7121/8-1
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General information
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Wellbore history
GeneralWell 7121/8-1 was drilled to test the Blåmann prospect in the Hammerfest Basin of the Barents Sea. The primary objective was to test the hydrocarbon potential of the Jurassic Stø Formation, secondary to test the hydrocarbon potential of the Fruholmen/Snadd formations.Operations and resultsWildcat well 7121/8-1 was spudded with the semi-submersible installation Songa Enabler on 22 May 2017 and drilled to TD at 2260 m in the Late Triassic Snadd Formation. Well was temporarily abandoned on 3 June 2017 after finishing the 12 1/4" section at 1781 m in the Knurr Formation. This was due to the legal dispute over the Cap-X technology. Partnership decided that the most efficient use of resources was to temporarily P&A the well and move to 7219/9-2 Kayak. After finishing Kayak the rig returned to Blåmann on 2 July and continued operations. Otherwise, operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 895 m and with Enviromul oil-based mud from 895 m to TD.Primary target Stø Formation was encountered at 1911 m. It was gas-bearing with the gas-water contact at 1934 m. The secondary targets proved to be dry. Shows on drilled cuttings are reported from 1928 m to 1984 m in the cored interval, and are described as spotted, dull fluorescence. Shows were also described in the interval from 2003 m to 2123 m, in the Nordmela, Tubåen and Fruholmen Formations, as spotty, dull, direct fluorescence with a slow, cloudy cut fluorescence. The shows descriptions are poor due to the masking effect by the oil-based mud.One core was cut from 1918 to 1984 m with 100% recovery in the Stø and Nordmela formations. The core-log depth shift is -1.4 m. MDT fluid samples were taken at 1911.4 m (gas) and 1936.6 m (water).The well was permanently abandoned on 15 July 2017 as a gas discovery.TestingNo drill stem test was performed. -
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]980.002260.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11918.01983.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]65.7Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 typeINTERM.13 5/8970.017 1/2980.01.48LOTLINER9 5/81778.012 1/21781.01.46LOTOPEN HOLE2260.08 1/22260.00.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MDT GR19112216MWD - GR RES DEN NEU SON DI9771781MWD - GR RES PWD DI17812260MWD - GR RES SON DI408977XLR GR18162223ZAIT MSIP PEX ECS17162260 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit40840843143181181187387315841766182219091911191119392025203920802211 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4071.2531.0Enviromul9661.1123.0Enviromul11501.1424.0Enviromul16581.2529.0Enviromul17051.2225.0Enviromul17111.1420.0Enviromul17811.2527.0Enviromul17811.1420.0Enviromul17901.2528.0Enviromul22591.2528.0Enviromul -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory990.0[m]DCCGG1020.0[m]DCCGG1040.0[m]DCCGG1080.0[m]DCCGG1100.0[m]DCCGG1120.0[m]DCCGG1140.0[m]DCCGG1160.0[m]DCCGG1180.0[m]DCCGG1200.0[m]DCCGG1260.0[m]DCCGG1280.0[m]DCCGG1300.0[m]DCCGG1320.0[m]DCCGG1340.0[m]DCCGG1360.0[m]DCCGG1380.0[m]DCCGG1400.0[m]DCCGG1420.0[m]DCCGG1440.0[m]DCCGG1460.0[m]DCCGG1480.0[m]DCCGG1500.0[m]DCCGG1540.0[m]DCCGG1560.0[m]DCCGG1580.0[m]DCCGG1600.0[m]DCCGG1620.0[m]DCCGG1640.0[m]DCCGG1660.0[m]DCCGG1680.0[m]DCCGG1700.0[m]DCCGG1720.0[m]DCCGG1740.0[m]DCCGG1760.0[m]DCCGG1781.0[m]DCCGG1793.0[m]DCCGG1824.4[m]SWCCGG1829.0[m]DCCGG1835.0[m]DCCGG1839.2[m]SWCCGG1841.0[m]DCCGG1847.0[m]DCCGG1853.0[m]DCCGG1859.0[m]DCCGG1865.0[m]DCCGG1871.0[m]DCCGG1877.0[m]DCCGG1883.0[m]DCCGG1889.0[m]DCCGG1890.8[m]SWCCGG1895.0[m]DCCGG1901.0[m]DCCGG1907.0[m]DCCGG1908.0[m]SWCCGG1908.6[m]SWCCGG1913.0[m]DCCGG1918.9[m]CCGG1923.8[m]CCGG1929.8[m]CCGG1933.4[m]CCGG1939.7[m]CCGG1939.9[m]CCGG1940.8[m]CCGG1944.8[m]CCGG1949.6[m]CCGG1953.4[m]CCGG1960.3[m]CCGG1966.7[m]CCGG1968.1[m]CCGG1975.8[m]CCGG1977.4[m]CCGG1983.5[m]CCGG1991.0[m]DCCGG1997.0[m]DCCGG2003.0[m]DCCGG2005.6[m]SWCCGG2009.0[m]DCCGG2015.0[m]DCCGG2021.0[m]DCCGG2027.0[m]DCCGG2032.0[m]SWCCGG2033.0[m]DCCGG2039.0[m]DCCGG2042.3[m]SWCCGG2045.0[m]DCCGG2051.0[m]DCCGG2057.0[m]DCCGG2063.0[m]DCCGG2069.0[m]DCCGG2075.0[m]DCCGG2081.0[m]DCCGG2087.0[m]DCCGG2093.0[m]DCCGG2096.5[m]SWCCGG2099.0[m]DCCGG2105.0[m]DCCGG2111.0[m]DCCGG2117.0[m]DCCGG2123.0[m]DCCGG2129.0[m]DCCGG2135.0[m]DCCGG2141.0[m]DCCGG2147.0[m]DCCGG2153.0[m]DCCGG2159.0[m]DCCGG2165.0[m]DCCGG2171.0[m]DCCGG2177.0[m]DCCGG2183.0[m]DCCGG2189.0[m]DCCGG2195.0[m]DCCGG2201.0[m]DCCGG2207.0[m]DCCGG2213.0[m]DCCGG2219.0[m]DCCGG2223.3[m]SWCCGG2225.0[m]DCCGG2231.0[m]DCCGG2237.0[m]DCCGG2243.0[m]DCCGG2249.0[m]DCCGG2255.0[m]DCCGG2260.0[m]DCCGG