Factpages Norwegian Offshore Directorate
Factpages Norwegian Offshore Directorate
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01.12.2024 - 01:27
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31/2-4 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.
    31/2-4 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).
    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.
    SUSPENDED
    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.
    31/2-4
    Seismic location
    Position of spud location on seismic survey lines. SP: shotpoint.
    624445 SP: 195
    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.
    A/S Norske Shell
    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.
    261-L2
    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.
    180
    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,
    09.10.1980
    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.
    06.04.1981
    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.
    06.04.1983
    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.
    15.02.2006
    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.
    DRILLING
    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.
    LATE 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.
    SOGNEFJORD FM
    2nd level with HC, age
    Age of lithostratigraphic unit, 2nd level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE.
    MIDDLE JURASSIC
    2nd level with HC, formation
    Name of lithostartigraphic unit, 2nd 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.
    FENSFJORD FM
    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.
    336.0
    Total depth (MD) [m RKB]
    Total measured length of wellbore from kelly bushing to total depth (driller's depth).
    5035.0
    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).
    5035.0
    Maximum inclination [°]
    Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.
    4
    Bottom hole temperature [°C]
    Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.
    141
    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 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.
    HEGRE GP
    Geodetic datum
    Reference system for coordinates. Example of legal values: ED50.
    ED50
    NS degrees
    Geographic coordinate of the wellhead, north-south degrees.
    60° 51' 23.57'' N
    EW degrees
    Geographic coordinate of the wellhead, east-west degrees.
    3° 30' 44.33'' E
    NS UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, north-south.
    6747077.42
    EW UTM [m]
    Universal Transverse Mercator coordinate of the wellhead, east-west.
    527835.00
    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.
    502
  • Wellbore history

    General
    Well 31/2-4 is located some 10 km NNW of the discovery well 31/2-1 in a separate fault compartment near the crest of the Jurassic gas accumulation. This crestal area appeared also to coincide with the culminations of all deeper horizons that could be mapped. The well had two main objectives. The first was to appraise the Jurassic gas accumulation in the 31/2-1 Troll Discovery in a location with nearly maximum gross hydrocarbon column. The well should test lateral variations in this reservoir. The second major objective was to explore deeper Triassic/Palaeozoic Formations. The well would test possible hydrocarbon accumulations under the Late Jurassic Troll reservoir, explore possible pre-Jurassic source rocks, and provide geological ages for deep horizons and thus improve the regional geological setting.
    TD of the well was proposed to be 5000 m below sea level or in Palaeozoic formations whatever came first.
    Well 31/2-4 was originally drilled with Borgny Dolphin down to 815 m in 1980. The well was however suspended on 13 September 1980 due to a blow out on 34/10-10, where Borgny Dolphin's services were immediately required.
    Operations and results
    Well 31/2-4 was re-entered (31/2-4 R) with the semi-submersible installation Borgny Dolphin on 9 October 1980 and drilled to TD at 5035 m in Early Triassic sediments of the Hegre Group. The well bore deviation did not exceed 4 deg and at 4693 m, the deepest survey point reported, there was only 2 m difference between drilled and true vertical depth. The top hole down to 815 m had previously been drilled with seawater and hi-vis pills. From 815 m to 1280 m the well was drilled with KC/polymer mud, from 1280 m to 1951 m it was drilled with KCl/polymer converting to gel/lignosulphonate, from 1951 m to 4029 m it was drilled with seawater/gel/dispersed lignosulphonate, and from 4029 m to TD it was drilled with a gypsum/lignosulphonate mud.
    The top of the gas-bearing reservoir was found at 1364.5 m. The accurate pick of the GOC from logs was hampered severely by lithology effects placing the GOC somewhere between 1567 and 1573 m, with 1568 m as a likely place. A depth of 1572 m is however, more consistent with other wells in the field. OWC was found at 1580 m.
