16/7-5
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General information
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Wellbore history
Well 16/7-5 is located ca 10 km east of the Sleipner Øst field in the North Sea. The primary objective was to test potential gas bearing Jurassic/Triassic sandstones.Operations and resultsWildcat well 16/7-5 was spudded with the semi-submersible installation Zapata Ugland on 2 July 1984 and drilled to TD at 2900 m in the Triassic Smith Bank Formation. Due to turning of the permanent guide base the 30" casing had to be re-landed. No other major problems occurred during drilling. The well was drilled with gel/sea water down to 170 m, and with seawater/lignosulphonate gel from 470 m to TD.The ?Jurassic/Triassic (Skagerrak Formation) was encountered at 2594, underlying an interpreted one-meter layer of Draupne shale. A 306 m gross / 120.5 m net (22% average porosity) sequence of sands was penetrated. No significant hydrocarbon shows were encountered while drilling the well. Electric log analysis also confirmed that the Jurassic/Triassic Sandstone (primary objective) was water bearing. RFT pressure measurements and samples suggested the possible presence of minor amount of gas in the upper part (2594 m to 2642.6 m) where the pressure gradient was lower than the water gradient (below 2662.5 m). However, the pressure readings were scattered in this interval and very much subject to interpretation.One core was cut from 2590 to 2603 m (2596 - 2612.5 m logger's depth) in the top of the target sands in the Skagerrak Formation. Three successful RFT fluid samples were taken. The first sample, at 2691 m, recovered "2800 cc. of light brown fluid, mainly mud filtrate and mud, no gas, no fluorescence". The second, at 2806.5 m, recovered "8600 cc. of clear medium brown fluid, mainly mud filtrate with a few cc's of gas. The fluid had no odour or taste but it had a very pale bluish white fluorescence". The third, at 2603 m, recovered "8700 cc. of none clear (turbid) fluid + few cc's of gas. The fluid had no odour or taste, but a pale bluish white fluorescence".The well was permanently abandoned on 3 August 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]170.002897.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12590.02603.1[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]13.1Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30168.036170.00.00LOTSURF.COND.20458.726474.01.91LOTINTERM.13 3/81264.017 1/21313.01.78LOTINTERM.9 5/82335.012 1/42368.02.00LOTOPEN HOLE2900.08 1/22900.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR3341264CST13662337ISF BHC GR CAL4591280ISF SLS GR CAL106470ISF SLS GR CAL23352903ISF SLS GR SP CAL12642350LDT CNL GR CAL23352903LDT CNT GR CAL12642350RFT23752897RFT25832888RFT26032636SHDT16002350SHDT23352903VSP3002900 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1078681015110511702075207521412216229323102310232824672536256825682575258325932593259425942775 -
