Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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23.07.2024 - 01:26
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34/7-13

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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.
    34/7-13
    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).
    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.
    34/7-13
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    E 86 (3D) ROW 438 COL. 1410
    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.
    572-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.
    55
    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,
    19.02.1988
    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.
    13.04.1988
    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.
    13.04.1990
    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.
    28.02.2008
    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.
    OIL
    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.
    MIDDLE JURASSIC
    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.
    ETIVE FM
    Kelly bushing elevation [m]
    Elevation of the rotary kelly bushing (RKB) above mean sea level.
    26.0
    Water depth [m]
    Depth in metres betweem mean sea level and sea floor.
    282.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    2994.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    21
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    103
    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 TRIASSIC
    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.
    LUNDE FM
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    61° 24' 19.23'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    2° 3' 12.49'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6808466.37
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    449458.44
    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.
    1233
  • Wellbore history

    General
    Well 34/7-13 was drilled in the north western part of block 34/7 on the Snorre West prospect. The prospect is divided into two main fault segments by a SW NE trending fault with a throw of 60 m. The well was located in the southern part of the two segments. The primary purposes of the well were to explore the Snorre West prospect and to test a possible extension of the Statfjord East Field in a northward direction. The main target of the well was sandstones of the Middle Jurassic Brent Group. Secondary target was sandstones of the Early Jurassic Statfjord Formation.
    Operations and results
    Wildcat well 34/7-13 was spudded with the semi-submersible installation Treasure Saga on 19 February 1988 and drilled to TD at 2994 m in the Late Triassic Lunde Formation. Drilling proceeded without significant problems, but up to 21 deg deviation in the deepest section of the well caused 11 m deviation between MD and TVD at TD. Shallow gas was encountered at 459 m, but it did not cause any technical problems. The well was drilled with spud mud down to 434, with Gel mud from 434 m to 973 m, with KCl mud from 973 m to 2682 m, and with gel mud from 2682 m to TD.
    Above the Jurassic the well penetrated mainly claystones with the exception of the Utsira Formation and some sandstone intervals between 1265 and 1325 m in the Hordaland Group. The Jurassic comprised the Middle Jurassic Brent Group, and the Early Jurassic Dunlin Group and Statfjord Formation. The Triassic comprised the Late Triassic upper Lunde Formation. The sandstones of the Brent Group, the Etive Formation, were encountered at 2492.5 m (TVD: 2490 m). The Etive Formation proved oil bearing, and the OWC was calculated to be at 2505.5 m (TVD: 2503 m). This was a thinner oil column than prognosed and the resources for the prospect were thus reduced compared to what was expected.
    The sandstones of the Statfjord Formation proved water bearing.
    First sign of petroleum hydrocarbons (C2 - C3) were reported at 2260 m. From 2285 m weak oil shows were seen in sand stringers. Over the reservoir and down to approximately 2510 m good oil shows were observed. Below 2510 m oil shows got weaker but traces were seen down to 2590 m.
    Five cores were cut in the interval 2496 - 2587.8 m. A total of 5 cores were cut throughout this section with 99 % recovery. A sixth core was cut from 2873 to 2890.5 m in the Statfjord Formation. FMT samples were taken at 2493.4 m (oil), 2494.4 m (oil), and 2503.7 m (water contaminated with mud filtrate). Single stage flash of the sample from 2493.4 m gave a GOR of 84.3 Sm3/Sm3, an oil density of 0.8392 g/cm3, and a gas gravity of 0.925 (air = 1).
    The well was permanently abandoned on 13 April 1988. It is classified as an oil appraisal on the Vigdis Discovery.
    Testing
    One DST was performed in the interval 2498.1 - 2501.1 m in the Etive Formation. At the end of a 6.8 hours flow period, "Formation characteristics flow", the well produced 935 Sm3/day of oil with a GOR of 49 Sm3/Sm3 through an 11.1 mm choke. In the beginning of the main flow period the maximum recorded oil rate was 1350 Sm3/day through a 16 mm choke. The GOR in this flow was 51 Sm3/Sm3 and the oil density was 0.840 g/cm3. At the end of the main flow the well produced with 30-35% water cut. Sand production was also observed. Maximum down-hole temperature in the test (measured during main flow) was 90 deg C.
    A second DST was omitted due to problems caused by sand production.
  • 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]
    440.00
    2994.00
  • 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
    2496.0
    2500.0
    [m ]
    2
    2500.0
    2515.3
    [m ]
    3
    2515.5
    2532.0
    [m ]
    4
    2532.0
    2559.6
    [m ]
    5
    2560.0
    2587.7
    [m ]
    6
    2873.0
    2889.9
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    108.0
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 2496-2500m
    Core photo at depth: 2500-2505m
    Core photo at depth: 2505-2510m
    Core photo at depth: 2510-2515m
    Core photo at depth: 2515-2515m
    2496-2500m
    2500-2505m
    2505-2510m
    2510-2515m
    2515-2515m
    Core photo at depth: 2515-2510m
    Core photo at depth: 2520-2525m
    Core photo at depth: 2525-2530m
    Core photo at depth: 2530-2532m
    Core photo at depth: 2532-2537m
    2515-2510m
    2520-2525m
    2525-2530m
    2530-2532m
    2532-2537m
    Core photo at depth: 2537-2542m
    Core photo at depth: 2542-2547m
    Core photo at depth: 2547-2552m
    Core photo at depth: 2552-2557m
    Core photo at depth: 2557-2559m
    2537-2542m
    2542-2547m
    2547-2552m
    2552-2557m
    2557-2559m
    Core photo at depth: 2560-2565m
    Core photo at depth: 2565-2570m
    Core photo at depth: 2570-2575m
    Core photo at depth: 2575-2580m
    Core photo at depth: 2575-2580m
    2560-2565m
    2565-2570m
    2570-2575m
    2575-2580m
    2575-2580m
    Core photo at depth: 2580-2585m
    Core photo at depth: 2585-2587m
    Core photo at depth: 2873-2878m
    Core photo at depth: 2878-2883m
    Core photo at depth: 2883-2888m
    2580-2585m
    2585-2587m
    2873-2878m
    2878-2883m
    2883-2888m
    Core photo at depth: 2888-2890m
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    Core photo at depth:  
    2888-2890m
  • Palynological slides at the Norwegian Offshore Directorate

