Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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10.05.2024 - 01:33
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2/8-13

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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.
    2/8-13
    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
    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.
    2/8-13
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    ANO 8701 - 36 SP 310
    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.
    607-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.
    55
    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,
    29.04.1989
    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.
    22.06.1989
    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.
    22.06.1991
    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.
    27.02.2004
    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.
    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.
    25.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    68.7
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    1940.0
    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).
    1939.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    5.4
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    96
    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 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.
    ZECHSTEIN GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    56° 23' 21.65'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 23' 57.58'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6249624.57
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    524655.38
    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.
    1383

  • Wellbore history
    General
    Exploration well 2/8-13 was designed to test the Tertiary and Upper Cretaceous chalks overlying a salt induced domal feature, unofficially named Mode, in the western part of block 2/8. The objectives were to test the possible hydrocarbon accumulation contained within the Tertiary and Upper Cretaceous chalks of the Ekofisk, Tor and Hod Formations; to determine the reservoir quality of the Shetland Group over the structure; to determine the chalk stratigraphy over the Mode salt dome; and to acquire a VSP to help to image the chalk distribution and thickness over the Mode feature.
    The well was planned to penetrate the Shetland Group on a structurally high at the northern flank of the Mode salt feature. Shallow gas was expected at 507- 590- and 730 m.
    Operations
    Wildcat well 2/8-13 was spudded with the semi-submersible installation Dyvi Stena on 28 April 1989 and drilled to TD at 1940 m in the Permian Zechstein Group. The well was drilled with seawater / gel / polymer down to 380 m, with PHPA/PAC mud from 380 m to 1253 m, with PHPA/PAC/ANCOMEL mud from 1253 m to 1457 m, with PHPA/PAC/NaCl mud from 1457 to 1758 m, and with NaCl/PAC mud from 1758 m to TD. Shallow gas was encountered at the prognosed depths, and controlled with heavy mud. Shallow gas encountered in sands at 828 m, caused the well to flow. The flow was killed with heavy mud, and caused no injuries or damages. The drill pipe got stuck, and had to be shot of above the BHA, which than was cemented in. The well was kicked off for the 2/8-13 sidetrack at 412 m.
    The Paleocene section was thinner than expected, with Balder Sele and part of the Lista Formations missing. The gas cloud above the structure caused some difficulties as to predicting formation depths and velocity correlations across the structure. The well drilled directly from Upper Cretaceous to Permian rocks. The Shetland Group came in 220 m higher than prognosed and was 9.5 m thick, compared to prognosed 270 m. No biostratigraphic evidence for the Hod, Blodøks, or Hidra Formations was found, nor of the Lower Cretaceous, Jurassic, or Triassic rocks. Shows were observed on cuttings and sidewall cores throughout the well below 700 m. An unexpected section of Celestite (strontium sulphate) was on top of the Anhydrite section. One core was cut from 1780 m to 1782 m in the Celestite section with poor reservoir quality. Good shows were recorded on the core. After having cut the core, the well became unstable and was killed and cemented back to 1415 m and an unintentional sidetrack was made. The Paleocene section came in 10 m deeper in the redrilled hole. No fluid sample was taken in. Well 2/8-13 was permanently abandoned 22 June 1989 as a dry hole with oil and gas shows.
    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]
    380.00
    1921.00

  • 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
    1780.0
    1782.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    2.0
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 1780-1782m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    1780-1782m

  • Lithostratigraphy
    Lithostratigraphy
    Top depth [mMD RKB]
    Lithostrat. unit
    94
    730
    1215
    1760
    1760
    1763
    1766
    1766
    1773
    1775

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.22

  • 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
    24.20

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL GR
    925
    1300
    CST
    1760
    1924
    DIL BHC GR SP
    1237
    1455
    DLL BHC GR SP
    1449
    1753
    DLL SDT GR SP
    1757
    1936
    LDL CNL GR CAL
    1237
    1457
    LDL CNL GR CAL
    1449
    1757
    LDL CNL GR CAL
    1757
    1939
    LDL LSS GR CAL
    178
    380
    MWD - GR RES DIR
    94
    824
    MWD - GR RES DIR
    412
    1780
    SHDT GR
    1449
    1758
    SHDT GR
    1757
    1934
    VSP
    260
    1800

