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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6507/6-4 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.
    6507/6-4 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).
    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
    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.
    NORWEGIAN SEA
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    6507/6-4
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    Sinbad:line 3665-xline 3402 & Sesamline :3717-xline 3525
    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.
    E.ON Ruhrgas 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.
    1387-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.
    75
    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,
    16.11.2011
    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.
    29.01.2012
    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.
    15.03.2013
    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.
    15.03.2013
    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
    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.
    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.
    31.2
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    363.5
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4957.0
    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).
    4391.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    40
    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.
    PERMIAN
    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.
    ROTLIEGEND GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    65° 38' 6.2'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    7° 43' 32.8'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    7280010.99
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    441342.38
    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.
    6753

  • Wellbore history
    General
    Well 6507/6-4 A is a geologic sidetrack to well 6507/6-4 S on the Sør High of the Nordland Ridge in the Norwegian Sea. The distance to the Skarv Field immediately to the west is 10 km and to the Heidrun Field (to the SSW) approximately 30 km. The sidetrack targeted the Sesam prospect, a separate prospect from the Late Triassic Sinbad prospect targeted by the primary well 6507/6-4 S. The Sesam prospect was interpreted as Late Permian platform carbonates reefs/build ups as seen in the Foldvik Creek Group of East Greenland. This target/facies was until drilling 6507/6-4 A unproven in the Norwegian Sea.
    Operations and results
    The well bore 6507/6-4 A was kicked off at 753 m in well bore 6507/6-4 S on 16 November 2011. It was drilled with the semi-submersible installation Borgland Dolphin to TD at 4957 m in Permian conglomerates. Operations were suspended several times during the storms "Berit", "Cato", and "Dagmar", causing a significant amount of WOW for this well. The well was drilled with Carbo-Sea Oil based mud from kick-off to TD in the 12 1/4" section at 4240 m, and with Aqua-Drill water based mud from 4240 m to TD. The Aqua-Drill mud contained Aqua-col, a glycol additive used for shale inhibition. In addition it was reported in the geochemical report that the water based mud was contaminated with 3% oil from the oil base used in the above section.
    The deeper sections of well 6507/6-4 A, the Earliest Triassic and the Permian, can be correlated to East Greenland stratigraphy and to the shallow IKU boreholes on the eastern margin of the Helgeland Basin (IKU 6611/9-U-1 and 6611/9-U-2). Using this "Greenland stratigraphy", top Wordie Creek Formation Eq. is interpreted at 4248 m (3683 m TVD), top Schuchert Dal Formation Eq. at 4652 m (4087 m TVD), and top Ravnefjeld Formation Eq. at 4673 m (4107 m TVD). The Ravnefjeld Formation Eq. is 43 m thick MD (40 m TVD) and show two high Gamma Ray sequences. The TOC levels in cuttings from the Ravnefjeld Formation Eq. were modest, from 0.6 to 1.2 %. Due to mud contamination of the Rock-eval the quality of the kerogen in the Ravnefjeld Formation Eq. (the Hydrogen Index) could not be assessed.
    The target section for the Sesam Prospect was penetrated from 4716 to 4790 m (4147 to 4224 m TVD). As hoped for, the formation was found to consist of limestone, but was relative argillaceous and turned out to be very tight with very low porosity. No shows were recorded while drilling the well. Upon organic geochemical analysis of the cored section the extract from a cored grey-black shale at 4734.1 m showed trace amounts of condensate-like hydrocarbons. Vitrinite reflectance at this level was ca 1.1 %Ro, in agreement with the maturity inferred for the hydrocarbons in the extract from 4734.1 m. Otherwise extracts from the cored section showed no obvious petroleum signatures above the mud contaminants.
    A core of 27.5 m was cut in the equivalents to Foldvik Creek Group Eq./Wegener Halvø Formation Eq. from 4726 to 4753.5 m with 100% recovery. Two wire line logs were run but no fluid samples were taken.
    The well was permanently abandoned on 29 January 2012 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]
    770.00
    4958.00

