7234/6-1
Eksport: PDF
-
Generell informasjon
-
Brønnhistorie
GeneralWell 7234/6-1 was drilled to test the Stangnestind prospect on the western flank of the Fedynsky High, 12 km from the Russian border. The primary objective was to explore the hydrocarbon potential of the untested play in Late Carboniferous to Early Permian carbonate intervals of the rn Formation, Gipsdalen Group.Operations and resultsAn 8 1/2" pilot well, 7234/6-U-1, was spudded on 31 May 2021, 25 m west of the main bore to check for shallow gas, check out unknown shallow lithology in the Lower Cretaceous wedge and to serve as a data acquisition well in the shallow part of the stratigraphy at Stangnestind. The pilot hole was drilled to 672 m. No shallow gas or water flow was detected and a safe setting depth for the 20" casing in the main bore was established.Wildcat well 7234/6-1 was spudded with the semi-submersible installation Deepsea Nordkapp on 1 June 2021 and drilled to TD at 4035 m (4041 m loggers depth) m in the rn Formation of Late Carboniferous to Early Permian age. Severe losses up to 60 m3/h occurred at TD. The well was stabilized, and logging commenced successfully. The well was drilled with seawater and hi-vis pills down to 630 m, with KCl water-based mud from 630 m to 3618 m, and with BaraECD 2.2 oil-based mud from 3618 m to TD.The well encountered dolomitised limestone reservoir (intra rn Formation) at 3915 m and detected a 57 m column of dry gas. The gas contained 13 % CO2 and 15.9 % H2S. No wells on the Norwegian continental shelf have previously seen any H2S level close to this. 26 m of the reservoir zone had relatively good reservoir properties (average porosity of 14%). Although the gas-water contact was not seen on logs, an MDT-sample at 4012,6 m proved water below the gas column. The well also encountered several thin, gas-bearing sandstone layers in the Triassic. Approximate drillers depth for these intervals are 1340-1350 m, 1563-1573 m, 1646-1650 m,1735-1750 m, 1955-2072 m (several intervals), 2570-2580 m, 2791-2815 m. These sands have moderate to low gas saturations and moderate reservoir properties. The sands at 1563 to 1573 m had direct dull straw yellow fluorescence and a very slow diffuse milky cut, otherwise no oil shows above the OBM background was observed on cuttings from the well.No cores were cut. MDT fluid samples were taken at 3973.1 m (gas), 3982.5 m (gas) and 4012.6 m (water).The well was permanently abandoned on 19 July 2021 as small gas discovery.TestingNo drill stem test was performed. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]633.004024.00 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet2803026336826827087307307601202172917293711371137583880388039083908 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CMR HNGS9721600LWD - GR RES DIR INC APWD520746LWD - INCL480520LWD - NBGR NBRES DIR INC RES APW7461600MDT LFA MRMS PA9851585PEX NEXT SS AIT450973RTS SS NEXT PEX9721600USIT CBL698960 -
Foringsrør og formasjonsstyrketester
Foringsrør og formasjonsstyrketester Type utforingUtforing diam.
[tommer]Utforing dybde
[m]Brønnbane diam.
[tommer]Brønnbane dyp
[m]LOT/FIT slam eqv.
[g/cm3]Type formasjonstestINTERM.30332.636336.00.00INTERM.20623.126630.02.16LOTINTERM.13 3/81900.317 1/21910.01.41FITINTERM.9 5/83604.012 1/43618.01.72FITOPEN HOLE4035.08 1/24035.00.00 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling2851.0323.8Water3331.3023.5Water5201.033.0Water6231.1418.0Water11401.1614.0Water19101.1522.0Water20991.167.7Water28461.1713.4Water34431.1611.0Water35741.429.5Oil36181.309.5Oil36181.1613.4Water37401.427.2Oil37401.397.2Oil39211.397.2Oil40361.416.7Oil