7121/5-2
Export:
PDF
![PDF icon](https://factpages.sodir.no/Images/file-pdf.png)
-
General information
-
Wellbore history
GeneralWell 7121/5-2 is located ca 10 km northeast of the Snøhvit Field. The purpose of the well was to test the hydrocarbon accumulation on the Beta-structure in sandstones of the Early to Middle Jurassic Stø-formation.Operations and resultsThe well was spudded with the semi-submersible installation Ross Isle on 26 May 1986 and drilled to TD at 2543 m in Late Triassic sediments (Rhaetian age). The well was drilled with seawater and hi-vis pills down to 850 m, with gypsum/polymer mud from 850 m to 1977 m, and with gypsum/polymer/NaCl mud from 1977 m to TD.Hydrocarbon bearing Middle Jurassic sandstones in the Stø Formation were encountered at 2323 m. The gas-bearing zone extends from 2323 m to 2346 m. The gas zone is sealed from the underlying oil zone by a 6 m thick dense shale layer, which prevents the exact location of a gas/oil contact. The oil-bearing zone extends from 2352 m 2358.5 m. The oil water contact at 2358.5 m was picked both from logs and core data. Three cores were cut in the Stø formation (2324 m to 2400 m). A total of 9 FMT runs were performed; two to obtain pressure points and 7 to obtain segregated samples. The first run resulted in 32 pre test pressure points out of 38 attempts, in the interval 2323.5 m to 2369.0 m. Eighteen points were taken in the gas zone, 6 in the tight zone, 4 in the oil zone and 4 were in the water zone. The second run resulted in 9 pre test pressure points of nine attempts in the interval 2358 m to 2361 m. Seven attempts to obtain segregated samples resulted in 5 good samples, two at 2355 m, one at 2326 m, and two at 2353.5 m.The well was permanently abandoned on 6 June 1986 as an oil and gas discovery.TestingDue to the presence of hydrogen sulphide in the well, no tests were 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]460.002539.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12324.02342.8[m ]22343.02371.0[m ]32371.02399.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]74.8Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
-
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 typeCONDUCTOR30449.036452.00.00LOTSURF.COND.20829.0261035.01.53LOTINTERM.13 3/81898.417 1/21977.01.48LOTOPEN HOLE2543.012 1/42543.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BHC AC CDL VDL GR3441898CDL CNL GR18972544CDL GR8291939COREGUN19272540DIFL BHC AC CDL GR SP CAL8291958DIFL BHC AC GR SP CAL18972644DLL MLL GR22932544FMT23232369FMT23282355HR DIP18972540MWD - GR RES4991035RLL - GR RES23002550 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit350449449934934977977182020792260230523232323240024502503 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.33 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf2.43 -
Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf21.23 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3901.08WATER BASED26.05.19864531.08WATER BASED26.05.19864530.00800.011.0WATERBASED05.06.19865241.10600.012.7WATER BASED05.06.19868481.10600.014.8WATER BASED05.06.198610351.10600.013.5WATER BASED05.06.198610350.00800.029.4WATERBASED05.06.198610351.081000.028.3WATER BASED05.06.198610351.102400.07.2WATER BASED08.06.198610351.08900.028.8WATER BASED05.06.198611691.102400.08.0WATER BASED08.06.198614151.132300.09.3WATER BASED09.06.198615801.142200.010.1WATER BASED11.06.198617541.152000.09.7WATER BASED12.06.198618741.162200.09.3WATER BASED15.06.198619770.002100.08.0WATERBASED15.06.198619771.302600.08.4WATER BASED15.06.198619771.162000.09.3WATERBASED15.06.198620601.302200.07.2WATERBASED17.06.198621351.281900.07.2WATERBASED18.06.198622171.261900.06.3WATER BASED19.06.198622931.251900.05.1WATERBASED23.06.198623241.282000.05.5WATERBASED23.06.198623631.271900.05.9WATER BASED23.06.198623991.271800.05.9WATER BASED23.06.198624311.271900.06.3WATER BASED24.06.198624701.262000.06.3WATER BASED25.06.198624841.262100.06.5WATER BASED30.06.198625071.262100.06.5WATER BASED26.06.198625071.262100.06.5WATER BASED30.06.198625431.262400.07.6WATERBASED30.06.198625431.262400.07.8WATER BASED30.06.198625431.262200.07.8WATER BASED30.06.1986 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1504.0[m]DCGEARHA1516.0[m]DCGEARHA1534.0[m]DCGEARHA1540.0[m]DCGEARHA1552.0[m]DCGEARHA1564.0[m]DCGEARHA1576.0[m]DCGEARHA1588.0[m]DCGEARHA1600.0[m]DCGEARHA1612.0[m]DCGEARHA1624.0[m]DCGEARHA1636.0[m]DCGEARHA1648.0[m]DCGEARHA1660.0[m]DCGEARHA1672.0[m]DCGEARHA1684.0[m]DCGEARHA1696.0[m]DCGEARHA1708.0[m]DCGEARHA1720.0[m]DCGEARHA1735.0[m]DCGEARHA1744.0[m]DCGEARHA1756.0[m]DCGEARHA1768.0[m]DCGEARHA1780.0[m]DCGEARHA1792.0[m]DCGEARHA1804.0[m]DCGEARHA1816.0[m]DCGEARHA1828.0[m]DCGEARHA1840.0[m]DCGEARHA1852.0[m]DCGEARHA1864.0[m]DCGEARHA1876.0[m]DCGEARHA1888.0[m]DCGEARHA1900.0[m]DCGEARHA1912.0[m]DCGEARHA1924.0[m]DCGEARHA1927.5[m]SWCGEARHA1936.0[m]DCGEARHA1951.0[m]DCGEARHA1963.0[m]DCGEARHA1972.0[m]DCGEARHA1982.0[m]SWCSTATOIL1984.0[m]DCGEARHA1996.0[m]DCGEARHA2008.0[m]DCGEARHA2020.0[m]DCGEARHA2032.0[m]DCGEARHA2044.0[m]DCGEARHA2054.0[m]SWCSTATOIL2056.0[m]DCGEARHA2062.0[m]SWCGEARHA2062.0[m]SWCSTATOIL2068.0[m]DCGEARHA2080.0[m]DCGEARHA2080.0[m]SWCSTATOIL2092.0[m]DCGEARHA2104.0[m]DCGEARHA2116.0[m]DCGEARHA2121.0[m]SWCSTATOIL2128.0[m]DCGEARHA2140.0[m]DCGEARHA2152.0[m]DCGEARHA2164.0[m]DCGEARHA2168.0[m]SWCGEARHA2168.0[m]SWCSTATOIL2175.0[m]SWCGEARHA2176.0[m]DCGEARHA2178.0[m]SWCGEARHA2178.0[m]DCSTATOIL2184.0[m]SWCGEARHA2187.0[m]SWCGEARHA2187.0[m]SWCSTATOIL2188.0[m]DCGEARHA2195.0[m]SWCGEARHA2200.0[m]DCGEARHA2207.0[m]SWCGEARHA2207.0[m]SWCSTATOIL2212.0[m]DCGEARHA2220.5[m]SWCSTATOIL2224.0[m]DCGEARHA2236.0[m]DCGEARHA2248.0[m]DCGEARHA2249.0[m]SWCGEARHA2260.0[m]DCGEARHA2264.5[m]SWCGEARHA2272.0[m]DCGEARHA2284.0[m]DCGEARHA2286.0[m]SWCGEARHA2296.0[m]DCGEARHA2303.0[m]SWCGEARHA2308.0[m]DCGEARHA2312.5[m]SWCGEARHA2320.0[m]DCGEARHA2321.0[m]SWCGEARHA2324.5[m]CGEARHA2328.6[m]CGEARHA2332.0[m]DCGEARHA2339.9[m]CGEARHA2344.0[m]DCGEARHA2344.0[m]DCGEARHA2344.8[m]CGEARHA2350.4[m]CGEARHA2356.0[m]DCGEARHA2363.0[m]CGEARHA2368.0[m]DCGEARHA2375.1[m]CGEARHA2380.0[m]DCGEARHA2382.7[m]CGEARHA2397.0[m]CGEARHA2398.7[m]CGEARHA2404.0[m]DCGEARHA2416.0[m]DCGEARHA2425.0[m]DCGEARHA2432.0[m]SWCGEARHA2440.0[m]DCGEARHA2446.0[m]DCGEARHA2449.0[m]SWCGEARHA2452.0[m]DCGEARHA2460.0[m]SWCGEARHA2461.0[m]DCGEARHA2475.0[m]DCGEARHA2480.0[m]DCGEARHA2488.0[m]DCGEARHA2500.0[m]DCGEARHA2503.5[m]SWCGEARHA2512.0[m]DCGEARHA2519.0[m]SWCGEARHA2524.0[m]DCGEARHA2528.0[m]DCGEARHA2534.0[m]SWCGEARHA2539.0[m]DCGEARHA