General information Attribute Value Wellbore nameOfficial name of wellbore based on NPD guidelines for designation of wells and wellbores.2/12-1 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.
P&AFactmaps 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 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.2/12-1 Seismic locationPosition of spud location on seismic survey lines. SP: shotpoint.NP 85C - 81 SP. 2293 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.Norsk Hydro Produksjon AS Drill permitThe drilling permit number together with the version of the drilling permit as stated in the drilling permit granted by the NPD.530-L Drilling facilityNPD's name of the facility which the wellbore was drilled from. Drilling daysNumber of days from wellbore entry to wellbore completion.150 Entered dateThe date when he wellbore was spudded. For sidetracks: The date when new formation was drilled by kicking off from the mother-wellbore,14.10.1986 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.12.03.1989 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.26.10.2009 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
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.ULA FM Kelly bushing elevation [m]Elevation of the rotary kelly bushing (RKB) above mean sea level.23.0 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).4795.0 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).4793.0 Maximum inclination [°]Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.4.4 Bottom hole temperature [°C]Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.151 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 PERMIAN 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.ROTLIEGEND GP Geodetic datumReference system for coordinates. Example of legal values: ED50.ED50 NS degreesGeographic coordinate of the wellhead, north-south degrees.56° 14' 4.07'' N EW degreesGeographic coordinate of the wellhead, east-west degrees.3° 42' 27.5'' E NS UTM [m]Universal Transverse Mercator coordinate of the wellhead, north-south.6232538.56 EW UTM [m]Universal Transverse Mercator coordinate of the wellhead, east-west.543868.06 UTM zoneUniversal Transverse Mercator zone. Examples of legal values: 31, 32, 33, 34.31 NPDID wellboreNPD's unique id for the wellbore.1014
Wellbore historyGeneralWell 2/12-1 is located in the Feda Graben n the southern North Sea, ca 1.5 m north of the Danish/Norwegian border. The main objective of the well was to prove the extension of the Danish "Gert" discovery into block 2/12. The primary target was Middle Jurassic sandstones, prognosed at 4826 m. Possible secondary targets were Early Jurassic and Triassic sandstones. Structural closure was not defined at Top Shetland or Base Cretaceous levels, but minor stratigraphic trapping was considered possible in this area. Prognosed TD was 5125 m.Operations and resultsWildcat well 2/12-1 was spudded with the semi-submersible installation Treasure Scout on 14 October 1986 and drilled to TD at 4795 m in volcanic breccia of the Early Permian Rotliegend Group. Drilling proceeded without significant problems down to 3970 m where gas problems were experienced. The hole was cleaned up, and dual induction/sonic log was run. Due to increasing gas recordings 9 5/8" casing was set at 3978 m. The remaining logging program in this section was therefore not run, and sidewall cores were not taken. At 4705 m a drill- break was experienced. The hole was circulated, tested, and drilled to 4714 m. During logging the tool got stuck and the string was cut. The fish was stuck at 3842 m, and loosening was unsuccessful. 