16/7-4
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General information
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Wellbore history
GeneralWell 16/7-4 is located ca 10 km southeast of the Sleipner Øst Field and 6 km east of the 15/9-15 gas discovery in the North Sea. The objective of the well was to test the presence of a structural trap in Jurassic/Triassic sandstones on the A-North Prospect in the southwest corner of Block 16/7.Operations and resultsWell 16/7-4 was spudded with the semi-submersible installation Glomar Biscay II on 15 October 1982 and drilled to TD at 2781 m in the Triassic Group. The well was drilled with seawater and gel all through.Only 1.5 m Jurassic sediments (Draupne Formation) were present in well position. The Triassic Group sandstone was encountered at 2521.5 m and held a 117.8 m gas/condensate column from top and down to 2639.3 m (-2314.3 m subsea). The gas-bearing sandstones were found interbedded with a few thin shales. The reservoir quality was best near the top of the sand, becoming gradually poorer downwards. The net gas sand was 85.4 m with 23% porosity and 36% average water saturation. No shows were reported from above or below the hydrocarbon-bearing interval in the well.Six conventional cores were cut from 2568 to 2681.5 m to in the Jurassic - Triassic interval. One Multi Formation Tester (MFT) fluid sample was taken at 2638.5 m. It recovered 1.2 litres of 57 deg API condensate, 1.3 Sm3 gas and 2 litres of water.The well was permanently abandoned on 6 December 1982 as a gas/condensate discovery.TestingTwo drill stem tests were performed in the Triassic Group.DST 1 at 2590.5 - 2597 m flowed 199 Sm3 condensate and 385110 Sm3 gas /day through a 42/64" choke. The gas/condensate ratio was 1938 Sm3/Sm3, the oil gravity was 58 deg API, and the gas gravity was 0.791 (air = 1).DST 2 at 2525 - 2535 m flowed 253 Sm3 condensate and 472890 Sm3 gas /day through a 42/64" choke. The gas/condensate ratio was 1871 Sm3/Sm3, the oil gravity was 59 deg API, and the gas gravity was 0.797 (air = 1).Water, other than condensation of water vapour, was not produced in the two tests. The CO2 content was between 0.3 and 0.4 %. H2S was not detected. -
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]170.002780.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12568.02573.4[m ]22591.02605.9[m ]32607.02624.6[m ]42625.02643.5[m ]52643.52662.5[m ]62662.52680.8[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]93.6Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory500.0[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]DC950.0[m]DC980.0[m]DC1010.0[m]DC1050.0[m]DC1080.0[m]DC1110.0[m]DC1140.0[m]DC1170.0[m]DC1200.0[m]DC1230.0[m]DC1260.0[m]DC1290.0[m]DC1320.0[m]DC1350.0[m]DC1380.0[m]DC1410.0[m]DC1440.0[m]DC1470.0[m]DC1500.0[m]DC1530.0[m]DC1560.0[m]DC1590.0[m]DC1620.0[m]DC1650.0[m]DC1680.0[m]DC1710.0[m]DC1740.0[m]DC1770.0[m]DC1800.0[m]DC1830.0[m]DC1860.0[m]DC1890.0[m]DC1920.0[m]DC1950.0[m]DC1980.0[m]DC2009.0[m]DC2040.0[m]DC2070.0[m]DC2100.0[m]DC2129.0[m]DC2159.0[m]DC2189.0[m]DC2219.0[m]DC2249.0[m]DC2279.0[m]DC2300.0[m]DC2309.0[m]DC2318.0[m]DC2327.0[m]DC2338.0[m]DC2339.0[m]DC2354.0[m]DC2361.5[m]SWC2369.0[m]DC2384.0[m]DC2399.0[m]DC2405.0[m]DC2410.0[m]SWC2414.0[m]DC2426.0[m]SWC2429.0[m]DC2438.0[m]DC2444.0[m]DC2453.0[m]DC2459.0[m]DC2465.0[m]DC2467.0[m]DC2474.0[m]DC2483.0[m]SWC2489.0[m]DC2490.0[m]SWC2495.5[m]SWC2501.0[m]DC2509.5[m]SWC2517.0[m]SWC2519.0[m]DC2520.5[m]SWC2522.5[m]SWC2525.0[m]DC2534.0[m]DC2535.0[m]SWC2536.5[m]SWC2538.0[m]SWC2540.0[m]SWC2540.0[m]DC2542.0[m]SWC2549.0[m]SWC2549.0[m]DC2553.5[m]SWC2555.0[m]SWC2558.0[m]SWC2560.0[m]SWC2564.0[m]DC2568.3[m]C2569.0[m]C2573.0[m]SWC2579.0[m]DC2581.2[m]SWC2586.7[m]SWC2589.7[m]SWC2593.3[m]C2594.0[m]DC2596.5[m]C2597.0[m]C2597.6[m]SWC2598.4[m]C2602.3[m]C2602.5[m]C2603.8[m]C2609.0[m]DC2613.5[m]C2613.7[m]C2623.7[m]C2624.0[m]DC2626.5[m]C2626.7[m]C2626.7[m]C2639.0[m]DC2641.0[m]C2645.0[m]DC2678.2[m]C2687.0[m]DC2690.0[m]DC2692.7[m]SWC2701.2[m]SWC2702.0[m]DC2718.7[m]SWC2720.0[m]DC2735.0[m]DC2747.2[m]SWC2750.0[m]DC2752.7[m]SWC2765.0[m]DC2765.5[m]SWC2774.0[m]SWC2777.0[m]DC2780.0[m]DC -
Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableDSTDST 12590.002597.00CONDENSATE28.11.1982 - 00:00YESDSTDST 1,12565.002572.0028.11.1982 - 00:00YESDSTDST22525.002535.00CONDENSATE30.11.1982 - 00:00YESDSTDST 2,12500.002535.00CONDENSATE30.11.1982 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1038481061205220522099216622202229222922382408246524932520252025212521 -
Geochemical information
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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]pdf47.47pdf8.64pdf5.73pdf33.12pdf0.74pdf2.19pdf4.05pdf3.16pdf6.10pdf5.90pdf8.40pdf13.03pdf12.57pdf15.46 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02590259716.72.02525253516.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.01993851100.7500.79019382.02534728900.7400.8001871 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CALI1651156CBL VDL21002707CDL CNL12782779CDM17002779CDM AP17002779DLL MLL25002779FMT25232743IEL BHC AC GR1652778TEMP1101840VELOCITY1652778 -
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 typeCONDUCTOR30165.036165.00.00LOTSURF.COND.20458.026473.01.62LOTINTERM.13 3/81277.417 1/21293.01.80LOTINTERM.9 5/82271.012 1/42286.01.87LOTLINER72776.08 1/22781.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1661.04seawater4651.06seawater11251.11seawater13081.11seawa/gel20511.25seawa/gel22861.25seawa/gel26071.40seawa/gel27811.30seawa/gel -
Pressure plots
Pressure plots The pore pressure data is sourced from well logs if no other source is specified. In some wells where pore pressure logs do not exist, information from Drill stem tests and kicks have been used. The data has been reported to the NPD, and further processed and quality controlled by IHS Markit.Pressure plots Document nameDocument formatDocument size [MB]pdf0.22