2/7-23 S
Export: PDF
-
General information
-
Wellbore history
GeneralWell 2/7-23 S was the fourth well drilled on the South Eldfisk (Embla) Field, which consists of a faulted structural high of assumed Palaeozoic sediments and volcanics. The structure is located on the eastern boundary of the Grensen Nose, a prominent faulted terrace marking the western edge of the Central Graben. The purpose of the well was to test the northward extension of the hydrocarbon bearing sandstones discovered in the 2/7-9 well in 1974 and confirmed by tests in the 2/7-20 and 2/7-21 S wells. If reservoir was proven, the intent was to complete the well in a manner suitable for a later tie-back to a production facility, where it would provide a third drainage point for future field development of the Embla Field.Operations and resultsAppraisal well 2/7-23 S was spudded with the semi-submersible installation West Delta on 15 May 1990 and drilled to TD at 4760 m in indeterminate pre-Jurassic sandstone. The well was drilled from the third slot in a three-slot temporary template located over the 2/7-20 well. The 2/7-23 S well was deviated to a target location at the Base Cretaceous level 1227 m north of the wellhead. Shallow gas was encountered at 593 m and caused some operational problems. The drilling went on without significant problems to TD, but during preparations for testing the drill string got stuck. Attempts to work the pipe free met with no success and the pipe had to be cut. The remainder of the drill string could not be retrieved and it was decided to abandon the well without testing. The well was drilled using KCL/Soltex/Aktaflo-S water based drilling fluid down to the 9 5/8" casing depth at 4229 m. Below this point and for the remainder of the well Enviromul oil based mud was used.The well penetrated 4 m of Late Jurassic shale (Mandal Formation) at 4408 m. The target pre-Jurassic reservoir sands were encountered at 4412 m, 74 m TVD deeper than prognosed. The reservoir was oil-bearing. No distinct oil-water contact was seen, but from electric logs and RFT pressure data an oil column of ca 200 m can be inferred.Hydrocarbon shows were recorded between 1524 - 1645.9 m in base Nordland / top Hordaland Group as moderate to good dull yellow-brown fluorescence in the cuttings. Oil shows were also recorded in the Shetland Group, with peak shows at 3254 m in the Ekofisk Formation, at 3323 m in the Tor Formation, and at 3625.6 m, 3886.5 m, and at 3973 - 3977.6 m in the Hod Formation. Below 4229 m true oil shows could not be distinguished from the oil based mudAn attempted coring in the Early Cretaceous did not recover any core. Twenty cores were cut in the reservoir section with a total core recovery of 273 m. No wire line fluid samples were taken.The well was suspended on 21 November 1990 as an oil appraisal well.TestingDue to technical problems no DST tests were performed in this well. -
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]1085.005124.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom214520.014586.0[ft ]314586.014647.0[ft ]414647.014658.0[ft ]514658.014685.0[ft ]614692.014750.0[ft ]714750.014774.0[ft ]814777.014795.0[ft ]914795.014813.0[ft ]1014813.014857.0[ft ]1114857.014913.0[ft ]1214913.014975.0[ft ]1314975.015020.0[ft ]1415020.015111.0[ft ]1515111.015174.0[ft ]1615174.015210.6[ft ]1715211.015257.0[ft ]1815257.015296.0[ft ]1915296.015328.0[ft ]2015329.015390.0[ft ]2115390.015480.0[ft ]Cores at the Norwegian Offshore Directorate Total core sample length [m]289.1Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
-
