2/7-24
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General information
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Wellbore history
GeneralWell 2/7-24 was drilled on the west Valhall Prospect, a Late Jurassic structure located in the Feda Graben on the west side of the Central Trough near the Skrubbe Fault. The main objective was the Eldfisk Formation sandstones, a mass flow deposit located on the east side of the fault. A secondary objective was sandstones associated with a seismic horizon called the Intra Volgian Marker.Operations and resultsWildcat well 2/7-24 was spudded by the semi submersible rig Ross Isle 7 November 1990 and drilled to TD at 5023 in the Late Jurassic Farsund Formation. No shallow gas was encountered in this well. At ca 3050 m, in the 5 7/8" hole section, the inclination started to increase to a maximum of 20 deg where after the inclination decreased to 12,5 deg at TD. The well was hampered by bad weather, malfunction of BOP, hole problems with loss of mud, and problems with running logging equipment properly. The well was drilled with sea water and hi-vis pills down to 465 m, with ester-based Petrofree mud from 465 m to 3042 m, and with oil based mud from 3042 m to 3388 m. Below 3388 m the mud was switched from oil based to water based in an effort to reduce the mud losses. Water based mud was used down to TD.The base Cretaceous unconformity was encountered at 3195 m. The well penetrated 122 m of Mandal Formation and continued through 1706 m of Farsund Formation without reaching its base. Hence an 1828 m thick Late Jurassic section was penetrated, a record at the time of drilling. The Late Jurassic lithology was primarily mudstone with subordinate amounts of thinly bedded sandstone and limestone. The primary objective was encountered approximately at 4069 m, 174 m higher than prognosed. No reservoir quality clastic mass flow deposit was present. The well penetrated some thin sandstones in the interval 4352 m to 4520 m, ca 260 m below the Intra Late Jurassic Marker, but they were discontinuous and not of reservoir quality. The core from this section was bleeding gas throughout with dark brown oil bleeding from a sandstone bed in vicinity of a sandstone bed at 4491.2 m. Mudstones.One conventional core was cut in the Farsund Formation from 4483.9 m to 4504.3 m. A total of 84 sidewall cores were attempted, and 35 cores were recovered. No wire line fluid samples were taken.The well was permanently abandoned on 13 April 1991 as a dry well.TestingNo drill stem test was performed. -
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]466.004877.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom114711.014767.2[ft ]Cores at the Norwegian Offshore Directorate Total core sample length [m]17.1Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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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 typeCONDUCTOR30127.036128.00.00LOTINTERM.20458.026464.00.00LOTINTERM.13 3/81525.017 1/21531.01.93LOTINTERM.9 5/83041.012 1/43044.02.09LOTLINER73918.08 1/23923.02.15LOTOPEN HOLE5023.05 7/85023.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]DIL BHC LDL CNL NGL GR AMS39225020DIL SLS GR CAL AMD921518DITE LSS CAL GR AMS30443304DITE SLS GR CAL AMS15273047DLL GPIT MSFL BHC GR39224567DLL MSFL BHC GR AMS30443922FMS GR AMS30443927LDL CNL GR AMS15273049LDL CNL NGL AMS30443925MWD GR1271525OBDT GR AMS26513049RFT GR30843289RFT GR32893773SHDT NGL AMS39184949VSP10663916VSP38864937 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit92159226742674268127092734273427442966297029942994301730813109319531953317 -
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]pdf2.68pdf26.28pdf3.35 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3430.19WATER BASED3510.19WATER BASED4651.2017.0WATER BASED14481.3734.0WATER BASED15321.4537.0WATER BASED17381.4739.0WATER BASED21091.6750.0WATER BASED25651.6739.0WATER BASED28881.6754.0WATER BASED29781.7054.0WATER BASED30491.8555.0WATER BASED30861.8651.0WATER BASED31631.8851.0WATER BASED31931.9355.0WATER BASED32091.9151.0WATER BASED32681.9151.0WATER BASED32711.9154.0WATER BASED32981.9137.0WATER BASED33501.9944.0WATER BASED33511.9945.0WATER BASED33641.9338.0WATER BASED33781.9378.0WATER BASED33881.9152.0WATER BASED34151.9349.0WATER BASED34241.9540.0WATER BASED35491.9740.0WATER BASED35751.9735.0WATER BASED36401.9722.0WATER BASED36781.9919.0WATER BASED37741.9914.0WATER BASED38571.9916.0WATER BASED39242.0020.0WATER BASED39601.9317.0WATER BASED39701.9317.0WATER BASED40161.9319.0WATER BASED40781.9319.0WATER BASED41381.9320.0WATER BASED42161.9319.0WATER BASED42701.9319.0WATER BASED42931.9318.0WATER BASED44011.9318.0WATER BASED45011.9322.0WATER BASED45051.9319.0WATER BASED45581.9319.0WATER BASED46061.9319.0WATER BASED46681.9519.0WATER BASED47061.9522.0WATER BASED47291.9520.0WATER BASED48181.9519.0WATER BASED48661.9521.0WATER BASED48881.9720.0WATER BASED49371.9520.0WATER BASED49791.9721.0WATER BASED50231.7414.0WATER BASED