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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31/5-3

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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.
    31/5-3
    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
    Multilateral
    Indicator telling if the parent well is multilateral, meaning it has more than one branch radiating from the main borehole. Example of legal values: YES, NO. See also Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    NO
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    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.
    31/5-3
    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.
    Saga Petroleum ASA
    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.
    405-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.
    61
    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,
    10.04.1984
    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.
    09.06.1984
    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.
    09.06.1986
    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
    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.
    26.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    327.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2250.0
    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).
    2249.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    3.2
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    90
    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.
    DRAKE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 44' 37.17'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 26' 20.44'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6734474.49
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    523936.46
    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.
    101

  • Wellbore history
    General
    Well 31/5-3 was drilled in the southern part of the Troll West Field. The main objectives were to appraise and test the reservoir qualities and the lithology of the Late Jurassic Sognefjord Formation.
    Operations and results
    Well 31/5-3 was spudded with the semi-submersible installation Treasure Saga on 10 April 1984 and drilled to TD at 2250 m in the Late Jurassic Drake Formation. At 1426 m circulation was lost, and 450 bbls mud was lost to formation before the well was stabilized. The well was drilled with spud mud down to 950 m, with KCl/polymer mud from 950 m to 1497 m, and with a Pro-wate/NaCl-brine/pro-salt mud from 1497 m to TD.
    The well proved the existence of a stratigraphy ranging from Lower Jurassic to Quarternary. The Tertiary and Quaternary sections were mainly composed of claystones, with a minor sand developed in Pleistocene at the base of the Nordland Group. The Jurassic was composed of sandstone and siltstones in the Viking and Brent Groups, and mainly claystone with an interbedded sandstone layer in the Dunlin Group. One major unconformity was found between Early Portlandian and Maastrichtian. Four other unconformities were also observed in the well, from Aalenian to Bathonian, from Early Kimmeridgian to Early Portlandian, from Late Oligocene to Pliocene, and one intra-Oligocene.
    The Sognefjord Formation was hydrocarbon bearing with a 39.5 m hydrocarbon column, of which 17.5 m was gas and 22 m was oil. Top reservoir was found at 1555 m, the GOC was at 1572.5 m, and the OWC at 1594.5 m. Oil shows persisted further down, but decreased from 1595 m and disappeared below 1622 m. No other interval in the well was hydrocarbon bearing.
    Three cores were cut from 1550 m to 1622.5 m in the Late Jurassic Sognefjord Formation. FMT gas samples were taken at 1557 m and 1567. Three more FMT fluid samples were taken in the oil zone at 1577 m, 1591 m, and at 1592 m.
    The well was permanently abandoned on 9 June 1984 as a gas and oil appraisal well.
    Testing
    Two drill stem tests were performed in the Sognefjord Formation. Both the intervals were gravel packed. DST # 1 from 1606 - 1610 m produced formation water. DST # 2 from 1582.3 - 1586.3 m produced 1100 Sm3/day of oil with a constant GOR of approximately 55Sm3/Sm3. Gas coning occurred as the rate was increased to 1550 m /day. The GOR stabilized at its original value as the rate was reduced to 1050 Sm3 /day

  • 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]
    440.00
    2250.00

  • 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
    1550.0
    1568.0
    [m ]
    2
    1568.0
    1594.4
    [m ]
    3
    1595.0
    1622.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    71.4
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1550-1555m
    Core photo at depth: 155-1560m
    Core photo at depth: 1560-1565m
    Core photo at depth: 1565-1568m
    Core photo at depth: 1568-1573m
    1550-1555m
    155-1560m
    1560-1565m
    1565-1568m
    1568-1573m
    Core photo at depth: 1573-1578m
    Core photo at depth: 1578-1583m
    Core photo at depth: 1583-1588m
    Core photo at depth: 1588-1593m
    Core photo at depth: 1593-1594m
    1573-1578m
    1578-1583m
    1583-1588m
    1588-1593m
    1593-1594m
    Core photo at depth: 1595-1600m
    Core photo at depth: 1600-1605m
    Core photo at depth: 1605-1610m
    Core photo at depth: 1610-1615m
    Core photo at depth: 1615-1620m
    1595-1600m
    1600-1605m
    1605-1610m
    1610-1615m
    1615-1620m
    Core photo at depth: 1620-1622m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    1620-1622m