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory4012.0[m]DCRRI4414.0[m]DCRRI4439.0[m]CRRI4474.0[m]DCRRI4490.0[m]DCRRI4502.0[m]DCRRI4520.0[m]DCRRI4535.0[m]DCRRI4566.0[m]DCRRI4581.0[m]DCRRI4596.0[m]DCRRI4627.0[m]DCRRI4642.0[m]DCRRI4657.0[m]DCRRI4673.0[m]DCRRI4685.0[m]DCRRI4718.0[m]DCRRI4743.0[m]DCRRI4760.0[m]DCRRI -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1001609309030903108316032023231323133153577414341504213421343014322440844084412 -
Geochemical information
-
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DIL LDL SLS MSFL GR35007233DIL SDT GR AMS1385415601DLL LSL MSFL GR AMS839113848DSI GR AMS839113859EPT GR AMS1384615584FMS GR AMS1060013878LDL CNL BHC NGS AMS839113860LDL CNL NGS AMS1384615616MWD RWD - GR RES DIR96014201OBDT GR1384615600RFT GR1449115554VELOCITY350015601 -
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 typeCONDUCTOR30173.036174.00.00LOTINTERM.201066.0261070.01.92LOTINTERM.13 3/82559.017 1/22600.02.02LOTINTERM.9 5/84224.012 1/44230.02.17LOTLINER6 5/84758.08 1/24760.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured961.8043.014.4WATER BASED21.11.19901151.03WATER BASED22.05.19901741.03WATER BASED22.05.19901741.03WATER BASED22.05.19901741.04WATER BASED22.05.19902611.04WATER BASED22.05.19903841.04WATER BASED22.05.19906331.04WATER BASED22.05.19907491.04WATER BASED23.05.199010761.04WATER BASED28.05.199010761.04WATER BASED25.05.199010761.04WATER BASED25.05.199010761.04WATER BASED28.05.199010761.2825.043.6WATER BASED29.05.199010791.3433.028.7WATER BASED30.05.199010911.3434.029.7WATER BASED31.05.199012581.3337.011.0WATER BASED01.06.199015241.3929.012.0WATER BASED06.06.199015241.4434.011.0WATER BASED06.06.199017741.5628.09.6WATER BASED06.06.199017741.5625.09.1WATER BASED06.06.199017741.5626.09.6WATER BASED06.06.199020071.6227.011.0WATER BASED07.06.199020731.6529.010.1WATER BASED11.06.199022531.6532.010.1WATER BASED11.06.199025021.6733.08.1WATER BASED11.06.199025731.6532.07.7WATER BASED11.06.199025731.6832.09.6WATER BASED13.06.199025731.7038.010.1WATER BASED14.06.199025731.7037.010.5WATER BASED14.06.199025731.6932.08.6WATER BASED18.06.199025761.7033.08.1WATER BASED18.06.199025821.7030.07.7WATER BASED18.06.199028481.7031.08.1WATER BASED19.06.199030941.7036.08.6WATER BASED20.06.199031821.7033.08.6WATER BASED22.06.199031821.7133.010.5WATER BASED25.06.199032251.7032.012.9WATER BASED25.06.199032361.7032.013.4WATER BASED25.06.199032751.7035.016.3WATER BASED25.06.199033321.7333.016.3WATER BASED26.06.199034141.7336.012.0WATER BASED27.06.199034451.7339.013.4WATER BASED28.06.199034611.7338.09.6WATER BASED02.07.199035021.7342.010.1WATER BASED02.07.199035271.7344.011.5WATER BASED02.07.199035741.7347.08.1WATER BASED02.07.199036871.7343.010.1WATER BASED03.07.199037441.7347.012.4WATER BASED04.07.199037701.7345.013.4WATER BASED05.07.199037701.7343.011.0WATER BASED09.07.199038411.7144.010.5WATER BASED09.07.199038831.7144.011.0WATER BASED09.07.199039431.6944.011.0WATER BASED10.07.199039711.6944.010.5WATER BASED11.07.199039801.6946.011.5WATER BASED12.07.199040291.6945.010.5WATER BASED13.07.199040481.6944.010.1WATER BASED16.07.199040741.6943.012.4WATER BASED16.07.199040741.6944.011.0WATER BASED16.07.199041091.6943.011.5WATER BASED17.07.199041351.6944.013.9WATER BASED18.07.199041351.8140.09.6WATER BASED20.07.199041631.8041.08.6WATER BASED20.07.199041641.8044.012.9WATER BASED26.07.199041781.8040.08.6WATER BASED26.07.199041941.8038.07.7WATER BASED26.07.199042081.8040.09.1WATER BASED26.07.199042221.8039.08.1WATER BASED26.07.199042231.8142.07.2WATER BASED27.07.199042231.8039.08.1WATER BASED26.07.199042291.8037.08.6WATER BASED31.07.199042291.8039.08.1WATER BASED31.07.199042291.8040.08.1WATER BASED31.07.199042291.8140.09.1WATER BASED01.08.199042291.8140.08.6WATER BASED01.08.199042291.8039.09.6WATER BASED02.08.199042291.8040.010.1WATER BASED03.08.199042291.8034.011.0WATER