2/7-16
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General information
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Wellbore history
GeneralWildcat well 2/7-16 was drilled on a structure on a broad terrace to the south of Edda field and with a geological environment similar to Edda. The primary objective was to test the potential for hydrocarbon production from Danian and Late Cretaceous Limestones on a low relief structural closure. Secondary objective was a possible stratigraphic trap potential in Early Cretaceous sandstones.Operations and resultsWell 2/7-16 was spudded with the semi-submersible installation Nortrym on 20 March 1980 and drilled to TD at 4818 m in the Early Cretaceous Ågard Formation. The well was drilled with Seawater/Native Solids mud down to the 13 3/8" casing point at 1523 m, with Seawater/Lignosulphonate from 1523 m to the 9 5/8" casing point at 3794 m, and with Calcium chloride/Sodium chloride XC polymer mud from 3794 m to TD.Hydrocarbon shows were encountered in the Danian and Upper Cretaceous limestone. The porosity was poorly developed and testing verified the zones to be non-productive. Early Cretaceous had shows in limestones, claystones, shales, and marls, but no sandstones were found.Thirteen conventional cores were cut continuously from 3182 m to 3402 m in the Ekofisk and Tor Formations Formations. Twenty-five RFT measurements were attempted in the gross interval 3823.8 - 4783.6 m. A fluid sample was obtained at 4587.9 m. It contained 50 ml formation water and 39 cubic feet (1.1 Sm3) gas.The well was permanently abandoned on 12 July 1980 as a dry well with shows.TestingTwo drill stem tests were conducted. DST 1 at 3279.7 to 3288.8 m in the Tor Formation produced 660 barrels (105 m3) of water /day, with traces of oil and gas. DST 2 from the intervals 3193.1 - 3199.8 and 3201.4 - 3215.4 m in the Ekofisk Formation produced 28.8 barrels (4.6 m3) water /day with no oil or gas before acid treatment. Well died completely after acid, with only a very weak flow of acid gas. -
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]637.004817.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom110441.010501.0[ft ]210501.010558.9[ft ]310560.010619.6[ft ]410621.010661.1[ft ]510681.010729.0[ft ]610730.010788.0[ft ]710790.010841.6[ft ]810843.010901.6[ft ]910903.010908.6[ft ]1010921.010981.0[ft ]1110981.011038.6[ft ]1211041.011101.0[ft ]1311101.011161.0[ft ]1411163.011172.0[ft ]Cores at the Norwegian Offshore Directorate Total core sample length [m]209.1Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit961714299529953012308031503182318232643500396739754271427143594533 -
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]pdf31.79pdf3.09 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0325432630.02.0316831900.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.0 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DLL BHC GR SP37934816FDC CNL GR CAL28344817HDT15243805ISF BHC GR CAL SP1643814ML MLL37914817VELOCITY6254818 -
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 typeCONDUCTOR30139.036140.00.00LOTSURF.COND.20587.026605.01.53LOTINTERM.13 3/81497.017 1/21513.02.04LOTINTERM.9 5/83769.012 1/43788.02.09LOTLINER74818.08 1/24818.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured6271.1380.0WATER BASED12.07.198012011.2548.0WATER BASED12.07.198015381.3734.0WATER BASED12.07.198023061.7358.0WATER BASED12.07.198025611.7247.0WATER BASED12.07.198028241.7262.0WATER BASED12.07.198032011.7060.0WATER BASED12.07.198032201.6956.0WATER BASED12.07.198034321.4958.0WATER BASED12.07.198041151.6465.0WATER BASED12.07.198046741.7855.0WATER BASED12.07.198048171.8847.0WATER BASED12.07.1980 -
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