24/12-1
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General information
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Wellbore history
GeneralWell 24/12-1 is located on the Gudrun Terrace ca 15 km east of the border to British sector. The purpose of the well was to evaluate a seismic closure, named Gamma, in the southern part of the Block. The main target was the Middle Jurassic sands. Well 24/12-1 was the first of two phases in drilling the borehole, and this first phase was planned to reach the Early Cretaceous only. The main target was planned to be reached in a later re-entry with a different rig than was available at the time when the well was scheduled.The well is Type Well for the Skade Formation and Reference Well for the Grid Formation.Operations and resultsWildcat well 24/12-1 was spudded with the semi-submersible installation Ross Rig on 16 January 1978. At the time when the well was to be spudded, Statoil did not have available a rig equipped with a 15000 psi BOP stack and associated equipment. The well was therefore spudded with Ross Rig, which was equipped with a 10000 psi BOP. Ross Rig drilled the well down to 3966 m in the Early Cretaceous Sola Formation. The 9 5/8" casing was set and the well was temporarily plugged and abandoned. The problems experienced during PHASE I were primarily related to weather (anchor chain breakage and WOW), BOP-stack, and items lost into the hole and the sea. The well was drilled with seawater and gel from down to 771 m, with lignosulphonate mud from 771 m to 2874 m, and with lignosulphonate/lignite/CMC from 7874 m to TD. From 2870 m 1 % to 8% oil was added to the mud.Tertiary sandstone intervals were encountered in the Utsira Formation (497 m to 730 m), the Skade Formation (825 m to 1007 m), the Grid Formation (1502 m to 1660 m), and in the Paleocene Heimdal Formation (2326 m to 2700 m). No shows were encountered during drilling, but post-well organic geochemical analyses showed one cuttings sample from 2860 m to 2890 m to contain significant amounts of light hydrocarbons combined with a comparatively wet and mature cuttings gas. This could indicate migrated hydrocarbons, but the addition of oil to the mud at this depth makes the data inconclusive. Picked marl/clay lithology in the section from 3490 m to 3900 m (Coniacian to Albian) had TOC in the range 0.5% to 2.0 %, indicating fair source rock intervals in this section. No conventional cores were cut and no fluid samples taken.The well was permanently abandoned as dry on 9 April 1978.TestingNo drill stem test was performed -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?NOCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]190.004820.00 -
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 typeCONDUCTOR30186.036187.00.00LOTSURF.COND.20755.026771.00.00LOTINTERM.13 3/82855.017 1/22876.00.00LOTINTERM.9 1/23966.012 1/43966.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BHC GR38703973BHC GR41504823CBL GR37043963CBL VDL GR1262848FDC CNL GR41404823FDC GR7473958HDT28483974HDT41184680ISF GR41254822ISF SONIC GR1384823VELOCITY00 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit13849773285085010071502166021902190225523072326270027632768276827843080355036723681384838483945 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.60PDF1.32PDF5.04 -
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]pdf40.08pdf6.34pdf5.22pdf18.59PDF1.32PDF5.04 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3751.1075.0water based6801.1045.0water based12081.1440.0water based24461.2657.0water based28321.2544.0water based30171.1943.0water based33921.2149.0water based39801.4051.0water based -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory520.0[m]DCOD550.0[m]DCOD630.0[m]DCOD660.0[m]DCOD670.0[m]DCOD730.0[m]DCOD770.0[m]DCOD780.0[m]DCOD800.0[m]DCOD930.0[m]DCOD970.0[m]DCOD980.0[m]DCOD1050.0[m]DCOD1060.0[m]DCOD1070.0[m]DCOD1080.0[m]DCOD1090.0[m]DCOD2169.0[m]DCOD2181.0[m]DCOD2187.0[m]DCOD2199.0[m]DCOD2208.0[m]DCOD2220.0[m]DCOD2229.0[m]DCOD2238.0[m]DCOD2250.0[m]DCOD2259.0[m]DCOD2268.0[m]DCOD2280.0[m]DCOD2289.0[m]DCOD2298.0[m]DCOD2310.0[m]DCOD2319.0[m]DCOD2328.0[m]DCOD2340.0[m]DCOD2349.0[m]DCOD2358.0[m]DCOD2367.0[m]DCOD2379.0[m]DCOD2388.0[m]DCOD2397.0[m]DCOD2409.0[m]DCOD2418.0[m]DCOD2427.0[m]DCOD2439.0[m]DCOD2448.0[m]DCOD2460.0[m]DCOD2469.0[m]DCOD2478.0[m]DCOD2487.0[m]DCOD2499.0[m]DCOD2508.0[m]DCOD2517.0[m]DCOD2532.0[m]DCOD2538.0[m]DCOD2547.0[m]DCOD2559.0[m]DCOD2568.0[m]DCOD2577.0[m]DCOD2589.0[m]DCOD2598.0[m]DCOD2610.0[m]DCOD2619.0[m]DCOD2628.0[m]DCOD2637.0[m]DCOD2649.0[m]DCOD2658.0[m]DCOD2670.0[m]DCOD2679.0[m]DCOD2688.0[m]DCOD2697.0[m]DCOD2709.0[m]DCOD2718.0[m]DCOD2727.0[m]DCOD2739.0[m]DCOD2748.0[m]DCOD2760.0[m]DCOD2769.0[m]DCOD2778.0[m]DCOD3747.0[m]DC3918.0[m]DC3945.0[m]DC3948.0[m]DC4031.0[m]DC4046.0[m]DC4076.0[m]DC4115.0[m]DC4151.0[m]DC4173.6[m]C4178.0[m]DC4181.6[m]C4196.0[m]DC4292.0[m]DC4337.0[m]DC4337.0[m]DC4394.0[m]DC4499.0[m]DC4508.0[m]DC4613.0[m]DC4649.0[m]DC4655.0[m]DC4712.0[m]DC4721.0[m]DC4742.0[m]DC