7120/1-3
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General information
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Wellbore history
GeneralWell 7120/1-3 was drilled on the Gotha prospect on the southern end of the Loppa High in the Barents Sea, ca 1.8 km south-west from well 7120/1-1. An 8 ½" pilot hole was drilled from seabed at 366 m to 665 m to check for shallow gas, which was not observed. The primary objective was to test the reservoir properties and hydrocarbon potential in sandstones of the Snadd Formation and in karstified carbonate at the top of the Permian Røye Formation. The secondary objective was to test a 10 m sandstone sequence at the top of the Kobbe Formation.Operations and resultsWildcat well 7120/1-3 was spudded with the semi-submersible installation Transocean Arctic on 16 July 2013 and drilled to TD at 2542 m in the Permian Røye Formation. The well was drilled with seawater and hi-vis sweeps down to 665 m and with KCl/Polymer/GEM water based mud from 665 m to TD.The well encountered sandstones in the Gotha Snadd target, but the reservoir proved water filled and the reservoir properties were found to be on the low side. The expected Kobbe Formation sandstone was poorly developed with only a tight siltstone present. Permian karstified carbonates were penetrated at 2281 m. These carbonates contained a gas column of 34 meters (GOC at 2310.3 m) and an oil column of 75 meters (OWC at 2389 m).First oil show was observed in a sandstone at 700 m in the Fruholmen Formation. A second interval in the Fruholmen Formation, from 770 to 780 m also had weak oil shows. Weak oil shows were described from 1758 to 1835 m in the Snadd Formation. The Røye Formation had oil shows throughout the petroleum-bearing reservoir. Oil shows (fluorescence, but no stain or odour) continued below the OWC down to TD in the well.A total of 50.15 m core (86% recovery) was recovered in six successive cores in the interval 2288.5 to 2346.8 m in the karstified carbonates. The core to log depth shifts for cores 1 to 6 were -3.25 m, -3.57 m, -3.67 m, -4.53 m, -4.91 m, and -4.91 m, respectively. RCI fluid samples were taken at 2305.5 m (gas), 2315.7 m (oil), 2361.6 m (oil), and 2477.5 m (water).The well was permanently abandoned on 7 October 2013.TestingA drill stem test was conducted over the interval 2336.8 to 2377.3 m in the Røye Formation carbonates. The DST produced after acid treatment of the formation approximately 683 Sm3 oil and 220000 Sm3 gas /day through a 44/64" The GOR was 322 Sm3/Sm3. The DST temperature at 2349 m was 91.2 °C. This was the first successful DST in Permian carbonates on the Norwegian Continental Shelf. The main flow of the reservoir was stable over 24 hours and confirmed good production properties of the reservoir. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]670.002542.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12288.52292.2[m ]22293.52293.9[m ]32293.92307.7[m ]42310.02336.1[m ]52336.52341.7[m ]62344.02345.2[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]50.3Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory670.0[m]DCROBERTSO680.0[m]DCROBERT700.0[m]DCROBERT720.0[m]DCROBERT740.0[m]DCROBERT760.0[m]DCROBERT780.0[m]DCROBERT800.0[m]DCROBERT820.0[m]DCROBERT840.0[m]DCROBERT860.0[m]DCROBERT880.0[m]DCROBERT900.0[m]DCROBERT920.0[m]DCROBERT940.0[m]DCROBERT960.0[m]DCROBERT980.0[m]DCROBERT1000.0[m]DCROBERT1020.0[m]DCROBERT1040.0[m]DCROBERT1060.0[m]DCROBERT1080.0[m]DCROBERT1100.0[m]DCROBERT1120.0[m]DCROBERT1140.0[m]DCROBERT1160.0[m]DCROBERT1180.0[m]DCROBERT1200.0[m]DCROBERT1220.0[m]DCROBERT1240.0[m]DCROBERT1260.0[m]DCROBERT1280.0[m]DCROBERT1300.0[m]DCROBERT1320.0[m]DCROBERT1340.0[m]DCROBERT1360.0[m]DCROBERT1380.0[m]DCROBERT1400.0[m]DCROBERT1420.0[m]DCROBERT1440.0[m]DCROBERT1460.0[m]DCROBERT1480.0[m]DCROBERT1500.0[m]DCROBERT1520.0[m]DCROBERT1540.0[m]DCROBERT1560.0[m]DCROBERT1580.0[m]DCROBERT1600.0[m]DCROBERT1620.0[m]DCROBERT1640.0[m]DCROBERT1661.0[m]DCROBERT1679.0[m]DCROBERT1700.0[m]DCROBERT1718.0[m]DCROBERT1736.0[m]DCROBERT1754.0[m]DCROBERT1772.0[m]DCROBERT1790.0[m]DCROBERT1808.0[m]DCROBERT1826.0[m]DCROBERT1844.0[m]DCROBERT1862.0[m]DCROBERT1880.0[m]DCROBERT1898.0[m]DCROBERT1916.0[m]DCROBERT1934.0[m]DCROBERT1952.0[m]DCROBERT1970.0[m]DCROBERT1988.0[m]DCROBERT2006.0[m]DCROBERT2024.0[m]DCROBERT2042.0[m]DCROBERT2060.0[m]DCROBERT2078.0[m]DCROBERT2096.0[m]DCROBERT2114.0[m]DCROBERT2132.0[m]DCROBERT2150.0[m]DCROBERT2168.0[m]DCROBERT2186.0[m]DCROBERT2216.0[m]DCROBERT2222.0[m]DCROBERT2240.0[m]DCROBERT2258.0[m]DCROBERT2273.0[m]DCROBERT2276.0[m]DCROBERT2285.0[m]DCROBERT2289.0[m]CAPT2290.1[m]CAPT2299.7[m]CAPT2302.7[m]CAPT2334.5[m]CAPT2340.3[m]CAPT -
Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableDST2315.700.00OIL04.09.2013 - 00:00YESDST2361.600.00OIL04.09.2013 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit366366436436689689110122032203224422812281 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02336237717.5Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.041Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0683220000322 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CN ZDL RTEX MLL GR21332525MAXCOR GR16202164MREX FLEX GR21752525MWD - PWD GR RES NEU DEN SON DIR3452538PCOR GR21952495RCX GR22042478RCX GR23002482RCX GR 6CAL17191826STAR UXPL XMAC GR21722524VSP GR10652510 -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30430.036435.00.00SURF.COND.20660.026665.01.35FITINTERM.9 5/81613.012 1/41622.01.32LOTLINER72175.08 1/22177.01.34LOTLINER52449.062542.01.51LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3781.031.0Water Based3981.031.0Water Based4871.031.0Water Based6651.1110.0Water Based12761.1612.0Water Based16220.0016.0Water Based20100.0018.0Water Based21771.2122.0Water Based22211.2726.0Water Based24491.1413.0Water Based24491.1113.0Water Based25420.0013.0Water Based