24/6-1
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General information
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Wellbore history
GeneralWildcat well 24/6-1 was drilled on a structure due west of the Heimdal discovery and approximately 1.5 km east of the UK-Norwegian median line. The purpose of the well was to test superimposed prospects: Paleocene Heimdal sands, which exhibited a large structural high, and middle Jurassic Vestland Group sandstones on an intra-basin high faulted panel, dipping to the west and bounded to the north, east, and south by normal faults.Operations and resultsWildcat well 24/6-1 was spudded with the semi-submersible installation Zapata Ugland on 9 February 1985 and drilled to TD at 4937 m in Early Jurassic sediments of the Statfjord Formation. Some problems were experienced while cutting core no 2, due to weak formation below the 9 5/8" shoe. The hole was plugged back to 4460 m, and a cement squeeze was performed. This turned out to be not entirely successful, and the hole was drilled to 4540 m where a 7" liner was set. Further drilling proceeded without problems. The well was drilled with bentonite/polymer/lignosulphonate above 2820 m and with oil based mud from 2820 m to TDThe thick Palaeocene sands were found water bearing. The Turonian series (Tryggvason Formation) contained gas bearing limestone reservoirs, which proved to be tight. Top of the Middle Jurassic Hugin reservoir came in at 4478 m. It held a 100 m gas/condensate column with the gas/water contact at 4578 m. Five conventional cores were cut over the Heimdal Formation and Hugin Formation sandstones. Five RFT fluid samples were taken in the Hugin Formation at 4514.3 (gas + trace condensate), 4512 m (gas + trace condensate), 4787.5 m (mud filtrate), 4706 m (contaminated formation water), and at 4592 m (formation water). All samples showed unusual high oil filtrate recovery due to unexpected deep invasion by the oil base mud.The well was permanently abandoned on 25 August 1985 as a gas/condensate discovery.TestingOne drill stem test was performed in the interval 4502 m to 4537 m. It flowed 422000 Sm3 gas with 72 Sm3 condensate /day on a 20/64" choke. The gas/condensate ratio was 5890 sm3/sm3 with a condensate gravity of 48.8 deg API. -
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]210.004937.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12181.02182.6[m ]24479.04497.0[m ]34497.04513.5[m ]44623.04629.0[m ]54688.04701.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]55.6Cores 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 typeCONDUCTOR30199.036200.00.00LOTSURF.COND.20996.0261010.00.00LOTINTERM.13 3/82817.017 1/22830.01.75LOTINTERM.9 5/84095.012 1/44110.02.08LOTLINER74533.08 3/84537.00.00LOTOPEN HOLE4937.064937.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0450245377.9Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0754250000.7850.6405690 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BGT GR15002756BHC GR16002818CAL6501009CBL VDL18402821CBL VDL40024538CBL VDL GR348994CBL VDL GR26004099CBL VDL GR27004100CBL VDL GR42304539CST GR37054112CST GR41254537CST GR41824537CST GR47664938DIL BHC GR28214074DIL BHC GR41004538DIL BHC GR45394625DIL BHC GR45394906DIL BHC GR45394940DIL LSS GR199877DIL LSS GR1991009DIL LSS