Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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6406/2-5 A

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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.
    6406/2-5 A
    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.
    NORWEGIAN 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.
    6406/2-5
    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.
    908-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.
    145
    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,
    02.10.1997
    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.
    23.02.1998
    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.
    23.02.2000
    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.
    24.09.2002
    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.
    GAS/CONDENSATE
    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.
    MIDDLE 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.
    GARN FM
    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.
    MIDDLE 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.
    ILE 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.
    341.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    5600.0
    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).
    4956.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    37.5
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    175
    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.
    ROR FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    64° 55' 53.83'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    6° 26' 58.65'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    7203444.56
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    379444.85
    UTM zone
    Universal Transverse Mercator zone. Examples of legal values: 31, 32, 33, 34.
    32
    NPDID wellbore
    Norwegian Offshore Directorate's unique id for the wellbore.
    3213

  • Wellbore history
    General
    Well 6406/2-5 A is a sidetrack well to 6406/2-5, drilled on the Kristin structure in the north-western part of block 6406/2, south-west of the Smørbukk Field and north-west of the Lavrans Field on Haltenbanken. The Kristin structure is a fault bounded horst block, somewhat eroded in the western part. The discovery well 6406/2-3 was drilled high on the structure and tested gas and condensate in a down-to situation in both the Garn and the Ile Formations, while the down flank well 6406/2-5 was water filled. The sidetrack well penetrated the Fangst Group reservoirs in an intermediate position between wells 6406/2-3 and 6406/2-5. The main objective of the sidetrack well was to identify the hydrocarbon water contacts in the Kristin structure and to test the hydrocarbon potential of the Garn and Ile Formations down flank of well 6406/2-3.
    Operations and results
    Appraisal well 6406/2-5 A was drilled as a deviated well with the semi-submersible drilling installation "Deepsea Bergen". The well was spudded on 29 September 1997 and permanently abandoned on 23 February 1998 after one drill stem test. The sidetrack was kicked off under the 18 5/8" shoe at 1404 m. Two attempts were made to reach the reservoir. The first, 6406/2-5 A, reached 2643 m, but had to be abandoned due to hole instability problems. The second sidetrack, 6406/2-5 A T2, reached the planned TD at 5600 m (4956 m TVD), 27 m TVD into the Upper Ror Formation and approximately 2 km NNW from well 6406/2-5. The well was drilled water based with KCl and glycol (ANCO 208 and Glydrill) from kick-off to 2825 m, and with oil based mud from 2825 m to TD. A total of 146,9 days were used for drilling, coring, logging, performing one DST, and permanently abandon the well. Of this, 30.3 % (or 44,5 days) was non-productive time (NPT). Waiting on weather caused a major part of this (11 days). Well 6406/2-5 A T2 found hydrocarbons, and hydrocarbon-water contacts were successfully penetrated in both the Garn and the Ile Formations. The 6406/2-5 A T2 Garn Formation reservoir parameters were intermediate compared to the good parameters of well 6406/2-3 and the marginal parameters of well 6406/2-5. In particular the permeability values of the three wells show a large range, with the 6406/2-5 AT2 values being intermediate. The Ile Formation reservoir parameters did not differ very much from what was measured in the recent wells, but showed large vertical variation in lithology and reservoir quality. Parts of the Ile Formation show excellent reservoir qualities. Pore pressures of the Jurassic units were very high, reaching a gradient of 1.95 g/cc BMW in upper part of the Garn Formation. A total of 172 meters (7 cores) were cored in the well, of which 98.6 % were recovered. No wire line fluid samples were obtained from this well. The well was plugged and abandoned as a gas/condansate appraisal well.
    Testing
    The Garn Formation was production tested in the interval 5304.4 - 5334 m (4691.3 - 4717.2 m TVD) with a gas rate of 221 500 Sm3/D and a condensate rate of 274 Sm3/D, giving a GOR of 821 Sm3/Sm3.