  • 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
    4726.0
    4754.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    28.0
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1040.0
    [m]
    DC
    FUGRO
    1052.0
    [m]
    DC
    FUGRO
    1064.0
    [m]
    DC
    FUGRO
    1073.0
    [m]
    DC
    FUGRO
    1085.0
    [m]
    DC
    FUGRO
    1094.0
    [m]
    DC
    FUGRO
    1106.0
    [m]
    DC
    FUGRO
    1115.0
    [m]
    DC
    FUGRO
    1124.0
    [m]
    DC
    FUGRO
    1133.0
    [m]
    DC
    FUGRO
    1142.0
    [m]
    DC
    FUGRO
    1151.0
    [m]
    DC
    FUGRO
    1160.0
    [m]
    DC
    FUGRO
    1175.0
    [m]
    DC
    FUGRO
    1184.0
    [m]
    DC
    FUGRO
    1196.0
    [m]
    DC
    FUGRO
    1205.0
    [m]
    DC
    FUGRO
    1214.0
    [m]
    DC
    FUGRO
    1220.0
    [m]
    DC
    FUGRO
    1229.0
    [m]
    DC
    FUGRO
    1238.0
    [m]
    DC
    FUGRO
    1247.0
    [m]
    DC
    FUGRO
    1256.0
    [m]
    DC
    FUGRO
    1265.0
    [m]
    DC
    FUGRO
    1272.0
    [m]
    DC
    FUGRO
    1280.0
    [m]
    DC
    FUGRO
    1290.0
    [m]
    DC
    FUGRO
    1300.0
    [m]
    DC
    FUGRO
    1330.0
    [m]
    DC
    FUGRO
    1380.0
    [m]
    DC
    FUGRO
    1410.0
    [m]
    DC
    FUGRO
    1430.0
    [m]
    DC
    FUGRO
    1450.0
    [m]
    DC
    FUGRO
    1480.0
    [m]
    DC
    FUGRO
    1510.0
    [m]
    DC
    FUGRO
    1540.0
    [m]
    DC
    FUGRO
    1560.0
    [m]
    DC
    FUGRO
    1590.0
    [m]
    DC
    FUGRO
    1610.0
    [m]
    DC
    FUGRO
    1620.0
    [m]
    DC
    FUGRO
    1650.0
    [m]
    DC
    FUGRO
    1670.0
    [m]
    DC
    FUGRO
    1700.0
    [m]
    DC
    FUGRO
    1730.0
    [m]
    DC
    FUGRO
    1770.0
    [m]
    DC
    FUGRO
    1800.0
    [m]
    DC
    FUGRO
    1830.0
    [m]
    DC
    FUGRO
    1860.0
    [m]
    DC
    FUGRO
    1890.0
    [m]
    DC
    FUGRO
    1920.0
    [m]
    DC
    FUGRO
    1960.0
    [m]
    DC
    FUGRO
    1990.0
    [m]
    DC
    FUGRO
    2020.0
    [m]
    DC
    FUGRO
    2050.0
    [m]
    DC
    FUGRO
    2090.0
    [m]
    DC
    FUGRO
    2130.0
    [m]
    DC
    FUGRO
    2160.0
    [m]
    DC
    FUGRO
    2210.0
    [m]
    DC
    FUGRO
    2240.0
    [m]
    DC
    FUGRO
    2280.0
    [m]
    DC
    FUGRO
    2420.0
    [m]
    DC
    FUGRO
    2920.0
    [m]
    DC
    FUGRO
    2980.0
    [m]
    DC
    FUGRO
    3140.0
    [m]
    DC
    FUGRO
    3150.0
    [m]
    DC
    FUGRO
    3180.0
    [m]
    DC
    FUGRO
    3200.0
    [m]
    DC
    FUGRO
    3230.0
    [m]
    DC
    FUGRO
    3260.0
    [m]
    DC
    FUGRO
    3290.0
    [m]
    DC
    FUGRO
    3330.0
    [m]
    DC
    FUGRO
    3350.0
    [m]
    DC
    FUGRO
    3370.0
    [m]
    DC
    FUGRO
    3390.0
    [m]
    DC
    FUGRO
    3410.0
    [m]
    DC
    FUGRO
    3430.0
    [m]
    DC
    FUGRO
    3450.0
    [m]
    DC
    FUGRO
    3470.0
    [m]
    DC
    FUGRO
    3500.0
    [m]
    DC
    FUGRO
    3540.0
    [m]
    DC
    FUGRO
    3570.0
    [m]
    DC
    FUGRO
    3600.0
    [m]
    DC
    FUGRO
    4150.0
    [m]
    DC
    FUGRO
    4180.0
    [m]
    DC
    FUGRO
    4210.0
    [m]
    DC
    FUGRO
    4280.0
    [m]
    DC
    FUGRO
    4285.0
    [m]
    DC
    FUGRO
    4290.0
    [m]
    DC
    FUGRO
    4295.0
    [m]
    DC
    FUGRO
    4300.0
    [m]
    DC
    FUGRO
    4345.0
    [m]
    DC
    FUGRO
    4680.0
    [m]
    DC
    FUGRO
    4685.0
    [m]
    DC
    FUGRO
    4690.0
    [m]
    DC
    FUGRO
    4695.0
    [m]
    DC
    FUGRO
    4715.0
    [m]
    DC
    FUGRO
    4717.0
    [m]
    DC
    FUGRO
    4719.0
    [m]
    DC
    FUGRO
    4721.0
    [m]
    DC
    FUGRO
    4723.0
    [m]
    DC
    FUGRO
    4725.0
    [m]
    DC
    FUGRO
    4752.4
    [m]
    C
    FUGRO
    4753.4
    [m]
    C
    FUGRO
    4912.0
    [m]
    DC
    FUGRO
    4934.0
    [m]
    DC
    FUGRO
    4942.0
    [m]
    DC
    FUGRO
    4954.0
    [m]
    DC
    FUGRO
    4956.0
    [m]
    DC
    FUGRO
    4957.0
    [m]
    DC
    FUGRO
    4958.0
    [m]
    DC
    FUGRO

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    395
    395
    852
    1040
    1040
    1209
    1289
    4652
    4895

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.24

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    MRCH JAR TTRM GR RCEX SP
    4717
    4718
    MWD - APX
    753
    2410
    MWD - CAL ORD CCN APX
    4245
    4726
    MWD - CAL ORD CCN APX
    4753
    4957
    MWD - ORD CCN CAL TTK APX
    2410
    4245
    VSP
    86
    4707

  • 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
    2401.0
    17 1/2
    2410.0
    0.00
    LOT
    INTERM.
    9 5/8
    4240.0
    12 1/4
    4245.0
    0.00
    LOT
    OPEN HOLE
    4957.0
    8 1/2
    4957.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    2020
    1.30
    20.0
    CARBO-SEA
    2351
    1.30
    25.0
    Carbosea OBM
    2410
    1.30
    25.0
    CARBO-SEA
    3277
    1.30
    20.0
    CARBO-SEA
    4190
    1.30
    20.0
    CARBO-SEA
    4302
    1.30
    20.0
    Aqua-drill
    4957
    1.34
    16.0
    Aqua-drill
    4957
    1.30
    15.0
    Aqua-drill