GR9962819GR40004074HDT28214114HDT41004539HDT45394941LDL CNL NGS15952820LDL CNL NGS28214114LDL CNL NGS41004539LDL CNL NGS EPT45394941RFT45454680RFT45524787RFT GR36783858RFT GR36783748RFT GR37083677RFT GR37093678RFT GR44854519SHDT15952821VELOCITY1994940WSS D4002820WSS-D26004920 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1498751263129520042004205020792083210221802485275828022802284436633925393241524152417741964196420544784478471647894915 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.75 -
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]pdf12.00pdf2.63 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1001.6520.010.0WATER BASED26.08.19851471.6520.010.0WATER BASED26.08.19851471.6520.010.0WATER BASED27.08.19851751.039999.99999.9WATER BASED10.02.19852001.039999.99999.9WATER BASED10.02.19852001.0717.03.4WATER BASED11.02.19852001.6520.010.0WATER BASED26.08.19852001.6520.010.0WATER BASED23.08.19854371.6520.010.0OIL BASED21.08.19855991.1223.06.8WATER BASED12.02.19858811.1220.03.4WATER BASED13.02.19859961.0614.06.0WATER BASED25.02.19859961.0614.06.0WATER BASED27.02.19859961.0614.06.0WATER BASED27.02.19859961.0614.06.0WATER BASED01.03.19859961.0614.06.0WATER BASED03.03.19859961.0614.06.0WATER BASED04.03.19859961.0614.06.0WATER BASED05.03.19859961.0614.06.0WATER BASED06.03.19859961.0614.06.0WATER BASED10.03.19859961.0614.06.0WATER BASED08.03.19859961.0614.06.0WATER BASED01.03.19859961.0614.06.0WATER BASED03.03.19859961.0614.06.0WATER BASED04.03.19859961.0614.06.0WATER BASED05.03.19859961.0614.06.0WATER BASED06.03.19859961.0614.06.0WATER BASED08.03.19859961.0614.06.0WATER BASED10.03.198510101.0811.03.5WATER BASED12.03.198510101.0812.02.9WATER BASED12.03.198510101.1120.03.0WATER BASED14.02.198510101.1321.04.0WATER BASED16.02.198510101.1222.03.0WATER BASED18.02.198510101.1422.04.0WATER BASED20.02.198510101.1013.04.0WATER BASED21.02.198510101.0611.06.6WATER BASED24.02.198510101.1119.04.0WATER BASED16.02.198510101.1321.04.0WATER BASED16.02.198510101.1222.03.0WATER BASED18.02.198510101.1422.04.0WATER BASED19.02.198510101.1422.04.0WATER BASED20.02.198510101.1013.04.0WATER BASED21.02.198510101.0611.06.6WATER BASED24.02.198510101.0811.03.5WATER BASED12.03.198510101.0812.02.9WATER BASED12.03.198510101.1119.04.0WATER BASED16.02.198510101.1422.04.0WATER BASED19.02.198510501.0815.02.9WATER BASED13.03.198511421.1122.03.4WATER BASED14.03.198513191.1218.03.0WATER BASED17.03.198515771.1619.03.2WATER BASED17.03.198516021.1719.03.8WATER BASED18.03.198516991.2021.08.5WATER BASED11.04.198518081.1720.03.4WATER BASED18.03.198518431.2120.08.5WATER BASED12.04.198519881.1721.04.0WATER BASED20.03.198520251.2119.07.4WATER BASED15.04.198520851.1719.03.9WATER BASED20.03.198521001.2119.07.5WATER BASED15.04.198521811.1921.08.5WATER BASED21.03.198521831.1926.08.4WATER BASED24.03.198522291.2120.08.5WATER BASED15.04.198522451.1920.06.5WATER BASED24.03.198522831.2019.08.5WATER BASED16.04.198522991.2018.07.5WATER BASED17.04.198523201.1716.06.6WATER BASED24.03.198523651.1716.06.6WATER BASED25.03.198523901.1717.06.6WATER BASED27.03.198523901.2118.06.7WATER BASED18.04.198523901.2118.06.7WATER BASED18.04.198524621.1718.07.6WATER BASED28.03.198524871.2117.06.4WATER BASED19.04.198525051.2118.06.7WATER BASED21.04.198525441.2119.07.6WATER BASED21.04.198525541.1719.07.5WATER