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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34/7-28

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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.
    34/7-28
    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
    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
    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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    34/7-28
    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.
    921-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.
    63
    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,
    30.12.1997
    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.
    02.03.1998
    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.
    02.03.2000
    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.
    28.02.2008
    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.
    WILDCAT
    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.
    DRY
    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
    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.
    304.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    3005.0
    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).
    3005.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    1.7
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    104
    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.
    DRAKE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    61° 28' 7.55'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 1' 5.61'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6815558.64
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    447682.94
    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.
    3282

  • Wellbore history
    General
    Well 34/7-28 is located in the Tampen area in the Northern North Sea. It was drilled on a prospect situated north east of the Statfjord Nord field and east of the Snorre field. The well tested the NW III prospect, which was defined as a stratigraphic trap with pinch out of the Draupne Formation. The sands in the Draupne Formation were expected to be erosional products from the Snorre block positioned in a north east direction of the well.
    Operations and results
    Wildcat well 34/7-28 was spudded with the semi-submersible installation Transocean Leader on 30 December 1997. The well was initially drilled to a total depth of 1267 m in the 12 l/4" section where the decision was made to plug and abandon the well. The abandonment was due to concerns over the integrity of the 18 3/4" wellhead housing, which had suffered damage during BOP latching procedures. At this time a total of 24.9 days had been spent on the well. With the rig moved ca. 25 m NNE from the original location, well 34/7-28 was re-spudded on 24 January 1998 and drilled to TD at 3005 m in the Middle Jurassic Drake Formation. The final 34/7-28 well was drilled with sea water and bentonite hi-vis sweeps down to 1300 m, with silicate mud from 1300 m to 2165 m, and with KCl/glycol mud ("Aqaucol D" polypropylene glycols) from 2165 m to TD.
    Apart from the Utsira Formation only traces of sand was penetrated above top Jurassic. Sandstones were encountered in the prospective level of the Viking Group. The uppermost sand at 2666 m was a 3 m thick Intra Draupne Formation sandstone overlying 10 m of Heather Formation shale. The lower sand at 2679 m was a 16 m thick Intra Heather Formation sandstone, interpreted as a gravitation deposit. Both sandstones were penetrated at shallower depth than the oil-water contact in Statfjord Nord and both were water filled. An undifferentiated sequence of water filled Rannoch/Etive Formations sandstones was penetrated from 2805 to 2972 m. Pressure measurements showed that the sands in the Viking group were in communication, but they were not in communication with the sands in the Brent Group. From this it was concluded that the base seal was intact, and the fault to the south west was sealing. Weak shows were described in the core from the Intra Heather Formation sandstone, but subsequent geochemical analyses in the laboratory were not able to confirm this. This was the only indication of hydrocarbons in the well.
    Two cores were cut in the Intra Heather Formation sandstone and Heather Formation shale from 2668-2694 m and 2694-2726.5 m. The sands were massive and had good visible porosity. MDT pressure tests were carried out in the Viking Group and in the Brent Group. No fluid sampling was attempted.
    The well was permanently abandoned on 3 March 1998 as a dry well.
    Testing
    No drill stem test was performed.

  • 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]
    1310.00
    2924.00

  • 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
    2668.0
    2692.7
    [m ]
    2
    2694.0
    2725.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    55.7
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 2668-2673m
    Core photo at depth: 2673-2678m
    Core photo at depth: 2678-2683m
    Core photo at depth: 2683-2688m
    Core photo at depth: 2688-2692m
    2668-2673m
    2673-2678m
    2678-2683m
    2683-2688m
    2688-2692m
    Core photo at depth: 2694-2699m
    Core photo at depth: 2699-2704m
    Core photo at depth: 2704-2709m
    Core photo at depth: 2709-2714m
    Core photo at depth: 2714-2719m
    2694-2699m
    2699-2704m
    2704-2709m
    2709-2714m
    2714-2719m
    Core photo at depth: 2719-2724m
    Core photo at depth: 2724-2725m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    2719-2724m
    2724-2725m

  • 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
    376.0
    36
    380.0
    0.00
    LOT
    SURF.COND.
    13 3/8
    1293.0
    17 1/2
    1295.0
    1.69
    LOT
    INTERM.
    9 5/8
    2154.0
    12 1/4
    2155.0
    1.78
    LOT
    OPEN HOLE
    3005.0
    8 1/2
    3005.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CST GR
    2653
    3000
    FMI DSI NGT
    2154
    3005
    MDT GR
    2667
    2957
    MWD - DIR
    328
    379
    MWD - GR RES DIR
    379
    3005
    PEX HALS
    2154
    3005
    VSP
    1410
    3000

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.14
    pdf
    4.49

  • 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
    35.23

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    1300
    1.37
    13.0
    WATER BASED
    1964
    1.59
    18.0
    WATER BASED
    2165
    1.59
    21.0
    WATER BASED
    2425
    1.58
    34.0
    WATER BASED
    2692
    1.58
    32.0
    WATER BASED
    2711
    1.58
    29.0
    WATER BASED
    3005
    1.58
    WATER BASED