BASED06.08.199042291.8035.09.6WATER BASED06.08.199042290.00WATER BASED06.08.199042321.9450.021.1WATER BASED10.08.199042652.0632.010.1WATER BASED10.08.199042922.0636.014.4WATER BASED13.08.199042922.0932.09.6WATER BASED13.08.199042922.0933.08.1WATER BASED13.08.199042962.0932.08.6WATER BASED14.08.199043292.0931.09.6WATER BASED15.08.199043332.0930.09.1WATER BASED16.08.199043392.0932.07.2WATER BASED17.08.199043960.8931.07.7WATER BASED20.08.199044212.0931.09.1WATER BASED20.08.199044412.0918.015.8WATER BASED20.08.199044502.0933.08.6WATER BASED21.08.199044622.0931.09.1OIL BASED22.08.199044742.0932.08.6OIL BASED23.08.199044902.0932.08.6OIL BASED27.08.199044972.0933.08.6WATER BASED27.08.199045042.0931.08.6WATER BASED27.08.199045152.0933.010.1WATER BASED29.08.199045282.0933.07.2WATER BASED30.08.199045442.0932.08.1WATER BASED30.08.199045642.1031.08.6WATER BASED03.09.199045772.0933.010.5WATER BASED03.09.199046002.1034.08.6WATER BASED03.09.199046062.0934.07.2WATER BASED04.09.199046252.1034.08.6WATER BASED05.09.199046352.0935.08.1WATER BASED06.09.199046482.0933.08.1WATER BASED07.09.199046512.0929.07.2WATER BASED10.09.199046512.1027.07.2WATER BASED10.09.199046632.1028.08.1WATER BASED10.09.199046682.1029.07.7WATER BASED11.09.199046912.1033.07.2WATER BASED14.09.199047132.1029.07.7WATER BASED14.09.199047182.1031.08.1WATER BASED17.09.199047242.1032.07.2WATER BASED17.09.199047252.1029.07.2WATER BASED17.09.199047402.1030.07.2WATER BASED19.09.199047592.1033.07.7WATER BASED19.09.199047602.1034.08.6WATER BASED20.09.199047602.1138.09.1WATER BASED24.09.199047602.1048.011.0WATER BASED24.09.199047602.1150.011.5WATER BASED24.09.199047602.1139.07.2WATER BASED25.09.199047602.1240.08.1WATER BASED26.09.199047602.1350.08.6WATER BASED27.09.199047602.1139.07.2WATER BASED28.09.199047602.1141.07.7WATER BASED01.10.199047602.1140.07.2WATER BASED02.10.199047602.1143.09.1WATER BASED04.10.199047602.1143.09.1WATER BASED05.10.199047602.1151.09.1WATER BASED08.10.199047602.1656.010.5WATER BASED08.10.199047602.1143.08.1WATER BASED08.10.199047602.1145.08.1WATER BASED09.10.199047602.1143.08.6WATER BASED11.10.199047602.1143.08.1WATER BASED11.10.199047602.1142.09.6WATER BASED15.10.199047602.1145.09.1WATER BASED15.10.199047602.1147.08.6WATER BASED16.10.199047602.1149.011.5WATER BASED17.10.199047602.1150.012.9WATER BASED18.10.199047602.1147.010.1WATER BASED22.10.199047602.1147.010.1WATER BASED22.10.199047602.1143.012.0WATER BASED22.10.199047602.1148.010.5WATER BASED23.10.199047602.1149.010.1WATER BASED24.10.199047602.1250.011.0WATER BASED25.10.199047602.1146.010.5WATER BASED26.10.199047602.1149.09.6WATER BASED31.10.199047602.1149.010.1WATER BASED31.10.199047602.1149.012.0WATER BASED31.10.199047602.1151.010.5WATER BASED31.10.199047602.0550.010.1WATER BASED31.10.199047602.1153.010.1WATER BASED05.11.199047602.1151.010.1WATER BASED05.11.199047602.1152.07.7WATER BASED05.11.199047602.1154.09.1WATER BASED05.11.199047602.1149.011.0WATER BASED05.11.199047602.1153.011.0WATER BASED06.11.199047602.1159.010.1WATER BASED09.11.199047602.1156.010.1WATER BASED09.11.199047602.1153.09.6WATER BASED13.11.199047602.0545.07.2WATER BASED13.11.199047601.8058.021.1WATER BASED13.11.199047601.8055.021.5WATER BASED15.11.199047601.8051.020.1WATER BASED16.11.199047601.7946.016.8WATER BASED20.11.199047601.7948.015.3WATER BASED20.11.199047601.8043.014.8WATER BASED20.11.199047602.1141.08.1WATER BASED01.10.199047602.1140.07.2WATER BASED01.10.199047602.1143.09.1WATER BASED03.10.199047602.1146.08.1WATER BASED15.10.199047602.1147.08.6WATER BASED15.10.199047602.1150.012.9WATER BASED22.10.199047602.1151.09.6WATER BASED13.11.199047601.8067.015.3WATER BASED14.11.199047601.8048.017.2WATER BASED20.11.1990 -
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]PDF0.21