Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
sodir.no    Norsk
sodir.no          Norsk
21.11.2024 - 01:28
Time of last synchronization with Norwegian Offshore Directorate's internal systems

2/8-8

Export: PDF icon PDF

  • General information
    General information
    Attribute Value
    Wellbore name
    Official name of wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    2/8-8
    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
    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
    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.
    2/8-8
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    LINE 75-19 SP.650
    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.
    Amoco Norway Oil Company
    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.
    143-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.
    127
    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,
    10.11.1975
    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.
    15.03.1976
    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.
    15.03.1978
    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.
    16.10.2012
    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.
    APPRAISAL
    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.
    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.
    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.
    LATE CRETACEOUS
    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.
    TOR 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.
    LATE CRETACEOUS
    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.
    HOD FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    25.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    70.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2667.0
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    77
    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 CRETACEOUS
    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.
    RØDBY FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    56° 16' 49.81'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 24' 12.71'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6237510.96
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    524985.88
    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.
    278

  • Wellbore history
    General
    Well 2/8-8 was drilled to appraise the Valhall discovery in the southern North Sea. The well is reference well for the Hod Formation.
    Operations and results
    Appraisal well 2/8-8 was spudded with the semi-submersible installation Deepsea Saga on 10 November 1975 and drilled to TD at 2667 m in the Early Cretaceous Rødby Formation. While running the 13 3/8-inch casing, returns (125 barrels) were lost while pumping plug. While cementing the 9 5/8-inch casing, the cement slurry was not properly displaced, and the casing was cemented back on the inside to 1022 m. Three days were lost due to this in drilling out the cement. Otherwise the well was drilled without significant problems. The well was drilled with sea water and hi-vis mud down to 169 m, with sea water/gel mud from 169 m to 402 m, and with lignosulphonate/gypsum mud from 402 m to TD.
    Oil shows were recorded at several levels above the chalk reservoir: 1320 - 1329 m had fair shows on siltstones; 1390 to 1426 m had poor shows in shales and limestone; 1512 to 1676 m had oil staining with fluorescence and cut in shales; and 2050 to 2400 m had poor to fair shows in thin stringers of limestone and dolomite. Top of the chalk reservoir, Tor Formation, was encountered at 2447. It was oil bearing and had shows down to 2591 m. No shows were recorded below 2591 m.
    At total of 47.7 m core was recovered in 14 cores from 2450 to 2600.9 m. The overall recovery was 39 %. No wire line fluid samples were taken.
    The well was permanently abandoned on 15 March 1978 as an oil appraisal well.
    Testing
    Tests were conducted over five intervals. Sand-water hydraulic fracture treatments were conducted on Tests 2, 3 and 4.
    Test 1 tested the interval 2585 to 2595 m towards the base of the Hod Formation. The well was opened for flow during 34.6 hrs. 3.8 m3 cushion water and unmeasured oil and gas were produced to surface while 8 m3 oil cut water was reversed out of the test string.
    Test 2 tested the interval 2556 to 2567.9 m in the Hod Formation. The test produced 455 Sm3 oil /day through a 48/64" choke. The GOR was 123 Sm3/Sm3.
    Test 3 tested the interval 2507 to 2514.9 m in the Hod Formation. The test produced on average180 Sm3 oil /day. The GOR was 139 Sm3/Sm3 and the oil gravity was 38.1 deg API. The test also produced solids, plugging the chokes and causing unstable flow.
    Test 4 tested the interval 2488 to 2492.7 m in the lower Tor Formation. The test produced 745 Sm3 oil /day through a 32/64" choke. The GOR was 218 Sm3/Sm3.
    Test 5 tested the interval 2460 to 2464.6 m in the Tor Formation. The test produced 1222 Sm3 oil /day with open choke. The GOR was 199 Sm3/Sm3 and the oil gravity was 35.2 deg API.