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1330.0
    [m]
    DC
    UOS
    1370.0
    [m]
    DC
    UOS
    1410.0
    [m]
    DC
    UOS
    1450.0
    [m]
    DC
    UOS
    1490.0
    [m]
    DC
    UOS
    1530.0
    [m]
    DC
    UOS
    1570.0
    [m]
    DC
    UOS
    1610.0
    [m]
    DC
    UOS
    1650.0
    [m]
    DC
    UOS
    1690.0
    [m]
    DC
    UOS
    1730.0
    [m]
    DC
    UOS
    1770.0
    [m]
    DC
    UOS
    1810.0
    [m]
    DC
    UOS
    1850.0
    [m]
    DC
    UOS
    1880.0
    [m]
    DC
    UOS
    1900.0
    [m]
    DC
    UOS
    1920.0
    [m]
    DC
    UOS
    1940.0
    [m]
    DC
    UOS
    1960.0
    [m]
    DC
    UOS
    1980.0
    [m]
    DC
    UOS
    2000.0
    [m]
    DC
    UOS
    2020.0
    [m]
    DC
    UOS
    2040.0
    [m]
    DC
    UOS
    2065.0
    [m]
    DC
    UOS
    2080.0
    [m]
    DC
    UOS
    2100.0
    [m]
    DC
    UOS
    2120.0
    [m]
    DC
    UOS
    2140.0
    [m]
    DC
    UOS
    2155.0
    [m]
    DC
    UOS
    2180.0
    [m]
    DC
    UOS
    2200.0
    [m]
    DC
    UOS
    2220.0
    [m]
    DC
    UOS
    2240.0
    [m]
    DC
    UOS
    2260.0
    [m]
    DC
    UOS
    2280.0
    [m]
    DC
    UOS
    2295.0
    [m]
    DC
    UOS
    2320.0
    [m]
    DC
    UOS
    2340.0
    [m]
    DC
    UOS
    2360.0
    [m]
    DC
    UOS
    2380.0
    [m]
    DC
    UOS
    2400.0
    [m]
    DC
    UOS
    2420.0
    [m]
    DC
    UOS
    2440.0
    [m]
    DC
    UOS
    2460.0
    [m]
    DC
    UOS
    2480.0
    [m]
    DC
    UOS
    2500.0
    [m]
    DC
    UOS
    2520.0
    [m]
    DC
    UOS
    2540.0
    [m]
    DC
    UOS
    2555.0
    [m]
    DC
    UOS
    2580.0
    [m]
    DC
    UOS
    2600.0
    [m]
    DC
    UOS
    2620.0
    [m]
    DC
    UOS
    2640.0
    [m]
    DC
    UOS
    2660.0
    [m]
    DC
    UOS
    2668.0
    [m]
    C
    NETW
    2669.0
    [m]
    C
    NETW
    2670.0
    [m]
    C
    NETW
    2671.0
    [m]
    C
    NETW
    2672.0
    [m]
    C
    NETW
    2673.0
    [m]
    C
    NETW
    2674.0
    [m]
    C
    NETW
    2675.0
    [m]
    C
    NETW
    2676.0
    [m]
    C
    NETW
    2677.0
    [m]
    C
    NETW
    2679.0
    [m]
    C
    NETW
    2680.0
    [m]
    C
    NETW
    2681.0
    [m]
    C
    NETW
    2684.0
    [m]
    C
    NETW
    2686.0
    [m]
    C
    NETW
    2687.0
    [m]
    C
    NETW
    2688.0
    [m]
    C
    NETW
    2690.0
    [m]
    C
    NETW
    2691.0
    [m]
    C
    NETW
    2692.0
    [m]
    C
    NETW
    2694.0
    [m]
    C
    NETW
    2695.0
    [m]
    C
    NETW
    2696.0
    [m]
    DC
    NETW
    2697.0
    [m]
    DC
    NETW
    2698.0
    [m]
    DC
    NETW
    2703.0
    [m]
    DC
    NETW
    2704.0
    [m]
    DC
    NETW
    2706.0
    [m]
    DC
    NETW
    2707.0
    [m]
    DC
    NETW
    2709.0
    [m]
    DC
    NETW
    2711.0
    [m]
    DC
    NETW
    2712.0
    [m]
    C
    NETW
    2713.0
    [m]
    C
    NETW
    2715.0
    [m]
    C
    NETW
    2716.0
    [m]
    C
    NETW
    2717.0
    [m]
    C
    NETW
    2718.0
    [m]
    C
    NETW
    2721.0
    [m]
    C
    NETW
    2722.0
    [m]
    C
    NETW
    2723.0
    [m]
    C
    NETW
    2724.0
    [m]
    C
    NETW
    2726.0
    [m]
    DC
    UOS
    2735.0
    [m]
    DC
    UOS
    2744.0
    [m]
    DC
    UOS
    2750.0
    [m]
    DC
    UOS
    2759.0
    [m]
    DC
    UOS
    2768.0
    [m]
    DC
    UOS
    2777.0
    [m]
    DC
    UOS
    2786.0
    [m]
    DC
    UOS
    2792.0
    [m]
    DC
    UOS
    2801.0
    [m]
    DC
    UOS
    2807.0
    [m]
    DC
    UOS
    2816.0
    [m]
    DC
    UOS
    2825.0
    [m]
    DC
    UOS
    2834.0
    [m]
    DC
    UOS
    2843.0
    [m]
    DC
    UOS
    2852.0
    [m]
    DC
    UOS
    2861.0
    [m]
    DC
    UOS
    2870.0
    [m]
    DC
    UOS
    2888.0
    [m]
    DC
    UOS
    2897.0
    [m]
    DC
    UOS
    2906.0
    [m]
    DC
    UOS
    2915.0
    [m]
    DC
    UOS
    2924.0
    [m]
    DC
    UOS
    2933.0
    [m]
    DC
    UOS
    2942.0
    [m]
    DC
    UOS
    2951.0
    [m]
    DC
    UOS
    2960.0
    [m]
    DC
    UOS
    2969.0
    [m]
    DC
    UOS
    2978.0
    [m]
    DC
    UOS
    2987.0
    [m]
    DC
    UOS
    2996.0
    [m]
    DC
    UOS
    3005.0
    [m]
    DC
    UOS