Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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31.10.2024 - 01:27
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30/9-B-18 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.
    30/9-B-18 A
    Type
    Wellbore type. Legal values: EXPLORATION, DEVELOPMENT, OTHER (see 'Purpose' for more information)
    DEVELOPMENT
    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).
    PRODUCTION
    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.
    PLUGGED
    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
    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.
    30/9-B-18
    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.
    Norsk Hydro Produksjon 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.
    741-P
    Drilling facility
    Norwegian Offshore Directorate's name of the facility which the wellbore was drilled from.
    Production facility
    The Norwegian Offshore Directorate's name for the production facility, for development wells.
    OSEBERG B
    Drilling days
    Number of days from wellbore entry to wellbore completion.
    27
    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,
    27.09.1992
    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.
    23.10.1992
    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.
    23.10.1994
    Plugged date
    Date when plugging operations was finished, as reported by the operator to the Norwegian Offshore Directorate through DDRS (Daily Drilling Reporting System).
    14.10.2016
    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.
    12.09.2023
    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.
    PRODUCTION
    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.
    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.
    OSEBERG FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    58.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    109.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4982.0
    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).
    2761.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    93.4
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    106
    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.
    MIDDLE JURASSIC
    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.
    NESS FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 29' 36.31'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 49' 43.22'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6706534.38
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    490585.93
    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.
    2016
  • Wellbore history

    General
    Well 30/9-B-18 A is a production side-track from observation well 30/9-B-18 on the 30/9-1 Oseberg Discovery in the North Sea. The main objective for Well 30/9-B-18A was oil production from a planned 1200 metres horizontal section in the Oseberg, Etive and Lower Ness Formations.
    The NSO-1 geochemical standard oil was produced from 30/9-B-18 A.
    Operations and results
    Development well 30/9-B-18 A was kicked off at 3344 m in well 30/9-B-18 on 26 September 1992. It was drilled from the Oseberg B platform to TD at 4982 m (2761 m TVD) m in the Middle Jurassic Ness Formation. The target of the well was on the Oseberg Alpha Structure approximately 3 km south-east of the Oseberg B platform. It was drilled horizontally (between 88 and 93 deviation) from ca 3850 m in the Oseberg Formation To TD at 4982 m in the Ness Formation. The well was drilled with oil based Safemul mud from kick-off to TD.
    Total drilled length of Oseberg, Etive and Lower Ness in the horizontal well is ca 1130 m, in line with the prognosed 1200 metres.
    No cores were cut in this well. No wireline pressures were taken, and no wireline fluid sample was taken.
    The well was completed as a producer on 8 December 1992.
    Testing
    The well was completed with 15 perforation intervals between 3831 m and 4912 m (2762.2 m TVD and 2759.5 m TVD) in the horizontal sections in the lower Ness and Oseberg-Rannoch-Etive (ORE) formations. Production testing measured flow rates between 2510 and 2640 Sm3/day. Static pressure was 267.68 bar. Initial formation temperature at top perforations was 106.5 C.
    On 25 June 1994 ca 1200 litres of depressurized oil was produced, bottled and shipped to the NPD, where it is available as the North Sea Oil-1 (NSO-1) analytical standard for geochemical analysis. Further information about the oil is available upon application to the NPD.
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CET CBL VDL GR CCL
    3157
    4884
    MWD - DEN NEU
    3600
    4982
    MWD - DG DPR
    3340
    4982
  • Lithostratigraphy

  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    500
    1.20
    34.0
    8.0
    OIL BASED
    06.10.1992
    2788
    1.21
    38.0
    8.0
    OIL BASED
    19.10.1992
    3188
    1.20
    32.0
    8.5
    OIL BASED
    26.10.1992
    3344
    1.20
    36.0
    6.0
    OIL BASED
    28.09.1992
    3410
    1.20
    33.0
    8.0
    OIL BASED
    02.10.1992
    3437
    1.20
    40.0
    7.5
    OIL BASED
    28.09.1992
    3696
    1.20
    39.0
    8.0
    OIL BASED
    29.09.1992
    3927
    1.20
    35.0
    9.0
    OIL BASED
    30.09.1992
    3928
    1.20
    34.0
    9.0
    OIL BASED
    01.10.1992
    4175
    1.20
    35.0
    8.5
    OIL BASED
    06.10.1992
    4180
    1.20
    35.0
    10.0
    OIL BASED
    07.10.1992
    4181
    1.20
    36.0
    9.5
    OIL BASED
    06.10.1992
    4182
    1.20
    36.0
    9.5
    OIL BASED
    09.10.1992
    4214
    1.20
    34.0
    7.5
    OIL BASED
    09.10.1992
    4214
    1.20
    34.0
    8.0
    OIL BASED
    12.10.1992
    4427
    1.20
    32.0
    8.5
    OIL BASED
    12.10.1992
    4484
    1.20
    36.0
    6.5
    OIL BASED
    21.10.1992
    4568
    1.20
    36.0
    6.5
    OIL BASED
    12.10.1992
    4599
    1.20
    35.0
    7.0
    OIL BASED
    13.10.1992
    4625
    1.20
    37.0
    6.5
    OIL BASED
    20.10.1992
    4738
    1.20
    35.0
    7.0
    OIL BASED
    14.10.1992
    4757
    1.20
    35.0
    7.5
    OIL BASED
    16.10.1992
    4903
    1.20
    34.0
    8.5
    OIL BASED
    27.10.1992
    4908
    1.22
    37.0
    8.5
    OIL BASED
    29.10.1992
    4950
    1.20
    38.0
    8.0
    OIL BASED
    23.10.1992
    4970
    1.20
    38.0
    7.0
    OIL BASED
    19.10.1992
    4982
    1.20
    38.0
    7.0
    OIL BASED
    26.10.1992
    4982
    1.20
    39.0
    8.0
    OIL BASED
    26.10.1992