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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7121/1-1 R

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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.
    7121/1-1 R
    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
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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.
    BARENTS SEA
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    7121/1-1
    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.
    Esso Exploration and Production Norway A/S
    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.
    487-L2
    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.
    158
    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,
    18.03.1986
    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.
    23.08.1986
    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.
    23.08.1988
    Plugged and abondon date
    Date when the P&A-operations of the wellbore was finished, as reported by the operator to the Norwegian Offshore Directorate throught DDRS (Daily Drilling Reporting System). Only applied once pr. wellhead/surface location.
    23.08.1986
    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.
    11.04.2003
    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.
    SHOWS
    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.
    26.8
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    369.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    5000.0
    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).
    5000.0
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    146
    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 CARBONIFEROUS
    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.
    ØRN FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    71° 56' 25.74'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    21° 4' 36.52'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    7982512.86
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    502657.85
    UTM zone
    Universal Transverse Mercator zone. Examples of legal values: 31, 32, 33, 34.
    34
    NPDID wellbore
    Norwegian Offshore Directorate's unique id for the wellbore.
    896

  • Wellbore history
    General
    Well 7121/1-1 was drilled on the Loppa High in the northern part of the Tromsøflaket area, offshore Northern Norway.
    The primary objective of the 7121/1-1 exploration well was to test the reservoir and hydrocarbon potential of a possible Early Permian (Artinskian) mounded carbonate facies (biohermal build-ups) identified by seismic. Secondary objectives were Late Permian carbonates and Early Carboniferous to Devonian sandstones, Late Carboniferous - Early Permian carbonates, and Triassic sandstones. Finally, the exploration well was designed to fulfill the license's obligatory work program which committed the licensees to drill one wildcat well to test prospects down to rocks of Devonian age or 5000 m, whichever came first.
    Operations and results
    Exploration well 7121/1-1 was spudded on 10 October 1985 in 369 m water depth with the semi-submersible installation "Zapata Ugland". Due to NPD winter season regulations drilling was stopped at 916 m. Drilling of well 7121/1-1R commenced on 19 March 1986 and reached total depth of 5000 m in Late Carboniferous sediments of the Ørn Formation. The well was drilled with sea water and gel down to 1978 m, and with Sea water / gel / polymer from 1978 m to TD. Lost Circulation Material was used below 3370 m. Triassic rocks were encountered at 698 m, unconformably underlying 178 meters of Tertiary claystone and siltstone. The Triassic sediments (2295 m thick) consisted predominantly of very fine clastics with minor interbeds of sandstone, stringers of dolomite and limestone and traces of coal.
    Fair to poor hydrocarbon shows were encountered in some thin and tight sandstones of Late and Middle Triassic age. The only significant hydrocarbon show was encountered in a 11.5 m thick sandstone bed, between 1932.0 and 1943.5 m, where 18.7 % gas (C1 & C4) was measured by the gas detectors. The Paleozoic section (Permian - Late Carboniferous Ørn Formation) was encountered at 2993 m. The section, +2007 m thick, consists predominantly of carbonates (silicified limestones, limestones, dolomitic limestones, dolomitized limestones and dolomites) with minor interbeds of chert, siltstones and anhydrites.& Silicification, re-crystallization and dolomitization are common and only a few intervals show reasonably fair preservation of original depositional textures.
    The prognosed primary objective, Early Permian (Artinskian) mounded carbonate facies (biohermal build-ups), was encountered at 3765-3994 m (thickness 229 m). However, biostratigraphic analysis dates the interval as Late Gzhelian - Early Asselian. Only 12% of the carbonate rocks have porosities above 6.0 % (6.0 - 10.0 %). The porosity types recognized in these thin, widely spaced intervals are intercrystalline - interparticle, moldic and fracture porosities.
    No hydrocarbon shows were encountered while drilling the Paleozoic section and the interpretation of the wireline logs confirmed that the section is 100% water bearing.
    Wellsite and laboratory geochemical analyses of the sediments drilled indicated that the most significant source rock sequences were Early - Middle Triassic shales between 2200 and 2800 m. Source rocks of Permian age were not found. The well was permanently abandoned as a dry hole 23 August 1986.
    Testing
    No drill stem test was performed.

  • 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
    3137.5
    3138.5
    [m ]
    2
    3385.0
    3386.0
    [m ]
    3
    3511.0
    3513.7
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    4.7
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3137-3138m
    Core photo at depth: 3385-3386m
    Core photo at depth: 3511-3512m
    Core photo at depth:  
    Core photo at depth:  
    3137-3138m
    3385-3386m
    3511-3512m

  • 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
    518.0
    36
    526.5
    0.00
    LOT
    SURF.COND.
    20
    901.0
    22
    916.0
    1.51
    LOT
    INTERM.
    16
    1979.5
    17 1/2
    2154.0
    1.55
    LOT
    INTERM.
    11 3/4
    2784.0
    14 3/4
    2804.0
    1.46
    LOT
    OPEN HOLE
    5000.0
    10 5/8
    5000.0
    0.00
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    4ARM-CAL GR
    900
    2030
    4ARM-CAL GR
    1979
    2800
    CBL VDL
    395
    1979
    DIFL ACL CBL CNL CDL SP CAL GR
    2781
    5002
    DIFL ACL CNL CDL SP CAL GR
    1979
    2805
    DIFL ACLCNL CDL SP CAL GR
    900
    2152
    DIFL LSACL CDL SP CAL GR
    2781
    3368
    MWD DLWD
    900
    3368
    SWC
    938
    2123
    SWC
    2165
    2794
    SWC
    2795
    4995
    TEMP
    1800
    2750
    VSP
    800
    5000