7" liner was set at 3826 m and cemented. During circulation hydrocarbons started to flow in between 9 5/8" shoe and 7" liner. The well was closed and heavy mud was squeezed into the formation. After 3 weeks the fish was pulled out of the hole. The well was drilled with spud mud down to 1015 m, with KCl/polymer mud from 1015 m to 4050 m, and with Lignosulphonate mud from 4050 m to TDWell 2/12-1 encountered 71 m of oil bearing Late Jurassic Ula Formation sandstone from 4597 - 4668 m. The top of the reservoir was 229 m shallower than originally prognosed. The gross sand interval of 71 m contained 56.6 m net sand. The sandstone was generally clean, very fine to fine grained and well sorted. No Free Water level (FWL) was observed down to the sandstone/shale lower reservoir boundary at 4668 m. The oil gradient is the same as for the Gert-1 well.Oil shows were reported from carbonates in the Late Cretaceous (at the base of the Hidra Formation) from 3895 to 3917 m, the Early Cretaceous (Åsgard Formation) from 3955 to 3988 m, and the Late Permian Zechstein Group from 4674.5 to 4684.5 m. Petrophysical analysis showed no net pay intervals in the Cretaceous sections but for the Permian limestones, out of a gross total interval of 6.5 m carbonate section a net reservoir interval of 4 m with a net pay of 1.1 m was defined. For this net pay interval an average porosity of 7.8 % and a water saturation of 35 % were calculated. Shows were also reported on claystones, dolomites, limestones, siltstones, and thin sandstone stringers at 3988 - 4610 m in the Farsund and Haugesund Formations.Three conventional cores were cut over the interval 4633 m to 4673.5 m (driller's depth). Coring started in the Ula Formation consisting of sandstone with basal coal, shale and conglomerate. It continued through 2.5 m of ?Triassic claystone and stopped in late Permian claystones and limestones at 4673.5 m. RFT wire line fluid samples were taken at 4645.4 m (gas and water/mud filtrate) and at 4610.1 (gas, oil, and water/mud filtrate) .The well was permanently abandoned on 12 March 1987as an oil and gas discovery.TestingTwo DST tests were performed in the Ula Formation.DST 1 was performed from the interval 4630 - 4647 m. It produced 1051 Sm3 oil and 176400 Sm3 gas /day on a 9.54 mm choke. The GOR was 168 Sm3/Sm3, the oil density was 0.828 and the gas gravity was 0.835 (air = 1) with 0.5 % CO2 and 5 ppm H2S. The bottom hole temperature, measured at 4642.3 m, was 147.5 deg C.DST 2 was performed from the interval 4600 - 4612 m. It produced 1629 Sm3 oil and 213600 Sm3 gas /day on a 14.29 mm choke. The GOR was 131 Sm3/Sm3, the oil density was 0.828 and the gas gravity was 0.828 (air = 1) with 1.5 % CO2 and 0 ppm H2S. The bottom hole temperature, measured at 4581.92 m, was 148.1 deg C.
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]1020.004795.00
Cores at the NPD
Cores at the NPDCore sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14633.04650.9[m ]24651.04660.5[m ]34662.04672.5[m ] Cores at the NPDTotal core sample length [m]37.9 Cores at the NPDCores available for sampling?YES
Palynological slides at the NPD
