Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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01.11.2024 - 01:26
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2/7-25 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.
    2/7-25 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).
    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
    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.
    2/7-25
    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.
    Phillips Petroleum Company Norway
    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.
    657-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.
    123
    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,
    29.11.1990
    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.
    31.03.1991
    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.
    31.03.1993
    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.
    05.12.2012
    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
    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.
    29.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    70.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    5177.0
    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).
    4560.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    37.6
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    155
    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.
    DEVONIAN
    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.
    NO GROUP DEFINED
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    56° 19' 59.69'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 14' 53.9'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6243336.31
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    515353.49
    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.
    1679

  • Wellbore history
    General
    Well 2/7-25 S was drilled on the Embla structure in the southern North Sea. The objective of the well was to prove the south-eastern continuation of the Embla reservoir sands seen in 2/7-20 and 2/7-21S, and if successful establish another drainage point for future development.
    Operations and results
    Appraisal well 2/7-25 S was drilled from a temporary subsea template located over the 2/7-20 well, using the semi-submersible installation West Delta. It was spudded on 29 November 1990 and drilled to TD at 5177 m (4560 m TVD) in pre-Jurassic rocks. The well was deviated to a target location 2072 m southeast of the wellhead. I was drilled without any major problems. Shallow gas was encountered in four sand intervals in the 26" hole section over the interval 595 -652 m. A minor gas flow was controlled using 11.0 ppg kill mud with high viscosity pills. The well was drilled with sea water down to 780 m, with ester emulsion based Petrofree mud from 780 m to 4557 m, and with oil based Enviromul mud from 4557 m to TD.
    Top Jurassic, Mandal Formation was encountered at 4711 m. The Jurassic consisted of 117 m Mandal Formation, 112 m Farsund Formation, and 214 m Eldfisk Formation at the base. Under the Eldfisk Formation, at 5157 m (4540 m TVD), a pre-Jurassic section was encountered. Oil shows were detected from 1594 m to 1786 m, with good shows from 1704 m to 1750 m at top Hordaland Group. Further oil shows were seen throughout all parts of the limestone section but were concentrated in the intervals 3470 m to 3484 m in the Ekofisk Formation and 4328 m to 4435 m in the Hod Formation. In addition solid bitumen staining was described on cores from the Mandal and Eldfisk Formations.
    A total of 57 m core was recovered in four cores; core 1 in the Mandal Formation (4782.3 - 4801 m), core 2 in the Farsund Formation (4843 - 4854.9 m), and cores 3&4 in the Eldfisk Formation (5088 - 5113.9 m). No wire line fluid samples were taken.
    The upper part of the well was temporary plugged to allow for sidetrack below the 13-3/8" or 20" casing should this prove economical in the future. The bottom part of the well was permanently abandoned on 31 March 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]
    780.00
    5176.80

  • 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
    15698.0
    15753.6
    [ft ]
    2
    15889.0
    15923.0
    [ft ]
    3
    16693.0
    16733.6
    [ft ]
    4
    16740.0
    16784.4
    [ft ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    53.2
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 15690-15696ft
    Core photo at depth: 15696-15702ft
    Core photo at depth: 15702-15708ft
    Core photo at depth: 15708-15714ft
    Core photo at depth: 15714-15720ft
    15690-15696ft
    15696-15702ft
    15702-15708ft
    15708-15714ft
    15714-15720ft
    Core photo at depth: 15720-15726ft
    Core photo at depth: 15726-15732ft
    Core photo at depth: 15732-15738ft
    Core photo at depth: 15738-15744ft
    Core photo at depth: 15744-15750ft
    15720-15726ft
    15726-15732ft
    15732-15738ft
    15738-15744ft
    15744-15750ft
    Core photo at depth: 15750-15753ft
    Core photo at depth: 15889-15895ft
    Core photo at depth: 15895-15901ft
    Core photo at depth: 15901-15907ft
    Core photo at depth: 15907-15913ft
    15750-15753ft
    15889-15895ft
    15895-15901ft
    15901-15907ft
    15907-15913ft
    Core photo at depth: 15913-15919ft
    Core photo at depth: 15919-15923ft
    Core photo at depth: 16693-16699ft
    Core photo at depth: 16699-16705ft
    Core photo at depth: 16705-16711ft
    15913-15919ft
    15919-15923ft
    16693-16699ft
    16699-16705ft
    16705-16711ft
    Core photo at depth: 16711-16717ft
    Core photo at depth: 16717-16723ft
    Core photo at depth: 16723-16729ft
    Core photo at depth: 16729-16733ft
    Core photo at depth: 16734-16740ft
    16711-16717ft
    16717-16723ft
    16723-16729ft
    16729-16733ft
    16734-16740ft
    Core photo at depth: 16740-16746ft
    Core photo at depth: 16746-16752ft
    Core photo at depth: 16752-16758ft
    Core photo at depth: 16758-16764ft
    Core photo at depth: 16764-16770ft
    16740-16746ft
    16746-16752ft
    16752-16758ft
    16758-16764ft
    16764-16770ft
    Core photo at depth: 16770-16776ft
    Core photo at depth: 16776-16778ft
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    16770-16776ft
    16776-16778ft

