General information Attribute Value Wellbore nameOfficial name of wellbore based on NPD guidelines for designation of wells and wellbores.35/11-4 TypeWellbore type. Legal values: EXPLORATION, DEVELOPMENT, OTHER (see 'Purpose' for more information)EXPLORATION PurposeFinal 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).WILDCAT
StatusStatus 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 NPD.
INJECTING: It was injected to the wellbore at the time of the operators last monthly report to the NPD.
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.
SUSPENDEDFactmaps in new window
Main areaName of the area on the Norwegian Continental Shelf where the wellbore is located. Legal values: BARENTS SEA, NORWEGIAN SEA, NORTH SEA.NORTH SEA FieldName of the field the wellbore is related to. DiscoveryName of the discovery the wellbore is related to. Well nameOfficial name of the parent well for the wellbore based on NPD guidelines for designation of wells and wellbores.35/11-4 Seismic locationPosition of spud location on seismic survey lines. SP: shotpoint.MN88 - 814 SP 440 Production licenceOfficial designation of the production licence the wellbore was drilled or planned to be drilled from ( well head posistion). Drilling operatorName 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.Mobil Exploration Norway INC Drill permitThe drilling permit number together with the version of the drilling permit as stated in the drilling permit granted by the NPD.642-L Drilling facilityNPD's name of the facility which the wellbore was drilled from. Drilling daysNumber of days from wellbore entry to wellbore completion.134 Entered dateThe date when he wellbore was spudded. For sidetracks: The date when new formation was drilled by kicking off from the mother-wellbore,18.08.1990 Completed dateExploration 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.
Release dateDate 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.29.12.1992 Publication dateDate 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.25.04.2005 Purpose - plannedPre-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 ReentryStatus 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 ContentFor exploration wellbores, status of discovery.
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.
WATER, CUTTINGS, NOT AVAILABLE, OIL, GAS/CONDENSATE, OIL/GAS, CO2, GAS, WATER/GAS, NOT APPLICABLE.OIL/GAS
Discovery wellboreIndicator 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.YES 1st level with HC, ageAge of lithostratigraphic unit, 1st level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE. See also NPD bulletins.LATE JURASSIC 1st level with HC, formationName 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 NPD bulletins.SOGNEFJORD FM 2nd level with HC, ageAge 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, formationName 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 3rd level with HC, ageAge of lithostratigraphic unit, 3rd level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE.MIDDLE JURASSIC 3rd level with HC, formationName of lithostartigraphic unit, 3rd 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.BRENT GP Kelly bushing elevation [m]Elevation of the rotary kelly bushing (RKB) above mean sea level.17.0 Water depth [m]Depth in metres betweem mean sea level and sea floor.355.0 Total depth (MD) [m RKB]Total measured length of wellbore from kelly bushing to total depth (driller's depth).3127.0 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).3125.5 Maximum inclination [°]Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.5.7 Bottom hole temperature [°C]Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.102 Oldest penetrated ageAge (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 JURASSIC Oldest penetrated formationName 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.STATFJORD GP Geodetic datumReference system for coordinates. Example of legal values: ED50.ED50 NS degreesGeographic coordinate of the wellhead, north-south degrees.61° 1' 59.93'' N EW degreesGeographic coordinate of the wellhead, east-west degrees.3° 32' 53.58'' E NS UTM [m]Universal Transverse Mercator coordinate of the wellhead, north-south.6766782.48 EW UTM [m]Universal Transverse Mercator coordinate of the wellhead, east-west.529620.95 UTM zoneUniversal Transverse Mercator zone. Examples of legal values: 31, 32, 33, 34.31 NPDID wellboreNPD's unique id for the wellbore.1523
