34/8-5
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General information
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Wellbore history
GeneralWell 34/8-5 is located on the A-structure on the Visund Field. This is a NNE-SSW oriented elongated fault block with the Pre-Cretaceous strata dipping towards WNW. The A-Central fault divides the A-structure into the A-North and A-South compartments. Well 34/8-5 was drilled on the southern part of the A-South compartment, ca 6 kilometres SSW of Visund Discovery well 34/8-1. The primary objective was to appraise the Jurassic Brent Group. A secondary objective was to test reservoir quality of an Oligocene submarine fan system. Possible shallow gas was predicted at 604 and 793 m.Operations and resultsAppraisal well 34/8-5 was spudded with the semi-submersible installation Transocean 8 on 18 February 1991 and drilled to TD at 3540 m (3528 m TVD) in the Late Triassic Lunde Formation. The 36" hole was drilled to TD at 406 m, but when attempting to stab in the 30" casing the hole could not be located. The well was re-spudded and this time with success. An 8 1/2" pilot hole was drilled from 406 m to 850 m to check for shallow gas. No gas was observed. The well was planned vertical, but built some angle below 2660 m, and at ca 2720 m the deviation was ca 10 deg. This angle kept down to TD resulting in a 12 m discrepancy between measured and vertical depth at TD. There were also some hole curable problems during logging, but otherwise operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 1197 m and with KCl/polymer mud from 1197 m to TD.Thinly developed water bearing Oligocene and Eocene sands were encountered. The Brent Group was encountered at 2855 m and was found water bearing with oil shows on the cores. The shows continued down to 2977 m. Otherwise there were no shows or other hydrocarbon indications in the well.Seven cores were cut from 2855 m to 3048.5 m in the Brent Group, one core from a sand at 3354 m to 3375.3 m in the Amundsen Formation, and one from 3406 to 3419.5 m in the Statfjord Formation. The RFT tool was run for pressure points, but no fluid samples were taken.The well was permanently abandoned on 1 April 1991 as a dry well with shows.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]1200.003540.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12855.02881.0[m ]22883.02911.0[m ]32910.52931.0[m ]42931.52959.5[m ]52959.52985.3[m ]62986.52999.0[m ]73033.33049.0[m ]83354.03375.3[m ]93406.03419.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]191.3Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 availableDST0.000.0013.04.1991 - 00:00YES -
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 typeCONDUCTOR30406.036406.00.00LOTINTERM.13 3/81186.017 1/21197.01.53LOTINTERM.9 5/82600.012 1/42612.01.82LOTOPEN HOLE3540.08 1/23540.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CST12182142CST26342854DIL LSS11862569DIL SDT26043538FMS426043541LDL CNL11862569LDL CNL NGL26043538LWD409850MWD3203540RFT28563020RFT33603416VSP13003440 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit32010641118140615341839183918831918206520652322281928302830283328552855289129702983304630493049312231863249338434843484 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.14pdf2.63 -
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]pdf3.42pdf17.68 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3451.20WATER BASED20.02.19914061.20WATER BASED21.02.19914061.20WATER BASED19.02.19917461.20WATER BASED22.02.19919411.10WATER BASED26.02.199111971.10WATER BASED26.02.199111971.0915.07.0WATER BASED26.02.199111971.1514.08.0WATER BASED26.02.199115321.2014.08.0WATER BASED27.02.199119341.3516.08.0WATER BASED28.02.199125491.6036.09.0WATER BASED27.03.199126121.4026.010.0WATER BASED05.03.199126121.4124.09.0WATER BASED05.03.199126121.4221.08.0WATER BASED05.03.199126181.4522.04.0WATER BASED05.03.199126881.6020.05.0WATER BASED06.03.199127421.5923.06.0WATER BASED07.03.199128551.6026.08.0WATER BASED08.03.199128941.6026.09.0WATER BASED11.03.199129301.6028.08.0WATER BASED11.03.199129601.6028.08.0WATER BASED11.03.199130261.6126.08.0WATER BASED12.03.199130491.6027.09.0WATER BASED13.03.199130491.6027.08.0WATER BASED14.03.199131001.6035.09.0WATER BASED26.03.199131181.6027.08.0WATER BASED15.03.199131181.6027.08.0WATER BASED15.03.199133351.6029.09.0WATER BASED18.03.199133561.6028.08.0WATER BASED18.03.199133751.6029.09.0WATER BASED18.03.199134061.6028.08.0WATER BASED20.03.199134471.5926.09.0WATER BASED20.03.199135401.6030.09.0WATER BASED22.03.199135401.6030.09.0WATER BASED26.03.199135401.6030.010.0WATER BASED26.03.199135401.6037.010.0WATER BASED26.03.199135401.6029.09.0WATER BASED21.03.1991 -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1218.5[m]SWCHYDRO1249.0[m]SWCHYDRO1268.5[m]SWCHYDRO1281.5[m]SWCHYDRO1288.0[m]SWCHYDRO1306.0[m]SWCHYDRO1329.0[m]SWCHYDRO1342.5[m]SWCHYDRO1355.0[m]SWCHYDRO1364.5[m]SWCHYDRO1377.0[m]SWCHYDRO1394.0[m]SWCHYDRO1436.0[m]SWCHYDRO1446.0[m]SWCHYDRO1467.0[m]SWCHYDRO1484.0[m]SWCHYDRO1491.5[m]SWCHYDRO1502.0[m]SWCHYDRO1542.5[m]SWCHYDRO1551.0[m]SWCHYDRO1561.0[m]SWCHYDRO1838.0[m]SWCHYDRO1858.0[m]SWCHYDRO1927.5[m]SWCHYDRO2038.0[m]SWCHYDRO2699.5[m]SWCHYDRO2749.0[m]SWCHYDRO2832.0[m]SWCHYDRO2852.0[m]SWCHYDRO2856.9[m]CHYDRO2858.9[m]CHYDRO2860.0[m]CHYDRO2862.6[m]CHYDRO2864.4[m]CHYDRO2869.8[m]CHYDRO2875.5[m]CHYDRO2880.2[m]CHYDRO2885.6[m]CHYDRO2887.7[m]CHYDRO2890.2[m]CHYDRO2890.8[m]CHYDRO2891.8[m]CHYDRO2892.5[m]CHYDRO2896.7[m]CHYDRO2897.2[m]CHYDRO2898.5[m]CHYDRO2899.7[m]CHYDRO2903.4[m]CHYDRO2904.1[m]CHYDRO2908.7[m]CHYDRO2911.9[m]CHYDRO2913.5[m]CHYDRO2914.9[m]CHYDRO2918.5[m]CHYDRO2920.7[m]CHYDRO2921.7[m]CHYDRO2923.7[m]CHYDRO2924.2[m]CHYDRO2930.1[m]CHYDRO2932.4[m]CHYDRO2934.7[m]CHYDRO2938.4[m]CHYDRO2943.3[m]CHYDRO2945.0[m]CHYDRO2951.6[m]CHYDRO2952.3[m]CHYDRO2953.9[m]CHYDRO2956.7[m]CHYDRO2961.4[m]CHYDRO2962.3[m]CHYDRO2963.5[m]CHYDRO2966.4[m]CHYDRO2973.5[m]CHYDRO2978.6[m]CHYDRO2992.3[m]CHYDRO2998.2[m]CHYDRO