    Lithologically, the reservoir sequence in 31/2-4 R is similar to that encountered in earlier wells in the block. A largely unconsolidated high porosity - high permeability sand occurred in the top part of the reservoir (Sognefjord Formation). This was underlain by a finer grained, better consolidated, but strongly micaceous sandstone (Heather Formation), in which porosity was somewhat reduced and permeability was low. Beneath this micaceous interval was a zone of more variable lithology, comprising interbeds of fine, micaceous sands and coarser cleaner sands (Fensfjord Formation). Thin (generally less than 1 m thick) carbonate cemented bands occurred throughout the reservoir and formed very low porosity - permeability horizons. Carbonate cementation did not appear to be restricted to any one particular litho-type, and the individual bands were not believed to be of significant lateral extent, (lateral contacts between cemented and non-cemented lithologies have been cored).
    The seal in 31/2-4 is formed by a thick sequence of Palaeocene claystones. Reworked Late Cretaceous fauna occur in these claystones immediately above the reservoir.
    No significant hydrocarbon indications were seen in the section below the main Jurassic accumulation. The well drilled Triassic sediments from 2422 m (Hegre Group) to TD. The upper section down to 3345 m was dominantly claystones/siltstones with interbedded sandstones. The lithology below 3345 was dominantly sandstone. One RFT run acquired pressure data points over the Jurassic reservoir section and two more runs acquired twelve good pressure points from the Early Jurassic to Triassic formations from 2142 m to 4969 m. The latter two runs showed two hydrostatic water gradients with a break somewhere between 2713 m and 3262 m. The break towards a higher gradient could represent a more saline water in the deeper section. An RFT gas sample was taken at 1566 m, just above the anticipated GOC. An extensive coring programme was carried out with a total of 29 recovered cores. Top coring point was in the Paleocene cap rock above the reservoir, and coring continued over the entire hydrocarbon bearing Late/Middle Jurassic reservoir section. A bottom hole core (core no 29) was taken at TD in the well.
    After Logging at TD the rig went on hire to Shell UK Exploration and Production. The well was suspended on 6 April 1981 for possible testing and abandonment at a later stage. The well was classified as a gas and oil appraisal well. Testing
    No drill stem test was performed.
  • 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
    1320.0
    1325.7
    [m ]
    2
    1326.0
    1326.5
    [m ]
    3
    1338.0
    1347.0
    [m ]
    4
    1347.0
    1357.0
    [m ]
    5
    1365.0
    1378.0
    [m ]
    6
    1379.0
    1397.0
    [m ]
    7
    1397.0
    1410.0
    [m ]
    8
    1410.0
    1415.0
    [m ]
    9
    1415.0
    1425.0
    [m ]
    10
    1426.5
    1426.7
    [m ]
    11
    1443.5
    1452.5
    [m ]
    12
    1452.5
    1454.2
    [m ]
    13
    1454.5
    1468.3
    [m ]
    14
    1472.5
    1479.5
    [m ]
    15
    1482.5
    1483.2
    [m ]
    16
    1484.5
    1490.0
    [m ]
    17
    1490.0
    1506.8
    [m ]
    18
    1508.0
    1524.6
    [m ]
    19
    1526.0
    1543.3
    [m ]
    20
    1544.0
    1562.0
    [m ]
    21
    1562.0
    1566.9
    [m ]
    22
    1567.0
    1582.8
    [m ]
    23
    1585.0
    1599.2
    [m ]
    24
    1603.0
    1606.6
    [m ]
    25
    1607.0
    1621.0
    [m ]
    26
    1621.0
    1626.1
    [m ]
    27
    1627.0
    1644.4
    [m ]
    28
    1645.0
    1662.9
    [m ]
    29
    5025.0
    5033.4
    [m ]
    Cores at the Norwegian Offshore Directorate
    Total core sample length [m]
    291.8
    Cores at the Norwegian Offshore Directorate
    Cores available for sampling?