Wellbore historyGeneralWell 35/11-4 was designed to drill at a site located in block 35/11 which is situated on the eastern flank of the Viking Graben and northwest of the Horda Platform. The regional structural generally trends north-south, with some north-northeast components. Planned TD was 3317 m, which was prognosed to be near top Triassic. The primary objective for 35/11-4 was the Middle Jurassic Brent Group. Reservoirs were expected in the Tarbert, Ness, Etive and Oseberg formations. Secondary targets were possible sand development of Sognefjord Formation sand in the Late Jurassic as well as Paleocene sand mounds.Operations and resultsWildcat well 35/11-4 was spudded with the dynamically positioned semi-submersible installation Yatzy on 18 August 1990 and drilled to TD at 3127 m in the Early Jurassic Statfjord Formation. Yatzy was the first dynamically positioned drilling unit used offshore Norway and 35/11-4 was the rig's first well. This implied significant rig time spent on testing and down time due to failure of first-time equipment. At a depth of 2072 m one decided to sidetrack the well from 1700 m in order obtain cores from the hydrocarbon bearing zones of the Sognefjord formation. This led to a maximum deviation of 5.7 deg at 1765 m. The well was drilled with seawater and viscous pills down to 1009 m and with KCl/polymer mud from 1009 m to TD.The Lower Eocene consisted of a continuous argillaceous sequence and no reservoir rocks were penetrated. At 1647 m good reservoir quality sandstones were found in the Paleocene Lista Formation but they were not hydrocarbon bearing. Poor shows were observed in limestones of the Cretaceous Shetland Group. A total of four hydrocarbon-bearing zones were discovered in the Jurassic: in the Sognefjord Formation in the original hole and in the Sognefjord, Fensfjord Formations and Brent Group in the sidetrack hole. Mud log shows were recorded in most of the sandstone intervals from 1984 meters to the OWC in the Rannoch Formation at 2687 meters. The log evaluation indicated possible residual hydrocarbon from the OWC down to 2712 meters in the Oseberg Formation, mud logs indicated weak to poor shows over the same interval.Open hole logging, FMT pressure testing and FMT sampling proved movable hydrocarbons. The Upper Sognefjord Formation contained 11.4 meters of gas on top of 5.4 meters of oil with OWC at 2005 meters. The Lower Sognefjord Formation contained 14.6 meters of oil on water with OWC at 2050.5 meters. The Fensfjord contained 5.4 meters of oil in micaceous sandstones. FMT pressure data defined OWC in the Fensfjord at 2310 meters. Sandstones in the Brent Group contain 18.6 meters of gas on oil and 17.1 meters of oil on water. The GOC and OWC were found at 2670 and 2687 meters respectively.Reservoir quality of the sandstones is generally good though some are micaceous. In places the sandstones are very micaceous and the permeability is low. The micaceous zones may even act as barriers to the vertical migration of hydrocarbons particularly in the Sognefjord Formation. This may be one explanation for the separate hydrocarbon accumulations in the formation.Eight cores were cut in the Late and Middle Jurassic reservoirs; five in the Sognefjord Formation (108 m cut with 95% recovery) and three in the Fensfjord Formation (41.5 m cut with 98% recovery). FMT fluid samples were recovered from 1995 meters in the original hole (gas) and from 2000 m, 2038 m, 2290 m, and 2678 m in the sidetrack hole (all oil). A gas/condensate sample was recovered at 2634.5 m. A total of 125 sidewall cores were attempted and 100 were recovered.The well was suspended on 29 December 1990 as an oil and gas discovery.TestingDrill stem testing was planned for a re-entry in 1991.