Palynological slides at the NPDSample depthDepth unitSample typeLaboratory2663.3[m]CHRS3970.0[m]SWCOD3996.0[m]SWCRRI3997.0[m]DCOD4010.0[m]DCOD4020.0[m]DCOD4030.0[m]DCOD4040.0[m]SWCRRI4050.0[m]DCOD4060.0[m]DCOD4070.0[m]DCOD4080.0[m]DCOD4090.0[m]DCOD4105.0[m]SWCRRI4120.0[m]DCOD4135.0[m]DCOD4150.0[m]DCOD4172.0[m]SWCRRI4190.0[m]DCOD4210.0[m]DCOD4220.0[m]SWCRRI4240.0[m]DCOD4260.0[m]DCOD4280.0[m]DCOD4300.0[m]DCOD4320.0[m]DCOD4330.0[m]DCOD4340.0[m]DCOD4350.0[m]DCOD4370.0[m]DCOD4390.0[m]DCOD4400.0[m]DCOD4400.0[m]SWCRRI4420.0[m]DCOD4420.0[m]SWCRRI4440.0[m]DCOD4460.0[m]DCOD4470.0[m]DCOD4470.0[m]SWCRRI4490.0[m]DCOD4500.0[m]DCOD4520.0[m]DCOD4540.0[m]DCOD4550.0[m]DCOD4560.0[m]DCOD4570.0[m]DCOD4580.0[m]DCOD4590.0[m]DCOD4607.0[m]DCOD4607.0[m]SWCRRI4627.0[m]DCOD4628.0[m]SWCRRI4633.5[m]COD4635.6[m]COD4638.4[m]COD4640.0[m]COD4641.0[m]COD4643.5[m]COD4644.5[m]COD4653.3[m]COD4654.4[m]COD4657.7[m]COD4660.0[m]COD4660.2[m]COD4660.3[m]COD4660.4[m]COD4663.3[m]COD4663.9[m]COD4668.1[m]DCHRS4668.1[m]CHRS4668.7[m]COD4687.0[m]SWCRRI
Oil samples at the NPD
Oil samples at the NPDTest typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableDSTDST14630.004647.0022.12.1986 - 00:00YESDSTDST24600.004612.0018.12.1986 - 00:00YES
LithostratigraphyTop depth [m]Lithostrat. unit93159429852985299430453084310731073125335836983709391739173955398839884365459745974672467246744684
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]10.633.95
Drill stem tests (DST)
Drill stem tests (DST)Test numberFrom depth MD
[m]To depth MD
Drill stem tests (DST)Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
Drill stem tests (DST)Test numberOil
[g/cm3]Gas grav. rel.airGOR
LogsLog typeLog top depth [m]Log bottom depth [m]CBL VDL16234656CST39804714DIL BHC LSS SP GR28854797DLL MSFL SP GR39764713LDL CNL CAL GR28674716MWD - GR RES DIR923986MWD - GR RES DIR40234633RFT45284651RFT45994707RFT46104610SHDT GR39764717TEMP ASNT30004658VSP11004790
Casing and leak–off tests
Casing and leak–off testsCasing typeCasing diam.
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30178.036178.00.00LOTSURF.COND.20998.0261015.01.70LOTINTERM.13 3/82500.017 1/22515.02.02LOTINTERM.9 5/83978.012 1/43986.02.21LOTLINER74714.08 1/24716.02.42LOTOPEN HOLE4795.064795.00.00LOT
Drilling mudDepth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1231.0321.05.0WATER BASED12.03.19871781.25WATER14.10.19863191.05WATER16.10.19868951.8221.05.0WATER10.03.19878951.8221.05.0WATER BASED11.03.19879441.05WATER17.10.198610151.03WATER20.10.198610150.0010.06.0WATER20.10.198610150.006.09.0WATER20.10.198610150.006.09.0WATER21.10.198613481.2126.012.0WATER22.10.198615981.6029.017.0WATER23.10.198619051.6040.013.0WATER26.10.198620001.6049.017.0WATER26.10.198622471.6043.017.0WATER26.10.198622571.6038.017.0WATER27.10.198623871.6040.016.0WATER28.10.198624481.6038.016.0WATER29.10.198625151.6038.016.0WATER30.10.198625151.6040.013.0WATER BASED02.11.198625151.6037.012.0WATER BASED02.11.198626501.6025.09.0WATER BASED02.11.198628741.6034.010.0WATER BASED03.11.198629611.6025.010.0WATER BASED04.11.198630591.6032.09.0WATER BASED05.11.198631231.6030.010.0WATER BASED06.11.198632101.6033.010.0WATER BASED11.11.198632201.6032.010.0WATER BASED11.11.198632331.6032.011.0WATER BASED11.11.198633061.6033.012.0WATER BASED09.11.198633231.6032.011.0WATER BASED12.11.198634161.6032.010.0WATER BASED13.11.198635351.6033.012.0WATER BASED14.11.198636361.6031.011.0WATER BASED17.11.198636781.6031.011.0WATER BASED17.11.198637501.8223.06.0WATER09.03.198737800.00WATER27.02.198737802.1435.06.0WATER26.02.198737800.0055.09.0WATER02.03.198737821.6032.011.0WATER