16/2-12
Export:
PDF
![PDF icon](https://factpages.sodir.no/Images/file-pdf.png)
-
General information
-
Wellbore history
GeneralWell 16/2-12 was drilled on the Geitungen Prospect on the Utsira High in the North Sea. The prospect is situated on a basement terrace north-west of the Johan Sverdrup Field. The main objectives were to investigate the hydrocarbon potential, reservoir quality, and lateral distribution of Intra-Draupne Formation sandstones, and the underlying sandstones of the Hugin and Sleipner Formations. The secondary objectives were to explore the hydrocarbon potential and reservoir properties in the fractured granitic Basement.Operations and resultsWell 16/2-12 was spudded with the semi-submersible installation Ocean Vanguard on 25 July 2012 and drilled to TD at 2067 m in granite Basement. There was a pre-drill shallow gas warning at 707 m, ca 100 m below 20” casing shoe, but no gas was observed when drilling. The well was drilled with seawater down to 211 m and with PerformaDril water based mud from 211 m to TD.The well penetrated rocks of Quaternary, Neogene, Paleogene, Cretaceous and Jurassic age. No indication of hydrocarbons were recorded above top Intra Draupne Formation sandstone, which was picked at 1894 m, 12 m deeper than prognosed. The reservoir had excellent reservoir properties and contained oil. The top of the Basement was picked at 1938 m, 5 m deeper than prognosed. The fractures in the uppermost part of Basement were oil-filled. The oil/water contact was not encountered, but pressure measurements indicate a connection between this segment and the rest of the Johan Sverdrup discovery. Extensive data acquisition and sampling was carried out. The gas/oil ratio is 51.8 Sm3/Sm3 and the oil density is estimated at 0.81 g/cm3 in the Intra-Draupne reservoir.Four cores were cut in the interval 1893 m to 1951.7 m, covering the whole Jurassic interval and 13.7 m of the Basement. The difference between the cores depth and wireline logs depth is less than 50 cm. Core 1 was dripping with oil and had excellent shows. The same type of shows continued on core 2 down to 1930 m. From 1930 – 1940 m, the shows disappeared. From 1940 m, oil was observed in fractures in the granitic Basement. Due to less fractures in core 4 shows disappeared. The deepest indication of weak shows were seen at 1950 m.Reservoir fluid samples were obtained at four depths, with three MDT runs in the well. Large diameter probe was used on MDT wireline runs 5 and 7, and dual straddle packer was used on MDT wireline Run 8. In Run 5, samples were taken in Intra-Draupne Formation sandstone at 1901.3 m (oil) and in the Basement at 1940.0 m (oil with water and filtrate). In Run 7 samples were taken in Intra-Draupne Formation sandstone at 1928.3 m (oil), In Run 8 samples were taken in the Basement at 1940.1 m (oil with water and filtrate) and at 1945 m (water).The well was permanently abandoned on 6 September 2010. It was planned and drilled as a wildcat well. However, after performing data acquisition, and acquiring formation pressure testing data in the reservoir section, the well was reclassified as an appraisal of the Johan Sverdrup field.TestingFormation tests (mini-DST) were conducted in the bedrock, revealing stable flow rates of both oil and water in different levels in the fractured and weathered bedrocks. -
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]615.002067.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11893.01919.4[m ]21920.01942.8[m ]31942.81947.1[m ]41947.11951.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]58.1Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 availableMDT1901.300.00OILYESMDT1928.300.00OILYESMDT1940.000.00OILYES -
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 typeCONDUCTOR30211.036215.00.00SURF.COND.20602.026610.01.56LOTINTERM.13 3/81213.017 1/21223.01.69LOTINTERM.9 5/81673.012 1/41676.01.56LOTOPEN HOLE2067.08 1/22067.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CMR ECS GR16732064FMI HNGS HRLA16732067LWD - ARCVRES6 GVR6 TELE16761893LWD - ARCVRES6 TELE18932067MDT18951940MSIP GPIT PEX12312056MWD - ARCVRES8 PDX5 TELE12131676MWD - ARCVRES9 TELE2111223PEX DSI5251215VSP6002067 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit137772846897906107815301530155115871665167216721678174718011803181718171873188318941894193019301939 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1491.3510.0Spud Mud6101.3036.0Performadril9731.3033.0Performadril12421.3533.0Performadril13941.2433.0Performadril16761.3535.0Performadril18931.2029.0Performadril19471.2134.0Performadril19521.2234.0Performadril20671.2031.0Performadril -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory615.0[m]DCFUGRO630.0[m]DCFUGRO650.0[m]DCFUGRO670.0[m]DCFUGRO690.0[m]DCFUGRO710.0[m]DCFUGRO730.0[m]DCFUGRO750.0[m]DCFUGRO770.0[m]DCFUGRO790.0[m]DCFUGRO810.0[m]DCFUGRO830.0[m]DCFUGRO850.0[m]DCFUGRO870.0[m]DCFUGRO890.0[m]DCFUGRO910.0[m]DCFUGRO930.0[m]DCFUGRO950.0[m]DCFUGRO970.0[m]DCFUGRO990.0[m]DCFUGRO1010.0[m]DCFUGRO1030.0[m]DCFUGRO1050.0[m]DCFUGRO1100.0[m]DCFUGRO1120.0[m]DCFUGRO1140.0[m]DCFUGRO1160.0[m]DCFUGRO1180.0[m]DCFUGRO1200.0[m]DCFUGRO1220.0[m]DCFUGRO1240.0[m]DCFUGRO1260.0[m]DCFUGRO1280.0[m]DCFUGRO1300.0[m]DCFUGRO1320.0[m]DCFUGRO1340.0[m]DCFUGRO1360.0[m]DCFUGRO1380.0[m]DCFUGRO1400.0[m]DCFUGRO1420.0[m]DCFUGRO1440.0[m]DCFUGRO1460.0[m]DCFUGRO1480.0[m]DCFUGRO1500.0[m]DCFUGRO1520.0[m]DCFUGRO1540.0[m]DCFUGRO1560.0[m]DCFUGRO1580.0[m]DCFUGRO1600.0[m]DCFUGRO1620.0[m]DCFUGRO1640.0[m]DCFUGRO1660.0[m]DCFUGRO1670.0[m]DCFUGRO1676.0[m]DCFUGRO1680.0[m]DCFUGRO1686.0[m]DCFUGRO1692.0[m]DCFUGRO1695.0[m]DCFUGRO1704.0[m]DCFUGRO1713.0[m]DCFUGRO1722.0[m]DCFUGRO1800.0[m]DCFUGRO1806.0[m]DCFUGRO1815.0[m]DCFUGRO1821.0[m]DCFUGRO1830.0[m]DCFUGRO1836.0[m]DCFUGRO1842.0[m]DCFUGRO1848.0[m]DCFUGRO1854.0[m]DCFUGRO1860.0[m]DCFUGRO1866.0[m]DCFUGRO1869.0[m]DCFUGRO1875.0[m]DCFUGRO1881.0[m]DCFUGRO1887.0[m]DCFUGRO1890.0[m]DCFUGRO1893.0[m]CFUGRO1895.8[m]CFUGRO1897.0[m]CFUGRO1899.7[m]CFUGRO1928.9[m]CFUGRO1929.0[m]CFUGRO1929.9[m]CFUGRO1939.6[m]CFUGRO