7/1-2 S
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General information
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Wellbore history
GeneralThe 7/1-2 S Yoda well is located on the north-western margin of the Jæren High, 18 km southeast of the Varg field and 5.5 km northeast of the closest well 6/3-2. The well is located on a 4-way dip closure over a salt wall similar to the Rev discovery 13 km northwest of Yoda. The primary objective of the well was to prove commercial hydrocarbons in the Late Jurassic Ula Formation sandstones. The secondary objective was to test the Triassic prospectivity.Operations and resultsWell was spudded with the jack-up installation Mærsk Giant on 20 March 2008 and drilled to TD at 3175 m in the Middle Jurassic Bryne Formation. It was drilled slightly deviated in an S-shaped track, vertical down to ca 1600 m and below ca 2400 m with maximum deviation of 16 deg from vertical at 1893 m. Whilst drilling the 17 1/2" section from 592 to 1320 m the hole produced significant amounts of large, blocky cavings, but there were no real problems encountered during operations. The well was drilled with seawater down to 201 m, with Aquadril glycol/KCl mud from 201 to 1320 m, and with Carbo-Sea oil based mud from 1320 m to TD.The Mandal Formation was encountered at 2848 m and was 71 m thick with very high gamma ray responses varying between 150 and 300 API. The top of the reservoir, Ula Formation, was encountered at 2945 m, 16 m shallower than prognosed, and 14 m thicker than prognosed. No shows were observed in cuttings and gas and the resistivity remained low throughout the Ula Formation indicating a water wet reservoir. The rock below the Ula Formation reservoir was prognosed to be the Triassic Skagerrak Formation. However, it turned out to be the Middle Jurassic Bryne Formation. As a result the well was TD?ed in the Bryne Formation and not as planned in the Skagerrak Formation. This was first discovered after receiving the post well biostratigraphy results.No cores were cut and no wire line pressure or fluid samples were taken.The well was permanently abandoned on 8 May 2008 as a dry well.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]210.003175.00 -
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 typeCONDUCTOR30198.036201.00.00LOTSURF.COND.20583.026592.01.85LOTINTERM.13 3/81313.017 1/21320.01.80LOTINTERM.9 5/82931.012 1/42937.02.12LOTOPEN HOLE3175.08 1/23175.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]HDIL XMAC DSL GR24003172MWD - DIR130201MWD - DIR GR RES PWD2013173ZDL CN GR28703172ZDL CN GR28703172 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit13012802212221222402333244424622462248026742806280628282840284828482919294529453122 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2051.03Water Based2061.3013.0Water Based2241.3013.0Water Based4401.0910.0Water Based5921.2520.0Water Based10381.3919.0Water Based13201.3918.0Water Based -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory610.0[m]DCAPT810.0[m]DCAPT910.0[m]DCAPT1020.0[m]DCAPT1110.0[m]DCAPT1160.0[m]DCAPT1180.0[m]DCAPT1200.0[m]DCAPT1220.0[m]DCAPT1240.0[m]DCAPT1260.0[m]DCAPT1280.0[m]DCAPT1300.0[m]DCAPT1320.0[m]DCAPT1340.0[m]DCAPT1360.0[m]DCAPT1380.0[m]DCAPT1400.0[m]DCAPT1420.0[m]DCAPT1440.0[m]DCAPT1460.0[m]DCAPT1480.0[m]DCAPT1500.0[m]DCAPT1520.0[m]DCAPT1540.0[m]DCAPT1560.0[m]DCAPT1580.0[m]DCAPT1600.0[m]DCAPT1620.0[m]DCAPT1640.0[m]DCAPT1660.0[m]DCAPT1680.0[m]DCAPT1700.0[m]DCAPT1720.0[m]DCAPT1740.0[m]DCAPT1760.0[m]DCAPT1780.0[m]DCAPT1820.0[m]DCAPT1840.0[m]DCAPT1860.0[m]DCAPT1880.0[m]DCAPT1900.0[m]DCAPT1920.0[m]DCAPT1940.0[m]DCAPT1960.0[m]DCAPT1980.0[m]DCAPT2000.0[m]DCAPT2020.0[m]DCAPT2040.0[m]DCAPT2060.0[m]DCAPT2080.0[m]DCAPT2100.0[m]DCAPT2120.0[m]DCAPT2140.0[m]DCAPT2160.0[m]DCAPT2180.0[m]DCAPT2200.0[m]DCAPT2220.0[m]DCAPT2240.0[m]DCAPT2260.0[m]DCAPT2280.0[m]DCAPT2300.0[m]DCAPT2320.0[m]DCAPT2340.0[m]DCAPT2360.0[m]DCAPT2380.0[m]DCAPT2420.0[m]DCAPT2440.0[m]DCAPT2460.0[m]DCAPT2840.0[m]DCAPT2850.0[m]DCAPT2860.0[m]DCAPT2870.0[m]DCAPT2880.0[m]DCAPT2890.0[m]DCAPT2900.0[m]DCAPT2910.0[m]DCAPT2920.0[m]DCAPT2930.0[m]DCAPT2937.0[m]DCAPT2949.0[m]DCAPT2955.0[m]DCAPT3126.0[m]DCAPT3132.0[m]DCAPT3138.0[m]DCAPT3144.0[m]DCAPT3150.0[m]DCAPT3156.0[m]DCAPT3162.0[m]DCAPT3168.0[m]DCAPT3175.0[m]DCAPT