  • 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
    178.0
    36
    183.0
    0.00
    LOT
    INTERM.
    20
    374.0
    26
    380.0
    1.60
    LOT
    INTERM.
    13 3/8
    1238.8
    17 1/2
    1255.0
    1.85
    LOT
    INTERM.
    9 5/8
    1449.0
    12 1/4
    1457.0
    1.98
    LOT
    LINER
    7
    1757.0
    8 1/2
    1783.0
    2.18
    LOT
    OPEN HOLE
    1940.0
    5 7/8
    1940.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    157
    1.82
    33.0
    4.8
    WATER BASED
    30.05.1989
    276
    1.20
    WATER BASED
    03.05.1989
    323
    1.20
    WATER BASED
    03.05.1989
    323
    1.20
    WATER BASED
    03.05.1989
    332
    1.20
    WATER BASED
    03.05.1989
    380
    1.20
    WATER BASED
    03.05.1989
    380
    1.20
    WATER BASED
    08.05.1989
    380
    1.20
    7.0
    3.8
    WATER BASED
    08.05.1989
    610
    1.38
    16.0
    2.9
    WATER BASED
    16.05.1989
    642
    1.20
    14.0
    5.3
    WATER BASED
    09.05.1989
    828
    1.33
    13.0
    4.8
    WATER BASED
    09.05.1989
    828
    1.33
    12.0
    4.3
    WATER BASED
    09.05.1989
    828
    1.33
    11.0
    4.8
    WATER BASED
    09.05.1989
    828
    1.33
    15.0
    8.1
    WATER BASED
    10.05.1989
    828
    1.33
    11.0
    3.4
    WATER BASED
    11.05.1989
    832
    1.50
    17.0
    5.7
    WATER BASED
    16.05.1989
    906
    1.54
    17.0
    5.7
    WATER BASED
    18.05.1989
    993
    1.54
    22.0
    4.3
    WATER BASED
    18.05.1989
    1204
    1.56
    18.0
    9.1
    WATER BASED
    18.05.1989
    1204
    1.58
    21.0
    3.8
    WATER BASED
    19.05.1989
    1255
    1.61
    27.0
    7.7
    WATER BASED
    19.05.1989
    1255
    1.62
    24.0
    5.7
    WATER BASED
    19.05.1989
    1255
    1.61
    21.0
    5.7
    WATER BASED
    23.05.1989
    1255
    1.61
    23.0
    6.7
    WATER BASED
    23.05.1989
    1255
    1.61
    21.0
    5.7
    WATER BASED
    23.05.1989
    1257
    1.68
    18.0
    8.6
    WATER BASED
    23.05.1989
    1260
    1.80
    23.0
    2.4
    WATER BASED
    25.05.1989
    1457
    1.82
    33.0
    9.6
    WATER BASED
    25.05.1989
    1457
    1.82
    34.0
    9.6
    WATER BASED
    26.05.1989
    1457
    1.85
    34.0
    5.3
    WATER BASED
    30.05.1989
    1524
    1.89
    31.0
    6.2
    WATER BASED
    30.05.1989
    1682
    1.89
    34.0
    8.6
    WATER BASED
    30.05.1989
    1780
    1.87
    27.0
    3.8
    WATER BASED
    31.05.1989
    1783
    1.85
    27.0
    2.9
    WATER BASED
    02.06.1989
    1783
    1.85
    24.0
    2.9
    WATER BASED
    05.06.1989
    1783
    1.87
    22.0
    2.9
    WATER BASED
    05.06.1989
    1783
    1.87
    27.0
    3.8
    WATER BASED
    05.06.1989
    1783
    1.86
    33.0
    6.7
    WATER BASED
    06.06.1989
    1783
    1.88
    39.0
    9.1
    WATER BASED
    07.06.1989
    1783
    1.88
    36.0
    7.2
    WATER BASED
    08.06.1989
    1783
    1.88
    32.0
    7.2
    WATER BASED
    09.06.1989
    1783
    1.87
    37.0
    8.1
    WATER BASED
    13.06.1989
    1783
    1.87
    37.0
    8.1
    WATER BASED
    13.06.1989
    1783
    1.68
    21.0
    3.3
    WATER BASED
    13.06.1989
    1783
    1.87
    28.0
    4.8
    WATER BASED
    01.06.1989
    1790
    1.78
    34.0
    3.8
    WATER BASED
    14.06.1989
    1800
    1.78
    38.0
    4.8
    WATER BASED
    14.06.1989
    1817
    1.78
    39.0
    5.3
    WATER BASED
    15.06.1989
    1908
    1.78
    36.0
    5.3
    WATER BASED
    16.06.1989
    1940
    1.78
    38.0
    5.8
    WATER BASED
    19.06.1989
    1940
    1.78
    36.0
    5.8
    WATER BASED
    19.06.1989
    1940
    1.78
    33.0
    5.8
    WATER BASED
    19.06.1989
    1940
    1.78
    33.0
    6.3
    WATER BASED
    20.06.1989
    1940
    0.00
    WATER BASED
    21.06.1989
    1940
    0.00
    WATER BASED
    23.06.1989
    1940
    0.00
    WATER BASED
    23.06.1989