Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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19.06.2024 - 01:33
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2/4-14 R

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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.
    2/4-14 R
    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
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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
    Well name
    Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.
    2/4-14
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    LINJE NS-5-235 & SP 585
    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.
    Saga Petroleum ASA
    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.
    593-L4
    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.
    334
    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,
    01.05.1989
    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.
    06.04.1990
    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.
    06.04.1992
    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.
    13.12.2005
    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.
    YES
    Reentry activity
    Reason for reentry of the wellbore. Only relevant for exploration wellbores. Example of legal values: DRILLING, DRILLING/PLUGGING, LOGGING, PLUGGING, TESTING, TESTING/PLUGGING.
    LOGGING
    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/GAS
    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.
    EARLY 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.
    MANDAL FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    38.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    68.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4746.0
    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).
    4745.0
    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 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.
    MANDAL FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    56° 41' 5.26'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 8' 43.08'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6282449.13
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    508901.59
    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.
    1440
  • Wellbore history

    General
    Well 2/4-14 R was designed to re-establish full well control of the uncontrolled flow in well 2/4-14 by using both well 2/4-14 R and 2/4-15 S. The RKB with Neddrill Trigon is 37 m, but all depths in this account are relative to the RKB of Treasure Saga (26 m) for easier comparison with other the well bores and re-entries involved in the blow out.
    Since the underground blow out occurred in well 2/4-14 in January 1989 various surveys and analyses had been conducted to monitor any flow of gas into shallow strata in the area. Gas bubbles from the site of the 2/4-13 well head were first time reported from ROV surveys in August 1989. A Sidescan Sonar Search was performed in the period from late June 1989 up to late March 1990. No gas leakage was detected by this method. A seismic surveillance study was performed in the 2/4-14 area by Read Well Services A/S in order to monitor the noise and acoustic activity caused by possible cracking due to migration of hydrocarbons into the shallow sand layers. Four seismometers were placed on the seafloor from 21 September to 2 October 1989. Analysis of these data proved seismic activity, possibly due to the pressure build-up and release of energy related to the hydrocarbon accumulation in the sand layers. Geochemical analyses of gas samples from wells 2/4-13, 2/4-14, and 2/4-15 were conducted. Variable mixes of shallow (biogenic) with deep reservoir (thermogenic) gasses were found in the samples, with the highest proportion of thermogenic gas in the depression of well 2/4-13. Seismic shallow anomalies corresponding to sands at 828, 492 and 445 m were mapped in March 1990, indicating recipients for leaking hydrocarbons.
    The 2/4-14 R well program covers the phase from where the 7" liner has been set, cemented, logged and successfully pressure tested in well 2/4-15 S.
    Operations and results
    Jack-up rig Neddrill Trigon arrived the 2/4-14 location on 21 March 1989. A sub sea snubbing BOP was installed on top of the Treasure Saga BOP (snubbing = forcing a pipe or tubular into a well against well bore pressure). The well was tied back to the jack-up rig with a high-pressure riser system. Two snubbing units (460 and 150 K) were used for high pressure snubbing operations during clean up, killing and plugging of the well. Pressure communication with the well was established on 1 May 1989. The sheared drill pipe was reconnected. A production logging tool (PLT) was run that indicated an underground flow of 18000 bbl/day down in the bore hole. The flow probably came up the annulus, or a hole in the drill pipe below 4000 m, and out a hole in the 9 5/8" casing around 1370 m.
    A noise log run in the relief well 2/4-15 S indicated a hole in the drill pipe of 2/4-14 at 4110 m. The drill pipe was then cut at 4062 m and snubbed out of hole. A taper mill was run down to a planned packer setting depth. This assembly became stuck at 3816 m, and while attempting to pull free, the drill pipe parted. The well flowed 1 minute through the drill pipe before the shear ram was activated leaving two fishes in the hole. A few days later the 9 5/8" casing parted at 869 m. The mechanical condition of the well steadily deteriorated after this, making further attempts to recover the bottom drill pipe fish difficult and time consuming.
    On 28 November 1989, the decision was made to utilize the relief well 2/4-15 S as the primary kill vehicle. To assist the operation, 3 1/2" tubing was snubbed in the well to a depth of 1469 m. A wire line PLT was run into the hole below the tubing to monitor the kill operation.
    The kill operation took place from 12 to 16 December 1989 after the relief well had successfully drilled into the 2/4-14 well bore at 4705 m TVD RKB. A 100 bbl barite pill was pumped from the relief well to plug the well at TD. After a 20" riser was installed, the 9 5/8" casing was cut and removed down to 881 m. A cement plug was set inside the 5" drill pipe before the pipe was cut at 3442 m, and 9 5/8" casing plugged back to 980 m. Cement was squeezed down 13 3/8" by 20" annulus, and plugs were then set inside 13 3/8" casing up to 140 m. Inspection with ROV immediately after completion found only sporadic gas leakage on the sea bed, and later ROV inspections after the borehole was permanently plugged and abandoned found no significant gas leakage.
    The well was suspended on 6 April 1990 for later re-entry and plugging with the semi-submersible rig Treasure Saga.
    Testing
    No drill stem test was performed.
  • 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
    40.13