25/1-3
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General information
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Wellbore history
GeneralWell 25/1-3 was drilled to appraise the eastward extension of the 25/1-1 Frigg Discovery on the Frigg Ridge in the North Sea. The primary objective was to test the Eocene sandstones that were gas bearing in well 25/1-1.Operations and resultsAppraisal well 25/1-3 was spudded with the semi-submersible installation Pentagone 81 on 14 November 1971 and drilled to TD at 2872 m in the Late Cretaceous Shetland Group. The well was drilled with seawater down to 405 m and with a seawater/LFC mud from 405 m to TD.The target Eocene sandstones (Frigg Formation) was penetrated at 1952 m. The gross thickness was 217 m and the N/G was 0.82 with porosities ranging from 28 to 33%. It was gas bearing down to the GOC at 1973 m and oil bearing down to the OWC at 1982.5 m. Good oil shows on cores were recorded throughout the hydrocarbon-bearing reservoir. Weaker oil shows on cores were described ("fluo but salty taste") below the OWC.Three cores were cut from 1951 to 2005 m in the Frigg reservoir. Total recovery for these three cores was 42.25 m (78.2% recovery). A fourth core was cut from 2563 to 2568 m with 50% recovery. FIT fluid samples were attempted at 2550.5 m and 2576.3 m but only mud and filtrate was recovered.The well was permanently abandoned on 27 January 1972 as an oil and gas appraisal wellTestingSix drill stem tests were conducted.DST 1, 2 and 3 tested the interval 1985 to 1987 m. All three tests produced water.DST 4 and 5 tested the interval 1978 to 1980 m. DST 4 produced 21.5 Sm3 oil/day and DST 5 produced 70 Sm3 oil/day. The maximum temperature in these tests was reported to be 63 °C.DST 6 tested the interval 1976 to 1980 m and produced in the final flow; through a 24/64" choke an average of 14400 Sm3 gas and 136 Sm3 oil /day. The corresponding GOR is 106 Sm3/Sm3. -
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]420.002870.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11951.01965.3[m ]21969.01982.9[m ]31991.12005.0[m ]42563.02565.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]44.6Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1775.0[m]DC1795.0[m]DC1815.0[m]DC1835.0[m]DC1855.0[m]DC1875.0[m]DC1895.0[m]DC1925.0[m]DC1930.0[m]DC1935.0[m]DC1945.0[m]DC2025.0[m]DC2045.0[m]DC2065.0[m]DC2085.0[m]DC2105.0[m]DC2125.0[m]DC2145.0[m]DC2160.0[m]DC2180.0[m]DC2200.0[m]DC2220.0[m]DC2245.0[m]DC2265.0[m]DC2285.0[m]DC2305.0[m]DC2325.0[m]DC2345.0[m]DC2365.0[m]DC2385.0[m]DC2405.0[m]DC2425.0[m]DC2448.0[m]DC2476.0[m]DC2496.0[m]DC2516.0[m]DC2536.0[m]DC2552.0[m]DC2564.0[m]CIGS -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit12983519522244224422722289249227112734 -
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]pdf1.43pdf0.51 -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0198519870.02.0198519870.03.0198519870.04.0197819800.05.0197819800.06.0197619800.0Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.02.03.04.05.06.0Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.02.03.04.0215.0706.084110 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]BHC1502869CBL15002011CDM AP18832873DL18822869FDC18822874IES4072869ML MLL18832872SNP18822874SRS4072873 -
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 typeCONDUCTOR30165.036165.00.00INTERM.13 3/8405.017 1/2415.00.00SURF.COND.9 5/81880.012 1/41886.00.00LINER72036.08 1/22872.00.00 -
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