Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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7/12-3 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.
    7/12-3 A
    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).
    APPRAISAL
    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
    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.
    7/12-3
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    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.
    BP Norway Limited U.A.
    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.
    191-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.
    95
    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,
    04.06.1977
    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.
    06.09.1977
    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.
    06.09.1979
    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.
    13.08.2015
    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.
    APPRAISAL
    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.
    OIL 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.
    71.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    4191.0
    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).
    4011.0
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    163
    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.
    57° 6' 24.54'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 48' 41.56'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6329434.14
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    488583.99
    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.
    297

  • Wellbore history
    General
    Well 7/12-3 A is a geological sidetrack to 7/12-3 on the western flank of the 7/12-2 Ula discovery in the North Sea. The primary objective was to establish the oil-water level in the Ula structure.
    The well is type well for the Mandal Formation.
    Operations and results
    On 4 June 1977 appraisal well 7/12-3 A was kicked off from below the 13 3/8” casing shoe in well 7/12-3 at a depth of 1720. The semi-submersible installation Norskald drilled the well to TD at 4191 m (4011 m TVD) in the Permian Zechstein Group.
    Well 7/12-3A penetrated the reservoir at 3638.5 (3506.8 m TVD). The cores showed oil staining, cut and fluorescence. Wire line logs and testing showed this to be immovable oil, and indicated an oil water transition zone to a depth of 3693.5. (3555.3 m TVD). One hundred and eighty-nine meters of Ula Formation reservoir were encountered representing a true thickness of 168.9 m, and a net to gross ratio of 0.83 assuming a 10% porosity cut off on the computer-processed log.
    Seven full hole cores were cut from 3642.0 to 3730.0 m. RFT fluid samples were taken at 3675.5 m (salt water and mud filtrate) and 3688.5 m (salt water with traces of gas and oil/oil-water emulsion).
    The well was permanently abandoned on 6 September 1977 as a dry well with shows.
    Testing
    DST 1 tested the interval 3771.0 to 3715.5m. The test flowed 192 m3 saline formation water /day through a 32/64 choke. The DST temperature was 146.7 °C.
    DST 2 teste the interval 3680.0 to 3669.5 m. The test flowed 509 m3 saline formation water with trace oil /day through a 32/64 choke. The DST temperature was 145.6 °C.

  • Cuttings at the Norwegian Offshore Directorate
    Cuttings at the Norwegian Offshore Directorate
    Cuttings available for sampling?
    NO
    Cuttings at the Norwegian Offshore Directorate
    Cutting sample, top depth [m]
    Cutting samples, bottom depth [m]
    1730.00
    4114.00

  • 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
    3642.5
    3660.0
    [m ]
    2
    3660.0
    3678.3
    [m ]
    3
    3678.3
    3692.2
    [m ]
    4
    3692.2
    3697.6
    [m ]
    5
    3697.6
    3698.0
    [m ]
    6
    3700.0
    3718.0
    [m ]
    7
    3718.0
    3730.0
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    85.5
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3642-3647m
    Core photo at depth: 3647-3652m
    Core photo at depth: 3652-3657m
    Core photo at depth: 3657-3660m
    Core photo at depth: 3660-3665m
    3642-3647m
    3647-3652m
    3652-3657m
    3657-3660m
    3660-3665m
    Core photo at depth: 3665-3670m
    Core photo at depth: 3670-3675m
    Core photo at depth: 3675-3678m
    Core photo at depth: 3678-3683m
    Core photo at depth: 3683-3688m
    3665-3670m
    3670-3675m
    3675-3678m
    3678-3683m
    3683-3688m
    Core photo at depth: 3688-3692m
    Core photo at depth: 3697-3698m
    Core photo at depth: 3697-3698m
    Core photo at depth: 3700-3705m
    Core photo at depth: 3705-3710m
    3688-3692m
    3697-3698m
    3697-3698m
    3700-3705m
    3705-3710m
    Core photo at depth: 3710-3713m
    Core photo at depth: 3710-3715m
    Core photo at depth: 3715-3718m
    Core photo at depth: 3718-3723m
    Core photo at depth: 3723-3728m
    3710-3713m
    3710-3715m
    3715-3718m
    3718-3723m
    3723-3728m
    Core photo at depth: 3728-3730m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    3728-3730m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    3451.0
    [m]
    DC
    OD
    3460.0
    [m]
    DC
    OD
    3469.0
    [m]
    DC
    OD
    3481.0
    [m]
    DC
    OD
    3490.0
    [m]
    DC
    OD
    3499.0
    [m]
    DC
    OD
    3505.0
    [m]
    DC
    OD
    3511.0
    [m]
    DC
    OD
    3514.0
    [m]
    DC
    OD
    3520.0
    [m]
    DC
    OD
    3526.0
    [m]
    DC
    OD
    3529.0
    [m]
    DC
    OD
    3535.0
    [m]
    DC
    OD
    3541.0
    [m]
    DC
    OD
    3544.0
    [m]
    DC
    OD
    3550.0
    [m]
    DC
    OD
    3556.0
    [m]
    DC
    OD
    3559.0
    [m]
    DC
    OD
    3571.0
    [m]
    DC
    OD
    3580.0
    [m]
    DC
    OD
    3589.0
    [m]
    DC
    OD
    3601.0
    [m]
    DC
    OD

  • Lithostratigraphy

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.27

  • 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
    2.32
    pdf
    7.06
    pdf
    13.26

  • Drill stem tests (DST)
    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    3771
    3716
    0.0
    2.0
    3673
    3662
    0.0
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    2.0
    Drill stem tests (DST)
    Test number
    Oil
    [Sm3/day]
    Gas
    [Sm3/day]
    Oil density
    [g/cm3]
    Gas grav. rel.air
    GOR
    [m3/m3]
    1.0
    2.0

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL
    1600
    2500
    CBL
    1600
    2500
    CBL VDL GR CCL
    3395
    4105
    CST
    3260
    3585
    CST
    3605
    4125
    DLL RXO GR SP CAL
    3599
    3827
    FDC CNL GR
    3773
    4130
    FDC CNL GR CAL
    3599
    3827
    ISF BHC GR SP
    1681
    3586
    ISF BHC GR SP
    3599
    4016
    ISF BHC GR SP
    3599
    3825
    ISF BHC GR SP
    3766
    4188
    RFT
    3626
    4080
    RFT
    3650
    3897
    RFT
    3675
    0
    RFT
    3688
    0
    TEMP
    1650
    1979
    WST
    1720
    4188

  • 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
    169.0
    36
    174.0
    0.00
    SURF.COND.
    20
    466.0
    26
    470.0
    0.00
    INTERM.
    13 3/8
    1679.0
    17 1/2
    1686.0
    0.00
    INTERM.
    9 5/8
    3601.0
    12 1/2
    3612.0
    0.00
    OPEN HOLE
    4190.0
    8 1/2
    4190.0
    0.00

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    1720
    1.45
    waterbased
    2048
    1.46
    waterbased
    2838
    1.45
    waterbased
    3346
    1.45
    waterbased
    3612
    1.46
    waterbased

  • 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