Cuttings at the NPD
Cuttings at the NPDCuttings available for sampling?YES Cuttings at the NPDCutting sample, top depth [m]Cutting samples, bottom depth [m]1010.003127.00
Cores at the NPD
Cores at the NPDCore sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11977.01981.4[m ]21982.02007.7[m ]32009.02027.8[m ]42033.02057.7[m ]52058.02083.8[m ]62285.02289.8[m ]72293.02300.4[m ]82303.02326.5[m ] Cores at the NPDTotal core sample length [m]135.1 Cores at the NPDCores available for sampling?YES
Palynological slides at the NPD
Palynological slides at the NPDSample depthDepth unitSample typeLaboratory1020.0[m]DCRRI1050.0[m]DCRRI1090.0[m]DCRRI1130.0[m]DCRRI1210.0[m]DCRRI1250.0[m]DCRRI1300.0[m]DCRRI1360.0[m]DCRRI1410.0[m]DCRRI1430.0[m]DCRRI1450.0[m]DCRRI1470.0[m]DCRRI1510.0[m]DCRRI1530.0[m]DCRRI1580.0[m]DCRRI1670.0[m]DCRRI1710.0[m]DCRRI1758.0[m]SWCRRI1790.0[m]SWCRRI1810.0[m]DCRRI1855.0[m]DCRRI1880.0[m]DCRRI1903.0[m]DCRRI1957.0[m]SWCRRI1968.0[m]SWCRRI1970.0[m]DCRRI1975.0[m]DCRRI1980.0[m]CRRI1981.0[m]CRRI1988.0[m]CRRI1990.0[m]SWCRRI2001.0[m]CRRI2003.0[m]SWCRRI2011.0[m]CRRI2014.0[m]CRRI2025.0[m]CRRI2031.0[m]CRRI2036.0[m]CRRI2040.0[m]CRRI2044.0[m]CRRI2067.0[m]CRRI2275.0[m]DCRRI2280.0[m]DCRRI2285.0[m]DCRRI2286.0[m]CRRI2291.0[m]CRRI2295.0[m]CRRI2295.0[m]DCRRI2300.0[m]CRRI2304.0[m]CRRI2307.0[m]CRRI2314.0[m]CRRI2326.0[m]CRRI2530.0[m]DCRRI2540.0[m]DCRRI2545.0[m]DCRRI2610.0[m]DCRRI2620.0[m]DCRRI2790.0[m]DCRRI2865.0[m]DCRRI2875.0[m]DCRRI2925.0[m]DCRRI3120.0[m]DCRRI
LithostratigraphyTop depth [m]Lithostrat. unit372707734139713971448156116461710176018351835190019661966198421162284236526242624265626862707278527852825291830233082
Composite logsDocument nameDocument formatDocument size [MB]0.49
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 nameDocument formatDocument size [MB]2.4944.67
LogsLog typeLog top depth [m]Log bottom depth [m]ACW17852035CBL VDL GR9061935COREGUN GR10132011COREGUN GR19603105COREGUN GR19972920DIFL AC GR10033129DIPOG GR19353129FMT HP GR16502011FMT HP GR19863095FMT HP GR19982634FMT HP GR20000FMT HP GR22900MLL DLL GR19353129MWD - GR RES DIR3543127SWAL GR12903130VELOCITY3723130ZDL CNL GR SL19353129ZDL GR10032043
Casing and leak–off tests
Casing and leak–off testsCasing typeCasing diam.
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30505.036507.00.00LOTINTERM.201002.0261005.01.67LOTINTERM.13 3/81936.017 1/21940.01.88LOTINTERM.9 5/82798.012 1/42800.00.00LOTOPEN HOLE3127.08 1/23127.00.00LOT
Drilling mudDepth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured5051.04WATER BASED20.08.19905091.04WATER BASED21.08.19905091.04WATER BASED22.08.19905091.04WATER BASED23.08.199010091.04WATER BASED27.08.199010091.04WATER BASED27.08.199010091.04WATER BASED28.08.199010091.04WATER BASED29.08.199010091.04WATER BASED30.08.199010091.04WATER BASED31.08.199010091.04WATER BASED03.09.199010091.04WATER BASED05.09.199010091.04WATER BASED06.09.199010091.04WATER BASED07.09.199010091.04WATER BASED10.09.199010091.04WATER BASED10.09.199010091.04WATER BASED10.09.199010091.04WATER BASED11.09.199010091.04WATER BASED13.09.199010091.04WATER BASED14.09.199010091.04WATER BASED17.09.199010091.00WATER BASED18.09.199010091.00WATER BASED19.09.199010091.00WATER BASED20.09.199010091.00WATER BASED21.09.199010091.00WATER BASED24.09.199010091.00WATER BASED24.09.199010091.00WATER BASED24.09.199010091.00WATER BASED25.09.199010091.00WATER BASED27.09.199010091.00WATER BASED28.09.199010091.20WATER BASED01.10.199010091.02WATER BASED02.10.199010091.20WATER BASED03.10.199010091.20WATER BASED05.10.199010091.20WATER BASED08.10.199010091.04WATER BASED27.08.199010091.04WATER BASED04.09.199010091.00WATER BASED26.09.199010091.20WATER BASED02.10.199010091.20WATER BASED04.10.199010141.20WATER BASED08.10.199010361.20WATER BASED08.10.199010641.2022.024.0WATER BASED09.10.199011921.2119.027.0WATER BASED09.10.199011921.20WATER BASED15.10.199012651.20WATER BASED15.10.199012651.21WATER