    YES
  • Core photos

    Core photos
    Core photo at depth: 1320-1323m
    Core photo at depth: 1323-1325m
    Core photo at depth: 1325-1326m
    Core photo at depth: 1326-1327m
    Core photo at depth: 1338-1340m
    1320-1323m
    1323-1325m
    1325-1326m
    1326-1327m
    1338-1340m
    Core photo at depth: 1340-1343m
    Core photo at depth: 1343-1346m
    Core photo at depth: 1346-1347m
    Core photo at depth: 1347-1349m
    Core photo at depth: 1349-1352m
    1340-1343m
    1343-1346m
    1346-1347m
    1347-1349m
    1349-1352m
    Core photo at depth: 1352-1355m
    Core photo at depth: 1355-1357m
    Core photo at depth: 1365-1367m
    Core photo at depth: 1367-1370m
    Core photo at depth: 1370-1373m
    1352-1355m
    1355-1357m
    1365-1367m
    1367-1370m
    1370-1373m
    Core photo at depth: 1373-1375m
    Core photo at depth: 1375-1378m
    Core photo at depth: 1379-1381m
    Core photo at depth: 1381-1384m
    Core photo at depth: 1384-1387m
    1373-1375m
    1375-1378m
    1379-1381m
    1381-1384m
    1384-1387m
    Core photo at depth: 1387-1389m
    Core photo at depth: 1389-1392m
    Core photo at depth: 1392-1395m
    Core photo at depth: 1395-1397m
    Core photo at depth: 1397-1399m
    1387-1389m
    1389-1392m
    1392-1395m
    1395-1397m
    1397-1399m
    Core photo at depth: 1399-1402m
    Core photo at depth: 1402-1405m
    Core photo at depth: 1405-1407m
    Core photo at depth: 1410-1412m
    Core photo at depth: 1412-1415m
    1399-1402m
    1402-1405m
    1405-1407m
    1410-1412m
    1412-1415m
    Core photo at depth: 1415-1418m
    Core photo at depth: 1418-1420m
    Core photo at depth: 1420-1423m
    Core photo at depth: 1423-1425m
    Core photo at depth: 1426-1427m
    1415-1418m
    1418-1420m
    1420-1423m
    1423-1425m
    1426-1427m
    Core photo at depth: 1443-1446m
    Core photo at depth: 1446-1448m
    Core photo at depth: 1448-1451m
    Core photo at depth: 1451-1452m
    Core photo at depth: 1452-1454m
    1443-1446m
    1446-1448m
    1448-1451m
    1451-1452m
    1452-1454m
    Core photo at depth: 1454-1457m
    Core photo at depth: 1457-1459m
    Core photo at depth: 1459-1462m
    Core photo at depth: 1462-1465m
    Core photo at depth: 1465-1468m
    1454-1457m
    1457-1459m
    1459-1462m
    1462-1465m
    1465-1468m
    Core photo at depth: 1468-1468m
    Core photo at depth: 1472-1475m
    Core photo at depth: 1475-1477m
    Core photo at depth: 1477-1479m
    Core photo at depth: 1482-1483m
    1468-1468m
    1472-1475m
    1475-1477m
    1477-1479m
    1482-1483m
    Core photo at depth: 1484-1487m
    Core photo at depth: 1487-1489m
    Core photo at depth: 1489-1489m
    Core photo at depth: 1490-1492m
    Core photo at depth: 1492-1495m
    1484-1487m
    1487-1489m
    1489-1489m
    1490-1492m
    1492-1495m
    Core photo at depth: 1495-1498m
    Core photo at depth: 1498-1500m
    Core photo at depth: 1500-1503m
    Core photo at depth: 1503-1506m
    Core photo at depth: 1506-1506m
    1495-1498m
    1498-1500m
    1500-1503m
    1503-1506m
    1506-1506m
    Core photo at depth: 1508-1510m
    Core photo at depth: 1510-1513m
    Core photo at depth: 1508-1516m
    Core photo at depth: 1516-1518m
    Core photo at depth: 1518-1521m
    1508-1510m
    1510-1513m
    1508-1516m
    1516-1518m
    1518-1521m
    Core photo at depth: 1521-1524m
    Core photo at depth: 1521-1524m
    Core photo at depth: 1524-1525m
    Core photo at depth: 1526-1528m
    Core photo at depth: 1528-1531m
    1521-1524m
    1521-1524m
    1524-1525m
    1526-1528m
    1528-1531m
    Core photo at depth: 1531-1534m
