25/2-2
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General information
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Wellbore history
GeneralWell 25/2-2 is located east of the Frigg Field and south of the Frigg Øst Field, on the top of an E-W trending structure. The well was drilled to appraise the 25/2-1 Øst Frigg Discovery made in September 1973. The main target was lower Eocene sands where seismic sections displayed a bright spot in the western part of the closure just below the Frigg sand horizon. Secondary targets were Danian and Maastrichtian sands.Operations and resultsAppraisal well 25/2-2 was spudded with the semi-submersible installation Deepsea Driller on 31 May 1974 and drilled to TD at 2740 m in the Late Cretaceous Shetland Group.Top Early Eocene sands (Frigg Formation) were encountered at 1949 m, 23 m lower than prognosed. The Hermod Formation came in at 2269 m while Danian sand (Ty Formation) was encountered at 2563 m and chalky limestone (Shetland Group) at 2703 m. Hermod and Ty were water wet. An increase in C1 and C2 at around 1950 m during drilling marked the top of the Frigg Formation reservoir. From electrical logs, FIT's and the DST Gas/oil and oil/water contacts were set at 1964.2 m and 1974.4 m, respectively. Three cores were cut from 1991 to 2012.5 m. The cores consisted almost entirely of sand with only some thin interbeds of silt in core number 2. Down to 2011 m the cored sands were brown coloured from oil stain, and direct fluorescence and cuts were very strong. No shows were observed from 2011 m to 2015.5 m in the base 1.5 m of core number 3. The DST carried out in the cored interval produced only water. Weak shows were recorded in the Ty Formation sands. Two FIT's at 1952 and 1968.2 in the Frigg Formation reservoir sampled gas and oil and recorded formation temperatures of 57.6 °C and 57.9 °C, respectively.The well was permanently abandoned on 11 July 1974 as an oil and gas appraisal.TestingDST 1 carried out from 1983 to 1996 m produced 5.1 m3 of salt water (53 g/1). -
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]460.002740.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11991.02001.5[m ]22002.02004.0[m ]32004.02012.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]21.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
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 typeCONDUCTOR30165.036166.00.00LOTSURF.COND.13 3/8442.017 1/2444.00.00LOTINTERM.9 5/81912.012 1/41914.00.00LOTOPEN HOLE2740.08 1/22740.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0198319960.0Drill 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]1.0 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BHC GR1201917BHC GR19102720CBL13401910CNT FDC19102097CNT FDC19102721DLL19102720HDT19102721IES4401917IES19102721IES19102097ML MLL19102721VELOCITY00 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit129887194921962196226322692363256327032703 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.31 -
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]pdf15.49pdf1.31pdf0.17pdf1.04pdf6.72pdf6.72pdf0.45pdf0.90pdf0.49pdf3.66pdf0.47pdf0.17pdf0.50pdf2.26pdf0.35 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured9041.1343.0water based19231.3352.0water based22741.2355.0water based26811.2448.0water based27401.2348.0water based