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.74

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.93
    pdf
    1.96
    pdf
    1.97
    pdf
    1.70
    pdf
    0.79

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    591
    1.08
    9.0
    WATER BASED
    898
    1.08
    9.0
    WATER BASED
    922
    1.08
    8.0
    WATER BASED
    936
    1.08
    9.0
    WATER BASED
    965
    1.10
    8.0
    WATER BASED
    1121
    1.13
    10.0
    WATER BASED
    1131
    1.13
    13.0
    WATER BASED
    1207
    1.13
    8.0
    WATER BASED
    1244
    1.14
    10.0
    WATER BASED
    1260
    1.13
    10.0
    WATER BASED
    1280
    1.13
    10.0
    WATER BASED
    1292
    1.14
    13.0
    WATER BASED
    1337
    1.13
    9.0
    WATER BASED
    1423
    1.14
    13.0
    WATER BASED
    1487
    1.15
    14.0
    WATER BASED
    1515
    1.13
    9.0
    WATER BASED
    1527
    1.13
    9.0
    WATER BASED
    1576
    1.13
    9.0
    WATER BASED
    1618
    1.13
    10.0
    WATER BASED
    1650
    1.13
    10.0
    WATER BASED
    1672
    1.13
    10.0
    WATER BASED
    1700
    1.13
    14.0
    WATER BASED
    1711
    1.13
    11.0
    WATER BASED
    1739
    1.13
    10.0
    WATER BASED
    1760
    1.13
    12.0
    WATER BASED
    1815
    1.13
    10.0
    WATER BASED
    1835
    1.13
    12.0
    WATER BASED
    1884
    1.13
    8.0
    WATER BASED
    1907
    1.13
    12.0
    WATER BASED
    1925
    1.13
    8.0
    WATER BASED
    1933
    1.13
    10.0
    WATER BASED
    1942
    1.13
    11.0
    WATER BASED
    1960
    1.13
    10.0
    WATER BASED
    1993
    1.13
    10.0
    WATER BASED
    1994
    1.13
    11.0
    WATER BASED
    2039
    1.13
    11.0
    WATER BASED
    2056
    1.13
    11.0
    WATER BASED
    2064
    1.13
    8.0
    WATER BASED
    2107
    1.14
    9.0
    WATER BASED
    2113
    1.13
    13.0
    WATER BASED
    2115
    1.13
    9.0
    WATER BASED
    2120
    1.13
    10.0
    WATER BASED
    2152
    1.13
    8.0
    WATER BASED
    2153
    1.15
    8.0
    WATER BASED
    2154
    1.13
    13.0
    WATER BASED
    2175
    1.13
    8.0
    WATER BASED
    2231
    1.13
    10.0
    WATER BASED
    2236
    1.13
    10.0
    WATER BASED
    2350
    1.13
    15.0
    WATER BASED
    2407
    1.13
    14.0
    WATER BASED
    2518
    1.13
    14.0
    WATER BASED
    2555
    1.15
    12.0
    WATER BASED
    2620
    1.21
    15.0
    WATER BASED
    2663
    1.26
    17.0
    WATER BASED
    2702
    1.32
    19.0
    WATER BASED
    2721
    1.32
    20.0
    WATER BASED
    2804
    1.32
    20.0
    WATER BASED
    2817
    1.20
    14.0
    WATER BASED
    2845
    1.20
    14.0
    WATER BASED
    2900
    1.20
    14.0
    WATER BASED
    2967
    1.20
    10.0
    WATER BASED
    2987
    1.17
    11.0
    WATER BASED
    2998
    1.20
    14.0
    WATER BASED
    3056
    1.20
    13.0
    WATER BASED
    3117
    1.20
    15.0
    WATER BASED
    3138
    1.17
    10.0
    WATER BASED
    3138
    1.17
    11.0
    WATER BASED
    3140
    1.17
    11.0
    WATER BASED
    3181
    1.17
    11.0
    WATER BASED
    3205
    1.17
    11.0
    WATER BASED
    3310
    1.17
    13.0
    WATER BASED
    3370
    1.06
    4.0
    WATER BASED
    3386
    1.08
    11.0
    WATER BASED
    3460
    1.08
    12.0
    WATER BASED
    3479
    1.08
    10.0
    WATER BASED
    3513
    1.08
    12.0
    WATER BASED
    3684
    1.07
    8.0
    WATER BASED
    3924
    1.07
    10.0
    WATER BASED
    4116
    1.08
    11.0
    WATER BASED
    4299
    1.09
    12.0
    WATER BASED
    4406
    1.09
    12.0
    WATER BASED
    4469
    1.09
    11.0
    WATER BASED
    4695
    1.09
    11.0
    WATER BASED
    4887
    1.09
    12.0
    WATER BASED
    4988
    1.09
    12.0
    WATER BASED
    5000
    1.09
    10.0
    WATER BASED

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2797.0
    [m]
    DC
    FUGRO