BASED29.03.198525801.1719.07.5WATER BASED01.04.198525901.1720.07.5WATER BASED01.04.198526191.2119.07.6WATER BASED21.04.198526481.1717.06.6WATER BASED01.04.198527101.2118.07.6WATER BASED23.04.198527171.1718.06.6WATER BASED02.04.198527201.1718.06.6WATER BASED03.04.198527631.2118.07.6WATER BASED24.04.198527871.1717.06.7WATER BASED10.04.198527930.0021.07.5WATER BASED25.04.198528061.2119.07.5WATER BASED26.04.198528171.2632.013.0WATER BASED08.05.198528170.9012.01.0OIL BASED09.05.198528171.2626.016.0WATER BASED07.05.198528171.2632.013.0WATER BASED08.05.198528170.9012.01.0OIL BASED09.05.198528251.0418.07.5WATER BASED30.04.198528261.1717.06.7WATER BASED10.04.198528261.2120.07.6WATER BASED10.04.198528261.2222.08.6WATER BASED10.04.198528261.2120.08.6WATER BASED10.04.198528261.2120.07.6WATER BASED10.04.198528261.2121.07.8WATER BASED10.04.198528261.2222.08.6WATER BASED10.04.198528261.2121.07.8WATER BASED10.04.198528261.2120.08.6WATER BASED10.04.198528301.2424.012.0WATER BASED02.05.198528301.2625.015.0WATER BASED04.05.198528301.2524.03.8OIL BASED13.05.198528301.2221.09.5WATER BASED30.04.198528301.2623.028.0WATER BASED04.05.198528301.2221.09.5WATER BASED30.04.198528301.2321.09.5WATER BASED02.05.198528301.2626.015.3WATER BASED03.05.198528301.2623.028.0WATER BASED04.05.198528301.2625.014.0WATER BASED04.05.198528301.1023.01.5OIL BASED10.05.198528301.2423.01.4OIL BASED13.05.198528301.2429.02.8OIL BASED13.05.198528301.2535.03.3OIL BASED14.05.198528301.1023.01.5OIL BASED10.05.198528301.2423.01.4OIL BASED13.05.198528301.2524.03.8OIL BASED13.05.198528301.2429.02.8OIL BASED13.05.198528301.2535.03.3OIL BASED14.05.198528301.2118.07.5WATER BASED29.04.198528301.2321.09.5WATER BASED02.05.198528301.2424.012.0WATER BASED02.05.198528301.2626.015.3WATER BASED03.05.198528301.2625.015.0WATER BASED04.05.198528301.2625.014.0WATER BASED04.05.198528341.2631.03.8OIL BASED15.05.198528581.2628.03.8OIL BASED21.05.198530821.3820.04.8OIL BASED21.05.198532951.4022.04.7OIL BASED21.05.198534011.4821.04.8OIL BASED21.05.198535351.5123.04.8OIL BASED21.05.198536091.5023.010.0OIL BASED21.05.198536501.9436.014.0OIL BASED21.08.198536971.5035.010.0OIL BASED22.05.198537531.9452.010.0OIL BASED09.08.198538781.5639.05.7OIL BASED23.05.198539201.9456.014.0OIL BASED17.08.198540461.6248.06.7OIL BASED24.05.198540701.6455.011.9OIL BASED28.05.198540951.6653.019.0OIL BASED31.05.198541101.6573.011.4OIL BASED03.06.198541101.6561.09.5OIL BASED28.05.198541101.6565.09.0OIL BASED28.05.198541101.6561.09.5OIL BASED28.05.198541101.6661.09.0OIL BASED28.05.198541101.6661.020.0OIL BASED29.05.198541101.6565.09.0OIL BASED28.05.198541101.6661.09.0OIL BASED28.05.198541101.6661.020.0OIL BASED29.05.198541101.6653.09.1OIL BASED03.06.198541101.6573.011.4OIL BASED03.06.198541101.6653.09.1OIL BASED03.06.198541301.6667.011.5OIL BASED03.06.198541961.6662.010.5OIL BASED03.06.198542691.8092.017.2OIL BASED04.06.198543331.8182.014.0OIL BASED05.06.198543531.8382.014.5OIL BASED06.06.198543531.8370.013.4OIL BASED10.06.198543531.8370.015.0OIL BASED10.06.198543531.8376.016.0OIL BASED10.06.198543531.8370.013.4OIL BASED10.06.198543531.8370.015.0OIL BASED10.06.198543531.8376.016.0OIL BASED10.06.198543561.8361.013.0OIL BASED10.06.198544081.8360.013.0OIL BASED11.06.198544511.8258.026.0OIL BASED13.06.198544791.8662.014.0OIL BASED13.06.198544971.8754.013.0OIL