Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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25/3-1

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  • General information
    General information
    Attribute Value
    Wellbore name
    25/3-1
    Type
    EXPLORATION
    Purpose
    WILDCAT
    Status
    P&A
    Factmaps in new window
    Main area
    NORTH SEA
    Well name
    25/3-1
    Seismic location
    LINJE EL 8808-115 & SP 210
    Drilling operator
    Elf Petroleum Norge AS
    Drill permit
    613-L
    Production licence at wellhead
    Prod. licence for drilling target
    Drilling facility
    Drilling days
    63
    Entered date
    05.07.1989
    Completed date
    05.09.1989
    Release date
    05.09.1991
    Publication date
    25.06.2005
    Purpose – planned
    WILDCAT
    Reentry
    NO
    Content
    DRY
    Discovery wellbore
    NO
    Kelly bushing elevation [m]
    22.0
    Water depth [m]
    114.0
    Total depth (MD) [m RKB]
    3922.0
    Final vertical depth (TVD) [m RKB]
    3921.0
    Maximum inclination [°]
    2.8
    Bottom hole temperature [°C]
    138
    Oldest penetrated age
    LATE TRIASSIC
    Oldest penetrated formation
    STATFJORD GP
    Geodetic datum
    ED50
    NS degrees
    59° 55' 52.99'' N
    EW degrees
    2° 46' 21.34'' E
    NS UTM [m]
    6643946.88
    EW UTM [m]
    487288.97
    UTM zone
    31
    NPDID wellbore
    1419
    Legend +

  • Wellbore history
    General
    Well 25/3-1 was designed to drill a narrow NNW-SSE trending horst structure on the Utsira High. The main objective for the well was to test the hydrocarbon potential of the Middle Jurassic Vestland Group sandstones, and the Lower Jurassic Statfjord Formation sandstones. The site survey indicated two high amplitude events at two different levels west (135 m MSL) and northwest (180 m MSL) of the proposed well location that could indicate shallow gas.
    Operations and results
    Wildcat well 25/3-1 was spudded with the semi-submersible installation West Vanguard on 4 July 1989and drilled to TD at 3922 m in Late Triassic sediments of the Statfjord Formation. To assure safe operation in possible shallow gas zones, the interval (198 to 720 m) was drilled as a 17 1/2 " pilot hole before opening to 26" hole. Drilling went on without any serious problems. No shallow gas was encountered.
    The Vestland Group reservoir was reached 65 m deeper than expected. The reservoir was thinner than expected, and of relatively bad quality and water bearing. The Statfjord Formation was reached 128 m deeper than expected, and also water bearing. Very weak shows were recorded in two samples from 2165 m and 2170 m in the Balder Formation; otherwise no shows were recorded while drilling. Geochemical source rock screening found very good Type II kerogen (oil) source potential in the Draupne Formation and good Type II-III kerogen (gas + light oil) source potential in the Heather shales and the Vestland Group coals and shales. The well has reached early maturity probably at ca 2700 m, so the Draupne shale is in the very early oil window.
    Two cores were cut. Core no 1 was cut from 3112 to 3130 m in the Vestland Group, and no 2 from 3858 to 3876 m in the Statfjord Formation. The RFT tool was run, but due to obstruction in the hole representative pressure points were not obtained. No fluid sample was taken.
    The well was permanently abandoned on 5 September 1989 as a dry hole.
    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]
    200.00
    3922.00

  • 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
    3112.0
    3129.9
    [m ]
    2
    3858.0
    3873.9
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    33.7
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES

  • Core photos
    Core photos
    Core photo at depth: 3112-3117m
    Core photo at depth: 3117-3122m
    Core photo at depth: 3122-3127m
    Core photo at depth: 3127-3129m
    Core photo at depth: 3858-3863m
    3112-3117m
    3117-3122m
    3122-3127m
    3127-3129m
    3858-3863m
    Core photo at depth: 3863-3868m
    Core photo at depth: 3868-3873m
    Core photo at depth: 3873-3874m
    Core photo at depth:  
    Core photo at depth:  
    3863-3868m
    3868-3873m
    3873-3874m

