Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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22.12.2024 - 01:25
Time of last synchronization with Norwegian Offshore Directorate's internal systems

34/4-11

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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.
    34/4-11
    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
    Press release
    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
    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.
    34/4-11
    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.
    Petro-Canada Norge 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.
    1278-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.
    90
    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,
    13.10.2009
    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.
    10.01.2010
    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.
    10.01.2012
    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.
    10.01.2012
    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.
    OIL
    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.
    YES
    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.
    BRENT GP
    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.
    EARLY 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.
    STATFJORD GP
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    29.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    375.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4327.0
    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).
    4326.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    4.5
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    144
    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 TRIASSIC
    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.
    LUNDE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    61° 38' 41'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 5' 53.74'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6835097.24
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    452218.98
    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.
    6227

  • Wellbore history
    General
    Well 34/4-11 was drilled north of the Snorre Field and ca two km northwest of the 34/4-10 R Brent oil discovery in the Marulk Basin in the Northern North Sea. The primary objective was to drill and evaluate the Beta central fault terrace to the northwest of 34/4-10 R. The Beta central fault terrace is situated on the same general structure as in 34/4-10 R, but on a different fault block. Secondary objectives were to evaluate the petroleum potential in the Early Jurassic Dunlin Group and Statfjord Formation.
    Operations and results
    Wildcat well 34/4-11 was spudded with the semi-submersible installation Songa Delta on 13 October 2009 and drilled to TD at 4327 m in Late Triassic sediments of the Lunde Formation. No significant problems were encountered in the operations. The well was drilled with seawater and hi-vis pills down to 1340 m, with Aqua-Drill mud containing 3.5 - 4.0 % glycol from 1340 m to 2293 m, and with Carbo-Sea oil based mud from 2293 m to TD.
    A 51 m thick Brent Group (primary target) was encountered at 3969 m (3938.7m TVD MSL), 18.7 m TVD deep to prognosis. The Brent Group was oil-bearing, but reservoir quality was poor with only 7 m net. The poor reservoir properties resulted in no successful RCI pretests. The Dunlin Group was present as a marginal siltstone facies from 4020 to 4131 m. The Statfjord Formation came in at 4131 m (4100.7 m TVD MSL) with sandstones with oil shows and drill gas peaks with a full C1-C5 chromatograph breakdown. The Statfjord Formation was seen to be an interbedded sequence of sandstone, siltstone and claystone. The Statfjord reservoir was oil bearing down-to at least 4215.7 m (4185.3 m TVD MSL). Petrophysical analyses proved 85 m gross and 22.4 m net oil bearing Statfjord reservoir with moderate quality sandstones with average porosity 19% and average water saturation of 0.38. There was a definite water-up-to at 4301.9 m (4271.5m TVD MSL).The RCI tool recorded two separate oil gradients within the Statfjord Formation oil zone with a reservoir pressure of 11291 psia at 4103.3 m TVD MSL. The underlying logged Statfjord water reservoir had very poor quality sandstones. No shows were recorded above Brent Group level.
    Two cores were cut 3976 to 4012 m in the Brent Group with 100% recovery. The wire line logging was very successful with full log data acquired, including 9 x PVT, 6 x single phase and 2 x large volume (10 litre) oil samples from two sampling depths in the Statfjord Formation (4200.3 m and 4162.3 m) and 33 rotary side wall cores. The oil sample at 4162 m was analysed to contain 38.2 deg API oil at reservoir pressure of 11291 psia. However the water bearing basal Statfjord section was of too poor quality sandstones and no water sample was obtained.
    The well was permanently abandoned on 10 January 2010 as an oil discovery.
    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]
    1350.00
    4325.00

  • 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
    483.0
    36
    487.0
    0.00
    LOT
    SURF.COND.
    20
    1336.0
    26
    1340.0
    1.80
    LOT
    INTERM.
    13 3/8
    2286.0
    17 1/2
    2293.0
    1.86
    LOT
    INTERM.
    9 5/8
    3825.0
    12 1/4
    3830.0
    2.14
    LOT
    OPEN HOLE
    4327.0
    8 1/2
    4327.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    MREX
    3960
    4310
    MWD - CORE
    3976
    3985
    MWD - DIR
    404
    487
    MWD - GR RES AC BHPR MECH
    1340
    2293
    MWD - GR RES BHPR MECH
    404
    1340
    MWD - GR RES BRES AC BHPR MECH
    3830
    4327
    MWD - GR RES NBG BRES AC BHPR ME
    2293
    3830
    PCOR
    3969
    4316
    PCOR
    4133
    4235
    RCI
    4162
    4215
    RCI PRESS
    3969
    4316
    VSP
    1937
    4310
    WGI HDIL XMAC ZDL CN DSL
    3700
    4325

  • Lithostratigraphy

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    433
    1.05
    SEA WATER
    483
    1.05
    SPUD MUD
    1420
    1.54
    23.0
    AQUACOL KCL/POLYMER/GLYCOL
    1580
    1.65
    32.0
    CARBO TECH
    2293
    1.55
    27.0
    AQUACOL KCL/POLYMER/GLYCOL
    3120
    1.62
    39.0
    CARBO TECH
    3830
    1.66
    59.0
    CARBO TECH
    3900
    2.00
    57.0
    CARBO TECH
    4012
    1.93
    50.0
    CARBO TECH
    4120
    2.00
    57.0
    CARBO TECH
    4325
    1.93
    48.0
    CARBO TECH
    4327
    2.00
    53.0
    CARBO TECH
    4327
    1.93
    49.0
    CARBO TECH