30/6-16
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General information
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Wellbore history
GeneralWildcat well 30/6-16 was drilled on the Theta structure, immediately northwest of the main Oseberg Alpha North structure. The main objective of the well was to prove hydrocarbons in the Statfjord Formation. Planned TD was ca 3150 m or ca 225 m into the Statfjord Formation.Operations and resultsWildcat well 30/6-16 was spudded with the semi-submersible installation Treasure scout on 9 November 1984 and drilled to TD at 3300 m in the Triassic Hegre Group. Drilling proceeded without significant problems. The well was drilled with spud mud down to 613 m and with KCl/polymer mud from 613 m to TD.Good oil shows were reported on dolomite and limestone beds and stringers from 1993 to 2333 m in the Rogaland and Shetland groups. From 2605 to 2853 (Shetland Group) good oil shows were recorded in sandstones and siltstones as well as in limestones. The Brent Group was encountered at 2856 m and consisted of 12 m Etive Formation only. The Etive Formation was found to be oil bearing over the entire interval. The net pay was 6.3 m with average log porosity of 19.1%. Also the 26 m thick Cook Formation with top at 2920 m was oil bearing all through. Net pay here was 12.6 m with average log porosity of 19.0%. No oil/water contacts could be established. The Statfjord Formation had weak shows in the top 10 m, but was found to be water bearing. RFT pressure recordings and sampling were recorded in 5 runs. Different pressure regimes were proved for the Etive Formation, the Cook Formation and the Statfjord Group.Four cores were cut in the Etive and Drake Formations (2856 - 2909 m), two in the Cook and Amundsen/Burton formations (2923 - 2949 m) and one in the Statfjord Formation (2982 - 2990 m). RFT fluid samples were taken at 2857 m (oil, gas and water), 2929.5 m (water, gas and some oil) and 3194.5 m (water).The well was permanently abandoned on 21 January 1985 as an oil discovery.TestingTwo Drill Stem Tests were performed. Overall test data indicated severe depletion effects in both reservoirs.DST 1 tested the interval: 2919.6 - 2943.6 m in the Cook Formation. The average production was 183 Sm3 oil and 25500 Sm3 gas /day through a 36/64" choke. GOR was 139 Sm3/Sm3. Oil gravity was 29 deg API and gas gravity was 0.747 (rel. to air) with 2.4 % CO2 and no H2S. The bottom hole temperature in the test was 113.3 deg C.DST 2 tested the interval: 2855-2868 m in the Etive Formation. The average production was 685 Sm3 oil and 125000 Sm3 gas /day through a 68/64" choke. GOR was 182 Sm3/Sm3. Oil gravity was 36 deg API and gas gravity was 0.76 (rel. to air) with 2.3% CO2 and no H2S. The bottom hole temperature in the test was 113.4 deg C.A rapid decrease in production rate and well head pressure in the Etive Formation test indicate that the reservoir is of very limited size. -
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]230.003300.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12856.02866.0[m ]22866.02877.2[m ]32878.52889.9[m ]42890.02906.0[m ]52923.02937.4[m ]62937.42948.4[m ]72982.02989.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]81.8Cores 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 typeLaboratory2817.0[m]SWCRRI2837.0[m]SWCRRI2847.0[m]SWCRRI2850.0[m]SWCRRI2852.0[m]SWCRRI2884.1[m]COD2898.1[m]COD2914.0[m]SWCRRI2926.8[m]COD2956.5[m]SWCRRI2960.0[m]SWCRRI2975.5[m]SWCRRI3013.0[m]SWCRRI -
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 availableDSTDST12944.002920.0014.01.1985 - 00:00YESDSTDST22855.002868.0018.01.1985 - 00:00YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit13768590520012001208821782282230128522856285628682868292029462960296029673224 -
