Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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21.11.2024 - 01:28
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25/10-7 S

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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.
    25/10-7 S
    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.
    25/10-7
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    ESD 96-28 & SP 353- ESD 96-15 & SP 312
    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.
    840-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.
    20
    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,
    20.05.1996
    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.
    08.06.1996
    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.
    08.06.1998
    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.
    29.08.2003
    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.
    25.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    117.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2617.0
    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).
    2582.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    25.8
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    87
    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.
    PALEOCENE
    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.
    EKOFISK FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    59° 4' 57.64'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 8' 23.75'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6549726.89
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    450703.95
    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.
    2769

  • Wellbore history
    General
    Well 25/10-7 S is located southwest of the Balder area. The primary objective of the well was to evaluate resource potential in the Paleocene Heimdal Formation in the Bjørn Prospect. Secondary objective was to evaluate resource potential in the Lower Eocene interval based on a high amplitude seismic response.
    Operations and results
    Exploration well 25/10-7 S was spudded with the semi-submersible installation "Vildkat Explorer" on 20 May 1996 and drilled to TD at 2617 m (2582 m TVD) in the Early Paleocene Ekofisk Formation. The well was drilled with seawater and bentonite down to 1102 m and with "ANCOVERT" oil based mud from 1102 m to TD. The well was drilled deviated to avoid shallow gas at a depth of 512-822 meters below sea level close to the proposed location. The surface location of 25/10-7 S was moved approximately 200 m south of the reservoir target location, and no shallow gas was seen at this location. The well was drilled vertically to 1165 m where angle was gradually built to max 25.8 degrees and then again reduced to 1& at 2000 m. Well time for 25/10-7 S was 19.78 days (vs. 31 days targeted) for $4.7 M (vs. an AFE of $6.7 M). A major contribution to the reduced time and cost was a reduction of the electric logging program from the planned 4 days to the actual of 0.6 days due to a labour dispute involving key service companies in Norway. A 233 m thick Heimdal Formation was penetrated by the well, starting at 2238 m. The secondary, Eocene target was a 22 m thick limestone. The plan was to cut one core in the top of the Heimdal sand, regardless of hydrocarbon shows. Coring continued after core no.2 based on shows described at well site. A total of five cores were cut from 2200-2378 m from the Lista Formation through a complete Heimdal sequence and into the Lista Formation again. Subsequent to the coring MWD logs reamed across cored interval showed reservoir to be water wet. In the end onshore geochemical analyses identified the core "shows" as contamination from the mud. In addition to the MWD GR-AIT-LDT-CNL-Array Sonic and VSP was run. The wire line logs showed a dry hole. The work program also had SWC's and MDT pressures and one sample planned, but as the wire line logs confirmed a dry hole, it was decided to abort the planned program and plug the well. The well was permanently abandoned as a dry well on June 8, 1996.
    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]
    1110.00
    2617.00

  • 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
    2200.0
    2230.3
    [m ]
    2
    2232.0
    2269.2
    [m ]
    3
    2269.2
    2306.7
    [m ]
    4
    2306.7
    2342.4
    [m ]
    5
    2342.4
    2380.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    178.3
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 2200-2205m
    Core photo at depth: 2205-2210m
    Core photo at depth: 2210-2215m
    Core photo at depth: 2215-2220m
    Core photo at depth: 2220-2225m
    2200-2205m
    2205-2210m
    2210-2215m
    2215-2220m
    2220-2225m
    Core photo at depth: 2225-2230m
    Core photo at depth: 2230-2230m
    Core photo at depth: 2232-2237m
    Core photo at depth: 2237-2242m
    Core photo at depth: 2242-2247m
    2225-2230m
    2230-2230m
    2232-2237m
    2237-2242m
    2242-2247m
    Core photo at depth: 2247-2252m
    Core photo at depth: 2252-2257m
    Core photo at depth: 2257-2262m
    Core photo at depth: 2262-2267m
    Core photo at depth: 2267-2269m
    2247-2252m
    2252-2257m
    2257-2262m
    2262-2267m
    2267-2269m
    Core photo at depth: 2269-2274m
    Core photo at depth: 2274-2279m
    Core photo at depth: 2279-2284m
    Core photo at depth: 2284-2289m
    Core photo at depth: 2289-2294m
    2269-2274m
    2274-2279m
    2279-2284m
    2284-2289m
    2289-2294m
    Core photo at depth: 2294-2299m
    Core photo at depth: 2299-2304m
    Core photo at depth: 2304-2307m
    Core photo at depth: 2307-2311m
    Core photo at depth: 2311-2316m
    2294-2299m
    2299-2304m
    2304-2307m
    2307-2311m
    2311-2316m
    Core photo at depth: 2316-2321m
    Core photo at depth: 2321-2326m
    Core photo at depth: 2326-2331m
    Core photo at depth: 2331-2336m
    Core photo at depth: 2336-2341m
    2316-2321m
    2321-2326m
    2326-2331m
    2331-2336m
    2336-2341m
    Core photo at depth: 2341-2342m
    Core photo at depth: 2342-2347m
    Core photo at depth: 2347-2352m
    Core photo at depth: 2352-2357m
    Core photo at depth: 2357-2362m
    2341-2342m
    2342-2347m
    2347-2352m
    2352-2357m
    2357-2362m
    Core photo at depth: 2362-2367m
    Core photo at depth: 2367-2372m
    Core photo at depth: 2372-2377m
    Core photo at depth: 2377-2380m
    Core photo at depth:  
    2362-2367m
    2367-2372m
    2372-2377m
    2377-2380m

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    0.49

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    1.76

  • 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
    1.94
    pdf
    121.79

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    AIT AS LDT CNL GR
    1085
    2592
    MWD - GR EWR4 DIR
    250
    2605
    VSP GR
    1370
    2515

  • 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
    SURF.COND.
    30
    202.0
    36
    203.0
    0.00
    LOT
    INTERM.
    9 5/8
    1085.0
    12 1/4
    1086.0
    0.00
    LOT
    OPEN HOLE
    2617.0
    8 1/2
    2617.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    985
    1.39
    43.0
    OIL BASED
    1102
    1.37
    32.0
    OIL BASED
    1710
    0.17
    47.0
    OIL BASED
    2200
    1.37
    43.0
    OIL BASED
    2230
    0.17
    37.0
    OIL BASED
    2265
    1.39
    41.0
    OIL BASED
    2306
    1.37
    41.0
    OIL BASED
    2380
    1.38
    34.0
    OIL BASED
    2504
    1.37
    35.0
    OIL BASED
    2547
    1.38
    36.0
    OIL BASED
    2617
    1.39
    40.0
    OIL BASED