    Core photo at depth: 1534-1536m
    Core photo at depth: 1536-1539m
    Core photo at depth: 1539-1542m
    Core photo at depth: 1542-1543m
    1531-1534m
    1534-1536m
    1536-1539m
    1539-1542m
    1542-1543m
    Core photo at depth: 1544-1546m
    Core photo at depth: 1546-1549m
    Core photo at depth: 1549-1552m
    Core photo at depth: 1552-1554m
    Core photo at depth: 1554-1557m
    1544-1546m
    1546-1549m
    1549-1552m
    1552-1554m
    1554-1557m
    Core photo at depth: 1557-1560m
    Core photo at depth: 1560-1562m
    Core photo at depth: 1562-1564m
    Core photo at depth: 1564-1566m
    Core photo at depth: 1567-1569m
    1557-1560m
    1560-1562m
    1562-1564m
    1564-1566m
    1567-1569m
    Core photo at depth: 1569-1572m
    Core photo at depth: 1572-1575m
    Core photo at depth: 1575-1577m
    Core photo at depth: 1577-1580m
    Core photo at depth: 1580-1582m
    1569-1572m
    1572-1575m
    1575-1577m
    1577-1580m
    1580-1582m
    Core photo at depth: 1585-1587m
    Core photo at depth: 1587-1590m
    Core photo at depth: 1590-1593m
    Core photo at depth: 1593-1595m
    Core photo at depth: 1595-1598m
    1585-1587m
    1587-1590m
    1590-1593m
    1593-1595m
    1595-1598m
    Core photo at depth: 1598-1599m
    Core photo at depth: 1603-1605m
    Core photo at depth: 1605-1606m
    Core photo at depth: 1607-1609m
    Core photo at depth: 1609-1612m
    1598-1599m
    1603-1605m
    1605-1606m
    1607-1609m
    1609-1612m
    Core photo at depth: 1612-1615m
    Core photo at depth: 1615-1617m
    Core photo at depth: 1617-1620m
    Core photo at depth: 1620-1621m
    Core photo at depth: 1621-1623m
    1612-1615m
    1615-1617m
    1617-1620m
    1620-1621m
    1621-1623m
    Core photo at depth: 1623-1626m
    Core photo at depth: 1627-1629m
    Core photo at depth: 1629-1632m
    Core photo at depth: 1632-1635m
    Core photo at depth: 1635-1637m
    1623-1626m
    1627-1629m
    1629-1632m
    1632-1635m
    1635-1637m
    Core photo at depth: 1637-1640m
    Core photo at depth: 1640-1643m
    Core photo at depth: 1643-1644m
    Core photo at depth: 1647-1650m
    Core photo at depth: 1650-1653m
    1637-1640m
    1640-1643m
    1643-1644m
    1647-1650m
    1650-1653m
    Core photo at depth: 1653-1655m
    Core photo at depth: 1655-1658m
    Core photo at depth: 1658-1661m
    Core photo at depth: 1661-1662m
    Core photo at depth: 5025-5027m
    1653-1655m
    1655-1658m
    1658-1661m
    1661-1662m
    5025-5027m
    Core photo at depth: 5027-5030m
    Core photo at depth: 5030-5033m
    Core photo at depth: 5033-5034m
    Core photo at depth:  
    Core photo at depth:  
    5027-5030m
    5030-5033m
    5033-5034m
  • Lithostratigraphy

  • Composite logs

    Composite logs
    Document name
    Document format
    Document size [MB]
    pdf
    1.04
  • 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
    446.0
    36
    450.0
    0.00
    LOT
    SURF.COND.
    20
    807.0
    26
    815.0
    1.71
    LOT
    LINER
    16
    1272.0
    22
    1280.0
    1.71
    LOT
    INTERM.
    13 3/8
    1927.0
    15 3/4
    1946.0
    0.00
    LOT
    INTERM.
    9 5/8
    3982.0
    12 1/4
    4029.0
    0.00
    LOT
    OPEN HOLE
    5035.0
    8 1/2
    5035.0
    0.00
    LOT
  • Drilling mud

    Drilling mud
    Depth MD [m]
    Mud weight [g/cm3]
    Visc. [mPa.s]
    Yield point [Pa]
    Mud type
    Date measured
    820
    1.56
    seawater
    1665
    1.62
    seawater
    2000
    1.46
    seawater
    2310
    1.46
    seawater
    3480
    1.46
    seawater
    3640
    1.44
    seawater