    19.0
    WATER BASED
    25.09.1984
    1510
    1.21
    15.0
    19.0
    WATER BASED
    26.09.1984
    1521
    1.21
    15.0
    19.0
    WATER BASED
    27.09.1984
    1530
    1.21
    15.0
    19.0
    WATER BASED
    29.09.1984
    1538
    1.21
    15.0
    19.0
    WATER BASED
    29.09.1984
    1562
    1.21
    18.0
    19.0
    WATER BASED
    29.09.1984
    1564
    1.20
    WATER BASED
    01.11.1984
    1572
    1.20
    WATER BASED
    17.10.1984
    1595
    1.21
    17.0
    20.0
    WATER BASED
    01.10.1984
    1634
    1.20
    WATER BASED
    14.10.1984
    1634
    1.20
    WATER BASED
    15.10.1984
    1634
    1.20
    WATER BASED
    16.10.1984
    1634
    1.20
    WATER BASED
    15.10.1984
    1634
    1.20
    WATER BASED
    16.10.1984
    1638
    1.23
    18.0
    21.0
    WATER BASED
    08.10.1984
    1638
    1.22
    17.0
    19.0
    WATER BASED
    10.10.1984
    1638
    1.23
    18.0
    21.0
    WATER BASED
    11.10.1984
    1638
    1.23
    18.0
    21.0
    WATER BASED
    14.10.1984
    1638
    1.20
    WATER BASED
    14.10.1984
    1638
    1.22
    17.0
    19.0
    WATER BASED
    10.10.1984
    1638
    1.23
    18.0
    21.0
    WATER BASED
    11.10.1984
    1638
    1.23
    18.0
    21.0
    WATER BASED
    14.10.1984
    1638
    1.20
    WATER BASED
    14.10.1984
    1663
    0.00
    WATER BASED
    21.10.1984
    1663
    1.22
    12.0
    19.0
    WATER BASED
    10.10.1984
    1677
    1.23
    18.0
    21.0
    WATER BASED
    08.10.1984
    1677
    1.24
    19.0
    21.0
    WATER BASED
    08.10.1984
    1677
    1.24
    20.0
    21.0
    WATER BASED
    08.10.1984
    1677
    1.24
    19.0
    21.0
    WATER BASED
    08.10.1984
    1677
    1.23
    19.0
    21.0
    WATER BASED
    03.10.1984
    1677
    1.24
    20.0
    21.0
    WATER BASED
    08.10.1984
    1677
    1.23
    18.0
    21.0
    WATER BASED
    08.10.1984

  • 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
    0.15