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]pdf11.47 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02920294415.91.12920294414.32.02855286827.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.03.0001.13.0002.010.00028.000Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.016524750.8800.747151.1175260000.8800.7471502.07101420000.8400.760200 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR4003221CBL VDL GR CCL23352906CET CAL15003221CST GR20022851CST GR28523293CST GR CCL15003221DLL MSFL GR28203230ISF LSS GR2243302ISF MSFL LSS GR28402984LDL CNL GR5972985LDL CNL NGT28203304RFT28552861RFT28553246RFT29262932RFT29262930RFT31943194SAT VSP6833303SAT VSP23512411SHDT20003304WGR320597 -
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 typeCONDUCTOR30223.536224.00.00LOTSURF.COND.20598.526613.01.43LOTINTERM.13 3/81703.017 1/21715.01.65LOTINTERM.9 5/83285.012 1/43300.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured2241.05WATER BASED12.11.19842241.08WATER BASED13.11.19842241.08WATER BASED13.11.19843021.08WATER BASED14.11.19846131.0812.030.0WATER BASED15.11.19846131.1414.032.0WATER BASED16.11.19846131.1414.032.0WATER BASED16.11.19846271.1419.013.0WATER BASED21.11.198412311.1618.012.0WATER BASED22.11.198412411.1618.013.0WATER BASED23.11.198414151.1720.012.0WATER BASED26.11.198417151.1719.012.0WATER BASED26.11.198417151.1920.013.0WATER BASED26.11.198417151.1822.012.0WATER BASED27.11.198417151.1920.013.0WATER BASED26.11.198417151.1822.012.0WATER BASED27.11.198417151.2020.010.0WATER BASED28.11.198417151.2020.010.0WATER BASED28.11.198417731.3024.013.0WATER BASED29.11.198420001.4032.014.0WATER BASED30.11.198421601.4027.010.0WATER BASED04.12.198421681.4033.011.0WATER BASED04.12.198423501.4030.010.0WATER BASED04.12.198424621.4032.013.0WATER BASED04.12.198425661.4029.010.0WATER BASED05.12.198426721.4028.010.0WATER BASED06.12.198427281.4028.010.0WATER BASED07.12.198428041.4030.011.0WATER BASED11.12.198428561.4028.0WATER BASED11.12.198428591.4025.011.0WATER BASED11.12.198428601.3528.011.0WATER BASED12.12.198428600.0028.012.0WATER BASED15.12.198428600.0030.013.0WATER BASED15.12.198428600.0031.012.0WATER BASED15.12.198428600.0029.012.0WATER BASED15.12.198428601.3529.012.0WATER BASED20.12.198428601.3630.012.0WATER BASED20.12.198428601.3523.010.0WATER BASED11.12.198428601.3528.014.0WATER BASED11.12.198428601.3530.013.0WATER BASED16.12.198428601.3630.012.0WATER BASED20.12.198428601.3528.014.0WATER BASED11.12.198428601.3528.011.0WATER BASED12.12.198428601.3528.012.0WATER BASED16.12.198428601.3631.012.0WATER BASED16.12.198428601.3529.012.0WATER BASED16.12.198428601.3529.012.0WATER BASED20.12.198428841.32WATER BASED14.01.198528841.32WATER BASED18.01.198528841.32WATER BASED07.01.198528841.32WATER BASED15.01.198528841.32WATER BASED17.01.198528841.32WATER BASED21.01.198528841.32WATER BASED06.01.198528841.32WATER BASED07.01.198528841.32WATER BASED14.01.198528841.32WATER BASED15.01.198528841.32WATER BASED17.01.198528841.32WATER BASED18.01.198528841.32WATER BASED21.01.198529261.3528.011.0WATER BASED13.12.198431601.3629.012.0WATER BASED19.12.198431601.3629.012.0WATER BASED18.12.198432241.32WATER BASED01.01.198532241.32WATER BASED01.01.198532241.32WATER BASED02.01.198532241.32WATER BASED03.01.198532241.32WATER BASED06.01.198532241.32WATER BASED03.01.198532241.3654.0WATER BASED01.01.198532241.32WATER BASED01.01.198532241.32WATER BASED01.01.198532241.32WATER BASED02.01.198532241.32WATER BASED06.01.198533001.3529.012.0WATER BASED26.12.198433001.35WATER BASED26.12.198433001.3530.012.0WATER BASED26.12.198433001.3530.011.0WATER BASED26.12.198433001.36WATER BASED27.12.198433001.3629.012.0WATER BASED26.12.198433001.3629.012.0WATER BASED26.12.198433001.35WATER BASED26.12.198433001.3530.012.0WATER BASED26.12.198433001.3530.011.0WATER BASED26.12.198433001.36WATER BASED27.12.1984 -
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]pdf0.23