  • Palynological slides at the Norwegian Offshore Directorate
    Palynological slides at the Norwegian Offshore Directorate
    Sample depth
    Depth unit
    Sample type
    Laboratory
    1680.0
    [m]
    DC
    RRI
    1700.0
    [m]
    DC
    RRI
    1720.0
    [m]
    DC
    RRI
    1740.0
    [m]
    DC
    RRI
    1760.0
    [m]
    DC
    RRI
    1780.0
    [m]
    DC
    RRI
    1800.0
    [m]
    DC
    RRI
    1820.0
    [m]
    DC
    RRI
    1840.0
    [m]
    DC
    RRI
    1860.0
    [m]
    DC
    RRI
    1880.0
    [m]
    DC
    RRI
    1900.0
    [m]
    DC
    RRI
    1920.0
    [m]
    DC
    RRI
    1940.0
    [m]
    DC
    RRI
    1960.0
    [m]
    DC
    RRI
    1980.0
    [m]
    DC
    RRI
    2000.0
    [m]
    DC
    RRI
    2020.0
    [m]
    DC
    RRI
    2040.0
    [m]
    DC
    RRI
    2060.0
    [m]
    DC
    RRI
    2080.0
    [m]
    DC
    RRI
    2100.0
    [m]
    DC
    RRI
    2120.0
    [m]
    DC
    RRI
    2140.0
    [m]
    DC
    RRI
    2160.0
    [m]
    DC
    RRI
    2180.0
    [m]
    DC
    RRI
    2200.0
    [m]
    DC
    RRI
    2220.0
    [m]
    DC
    RRI
    2240.0
    [m]
    DC
    RRI
    2260.0
    [m]
    DC
    RRI
    2280.0
    [m]
    DC
    RRI
    2310.0
    [m]
    DC
    RRI
    2330.0
    [m]
    DC
    RRI
    2350.0
    [m]
    DC
    RRI
    2370.0
    [m]
    DC
    RRI
    2390.0
    [m]
    DC
    RRI
    2410.0
    [m]
    DC
    RRI
    2430.0
    [m]
    DC
    RRI
    3112.0
    [m]
    C
    RRI
    3116.0
    [m]
    C
    RRI
    3119.0
    [m]
    C
    RRI
    3126.0
    [m]
    C
    RRI
    3128.0
    [m]
    C
    RRI
    3325.0
    [m]
    DC
    RRI
    3340.0
    [m]
    DC
    RRI

  • Lithostratigraphy

  • Composite logs
    Composite logs
    Document name
    Document format
    Document size [MB]
    .pdf
    0.62

  • Geochemical information
    Geochemical information
    Document name
    Document format
    Document size [MB]
    .pdf
    2.60

  • 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
    15.41

  • Logs
    Logs
    Log type
    Log top depth [m]
    Log bottom depth [m]
    CBL VDL GR
    1750
    2990
    CBL VDL GR CCL
    1360
    1984
    CDM AP
    1998
    2970
    CDM AP
    2997
    3918
    CDM AP
    3100
    3918
    DIL DDBHC GR AMS SP
    703
    1998
    DIL DDBHC GR AMS SP
    1984
    2995
    DIL GR SLS MSFL AMS
    2993
    3921
    FMS GR
    2993
    3922
    LDL CNL NGS AMS
    2993
    3922
    LDL GR AMS
    703
    1998
    LDL GR AMS
    1984
    2995
    MSD
    1998
    2970
    MWD
    199
    3922
    NGT RATIOS
    2993
    3922
    SHDT GR AMS
    1984
    2993
    STL GR
    2003
    2985
    VELOCITY
    707
    3921

  • 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
    197.0
    36
    198.0
    0.00
    LOT
    INTERM.
    20
    703.0
    26
    720.0
    1.33
    LOT
    INTERM.
    13 3/8
    1983.0
    17 1/2
    1998.0
    1.66
    LOT
    INTERM.
    9 5/8
    2991.0
    12 1/4
    3005.0
    1.93
    LOT
    OPEN HOLE
    3922.0
    8 1/2
    3922.0
    0.00
    LOT

  • Drilling mud
    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    909
    1.09
    16.0
    9.8
    WATER BASED
    14.07.1989
    1243
    1.13
    19.0
    10.7
    WATER BASED
    14.07.1989
    1840
    1.20
    22.0
    11.7
    WATER BASED
    17.07.1989
    1858
    1.21
    26.0
    12.7
    WATER BASED
    18.07.1989
    1948
    1.20
    23.0
    12.2
    WATER BASED
    19.07.1989
    1998
    1.20
    22.0
    12.2
    WATER BASED
    20.07.1989
    3071
    1.25
    26.0
    7.3
    WATER BASED
    10.08.1989
    3118
    1.25
    31.0
    5.8
    WATER BASED
    11.08.1989
    3198
    1.25
    34.0
    12.7
    WATER BASED
    14.08.1989
    3291
    1.25
    32.0
    12.7
    WATER BASED
    14.08.1989
    3353
    1.25
    30.0
    11.7
    WATER BASED
    14.08.1989
    3395
    1.25
    28.0
    11.7
    WATER BASED
    15.08.1989
    3429
    1.30
    31.0
    11.7
    WATER BASED
    22.08.1989
    3456
    1.26
    30.0
    11.7
    WATER BASED
    16.08.1989
    3491
    1.30
    31.0
    13.7
    WATER BASED
    17.08.1989
    3569
    1.30
    31.0
    12.7
    WATER BASED
    22.08.1989
    3719
    1.35
    33.0
    14.7
    WATER BASED
    22.08.1989
    3774
    1.35
    34.0
    13.7
    WATER BASED
    22.08.1989
    3858
    1.35
    34.0
    11.7
    WATER BASED
    24.08.1989
    3858
    1.35
    34.0
    11.7
    WATER BASED
    24.08.1989
    3871
    1.45
    37.0
    12.7
    WATER BASED
    25.08.1989