  • 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
    DST2
    1582.30
    1586.30
    OIL
    02.06.1984 - 19:00
    YES

  • 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
    425.0
    36
    430.0
    0.00
    LOT
    SURF.COND.
    20
    950.0
    26
    963.0
    1.89
    LOT
    INTERM.
    13 3/8
    1497.0
    17 1/2
    1515.0
    1.57
    LOT
    INTERM.
    9 5/8
    1905.0
    12 1/4
    2236.0
    1.73
    LOT
    OPEN HOLE
    2253.0
    8 1/2
    2253.0
    0.00
    LOT

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    1606
    1618
    0.0
    2.0
    1582
    1586
    44.5
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    71
    2.0
    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
    2.0
    1230
    59040
    0.650
    48

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CDL CNL GR
    1497
    1911
    CDL CNL GR
    1905
    2244
    CDL GR
    425
    964
    CDL GR
    950
    1506
    DIFL LSBHC GR
    425
    965
    DIFL LSBHC GR
    950
    1512
    DIFL LSBHC GR
    1497
    1914
    DIFL LSBHC GR
    1905
    2246
    DIPLOG
    1492
    1900
    DIPLOG
    1905
    2243
    DLL MLL GR
    1497
    1912
    FMT
    1555
    1663
    FMT
    1948
    2168
    GR
    327
    430
    SPECTRALOG
    1497
    1906
    VELOCITY
    970
    2230

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.35

  • 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
    12.08

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    426
    1.03
    WATER BASED
    30.04.1984
    430
    1.03
    WATER BASED
    30.04.1984
    440
    1.08
    WATER BASED
    30.04.1984
    791
    1.14
    WATER BASED
    30.04.1984
    837
    1.16
    WATER BASED
    30.04.1984
    963
    1.20
    47.0
    25.0
    WATER BASED
    30.04.1984
    963
    1.20
    47.0
    25.0
    WATER BASED
    30.04.1984
    963
    1.18
    WATER BASED
    30.04.1984
    965
    1.14
    WATER BASED
    30.04.1984
    1080
    1.30
    49.0
    28.0
    WATER BASED
    30.04.1984
    1177
    1.25
    47.0
    24.0
    WATER BASED
    30.04.1984
    1395
    1.30
    49.0
    28.0
    WATER BASED
    30.04.1984
    1426
    1.30
    46.0
    24.0
    WATER BASED
    30.04.1984
    1515
    1.30
    46.0
    23.0
    WATER BASED
    30.04.1984
    1515
    1.30
    46.0
    23.0
    WATER BASED
    30.04.1984
    1515
    1.30
    46.0
    23.0
    WATER BASED
    30.04.1984
    1518
    1.18
    80.0
    60.0
    WATER BASED
    30.04.1984
    1568
    1.18
    78.0
    50.0
    WATER BASED
    30.04.1984
    1595
    1.00
    78.0
    51.0
    WATER BASED
    03.05.1984
    1623
    1.18
    69.0
    45.0
    WATER BASED
    03.05.1984
    1730
    1.18
    77.0
    52.0
    WATER BASED
    03.05.1984
    1880
    1.18
    80.0
    54.0
    WATER BASED
    03.05.1984
    1915
    1.18
    79.0
    56.0
    WATER BASED
    03.05.1984
    1915
    1.18
    78.0
    53.0
    WATER BASED
    03.05.1984
    1915
    1.18
    85.0
    60.0
    WATER BASED
    03.05.1984
    1915
    1.19
    87.0
    58.0
    WATER BASED
    04.05.1984
    1915
    1.19
    75.0
    52.0
    WATER BASED
    07.05.1984
    1915
    1.19
    87.0
    58.0
    WATER BASED
    04.05.1984
    1915
    1.18
    78.0
    53.0
    WATER BASED
    03.05.1984
    1915
    1.18
    85.0
    60.0
    WATER BASED
    03.05.1984
    1915
    1.19
    75.0
    52.0
    WATER BASED
    07.05.1984
    2236
    1.20
    61.0
    42.0
    WATER BASED
    07.05.1984
    2250
    1.20
    61.0
    42.0
    WATER BASED
    08.05.1984
    2250
    0.00
    61.0
    42.0
    WATER BASED
    07.06.1984