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]pdf16.76pdf25.17pdf35.39pdf4.41pdf11.92pdf0.47 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured4201.065.04.8WATER BASED02.07.19844741.086.05.3WATER BASED02.07.19844741.157.07.0WATER BASED03.07.19844741.158.07.2WATER BASED05.07.19844741.157.07.2WATER BASED05.07.19844741.158.08.6WATER BASED10.07.19844741.157.07.0WATER BASED03.07.19844741.157.07.2WATER BASED05.07.19844741.158.08.6WATER BASED10.07.19844741.086.05.3WATER BASED02.07.19844741.158.07.2WATER BASED05.07.19845681.076.08.6WATER BASED10.07.19849001.157.07.5WATER BASED10.07.198412001.148.010.5WATER BASED10.07.198412801.158.09.5WATER BASED12.07.198412801.1513.014.4WATER BASED10.07.198412801.1513.014.4WATER BASED10.07.198412801.158.09.5WATER BASED12.07.198413021.159.010.1WATER BASED12.07.198415791.108.08.1WATER BASED17.07.198419861.1411.07.7WATER BASED17.07.198423101.1612.010.5WATER BASED17.07.198423501.2710.011.0WATER BASED20.07.198423501.2112.09.5WATER BASED17.07.198423501.2112.09.5WATER BASED19.07.198423501.2710.011.0WATER BASED20.07.198423501.2714.013.4WATER BASED20.07.198423501.2416.09.5WATER BASED23.07.198423501.2112.09.5WATER BASED17.07.198423501.2112.09.5WATER BASED19.07.198423501.2714.013.4WATER BASED20.07.198423501.2416.09.5WATER BASED23.07.198425101.2517.08.1WATER BASED25.07.198425801.3018.08.6WATER BASED25.07.198425901.3322.09.6WATER BASED25.07.198426441.3321.09.6WATER BASED31.07.198428861.3319.08.1WATER BASED31.07.198429001.3318.08.1WATER BASED31.07.1984 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory470.0[m]DC500.0[m]DC530.0[m]DC560.0[m]DC590.0[m]DC620.0[m]DC650.0[m]DC680.0[m]DC710.0[m]DC740.0[m]DC770.0[m]DC800.0[m]DC830.0[m]DC860.0[m]DC890.0[m]DC920.0[m]DC940.0[m]DC950.0[m]DC970.0[m]DC980.0[m]DC1010.0[m]DC1040.0[m]DC1070.0[m]DC1100.0[m]DC1100.0[m]DC1130.0[m]DC1140.0[m]DC1160.0[m]DC1190.0[m]DC1220.0[m]DC1250.0[m]DC1280.0[m]DC1310.0[m]DC1340.0[m]DC1370.0[m]DC1400.0[m]DC1430.0[m]DC1460.0[m]DC1490.0[m]DC1520.0[m]DC1550.0[m]DC1580.0[m]DC1610.0[m]DC1640.0[m]DC1670.0[m]DC1690.5[m]SWC1700.0[m]DC1712.5[m]SWC1730.0[m]DC1760.0[m]DC1790.0[m]DC1800.0[m]SWC1820.0[m]DC1840.0[m]DC1850.0[m]DC1870.0[m]DC1880.0[m]DC1910.0[m]DC1917.0[m]SWC1940.0[m]DC1970.0[m]DC2006.0[m]DC2036.0[m]SWC2048.0[m]SWC2051.5[m]SWC2066.0[m]DC2069.0[m]DC2078.0[m]DCGEOLAB2078.0[m]DC2087.0[m]DCGEOLAB2093.0[m]SWC2093.0[m]DCGEOLAB2096.0[m]DC2102.0[m]DCGEOLAB2111.0[m]DCGEOLAB2120.0[m]DCGEOLAB2126.0[m]DC2129.0[m]DCGEOLAB2138.0[m]DCGEOLAB2140.5[m]SWC2147.0[m]DCGEOLAB2152.5[m]SWC2156.0[m]DC2156.0[m]DCGEOLAB2160.5[m]SWC2165.0[m]DCGEOLAB2174.0[m]DCGEOLAB2177.0[m]DC2183.0[m]DCGEOLAB2184.5[m]SWC2186.0[m]DC2192.0[m]DCGEOLAB2201.0[m]DCGEOLAB2210.0[m]DCGEOLAB2216.0[m]DC2219.0[m]DCGEOLAB2228.0[m]DCGEOLAB2228.0[m]DC2237.0[m]DCGEOLAB2237.0[m]DC2246.0[m]DC2246.0[m]DCGEOLAB2252.5[m]SWC2255.0[m]DCGEOLAB2264.0[m]DCGEOLAB2273.0[m]DCGEOLAB2276.0[m]DC2282.0[m]DCGEOLAB2286.5[m]SWC2288.0[m]DC2291.0[m]DCGEOLAB2300.0[m]DCGEOLAB2302.0[m]SWC2306.0[m]DC2309.0[m]DCGEOLAB2318.0[m]DCGEOLAB2323.5[m]SWC2327.0[m]DCGEOLAB2336.0[m]DCGEOLAB2336.0[m]DC2348.0[m]DC2375.0[m]SWC2381.0[m]DC2411.0[m]DC2441.0[m]DC2471.0[m]DC2482.0[m]SWC2501.0[m]DC2528.0[m]DC2540.0[m]DC2551.5[m]SWC2552.0[m]DC2582.0[m]SWC2591.0[m]SWC2593.0[m]SWC2593.5[m]SWC2595.0[m]SWC2600.0[m]DC2612.0[m]DC2620.0[m]SWC2621.0[m]DC2623.0[m]SWC2637.0[m]SWC2654.0[m]SWC2660.0[m]SWC2687.5[m]SWC2703.5[m]SWC2708.0[m]SWC2711.0[m]DC2725.0[m]SWC2754.0[m]SWC2762.5[m]SWC2771.0[m]DC2787.0[m]SWC2825.0[m]SWC2831.0[m]DC2838.0[m]SWC2874.0[m]SWC