6507/11-5 S
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General information
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Wellbore history
GeneralThe Midgard field is situated in the northeastern part of the Halten Terrace on a north south trending horst system, which is separated into 4 major segments. Four wells have been drilled on the Midgard Field, one in each of the segments Alfa, Beta, Gamma and Delta. Well 6507/11-5S was drilled as an appraisal well in the Gamma segment. The main objective of the well was to confirm the oil zone in the Ile Formation and to become a future gas producer on the Midgard field. The well should collect data on reservoir quality and fluid distribution related to both the oil and gas zones in the Midgard field.Operations and resultsWildcat well 6507/11-5 S was spudded with the semi-submersible installation Deepsea Trym on 5 September 1997 and drilled to TD at 2695 m in the Middle Jurassic Ror Formation. Major operational problems were encountered leading to significant downtime. Firstly, one day was lost when the well drilled into shallow gas class II at 582 m. The well was killed and a cement plug was set. The 20" casing had to be set above the shallow gas zone. Second, fourteen days were lost due to heave compensator failures. Third, three days were lost when logging tools got stuck and failures on logging equipment appeared. The well was vertical down to 700 m where it built angle to 19.5 deg at 1350 m. This angle was kept down to TD. The well was drilled with seawater and hi-vis pills down to 547 m and with KCl/PAC mud from 547 m to TD.The 6507 /11-5 S well proved 114 m TVD of gas and 11.5 m TVD of oil in the Fangst Group. This was deduced from FMT sampling and petrophysical evaluation of wire line logs. The GOC was found at 2605 m (2515 m TVD RKB) and the OWC at 2617.4 m (2526.5 m TVD RKB). Three wire line fluid samples were taken in Ile (FMT gas sample at 2592.9 m, RCI oil sample at 2608.3 m, and FMT water sample at 2622.1 m), and one in Garn (FMT gas sample at 2500 m).The well was suspended on 28 October as an oil and gas appraisal well. It was re-entered in January 2000 and taken in use as a gas producer.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]560.002484.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12488.02508.0[m ]22508.02534.7[m ]32535.02539.6[m ]42541.02554.0[m ]52554.02582.0[m ]62582.02608.5[m ]72609.02645.3[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]155.0Cores 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 typeCONDUCTOR30340.036342.00.00LOTSURF.COND.20542.026544.01.30LOTINTERM.13 3/81533.017 1/21534.01.90LOTINTERM.9 5/82479.012 1/42480.00.00LOTOPEN HOLE2695.08 1/22695.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DLL MLL MAC DSL CHT24782693FMT QD GR CHT25002500FMT QD GR CHT25922592FMT QD GR CHT26222622MWD2812695RCI GR TTRM24852523VSP GR CHT13782690ZDL CND GR CHT24782692 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit2812811401155015502018201820622151215122262310239323932420243424342445248424842539255426242624 -
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]pdf2.70pdf22.19 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured15361.1821.0QUADRILL15981.39DUMMY21001.5532.0QUADRILL24841.2024.0QUADRILL25081.2020.0QUADRILL25411.2024.0QUADRILL25541.2018.0QUADRILL26961.2017.0QUADRILL -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1710.0[m]DCRRI1720.0[m]DCRRI1740.0[m]DCRRI1750.0[m]DCRRI1770.0[m]DCRRI1780.0[m]DCRRI1800.0[m]DCRRI1810.0[m]DCRRI1830.0[m]DCRRI1840.0[m]DCRRI1860.0[m]DCRRI1870.0[m]DCRRI1890.0[m]DCRRI1900.0[m]DCRRI1920.0[m]DCRRI1930.0[m]DCRRI1950.0[m]DCRRI1960.0[m]DCRRI1980.0[m]DCRRI1990.0[m]DCRRI2000.0[m]DCRRI2020.0[m]DCRRI2040.0[m]DCRRI2050.0[m]DCRRI2070.0[m]DCRRI2090.0[m]DCRRI2100.0[m]DCRRI2110.0[m]DCRRI2130.0[m]DCRRI2140.0[m]DCRRI2160.0[m]DCRRI2170.0[m]DCRRI2190.0[m]DCRRI2200.0[m]DCRRI2230.0[m]DCRRI2250.0[m]DCRRI2260.0[m]DCRRI2270.0[m]DCRRI2290.0[m]DCRRI2313.0[m]DCRRI2325.0[m]DCRRI2340.0[m]DCRRI2355.0[m]DCRRI2370.0[m]DCRRI2373.0[m]DCRRI2382.0[m]DCRRI2391.0[m]DCRRI2400.0[m]DCRRI2403.0[m]DCRRI2412.0[m]DCRRI2418.0[m]DCRRI2424.0[m]DCRRI2430.0[m]DCRRI2439.0[m]DCRRI2442.0[m]DCRRI2448.0[m]DCRRI2457.0[m]DCRRI2460.0[m]DCRRI2463.0[m]DCRRI2472.0[m]DCRRI2478.0[m]DCRRI2484.0[m]DCRRI2488.1[m]CRRI2495.0[m]CRRI2499.8[m]CRRI2528.0[m]CRRI2535.4[m]CRRI2541.1[m]CRRI2546.8[m]CRRI2550.9[m]CRRI2554.5[m]CRRI2559.8[m]CRRI2572.0[m]CRRI2576.9[m]CRRI2582.1[m]CRRI2588.6[m]CRRI2594.8[m]CRRI2600.3[m]CRRI2612.5[m]CRRI2618.8[m]CRRI2623.6[m]CRRI2629.7[m]CRRI2636.7[m]CRRI2640.3[m]CRRI2644.3[m]CRRI