  • 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]
    168.86
    2667.00

  • 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
    8038.0
    8083.0
    [ft ]
    2
    8083.0
    8143.0
    [ft ]
    3
    8143.0
    8158.0
    [ft ]
    4
    8160.0
    8188.0
    [ft ]
    5
    8188.0
    8196.6
    [ft ]
    6
    8218.0
    8226.0
    [ft ]
    7
    8246.0
    8251.0
    [ft ]
    8
    8276.0
    8292.0
    [ft ]
    9
    8314.0
    8345.0
    [ft ]
    10
    8345.0
    8354.0
    [ft ]
    11
    8375.0
    8390.0
    [ft ]
    12
    8393.0
    8401.0
    [ft ]
    13
    8417.0
    8433.0
    [ft ]
    14
    8515.0
    8533.0
    [ft ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    86.1
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 8160-8166ft
    Core photo at depth: 8160-8166ft
    Core photo at depth: 8166-8172ft
    Core photo at depth: 8166-8172ft
    Core photo at depth: 8172-8177ft
    8160-8166ft
    8160-8166ft
    8166-8172ft
    8166-8172ft
    8172-8177ft
    Core photo at depth: 8172-8177ft
    Core photo at depth: 8177-8183ft
    Core photo at depth: 8177-8183ft
    Core photo at depth: 8183-8188ft
    Core photo at depth: 8183-8186ft
    8172-8177ft
    8177-8183ft
    8177-8183ft
    8183-8188ft
    8183-8186ft
    Core photo at depth: 8188-8190ft
    Core photo at depth: 8188-8190ft
    Core photo at depth: 8190-8196ft
    Core photo at depth: 8190-8196ft
    Core photo at depth: 8218-8224ft
    8188-8190ft
    8188-8190ft
    8190-8196ft
    8190-8196ft
    8218-8224ft
    Core photo at depth: 8218-8224ft
    Core photo at depth: 8224-8226ft
    Core photo at depth: 8224-8226ft
    Core photo at depth: 8246-8251ft
    Core photo at depth: 8246-8251ft
    8218-8224ft
    8224-8226ft
    8224-8226ft
    8246-8251ft
    8246-8251ft
    Core photo at depth: 8276-8280ft
    Core photo at depth: 8276-8280ft
    Core photo at depth: 8314-8320ft
    Core photo at depth: 8314-8320ft
    Core photo at depth: 8320-8326ft
    8276-8280ft
    8276-8280ft
    8314-8320ft
    8314-8320ft
    8320-8326ft
    Core photo at depth: 8320-8326ft
    Core photo at depth: 8326-8332ft
    Core photo at depth: 8326-8332ft
    Core photo at depth: 8332-8338ft
    Core photo at depth: 8332-8338ft
    8320-8326ft
    8326-8332ft
    8326-8332ft
    8332-8338ft
    8332-8338ft
    Core photo at depth: 8338-8344ft
    Core photo at depth: 8338-8344ft
    Core photo at depth: 8338-8345ft
    Core photo at depth: 8344-8345ft
    Core photo at depth: 8345-8351ft
    8338-8344ft
    8338-8344ft
    8338-8345ft
    8344-8345ft
    8345-8351ft
    Core photo at depth: 8345-8351ft
    Core photo at depth: 8351-8354ft
    Core photo at depth: 8351-8354ft
    Core photo at depth: 8375-8381ft
    Core photo at depth: 8375-8381ft
    8345-8351ft
    8351-8354ft
    8351-8354ft
    8375-8381ft
    8375-8381ft
    Core photo at depth: 8381-8387ft
    Core photo at depth: 8381-8387ft
    Core photo at depth: 8387-8390ft
    Core photo at depth: 8387-8390ft
    Core photo at depth: 8393-8399ft
    8381-8387ft
    8381-8387ft
    8387-8390ft
    8387-8390ft
    8393-8399ft
    Core photo at depth: 8393-8399ft
    Core photo at depth: 8399-8401ft
    Core photo at depth: 8399-8401ft
    Core photo at depth: 8417-8423ft
    Core photo at depth: 8417-8423ft
    8393-8399ft
    8399-8401ft
    8399-8401ft
    8417-8423ft
    8417-8423ft
    Core photo at depth: 8423-8429ft
    Core photo at depth: 8423-8429ft
    Core photo at depth: 8429-8433ft
    Core photo at depth: 8429-8433ft
    Core photo at depth: 8515-8521ft
    8423-8429ft
    8423-8429ft
    8429-8433ft
    8429-8433ft
    8515-8521ft
    Core photo at depth: 8515-8521ft
    Core photo at depth: 8521-8527ft
    Core photo at depth: 8521-8527ft
    Core photo at depth: 8527-8533ft
    Core photo at depth: 8527-8533ft
    8515-8521ft
    8521-8527ft
    8521-8527ft
    8527-8533ft
    8527-8533ft

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    95
    1536
    2409
    2409
    2419
    2429
    2447
    2447
    2494
    2601
    2603
    2619
    2619

  • 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
    1.29
    pdf
    31.99

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    2585
    2595
    0.0
    2.0
    2556
    2568
    19.0
    3.0
    2507
    2515
    0.0
    4.0
    2488
    2493
    12.5
    5.0
    2460
    2465
    25.4
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    2.0
    43.000
    32.000
    3.0
    44.600
    23.300
    4.0
    5.0
    44.000
    36.000
    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
    2.0
    455
    690
    3.0
    179
    0.830
    780
    4.0
    745
    1225
    5.0
    1222
    0.850
    1118

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL
    100
    610
    CBL
    2095
    2400
    CBL VDL
    2252
    2637
    CBL VDL GR CAL
    2416
    2667
    DIP
    2412
    2666
    DLL MSFL GR SP CAL
    2413
    2660
    FDC CNL GR CAL
    2413
    2668
    FDL CNL GR CAL
    100
    2426
    GR SON CAL
    1285
    2423
    GR SON CAL
    2413
    2664
    IES SP
    1287
    2426
    IES SP
    2413
    2668
    VELOCITY
    1285
    2423
    VELOCITY
    2413
    2664

  • 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
    169.0
    36
    169.0
    0.00
    LOT
    SURF.COND.
    20
    380.0
    26
    388.0
    1.31
    LOT
    INTERM.
    13 3/8
    1285.0
    17 1/2
    1295.0
    2.11
    LOT
    INTERM.
    9 5/8
    2411.0
    12 1/4
    2419.0
    1.97
    LOT
    LINER
    7
    2659.0
    8 1/2
    2667.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    380
    1.11
    waterbased
    1284
    1.23
    waterbased
    2410
    1.80
    waterbased
    2445
    1.85
    waterbased