General information Attribute ValueWellbore name7228/7-1 ATypeEXPLORATIONPurposeWILDCATStatusP&APress releaseFactmaps in new windowMain areaBARENTS SEADiscoveryWell name7228/7-1Seismic location3D ST 9403- INLINE 1378 & CROSSLINE 1557Production licenceDrilling operatorDen norske stats oljeselskap a.sDrill permit996-LDrilling facilityDrilling days26Entered date08.01.2001Completed date02.02.2001Plugged date02.02.2001Release date02.02.2003Publication date11.02.2003Purpose - plannedWILDCATReentryNOContentOIL/GASDiscovery wellboreYES1st level with HC, ageLATE TRIASSIC1st level with HC, formationSNADD FM2nd level with HC, ageEARLY TRIASSIC2nd level with HC, formationKLAPPMYSS FMKelly bushing elevation [m]24.0Water depth [m]288.0Total depth (MD) [m RKB]2881.0Final vertical depth (TVD) [m RKB]2848.0Maximum inclination [°]19.3Bottom hole temperature [°C]89Oldest penetrated ageEARLY TRIASSICOldest penetrated formationKLAPPMYSS FMGeodetic datumED50NS degrees72° 15' 28.9'' NEW degrees28° 8' 59.7'' ENS UTM [m]8018306.53EW UTM [m]539111.27UTM zone35NPDID wellbore4257
Wellbore historyGeneralWellbore 7228/7-1 A is situated in the Nordkapp basin. The Nordkapp basin is the most pronounced structural element east of Loppa High, with a basinal-axis oriented NE-SW. From top Cretaceous and down to TD of the well the sediments are steeply dipping due to salt diapirism, with the salt diapir located SE of the surface location. Well 7228/7-1S unexpectedly drilled into a Permian block where the target reservoir was prognosed and so did not reach the main target for the planned well. Based on this result it was decided to drill sidetrack 7228/7-1 A. The main objectives of well 7228/7-1 A was to test the hydrocarbon potential of Upper and Middle Triassic sandstones of the Snadd Formation.Operations and resultsWell 7228/7-1 A was kicked off from well 7228/7-1 S T3 below the 13 3/8" casing shoe at 1341 m on 8 January 2001 and drilled with the semi-submersible installation "Transocean Arctic" to a total depth of 2881 m the in Early Triassic (Spathian) Klappmys Formation. The well was drilled with "Glydril" mud (KCl / Polymer / glycol) from kick-off to TD. As in 7228/7-1 S several good reservoir zones were penetrated in the Jurassic section, the Stø Formation, the Nordmela Formation and the Tubåen Formation. The Jurassic reservoirs were water wet as proved in 7228/7-1 S T3. Good reservoir zones were also penetrated in Snadd and Klappmys Formations in the Triassic section. The Lower Carnian sandstones in the Snadd Formation proved to be gas and oil bearing, whilst the Klappmys Formation was gas bearing. This was verified both by shows on cores, logs, samples and laboratory studies of the cores. Both hydrocarbon bearing reservoir zones were cored. Two of these were cut in the Snadd Formation, one in the Kobbe Formation, and one in the Klappmys Formation. Wire line MDT gas samples were taken at 2051.1 m and 2057.5 m, while a MDT oil sample was taken at 2091.1 m. The samples were considered of good quality. Well 7228/7-1 A proved an oil-down-to situation in the Lower Carnian sandstone at 2100 m (2078 m TVD RKB, 2054 m TVD MSL). The gas to oil contact was estimated at approximately 2086 m (2064 m TVD RKB, 2040 m TVD MSL). It was decided to drill a sidetrack in order to verify the oil-water contact. Well 7228/7-1 A was permanently abandoned as an oil and gas discovery on 2 February 2001.TestingNo drill stem test was performed.
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]1344.002880.00
Cores at the NPD
Cores at the NPDCore sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12059.02074.7[m ]22075.12102.8[m ]32455.02457.3[m ]42833.02860.9[m ] Cores at the NPDTotal core sample length [m]73.6 Cores at the NPDCores available for sampling?YES
Palynological slides at the NPD
Palynological slides at the NPDSample depthDepth unitSample typeLaboratory2106.6[m]CICHRON
Oil samples at the NPD
Oil samples at the NPDTest typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableMDT2091.100.00CONDENSATE23.07.2001 - 00:00YESMDT0.000.00CONDENSATE23.07.2001 - 00:00YES
Composite logsDocument nameDocument formatDocument size [KB]0.45
Documents – reported by the production licence (period for duty of secrecy expired)
LogsLog typeLog top depth [m]Log bottom depth [m]CMR ECS HNGS ACTS20232115DSI FMI GR13232881HRLA PEX HNGS ACTS13232881MDT ACTS GR13982493MDT GR20872091MWD MPR13412059VSP GR8711322VSP GR12452873
Casing and leak–off tests
Casing and leak–off testsCasing typeCasing diam.
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30372.036373.00.00LOTINTERM.20502.026503.01.62LOTINTERM.13 3/81323.017 1/21325.01.73LOTOPEN HOLE2881.012 1/42881.00.00LOT
Drilling mudDepth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured15401.3519.0GLYDRILL17641.3518.0GLYDRILL20041.3421.0GLYDRILL20451.3519.0GLYDRILL20981.3520.0GLYDRILL21021.3520.0GLYDRILL22241.3519.0GLYDRILL28331.4327.0GLYDRILL28561.4326.0GLYDRILL28611.4327.0GLYDRILL28811.4528.0GLYDRILL
Thin sections at the NPD
Thin sections at the NPDDepthUnit2100.75[m ]2841.30[m ]2843.80[m ]2853.45[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 [KB]0.28