35/11-23
Export:
PDF
![PDF icon](https://factpages.sodir.no/Images/file-pdf.png)
-
General information
-
Wellbore history
GeneralWell 35/11-23 was drilled to test the Echino Sør prospect on the Lomre Terrace north of the Troll Field in the North Sea. The primary objective was to prove petroleum in the Late Jurassic Sognefjord Formation. The secondary objective was to prove petroleum in the Middle Jurassic Brent Group and to investigate the presence of reservoirs and reservoir quality in the Middle Jurassic Etive and Oseberg Formations.Operations and resultsWildcat well 35/11-23 was spudded with the semi-submersible installation Deepsea Atlantic on 6 October 2019 and drilled to TD at 2977 m in the Early Jurassic Cook Formation. While drilling 17 ½” section, a gas peak of 4% was observed at 455m MD. Flow check showed a stable well. However, a shallow water flow was observed after cementing the 13 3/8” casing. This was observed on the Wellhead with ROV, declining to no flow after 24 hrs. Otherwise operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 432 m, with Aqua-drill mud from 432 to 1297 m, and with Synteq oil-based mud from 1297 m to TD.Two Sognefjord Formation sands were penetrated, a J56 sand from 2292 to 2321 m, and a J52 sand from 2385 to 2406 m. The J56 sand contained gas and oil with a GOC at 2312 m and an oil-leg down-to the base of the sand. The J52 sand contained oil with an OWC in-well at ca 2397 m. A 16 m thick Krossfjord Formation Equivalent with top at 2541 m had indications of hydrocarbons.In the Brent Group, the Ness Formation consists of interbedded coal beds and claystone with thin sands. Ness had hydrocarbon indications from 2725 to 2743 m in four sandstone bodies based on elevated gas and resistivity readings, and a gas sample was taken in the uppermost sand. The Etive Formation with top at 2759 m proved to contain gas and oil with a GOC at 2772 m and oil with an OWC at 2792 m. The Oseberg Formation and sand beds in the Dunlin Group proved to be water bearing.Three consecutive cores were cut from 2301.5 to 2463.8 m in the Sognefjord and underlying Heather formation with 100% total recovery. The core-log shifts are -4.2 m for core 1 and -3.55 m for cores 2 and 3. RCX fluid samples were taken at 2293 m (gas), 2312.9 m (oil), 2320.5 m (oil), 2385.3 m (oil), 2403.5 m (water), 2724.5 m (gas), 2766.4 m (gas), 2771.1 m (oil/gas), 2774.6 m (oil), 2803.5 m (water), and 2840 m (water) .The wellbore was permanently abandoned on 4 November as an oil and 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]440.002977.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12301.52355.5[m ]22355.52410.0[m ]32410.82465.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]163.2Cores 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 typeCONDUCTOR36429.542432.00.00SURF.COND.13 3/81287.917 1/21297.01.47FITLINER9 5/82140.012 1/42141.01.42FITOPEN HOLE2976.88 1/22976.80.00 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DSL FLEX MREX FTEX21322985DSL XMAC 3DEX HDI20502987GR GXPL UXPL21322985LWD - ECD DIR380432LWD - GR RES ECD DIR4321297LWD - GR RES ECD DIR21412302LWD - GR RES ECD DIR23022977LWD - GR RES ECD DIR DEN NEU SON12972141MAXCOR25372840MRCH JAR TTRM DSL CN ZDL21322987RCX SENTINEL22932774RCX SENTINEL23032803RCX SENTINEL23202840ULTEX CBL3611240VSP3482898 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit380811835158116091653175817911980198020592168223422922321238524062541255727222722275928162835289428942911 