    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    2696.3
    [m]
    C
    OD
    2696.5
    [m]
    C
    OD
  • Oil samples at the Norwegian Offshore Directorate

    Oil samples at the Norwegian Offshore Directorate
    Test type
    Bottle number
    Top depth
    MD [m]
    Bottom depth
    MD [m]
    Fluid type
    Test time
    Samples available
    DST
    DST1,1
    2504.00
    2500.00
    05.04.1988 - 14:50
    YES
  • Lithostratigraphy

  • Geochemical information

    Geochemical information
    Document name
    Document format
    Document size [MB]
    pdf
    0.29
    pdf
    1.25
  • 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
    12.67
  • Drill stem tests (DST)

    Drill stem tests (DST)
    Test number
    From depth MD
    [m]
    To depth MD
    [m]
    Choke size
    [mm]
    1.0
    2501
    2504
    16.0
    Drill stem tests (DST)
    Test number
    Final shut-in pressure
    [MPa]
    Final flow pressure
    [MPa]
    Bottom hole pressure
    [MPa]
    Downhole temperature
    [°C]
    1.0
    34.000
    15.000
    88
    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
    1350
    68850
    0.840
    51
  • Logs

    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL GR
    750
    1842
    CBL VDL GR
    1000
    2664
    CBL VDL GR
    2370
    2550
    CNL CDL GR
    1842
    2682
    CNL CDL GR
    2664
    2992
    COREGUN
    0
    0
    COREGUN
    2496
    2587
    COREGUN
    2873
    2890
    DIFL LS BHC GR
    957
    1855
    DIFL LS BHC GR
    1842
    2681
    DIFL LS BHC GR
    2664
    2993
    DIPLOG
    2300
    2678
    DIPLOG
    2667
    2993
    DLL GR
    2300
    2600
    FMT
    2494
    2563
    FMT
    2876
    2960
    MWD DLWD - GR RES DIR TEMP
    434
    2994
    VSP
    1115
    2990
  • 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
    429.0
    36
    429.0
    0.00
    LOT
    SURF.COND.
    20
    957.0
    26
    973.0
    1.59
    LOT
    INTERM.
    13 3/8
    1843.0
    17 1/2
    1875.0
    1.81
    LOT
    INTERM.
    9 5/8
    2667.0
    12 1/4
    2682.0
    2.03
    LOT
    OPEN HOLE
    2994.0
    8 1/2
    2994.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    434
    1.05
    WATER BASED
    25.03.1988
    507
    1.12
    5.0
    12.0
    WATER BASED
    25.03.1988
    890
    1.16
    4.0
    7.7
    WATER BASED
    24.02.1988
    970
    1.16
    WATER BASED
    25.03.1988
    970
    1.16
    4.0
    7.2
    WATER BASED
    25.02.1988
    973
    1.12
    21.0
    13.9
    WATER BASED
    02.03.1988
    973
    1.14
    4.0
    6.8
    WATER BASED
    24.02.1988