BASED16.06.198545131.9364.015.0OIL BASED16.06.198545141.9254.013.0OIL BASED18.06.198545141.9258.026.0OIL BASED17.06.198545141.9254.013.0OIL BASED18.06.198545141.9555.013.0OIL BASED08.07.198545151.9455.012.0OIL BASED08.07.198545151.9279.018.2OIL BASED26.06.198545151.9260.012.4OIL BASED27.06.198545151.9266.014.3OIL BASED28.06.198545150.0066.0162.2oil based28.06.198545151.9255.014.3OIL BASED28.06.198545151.9256.014.4OIL BASED01.07.198545151.9253.013.4OIL BASED02.07.198545151.9258.012.0OIL BASED21.06.198545151.9258.012.0OIL BASED21.06.198545151.9257.011.0OIL BASED19.06.198545151.9279.018.2OIL BASED26.06.198545151.9260.012.4OIL BASED27.06.198545151.9266.0162.2OIL BASED28.06.198545151.9255.014.3OIL BASED28.06.198545151.9253.013.4OIL BASED02.07.198545151.9455.012.0OIL BASED08.07.198545151.9253.012.0OIL BASED04.07.198545151.9266.014.3OIL BASED28.06.198545151.9256.014.4OIL BASED01.07.198545151.9253.012.0OIL BASED04.07.198545161.9272.013.0OIL BASED24.06.198545161.9257.015.0OIL BASED03.07.198545161.9276.014.0OIL BASED24.06.198545161.9276.014.0OIL BASED24.06.198545161.9275.014.0OIL BASED24.06.198545161.9271.014.0OIL BASED25.06.198545161.9261.013.0OIL BASED24.06.198545161.9275.014.0OIL BASED24.06.198545161.9272.013.0OIL BASED24.06.198545161.9271.014.0OIL BASED25.06.198545161.9257.015.0OIL BASED03.07.198545241.9454.012.0OIL BASED10.07.198545291.9453.012.0OIL BASED08.07.198545331.9251.011.0OIL BASED19.08.198545331.9256.014.0OIL BASED19.08.198545331.9454.012.0OIL BASED08.08.198545331.9452.011.0OIL BASED08.08.198545331.9451.011.0OIL BASED12.08.198545331.9447.09.0OIL BASED15.07.198545331.9444.09.0OIL BASED15.07.198545331.9452.011.0OIL BASED08.08.198545331.9451.011.0OIL BASED13.08.198545331.9447.09.0OIL BASED15.07.198545331.9444.09.0OIL BASED15.07.198545331.9454.012.0OIL BASED08.08.198545331.9452.011.0OIL BASED13.08.198545331.9451.011.0OIL BASED12.08.198545331.9454.010.0OIL BASED15.07.198545331.9452.011.0OIL BASED13.08.198545331.9451.011.0OIL BASED13.08.198545331.9456.014.0OIL BASED19.08.198545341.9453.024.0OIL BASED08.07.198545341.9455.013.0OIL BASED09.07.198545341.9454.012.0OIL BASED11.07.198545341.9452.011.0OIL BASED15.07.198545341.9454.012.0OIL BASED11.07.198545341.9452.011.0OIL BASED15.07.198545341.9455.013.0OIL BASED09.07.198545381.9445.09.0OIL BASED16.07.198545391.9447.010.0OIL BASED17.07.198545971.9447.09.0OIL BASED18.07.198546231.9451.010.0OIL BASED20.07.198546331.9450.010.0OIL BASED20.07.198546751.9451.09.0OIL BASED20.07.198546961.9452.09.0OIL BASED22.07.198547021.9450.08.5OIL BASED23.07.198547341.9453.020.0OIL BASED24.07.198547501.9452.015.0OIL BASED25.07.198547751.9450.010.0OIL BASED28.07.198548201.9450.018.0OIL BASED29.07.198548861.9449.08.0OIL BASED29.07.198549031.9449.08.5OIL BASED29.07.198549371.9450.08.5OIL BASED30.07.198549371.9450.08.5OIL BASED31.07.198549371.9450.08.5OIL BASED01.08.198549371.9450.08.5OIL BASED05.08.198549371.9451.08.5OIL BASED05.08.198549371.9452.09.5OIL BASED05.08.198549371.9452.09.5OIL BASED07.08.198549371.9452.09.5OIL BASED08.08.198549371.9451.011.0OIL BASED15.08.198549371.9451.011.0OIL BASED15.08.198549371.9450.08.5OIL BASED31.07.198549371.9450.08.5OIL BASED01.08.198549371.9450.08.5OIL BASED05.08.198549371.9451.08.5OIL BASED05.08.198549371.9452.09.5OIL BASED05.08.198549371.9452.09.5OIL BASED07.08.198549371.9452.09.5OIL BASED08.08.1985