6406/12-3 A
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General information
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Wellbore history
GeneralThe 6406/12-3 S, 6406/12-3 A, and 6406/12-3 B wellbores were drilled in concert on the Pil and Bue prospects in the southern end of the Halten Terrace in the Norwegian Sea. The S and B wells were planned to target the Pil and the Bue prospects, respectively. Well 6406/12-3 S found gas over oil in Intra Melke Formation sandstones in the Pil prospect. This result led to the decision within the partnership to drill an appraisal of the discovery. The appraisal well was designated 6406/12-3 B, which confirmed oil in Melke Formation Sandstones in pressure communication with the primary well 6406/12-3 S. The last sidetrack well, 6406/12-3 A, was designed to test the Bue prospect and to evaluate fluid contacts and connectivity with the Pil discovery.Operations and resultsWildcat well 6406/12-3 A was kicked off from 1259 m in well 6406/12-3 S on 26 April 2014. It was drilled with the semi-submersible installation Transocean Arctic and drilled to 2355 m in the Springar Formation. Once the 13 3/8" casing was cemented on 2 May 2014 the well was suspended while 6406/12-3 B well operations were carried out. After that well bore was plugged and abandoned the 6406/12-3 A sidetrack was resumed on 11 June 2014 and drilled to TD at 4315 m in Late Jurassic (Callovian) sediments belonging to the Melke Formation. No significant problem was encountered in the operations. The well was drilled with XP-07 oil based mud from kick-off to TD.The 6406/12-3 A well entered the Jurassic reservoir rocks approximately 900 m to the northwest of the 6406/12-3 B Pil reservoir entry point. The well encountered Spekk Formation claystones on either side of a Rogn Formation sandstone reservoir and below this is a Melke Formation heterolithic package. Top Rogn Formation was at 4053 m (3421 m TVD) with top reservoir sands at 4059 m (3426 m TVD). The Rogn reservoir was of good to very good quality and contained an 18 m oil column with an OWC at 4083 m (3444 m TVD). No gas cap was anticipated or present. Data including the oil water contact position and oil type indicates the 6406/12-3 A discovery is separate from 6406/12-3 S discovery.A total of 93 m of core was cut from 4085 m in the Rogn Formation to 4178 m in the Intra Melke Formation sandstone. The overall core recovery was close to 100%. RCX oil samples were taken at 4072.53m.The well was permanently abandoned on 16 July 2014 as an oil discovery 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]1260.004356.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom14085.04142.5[m ]24142.54167.7[m ]34168.04177.5[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]92.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit348348109112301230196119612087233223322678371537154019404140414053411441244180 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]IAC39934353LWD - AT23394085LWD - AT LT41174356LWD - OT BCPM23222330LWD - OT II12462355RCX39934180RCX PS00RCX SP40734073SBT CBL34474006SGR MREX FLEX40234227SLAM 3DEX39934353VSP14264376 -
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 typeCONDUCTOR30415.036418.00.00SURF.COND.201239.0261246.01.70FITINTERM.13 3/82348.017 1/22355.01.92FITPROD.9 5/83998.012 1/44005.01.85FITOPEN HOLE4356.08 1/24356.00.00 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured12741.4925.0Yellow XP-0717651.5326.0Yellow XP-0718951.6136.0Yellow XP-0723301.6147.0XP-0723551.6139.0Yellow XP-0725221.6150.0XP-0740051.6246.0XP-0740801.6243.0Yellow XP-0740851.6244.0XP-0741371.6244.0Yellow XP-0741681.6246.0XP-0741771.6243.0Yellow XP-0743561.6352.0Yellow XP-07