    1348
    1.13
    20.0
    9.6
    WATER BASED
    02.03.1988
    1479
    1.25
    23.0
    10.1
    WATER BASED
    02.03.1988
    1681
    1.45
    26.0
    11.5
    WATER BASED
    03.03.1988
    1875
    1.50
    33.0
    13.5
    WATER BASED
    03.03.1988
    1875
    1.50
    33.0
    13.5
    WATER BASED
    04.03.1988
    1875
    1.50
    32.0
    11.5
    WATER BASED
    07.03.1988
    1875
    1.50
    32.0
    12.5
    WATER BASED
    07.03.1988
    1875
    1.50
    33.0
    13.5
    WATER BASED
    07.03.1988
    1875
    1.50
    31.0
    12.0
    WATER BASED
    08.03.1988
    1992
    1.55
    30.0
    10.6
    WATER BASED
    14.03.1988
    2100
    1.61
    27.0
    6.3
    WATER BASED
    25.03.1988
    2100
    1.61
    27.0
    6.3
    WATER BASED
    28.03.1988
    2100
    1.64
    26.0
    7.7
    WATER BASED
    16.03.1988
    2100
    1.61
    20.0
    4.8
    WATER BASED
    18.03.1988
    2100
    1.61
    25.0
    6.3
    WATER BASED
    22.03.1988
    2100
    1.61
    27.0
    6.3
    WATER BASED
    24.03.1988
    2100
    1.61
    24.0
    5.8
    WATER BASED
    18.03.1988
    2100
    1.61
    20.0
    6.3
    WATER BASED
    21.03.1988
    2100
    1.61
    27.0
    5.8
    WATER BASED
    25.03.1988
    2106
    1.60
    35.0
    9.1
    WATER BASED
    14.03.1988
    2232
    1.60
    33.0
    8.2
    WATER BASED
    14.03.1988
    2404
    1.65
    28.0
    7.7
    WATER BASED
    15.03.1988
    2470
    1.50
    15.0
    3.9
    WATER BASED
    11.04.1988
    2492
    1.50
    16.0
    4.4
    WATER BASED
    11.04.1988
    2492
    1.50
    18.0
    6.8
    WATER BASED
    11.04.1988
    2492
    1.50
    16.0
    4.4
    WATER BASED
    06.04.1988
    2492
    1.50
    16.0
    4.4
    WATER BASED
    08.04.1988
    2492
    1.50
    16.0
    4.4
    WATER BASED
    05.04.1988
    2492
    1.50
    16.0
    4.4
    WATER BASED
    07.04.1988
    2495
    1.65
    25.0
    6.8
    WATER BASED
    15.03.1988
    2495
    1.65
    27.0
    7.7
    WATER BASED
    15.03.1988
    2532
    1.65
    26.0
    7.7
    WATER BASED
    16.03.1988
    2589
    1.61
    19.0
    6.3
    WATER BASED
    21.03.1988
    2690
    1.61
    26.0
    6.3
    WATER BASED
    28.03.1988
    2777
    1.61
    29.0
    7.7
    WATER BASED
    28.03.1988
    2777
    1.61
    29.0
    7.7
    WATER BASED
    29.03.1988
    2777
    1.61
    26.0
    7.2
    WATER BASED
    30.03.1988
    2777
    1.61
    26.0
    7.2
    WATER BASED
    05.04.1988
    2876
    1.61
    26.0
    7.2
    WATER BASED
    05.04.1988
  • 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