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory440.0[m]DCPETROSTR470.0[m]DCPETROS500.0[m]DCPETROS530.0[m]DCPETROS560.0[m]DCPETROS590.0[m]DCPETROS620.0[m]DCPETROS650.0[m]DCPETROS680.0[m]DCPETROS710.0[m]DCPETROS740.0[m]DCPETROS770.0[m]DCPETROS800.0[m]DCPETROS830.0[m]DCPETROS840.0[m]DCPETROS860.0[m]DCPETROS890.0[m]DCPETROS920.0[m]DCPETROS950.0[m]DCPETROS980.0[m]DCPETROS1010.0[m]DCPETROS1050.0[m]DCPETROS1080.0[m]DCPETROS1090.0[m]DCPETROS1120.0[m]DCPETROS1150.0[m]DCPETROS1180.0[m]DCPETROS1210.0[m]DCPETROS1240.0[m]DCPETROS1270.0[m]DCPETROS1290.0[m]DCPETROS1300.0[m]DCPETROS1330.0[m]DCPETROS1360.0[m]DCPETROS1370.0[m]DCPETROS1400.0[m]DCPETROS1430.0[m]DCPETROS1460.0[m]DCPETROS1490.0[m]DCPETROS1520.0[m]DCPETROS1550.0[m]DCPETROS1570.0[m]DCPETROS1580.0[m]DCPETROS1590.0[m]DCPETROS1610.0[m]DCPETROS1625.0[m]DCPETROS1640.0[m]DCPETROS1655.0[m]DCPETROS1670.0[m]DCPETROS1685.0[m]DCPETROS1700.0[m]DCPETROS1715.0[m]DCPETROS1730.0[m]DCPETROS1745.0[m]DCPETROS1760.0[m]DCPETROS1775.0[m]DCPETROS1790.0[m]DCPETROS1800.0[m]DCPETROS1815.0[m]DCPETROS1830.0[m]DCPETROS1845.0[m]DCPETROS1855.0[m]DCPETROS1860.0[m]DCPETROS1875.0[m]DCPETROS1890.0[m]DCPETROS1905.0[m]DCPETROS1920.0[m]DCPETROS1940.0[m]DCPETROS1970.0[m]DCPETROS1980.0[m]DCPETROS1990.0[m]DCPETROS2010.0[m]DCPETROS2030.0[m]DCPETROS2050.0[m]DCPETROS2070.0[m]DCPETROS2090.0[m]DCPETROS2110.0[m]DCPETROS2130.0[m]DCPETROS2146.0[m]DCPETROS2158.0[m]DCPETROS2167.0[m]DCPETROS2173.0[m]DCPETROS2185.0[m]DCPETROS2197.0[m]DCPETROS2209.0[m]DCPETROS2221.0[m]DCPETROS2233.0[m]DCPETROS2239.0[m]DCPETROS2245.0[m]DCPETROS2254.0[m]DCPETROS2263.0[m]DCPETROS2272.0[m]DCPETROS2281.0[m]DCPETROS2290.0[m]DCPETROS2293.0[m]DCPETROS2299.0[m]DCPETROS2302.8[m]CPETROS2304.1[m]CPETROS2306.4[m]CPETROS2310.8[m]CPETROS2312.1[m]CPETROS2313.0[m]CPETROS2316.8[m]CPETROS2317.7[m]CPETROS2319.2[m]CPETROS2321.8[m]CPETROS2323.8[m]CPETROS2325.8[m]CPETROS2328.1[m]CPETROS2331.7[m]CPETROS2334.4[m]CPETROS2337.5[m]CPETROS2340.6[m]CPETROS2343.4[m]CPETROS2346.4[m]CPETROS2349.8[m]CPETROS2352.3[m]CPETROS2355.6[m]CPETROS2358.7[m]CPETROS2361.7[m]CPETROS2364.6[m]CPETROS2367.4[m]CPETROS2370.1[m]CPETROS2373.8[m]CPETROS2376.6[m]CPETROS2379.2[m]CPETROS2382.9[m]CPETROS2384.2[m]CPETROS2387.9[m]CPETROS2388.7[m]CPETROS2393.8[m]CPETROS2397.4[m]CPETROS2401.2[m]CPETROS2404.8[m]CPETROS2406.7[m]CPETROS2408.5[m]CPETROS2411.2[m]CPETROS2414.9[m]CPETROS2418.7[m]CPETROS2422.6[m]CPETROS2426.9[m]CPETROS2430.9[m]CPETROS2434.4[m]CPETROS2438.7[m]CPETROS2443.7[m]CPETROS2446.9[m]CPETROS2449.7[m]CPETROS2452.9[m]CPETROS2455.8[m]CPETROS2458.7[m]CPETROS2461.6[m]CPETROS2464.5[m]CPETROS2467.0[m]DCPETROS2476.0[m]DCPETROS2485.0[m]DCPETROS2494.0[m]DCPETROS2503.0[m]DCPETROS2512.0[m]DCPETROS2521.0[m]DCPETROS2530.0[m]DCPETROS2539.0[m]DCPETROS2548.0[m]DCPETROS2566.0[m]DCPETROS2575.0[m]DCPETROS2584.0[m]DCPETROS2593.0[m]DCPETROS2602.0[m]DCPETROS2611.0[m]DCPETROS2620.0[m]DCPETROS2629.0[m]DCPETROS2638.0[m]DCPETROS2647.0[m]DCPETROS2656.0[m]DCPETROS2665.0[m]DCPETROS2674.0[m]DCPETROS2683.0[m]DCPETROS2692.0[m]DCPETROS2701.0[m]DCPETROS2707.0[m]DCPETROS2713.0[m]DCPETROS2719.0[m]DCPETROS2722.0[m]DCPETROS2728.0[m]DCPETROS2734.0[m]DCPETROS2740.0[m]DCPETROS2746.0[m]DCPETROS2752.0[m]DCPETROS2758.0[m]DCPETROS2764.0[m]DCPETROS2770.0[m]DCPETROS2776.0[m]DCPETROS2782.0[m]DCPETROS2788.0[m]DCPETROS2794.0[m]DCPETROS2800.0[m]DCPETROS2806.0[m]DCPETROS2812.0[m]DCPETROS2818.0[m]DCPETROS2824.0[m]DCPETROS2830.0[m]DCPETROS2836.0[m]DCPETROS2842.0[m]DCPETROS2848.0[m]DCPETROS2854.0[m]DCPETROS2860.0[m]DCPETROS2866.0[m]DCPETROS2872.0[m]DCPETROS2878.0[m]DCPETROS2884.0[m]DCPETROS2890.0[m]DCPETROS2896.0[m]DCPETROS2902.0[m]DCPETROS2905.0[m]DCPETROS2908.0[m]DCPETROS2914.0[m]DCPETROS2920.0[m]DCPETROS2926.0[m]DCPETROS2932.0[m]DCPETROS2938.0[m]DCPETROS2944.0[m]DCPETROS2950.0[m]DCPETROS2956.0[m]DCPETROS2962.0[m]DCPETROS2968.0[m]DCPETROS2974.0[m]DCPETROS