  • 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
    207.0
    36
    210.0
    0.00
    LOT
    INTERM.
    20
    764.0
    28
    770.0
    1.73
    LOT
    INTERM.
    13 3/8
    2356.0
    17 1/2
    2360.0
    1.94
    LOT
    INTERM.
    9 5/8
    4549.0
    12 1/4
    4552.0
    2.16
    LOT

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CST GR
    4572
    5186
    DIL BHC CAL GR
    2068
    4566
    DIL BHC GR
    4500
    5187
    DIL LSS CAL GR
    738
    2276
    LDL CNL NGL
    4500
    5187
    MWD - GR RES DIR
    213
    5159
    OBDT GR
    2358
    4562
    OBDT GR
    4553
    5189
    RFT GR
    4773
    5003
    VSP
    1356
    5188

  • 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
    23.39
    pdf
    32.18

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    100
    1.05
    13.0
    WATER BASED
    209
    1.05
    WATER BASED
    290
    1.05
    WATER BASED
    533
    1.05
    WATER BASED
    1089
    1.34
    32.0
    WATER BASED
    1645
    1.51
    35.0
    WATER BASED
    2100
    1.61
    48.0
    WATER BASED
    2332
    1.66
    51.0
    WATER BASED
    2569
    1.71
    43.0
    WATER BASED
    3084
    1.71
    50.0
    WATER BASED
    3317
    1.71
    47.0
    WATER BASED
    3406
    1.71
    44.0
    WATER BASED
    3486
    1.71
    39.0
    WATER BASED
    3502
    1.73
    40.0
    WATER BASED
    3547
    1.71
    43.0
    WATER BASED
    3560
    1.71
    40.0
    WATER BASED
    3570
    1.73
    41.0
    WATER BASED
    3603
    1.73
    42.0
    WATER BASED
    3612
    1.73
    39.0
    WATER BASED
    3627
    1.71
    54.0
    WATER BASED
    3643
    1.64
    56.0
    WATER BASED
    3676
    1.63
    48.0
    WATER BASED
    3791
    1.63
    45.0
    WATER BASED
    3887
    1.63
    43.0
    WATER BASED
    4005
    1.63
    46.0
    WATER BASED
    4066
    1.63
    47.0
    WATER BASED
    4121
    1.63
    45.0
    WATER BASED
    4175
    1.63
    45.0
    WATER BASED
    4184
    1.63
    43.0
    WATER BASED
    4302
    1.63
    43.0
    WATER BASED
    4364
    1.63
    40.0
    WATER BASED
    4400
    1.63
    39.0
    WATER BASED
    4444
    1.67
    48.0
    WATER BASED
    4496
    1.67
    48.0
    WATER BASED
    4522
    1.67
    43.0
    WATER BASED
    4542
    1.67
    45.0
    WATER BASED
    4551
    1.67
    48.0
    WATER BASED
    4583
    2.06
    67.0
    WATER BASED
    4588
    2.06
    52.0
    WATER BASED
    4710
    2.12
    48.0
    WATER BASED
    4715
    2.10
    51.0
    WATER BASED
    4728
    2.12
    54.0
    WATER BASED
    4801
    2.10
    52.0
    WATER BASED
    4841
    2.10
    47.0
    WATER BASED
    4843
    2.10
    49.0
    WATER BASED
    4855
    2.10
    49.0
    WATER BASED
    4914
    2.10
    49.0
    WATER BASED
    4938
    2.10
    53.0
    WATER BASED
    4941
    2.10
    53.0
    WATER BASED
    4955
    2.10
    56.0
    WATER BASED
    4963
    2.10
    59.0
    WATER BASED
    5081
    2.10
    56.0
    WATER BASED
    5088
    2.10
    52.0
    WATER BASED
    5102
    2.10
    50.0
    WATER BASED
    5112
    2.10
    48.0
    WATER BASED
    5114
    2.10
    47.0
    WATER BASED
    5126
    2.10
    46.0
    WATER BASED
    5139
    2.10
    46.0
    WATER BASED
    5143
    2.10
    44.0
    WATER BASED
    5158
    2.10
    40.0
    WATER BASED
    5165
    2.10
    48.0
    WATER BASED
    5167
    2.10
    44.0
    WATER BASED
    5177
    1.64
    13.0
    WATER BASED