16/11-2
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General information
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Wellbore history
GeneralThe Anchovy (16/11-2) well was drilled on a semi-domal structure, about 5 miles long and 4 miles wide situated in the Danish-Norwegian Basin. It was estimated that at Paleocene depth there would be 12 square miles of closure with 150 m vertical relief and at Jurassic depth, 9 square miles of closure with 370 m vertical relief. The principal objective horizons were the Jurassic and Paleocene sands.Operations and resultsWildcat well 16/11-2 was spudded with the semi-submersible installation Ocean Viking and drilled to TD at 2378 m in Late Permian Zechstein salt.No Paleocene sands were encountered. As expected the Danian Chalk section was missing in the well. The Upper Cretaceous Limestone was tight with no shows. The Jurassic sand top was encountered at 2202 m with the main sand development beginning at 2207 m. The net sand thickness was 35 m, but on testing was found to be tight and unproductive. The total Jurassic section was about 244 m thinner than anticipated. The Triassic was missing. An 11.5 m Dolomite section was developed from 2250 m to 2261.5 m at the top of the Permian succession. This was also tested, but found to be tight and unproductive. Thus the well was terminated in the Zechstein higher than planned. Except for the reduced Jurassic sequence and absence of Triassic sediments causing the higher position of the Zechstein, the structure and stratigraphy were as predicted in the prognosis. Geochemical analyses of shales from the Late Jurassic Tau Formation proved excellent source potential, but the kerogen is immature to marginally mature in the well location. No cores were cut. The well was permanently abandoned as a dry well on 23 July 1973.TestingTwo intervals in the Sandnes Formation were perforated and tested, 2261 m to 2251 m and 2242 m to 2231 m. Both intervals were found tight and unproductive and no hydrocarbons were produced during the tests. -
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]1405.132359.15 -
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 typeCONDUCTOR30133.036202.00.00LOTSURF.COND.20449.026459.00.00LOTINTERM.13 3/81387.017 1/21402.00.00LOTINTERM.9 5/82378.012 1/42378.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]2.0225122620.03.0223122420.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]2.03.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]2.03.0 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BHC4491399BHC C13872374CBL13172327CDM13882377CDM AP13882377CDM PP13882377CDR13882377GR70449IES4491401IES13882376LL-918902372 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit97912931153215321573160616401656165616971819189718971917196321272127220222022269 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.22 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf0.31pdf4.08 -
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]pdf10.70 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1311.05seawater4571.06seawater14021.1445.0Gyp-seawate36571.3150.0seawater