6406/12-G-1 H
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Generell informasjon
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Brønnhistorie
GeneralWell 6406/12-G-1 H is an extension of an observation well for the 6406/12-3 A (Bue) oil discovery. The well was drilled on the Fenja field on the southern end of the Halten Terrace in the Norwegian Sea. The primary objective of the exploration section was to confirm oil in Rogn Formation sandstones in the north-eastern part of the Fenja Field, and thereby reduce uncertainty in the resource estimates. Secondary objective was to test Intra Melke Formation sandstones.Operations and resultsA 9 7/8" pilot hole designated 6406-12-U-1 was drilled down to 1240 m to check for shallow gas. No shallow gas was detected.Well 6406/12-G-1 H was spudded with the semi-submersible installation West Phoenix on 3 May 2020 and drilled to TD at 4235 m (3734 m TVD) in Middle Jurassic (Callovian) claystone belonging to the Melke Formation. The well was drilled in 67.7 days vs. the planned 38.4 days with 13 days (19%) WOW and 8.4 days (12.3%) NPT. Main source of WOW was related to running the 20" casing and while running the 13-5/8" casing. NPT was mainly due to loosing and fishing of Wireline tool string, as well as reduced crew availability due to Covid-19 outbreak on the rig. The well was drilled with seawater and hi-vis pills down to 1244 m, with RheGuard oil-based mud from 1244 to 2477 m, and with Exploradrill oil-based mud from 2477 to TD.Well 6406/12-G-1 H did not encounter reservoir rocks in the primary Bue/Rogn Formation target. The well did however encounter moveable hydrocarbons in Intra-Melke Formation sandstones just below a thin Spekk Formation. These sandstones were penetrated from 3861 to 3956 m (3376.6 to 3462.6 m TVD). The best sands were in the upper part with progressively poorer sands and increasing claystone interbeds downwards. Petrophysical analysis indicated pay zones down to 3872 m (3386.6 m TVD). A possible Oil-Down-To (ODT) is indicated at 3955.2m MD (3462.5 m TVD) based on weakening fluorescence in core three. The hydrocarbons in the Intra Melke Formation sandstones were in in a different pressure regime compared to both the Pil (intra-Melke Formation sandstones) and the Bue (Rogn Formation) discoveries.Three cores were cut. Core one was cut from 3868 to 3871.3 m with 51.5% recovery. The core jammed of in what appeared to be a coal bed. Core two was cut from 3871.3 to 3925.9 m with 100% recovery. Core three was cut from 3925.9 to 3962.3 m with 99.4% recovery. MDT oil samples were taken at 3865.8 m (3381.1 m TVD).The well was permanently abandoned on 24 October 2020 as an oil discovery.TestingNo drill stem test was performed. -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13868.03869.7[m ]23871.33926.1[m ]33926.03962.1[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]92.6Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet3613611142122512251966196620632261226123602545325032503823385938593861 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]MDT38883899MWD LWD - TELE322450MWD LWD - TELE ARCVIS4301244MWD LWD - TELE EC GV ST SV SS PV24704235MWD LWD - TELE SON ARCVIS12442470QG MDT37003955 -
Foringsrør og formasjonsstyrketester
Foringsrør og formasjonsstyrketester Type utforingUtforing diam.
[tommer]Utforing dybde
[m]Brønnbane diam.
[tommer]Brønnbane dyp
[m]LOT/FIT slam eqv.
[g/cm3]Type formasjonstestCONDUCTOR30422.836430.00.00INTERM.201237.3261244.01.63FITINTERM.13 3/82470.017 1/22477.41.78FITOPEN HOLE4235.08 1/24235.00.00 -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling4241.03Water12441.509.0Water17001.5514.3Oil24771.5811.4Oil26551.607.6Oil38681.617.6Oil42351.6010.0Oil