  • 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]
    1440.00
    5598.00

  • 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
    5307.0
    5316.2
    [m ]
    2
    5316.2
    5326.0
    [m ]
    3
    5326.0
    5353.7
    [m ]
    4
    5354.0
    5389.8
    [m ]
    5
    5390.5
    5429.3
    [m ]
    6
    5505.0
    5526.7
    [m ]
    7
    5527.0
    5553.9
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    169.8
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 5307-5312m
    Core photo at depth: 5312-5316m
    Core photo at depth: 5316-5321m
    Core photo at depth: 5321-5326m
    Core photo at depth: 5326-5331m
    5307-5312m
    5312-5316m
    5316-5321m
    5321-5326m
    5326-5331m
    Core photo at depth: 5331-5336m
    Core photo at depth: 5336-5341m
    Core photo at depth: 5341-5346m
    Core photo at depth: 5346-5351m
    Core photo at depth: 5351-5354m
    5331-5336m
    5336-5341m
    5341-5346m
    5346-5351m
    5351-5354m
    Core photo at depth: 5354-5359m
    Core photo at depth: 5359-5364m
    Core photo at depth: 5364-5369m
    Core photo at depth: 5369-5374m
    Core photo at depth: 5374-5379m
    5354-5359m
    5359-5364m
    5364-5369m
    5369-5374m
    5374-5379m
    Core photo at depth: 5379-5384m
    Core photo at depth: 5384-5389m
    Core photo at depth: 5389-5390m
    Core photo at depth: 5390-5395m
    Core photo at depth: 5395-5400m
    5379-5384m
    5384-5389m
    5389-5390m
    5390-5395m
    5395-5400m
    Core photo at depth: 5400-5405m
    Core photo at depth: 5405-5410m
    Core photo at depth: 5410-5415m
    Core photo at depth: 5415-5420m
    Core photo at depth: 5420-5425m
    5400-5405m
    5405-5410m
    5410-5415m
    5415-5420m
    5420-5425m
    Core photo at depth: 5425-5429m
    Core photo at depth: 5505-5510m
    Core photo at depth: 5510-5515m
    Core photo at depth: 5515-5520m
    Core photo at depth: 5520-5525m
    5425-5429m
    5505-5510m
    5510-5515m
    5515-5520m
    5520-5525m
    Core photo at depth: 5525-5527m
    Core photo at depth: 5527-5532m
    Core photo at depth: 5532-5537m
    Core photo at depth: 5537-5542m
    Core photo at depth: 5542-5547m
    5525-5527m
    5527-5532m
    5532-5537m
    5537-5542m
    5542-5547m
    Core photo at depth: 5547-5552m
    Core photo at depth: 5552-5554m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    5547-5552m
    5552-5554m

  • 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
    INTERM.
    13 3/8
    2818.0
    17 1/2
    2820.0
    2.01
    LOT
    INTERM.
    9 5/8
    5133.0
    12 1/4
    5143.0
    2.20
    LOT
    LINER
    7
    5600.0
    8 1/2
    5600.0
    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
    5304
    5334
    11.1
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    87.000
    38.000
    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
    274
    221500
    0.795
    0.745
    821

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.38

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.83
    pdf
    1.96

  • 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
    49.03

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    1433
    1.45
    27.0
    WATER BASED
    1731
    1.67
    44.0
    WATER BASED
    1731
    1.65
    36.0
    KCL MUD
    1833
    1.46
    29.0
    WATER BASED
    2022
    1.65
    41.0
    WATER BASED
    2181
    1.64
    40.0
    KCL MUD
    2274
    1.64
    30.0
    WATER BASED
    2643
    1.67
    34.0
    WATER BASED
    2643
    1.67
    36.0
    KCL MUD
    2825
    1.65
    50.0
    OIL BASED
    2825
    1.68
    46.0
    KCL MUD
    2825
    1.68
    46.0
    KCL MUD
    3510
    1.70
    58.0
    OIL BASED
    3802
    1.73
    52.0
    OIL BASED
    4003
    1.74
    53.0
    OIL BASED
    4098
    1.74
    55.0
    OIL BASED
    4200
    1.74
    54.0
    OIL BASED
    4379
    1.74
    56.0
    OIL BASED
    4404
    1.74
    58.0
    OIL BASED
    4533
    1.75
    56.0
    OIL BASED
    4690
    1.78
    53.0
    OIL BASED
    4763
    1.81
    55.0
    OIL BASED
    4860
    1.82
    57.0
    OIL BASED
    4949
    1.82
    63.0
    OIL BASED
    5104
    1.82
    55.0
    OIL BASED
    5143
    1.82
    55.0
    OIL BASED
    5149
    2.00
    74.0
    OIL BASED
    5157
    2.00
    62.0
    OIL BASED
    5184
    2.00
    57.0
    OIL BASED
    5218
    2.02
    60.0
    OIL BASED
    5277
    2.02
    61.0
    OIL BASED
    5302
    2.04
    60.0
    OIL BASED
    5325
    2.04
    67.0
    OIL BASED
    5354
    2.04
    65.0
    OIL BASED
    5391
    2.04
    65.0
    OIL BASED
    5429
    2.04
    OIL BASED
    5491
    2.04
    71.0
    OIL BASED
    5528
    2.04
    70.0
    OIL BASED
    5555
    2.04
    87.0
    OIL BASED
    5600
    2.04
    87.0
    OIL BASED
    5600
    2.04
    80.0
    OIL BASED
    5600
    1.24
    BRINE