16/3-7
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Brønnhistorie
GeneralWell 16/3-7 was drilled to appraise the southeast flank of the Joan Sverdrup Field on the Utsira High in the North Sea. It is located approximately 2.8 km southeast of the appraisal well 16/3-5 and approximately 4.2 km south-west of the exploration well 16/3-2. The objectives were to determine the presence and thickness of the Upper Jurassic Draupne shale and Draupne sandstone, to calibrate the seismic interpretation and depth conversion, and find the free-water level. The well should also investigate the reservoir properties in the Permian.Operations and resultsAppraisal well 16/3-7 was spudded with the semi-submersible installation Bredford Dolphin on 30 September 2013 and drilled to TD at 2100 m, 12 m into granitic basement rock. A 9 7/8" Pilot Hole section was drilled from Seabed to 711 m. No shallow gas was observed while drilling the pilot hole or while opening it up to 36". No significant problem was encountered in the operations. The well was drilled with seawater and hi-vis sweeps down to 711 m and with Aquadril glycol mud from 711 m to TD.The Draupne Formation shale section was encountered at 1937 m and was 13 m thick. The Intra Draupne Formation Sandstone was encountered at 1949 m, which was 12 m deep to prognosis. It was 14 m thick and of excellent quality. Live oil was proved in the uppermost part, but the reservoir was encountered almost completely in the water zone. Sampling indicated that the oil-water contact is at or near 1950 m. Permian carbonates, belonging to the Zechstein Group, were encountered at 1963 m, directly under the Jurassic section. The 36 m thick dolomitic carbonate reservoir has moderate to good reservoir properties. The pressure measurements confirmed the reservoir to be in the same pressure regime as the Johan Sverdrup discovery and the well showed a common water gradient in both the sandstone and Permian carbonates, demonstrating good communication between the two reservoirs. The carbonate reservoir is resting on a two meter thick Kupferschiefer, which in turn rests on 89 m of sandstone and conglomerate belonging to the Rotliegendes Group. Oil shows continued below the thin live oil, throughout the Intra Draupne Formation sandstones, the Zechstein carbonates and a few meters into the Rotliegendes Group.A total of 35.7 m core was recovered in two cores from the interval 1935.5 to 1977.5 m (85% overall recovery).The cores captured most of the Draupne Formation shale, parts of the Intra Draupne Formation sandstone reservoir, and 15 m of the Zechstein Group carbonate. The core to log depth shift was +0.3 m for core 1 and -0.32 m for core 2. RCX fluid samples were taken at 1949.9 m (water and oil), 1950 m (water and trace oil), 1952 m (water), 1952.1 m (water), and 1967 m (water).The well was permanently abandoned on 8 November 2013 as an oil appraisal well.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]720.002099.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet11935.51954.8[m ]21961.01977.5[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]35.7Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
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 formasjonstestCONDUCTOR30221.036223.00.00SURF.COND.20704.026711.01.75FITPILOT HOLE711.09 7/8711.00.00OPEN HOLE716.017 1/2716.00.00INTERM.9 5/81820.012 1/41828.01.73LOTOPEN HOLE2100.08 1/22100.00.00 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]MRCH JAR TTRM DSL CN ZDL MLL RTE18212099MRCH JAR TTRM DSL FLEX MREX18212093MRCH JAR TTRM DSL XMACF1 STAR OR18212092MRCH JAR TTRM GR COR PCOR19342029MRCH JAR TTRM R6TC IFX RLVP GR19491996MRCH JAR TTRM R6TC IFX VIT RCX R19521952MTCH GR GW9622068MWD - GR ECD RES DIR SON340708MWD - PWD GR RES DIR18201932MWD - RES GR PWD DIR CAL DEN NEU7081811PWD GR RES DIR DEN CAL NEU SON18202097 -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet14277986187587592012861324132413531358143414521452147115381686170317361776177618671890193719371950196319631998200020002089 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling1581.03100.0Water Based2241.04100.0Water Based7041.1321.0Water Based17321.4024.0Water Based18321.4016.0Water Based21001.1524.0Water Based21001.1525.0Water Based