BASED17.11.198638511.6031.011.0WATER BASED18.11.198638741.6030.010.0WATER BASED19.11.198638801.6030.010.0WATER BASED20.11.198639001.6030.011.0WATER BASED21.11.198639011.6030.09.0WATER BASED24.11.198639181.6028.09.0WATER BASED24.11.198639541.6028.09.0WATER BASED24.11.198639601.6028.08.0WATER BASED25.11.198639861.6633.08.0WATER BASED26.11.198639861.8238.09.0WATER BASED25.11.198639861.8237.09.0WATER BASED30.11.198639861.8237.08.0WATER BASED30.11.198639861.9839.09.0WATER BASED02.12.198639861.8237.09.0WATER BASED27.11.198640191.9840.08.0WATER BASED02.12.198640251.9839.08.0WATER BASED03.12.198640501.9840.010.0WATER BASED04.12.198640652.0239.010.0WATER BASED06.12.198640892.0539.08.0WATER BASED06.12.198641552.0538.09.0WATER BASED06.12.198642292.0535.08.0WATER BASED08.12.198643052.2343.08.0WATER05.03.198743050.0050.05.0WATER09.03.198743050.0046.05.0WATER09.03.198743050.0050.06.0WATER09.03.198743082.0536.08.0WATER BASED09.12.198644022.0534.08.0WATER BASED10.12.198644202.2343.06.0WATER03.03.198744200.0060.05.0WATER05.03.198744822.0735.08.0WATER BASED11.12.198645572.0733.07.0WATER BASED14.12.198645672.1433.05.0WATER25.02.198745670.0038.05.0WATER02.03.198745670.0046.04.0WATER02.03.198746092.1233.07.0WATER BASED14.12.198646182.1429.07.0WATER13.02.198746180.0026.05.0WATER13.02.198746180.0029.06.0WATER18.02.198746180.0028.06.0WATER18.02.198746180.0032.07.0WATER19.02.198746180.0027.05.0WATER20.02.198746180.0028.05.0WATER24.02.198746180.0055.06.0WATER24.02.198746180.0036.05.0WATER24.02.198746180.0049.05.0WATER24.02.198746180.0026.05.0WATER18.02.198746252.1430.07.0WATER11.02.198746332.1227.05.0WATER BASED14.12.198646332.1226.05.0WATER BASED15.12.198646332.1427.05.0WATER BASED16.12.198646512.1427.05.0WATER BASED17.12.198646612.1426.05.0WATER BASED18.12.198646682.1428.04.0WATER BASED20.12.198646772.1432.05.0WATER02.02.198746770.0031.05.0WATER03.02.198746770.0030.05.0WATER04.02.198746770.0029.05.0WATER09.02.198746770.0028.05.0WATER09.02.198746770.0027.05.0WATER09.02.198746770.0026.07.0WATER10.02.198746902.1427.04.0WATER BASED20.12.198647142.1429.04.0WATER BASED23.12.198647142.1429.04.0WATER BASED29.12.198647142.1429.04.0WATER BASED30.12.198647142.1425.04.0WATER BASED30.12.198647142.1432.014.0WATER BASED30.12.198647142.1430.013.0WATER BASED02.01.198747142.1430.012.0WATER BASED02.01.198747142.1443.016.0WATER BASED05.01.198747142.1435.016.0WATER BASED05.01.198747142.1434.015.0WATER BASED05.01.198747142.1433.09.0WATER BASED09.01.198747140.0034.08.0WATER09.01.198747140.0032.07.0WATER12.01.198747140.0029.07.0WATER13.01.198747140.0028.07.0WATER14.01.198747140.0029.07.0WATER15.01.198747140.0030.07.0WATER16.01.198747140.0030.07.0WATER19.01.198747140.0026.06.0WATER19.01.198747140.0027.06.0WATER19.01.198747140.0029.06.0WATER20.01.198747140.0026.06.0WATER21.01.198747140.0028.06.0WATER22.01.198747140.0029.07.0WATER23.01.198747140.0032.05.0WATER26.01.198747140.0031.05.0WATER26.01.198747140.0033.06.0WATER26.01.198747142.1428.04.0WATER BASED23.12.198647142.1426.03.0WATER BASED30.12.198647142.2530.018.0WATER BASED02.01.198747142.1435.016.0WATER BASED06.01.198747142.1436.017.0WATER BASED07.01.198747162.1431.05.0WATER27.01.198747212.1431.05.0WATER28.01.198747472.1434.05.0WATER29.01.198747782.1433.05.0WATER30.01.198747952.1434.05.0WATER02.02.1987
Thin sections at the NPD
Thin sections at the NPDDepthUnit4637.00[m ]4646.00[m ]4656.00[m ]4662.00[m ]4665.00[m ]4671.00[m ]
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]0.21