BASED15.10.199015701.2416.022.0WATER BASED16.10.199016601.2217.019.0WATER BASED17.10.199016921.2015.020.0WATER BASED29.10.199016931.22WATER BASED18.10.199017001.2315.020.0WATER BASED26.10.199017181.2015.020.0WATER BASED29.10.199017631.2114.020.0WATER BASED22.10.199017851.2015.020.0WATER BASED29.10.199018221.2115.021.0WATER BASED22.10.199018251.2115.020.0WATER BASED30.10.199019281.2115.020.0WATER BASED31.10.199019411.2115.020.0WATER BASED01.11.199019411.2115.020.0WATER BASED02.11.199019411.2115.020.0WATER BASED06.11.199019741.2115.020.0WATER BASED22.10.199019771.22150.0200.0WATER BASED06.11.199020001.2717.024.0WATER BASED30.11.199020031.10WATER BASED15.01.199220031.10WATER BASED16.01.199220031.10WATER BASED17.01.199220091.22150.0200.0WATER BASED06.11.199020301.22150.0200.0WATER BASED06.11.199020461.10WATER BASED06.01.199220461.10WATER BASED06.01.199220461.10WATER BASED06.01.199220461.10WATER BASED06.01.199220461.10WATER BASED06.01.199220461.10WATER BASED06.01.199220461.10WATER BASED06.01.199220461.10WATER BASED06.01.199220461.10WATER BASED13.01.199220461.10WATER BASED13.01.199220461.10WATER BASED14.01.199220461.10WATER BASED06.01.199220461.10WATER BASED13.01.199220721.20150.020.0WATER BASED23.10.199020721.20150.020.0WATER BASED24.10.199020721.2015.020.0WATER BASED25.10.199020771.2418.024.0WATER BASED07.11.199020851.2418.024.0WATER BASED09.11.199020851.2418.024.0WATER BASED08.11.199021441.2017.026.0WATER BASED12.11.199022841.10WATER BASED12.12.199122841.10WATER BASED17.12.199122841.10WATER BASED17.12.199122841.10WATER BASED17.12.199122841.10WATER BASED17.12.199122841.10WATER BASED19.12.199122841.10WATER BASED19.12.199122841.10WATER BASED23.12.199122841.10WATER BASED23.12.199122841.10WATER BASED23.12.199122841.10WATER BASED24.12.199122841.10WATER BASED27.12.199122841.10WATER BASED27.12.199122841.10WATER BASED31.12.199122841.10WATER BASED31.12.199122841.10WATER BASED31.12.199122841.10WATER BASED17.12.199122841.10WATER BASED20.12.199122841.10WATER BASED27.12.199122851.2116.024.0WATER BASED13.11.199022901.2216.024.0WATER BASED13.11.199023011.2415.022.0WATER BASED15.11.199023851.2417.026.0WATER BASED16.11.199025251.2716.027.0WATER BASED19.11.199026291.2717.024.0WATER BASED27.11.199026291.2717.024.0WATER BASED28.11.199026291.2717.024.0WATER BASED29.11.199026291.2717.024.0WATER BASED19.11.199026291.2717.024.0WATER BASED27.11.199026511.2717.024.0WATER BASED30.11.199026641.2717.024.0WATER BASED03.12.199026831.10WATER BASED05.12.199126831.10WATER BASED09.12.199126831.10WATER BASED09.12.199126831.10WATER BASED10.12.199126831.10WATER BASED06.12.199126831.10WATER BASED09.12.199126981.2717.024.0WATER BASED03.12.199028101.2615.020.0WATER BASED27.12.199028101.2615.020.0WATER BASED27.12.199028101.2615.020.0WATER BASED31.12.199028101.2615.020.0WATER BASED31.12.199028101.2615.020.0WATER BASED31.12.199028101.2615.020.0WATER BASED02.01.199128101.2615.020.0WATER BASED02.01.199128101.2615.020.0WATER BASED07.01.199128101.2615.020.0WATER BASED07.01.199128101.2615.020.0WATER BASED08.01.199128101.2615.020.0WATER BASED08.01.199128101.2615.020.0WATER BASED08.01.199128101.2615.020.0WATER BASED14.01.199128101.2615.020.0WATER BASED14.01.199128101.2615.020.0WATER BASED14.01.199128101.2615.020.0WATER BASED31.12.199028101.2615.020.0WATER BASED07.01.199128221.2817.024.0WATER BASED04.12.199028741.2615.020.0WATER BASED04.12.199029101.2615.020.0WATER BASED05.12.199029101.2615.020.0WATER BASED11.12.199029101.2615.020.0WATER BASED12.12.199029101.2615.020.0WATER BASED14.12.199029101.2615.020.0WATER BASED14.12.199029101.2615.020.0WATER BASED19.12.199030291.2615.020.0WATER BASED19.12.199030291.2615.020.0WATER BASED19.12.199031271.2615.020.0WATER BASED27.12.199031271.2615.020.0WATER BASED19.12.199031271.2615.020.0WATER BASED27.12.199031271.2615.020.0WATER BASED27.12.199031271.2615.020.0WATER BASED27.12.199031271.2615.020.0WATER BASED27.12.199031271.2615.020.0WATER BASED27.12.1990
Pressure plotsThe 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 plotsDocument nameDocument formatDocument size [MB]0.22