25/4-4
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General information
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Wellbore history
GeneralWell 25/4-4 was drilled on the NW flank of the structure of the Heimdal structure, north of well 2 5/4-1. The objective was to appraise the Heimdal reservoir extension, to assess its characteristics, and to sample it.Operations and resultsAppraisal well 25/4-4 was spudded with the semi-submersible installation Odin Drill on 16 May 1975 and drilled to TD at 2681 m in the Early Paleocene Våle Formation.The well encountered 323 m of Heimdal sands with top at 2133 m, and 157 m of Ty sands at 2517 m. The Heimdal Formation consisted of sand with shale interbeds. The sand was generally clean, with a few sand-shale laminae. It was hydrocarbon bearing with a gas/oil contact at 2172 m, and the oil/water contact at 2175 m in accordance with what was expected. The Ty sand was water bearing.Four cores were cut from 2142 m to 2170 m in the Heimdal Formation. The recovery varied from 0.5 m to a full 9 m barrel. Poor recovery was mainly due to very unconsolidated sand. Three Formation Interval Tests were conducted. FIT1 sampled oil from 2173.5 m, FIT2 sampled gas from 2171.4 m, and FIT3 sampled salt water from 2190 m.The well was permanently abandoned on 7 July as a gas and oil appraisal.TestingA drill stem test was conducted from the interval 2134 m to 2143 m in gas zone of the Heimdal Formation. It produced 676300 Sm3 gas and 95.8 Sm3 condensate/day. -
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]220.002680.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12142.02151.0[m ]32160.02161.0[m ]42167.02170.0[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]13.0Cores 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 typeCONDUCTOR30191.036194.00.00LOTCONDUCTOR18 5/8201.026202.00.00LOTSURF.COND.13 3/8458.017 1/2460.00.00LOTINTERM.9 5/82013.012 1/42014.00.00LOTOPEN HOLE2681.08 1/22681.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.0213421430.0Drill 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 GR1412016BHC GR20122683DLL PS20122400FDC CNL GR CAL20122681HDT20122682IES4592016IES20122682MLL ML CAL20122400TEMP4951986 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit141774979111120122012204520902133245625172674 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.29 -
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]pdf0.89pdf1.14 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured1751.05seawater2041.06seawater4731.1372.030.0seawater13941.1147.0seawater20251.1564.0seawater22081.2155.0seawater -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory2180.0[m]DCRRI2185.0[m]DCRRI2235.0[m]DCRRI2240.0[m]DCRRI2245.0[m]DCRRI2270.0[m]DCRRI