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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25/8-13

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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.
    25/8-13
    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
    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.
    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.
    25/8-13
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    ES9403 xline 1935- inline 1644
    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.
    1023-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.
    21
    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,
    31.10.2001
    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.
    20.11.2001
    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.
    20.11.2003
    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.
    29.11.2003
    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
    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.
    18.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    127.6
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2276.0
    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).
    2276.0
    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 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.
    STATFJORD GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 21' 42.3'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 21' 48.1'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6580659.71
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    463806.57
    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.
    4438

  • Wellbore history
    General
    Well 25/8-13 was drilled on Production License 027B, near the Ringhorne and Jotun fields. The primary targets were the Early Paleocene Ty and Heimdal Formation sands.
    Operations and results
    Wildcat well 25/8-13 was spudded with the semi-submersible installation "West Alpha" on 31 October 2001 and drilled to TD at 2258 m in the Early Jurassic Statfjord Formation. The well was drilled with seawater and bentonite sweeps down to 1038 m and with "Versavert" oil based mud from 1038 m to TD.
    The Heimdal Formation sand was not developed in this well. The best reservoir sands were encountered in the Ty Formation from 2099 m to 2182.5 m and in the Statfjord Formation from 2235 m to TD. All reservoir sands in the well were found water bearing. An anomaly on the resistivity logs in the uppermost 3 m of the Ty reservoir section could indicate residual hydrocarbons in this interval, but this is not supported by other data and it is therefore believed that the anomaly is due to mud invasion from the OBM.
    Eleven pressure points were successfully collected with a TD MDT logging run in the Paleocene, Jurassic and Triassic. From this data it appears that the massive Ty Fm sands and the Jurassic Vestland Group lie on the same pressure gradient while the Statfjord sands are not in pressure communication, lying on a gradient at about 5 bars higher. No coring (sidewall or conventional) was undertaken in this well. No fluid samples were taken. The well was permanently abandoned on 20 November 2001 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]
    1040.00
    2276.00

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1830.0
    [m]
    DC
    APT
    1850.0
    [m]
    DC
    APT
    1904.0
    [m]
    DC
    APT
    1910.0
    [m]
    DC
    APT
    1920.0
    [m]
    DC
    APT
    1930.0
    [m]
    DC
    APT
    1960.0
    [m]
    DC
    APT
    1970.0
    [m]
    DC
    APT
    1980.0
    [m]
    DC
    APT
    1990.0
    [m]
    DC
    APT
    2000.0
    [m]
    DC
    APT
    2010.0
    [m]
    DC
    APT
    2020.0
    [m]
    DC
    APT
    2030.0
    [m]
    DC
    APT
    2040.0
    [m]
    DC
    APT
    2045.0
    [m]
    DC
    APT
    2051.0
    [m]
    DC
    APT
    2054.0
    [m]
    DC
    APT
    2063.0
    [m]
    DC
    APT
    2069.0
    [m]
    DC
    APT
    2075.0
    [m]
    DC
    APT
    2081.0
    [m]
    DC
    APT
    2090.0
    [m]
    DC
    APT
    2093.0
    [m]
    DC
    APT
    2096.0
    [m]
    DC
    APT
    2099.0
    [m]
    DC
    APT
    2102.0
    [m]
    DC
    APT
    2117.0
    [m]
    DC
    APT
    2140.0
    [m]
    DC
    APT
    2170.0
    [m]
    DC
    APT
    2180.0
    [m]
    DC
    APT
    2190.0
    [m]
    DC
    APT
    2200.0
    [m]
    DC
    APT
    2210.0
    [m]
    DC
    APT
    2220.0
    [m]
    DC
    APT
    2230.0
    [m]
    DC
    APT
    2240.0
    [m]
    DC
    APT
    2260.0
    [m]
    DC
    APT
    2276.0
    [m]
    DC
    APT

  • Lithostratigraphy

  • 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
    4.42
    .PDF
    0.67

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    DSI CSI GR
    295
    2269
    MDT GR
    2033
    2246
    MWD
    219
    219
    MWD - CDR GR
    219
    1038
    MWD - GR CDR CDN8
    1038
    2101
    MWD - GR CDR CDN8
    2020
    2075
    MWD - GR CDR CDN8
    2080
    2276

  • 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
    215.0
    36
    215.0
    0.00
    LOT
    SURF.COND.
    13 3/8
    1030.0
    17 1/2
    1030.0
    1.72
    LOT
    OPEN HOLE
    2276.0
    12 1/4
    2276.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    219
    1.03
    WBM
    610
    1.03
    WBM
    1038
    1.03
    WBM
    1038
    0.00
    OBM
    1072
    1.32
    23.0
    OBM
    1997
    1.32
    26.0
    SBM
    2101
    1.32
    21.0
    SBM
    2132
    1.32
    22.0
    SBM
    2276
    1.32
    22.0
    OBM

  • Pressure plots
    Pressure plots
    The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.
    Pressure plots
    Document name
    Document format
    Document size [MB]
    pdf
    0.22