6405/7-1
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General information
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Wellbore history
GeneralWildcat well 6405/7-1 was drilled in 1206 m water depth on the Grip High, ca 75 km due north of the Ormen Lange Field in the Norwegian Sea. The primary target was the Nise Formation of Campanian age. Secondary targets were the Lysing Formation of Coniacian age and a Danian lead, the Egga Member Equivalent. In addition, understanding of a mapped flat event was a main objective for this well.Operations and resultsWell 6405/7-1 was spudded with the dynamically positioned drill ship West Navigator on 21 June 2003 and drilled to TD at 4300 m in the Late Cretaceous Lysing Formation. In the 12 1/4" several incidents with high gas levels and also gain in the active system were recorded and responded to. In the end the mud weight had been increased from initially 1,33 g/cm3 when drilling to core point at 2816 m, to 1,42 g/cm3 prior to pulling out of the hole. The decision was made to plug back the 12 1/4" hole and initiate a technical side track (T2) with an 11 3/4" liner set above top of the reservoir. When the well was at TD and the discovery confirmed quality MWD data from the 26" section interval had to be collected. To obtain this a new 8 1/2" hole was drilled 15 m from the original hole from seafloor to 1920 m using LWD in one derrick, while performing wire line logging in the other. The well was drilled with seawater and hi-vis pills down to 1910 m and with Glydril DW (water based KCl/NaCl/Glycol/MEG/polymer) from 1910 m to TD. The post-TD 8 1/2" hole for MWD logging was drilled with seawater and hi-vis sweeps.The primary target, the Nise Formation, 2757 m to 2816 m in well 6405/7-1 and 2760.6 m to 2960 m in 6405/7-1T2, consists of layered/laminated and bioturbated claystones, siltstones and sandstones with poor reservoir quality. The Nise formation proved to be oil-bearing from the top at 2760.5 m and down to 2823 m. However, good oil shows are also described below this depth, to the base of the deepest core at 2881 m and on SWCs down to 2892 m. Oil samples were collected from wire line testing tool at 2763 m, 2770.5 m and 2828 m. Water samples were taken with wire line testing tool at 2828 m and 2850 m. The secondary target, the Lysing Formation, was encountered at 3665 m. The base of the Lysing Formation was not seen. The reservoir properties were poor. It consisted of highly bioturbated, very fine to fine grained sandstones, siltstones and claystones. Quartz cementation is common. The Lysing sands were water wet. No samples were taken due to tight formation. Five cores were cut in the interval 2754 m - 2881 m and two cores were cut in the interval 3751 m to 3784 m. All cores were cut in the T2 track.The well was permanently abandoned on 15 October 2003 as an oil discoveryTestingA drill stem test was performed from the interval 2758 m - 2811.7 m. The production rate from the test was 40 m3 oil/day, with a GOR of 175 m3/m3. Stock tank oil density was measured to 868 kg/m3 (31 deg API). Geochemical analyses show that the oil contain relatively low-mature biomarkers from a post Jurassic source rock, but there may be several populations of oils in the reservoir. -
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]1920.004300.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom12754.02764.0[m ]22781.02806.6[m ]32808.02831.6[m ]42835.02861.5[m ]52862.02869.4[m ]63751.03756.0[m ]73757.03783.1[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]124.2Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableDST2811.702758.00OIL02.10.2003 - 21:00YES -
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 typeSURF.COND.301310.0361310.00.00LOTINTERM.201900.0261910.01.33LOTINTERM.13 3/82417.0172425.01.42LOTINTERM.11 3/42741.0142741.01.60LOTINTERM.9 5/83187.012 1/43200.01.70LOTOPEN HOLE4300.08 1/24300.00.00LOT -
Drill stem tests (DST)
Drill stem tests (DST) Test numberFrom depth MD
[m]To depth MD
[m]Choke size
[mm]1.02758281212.7Drill stem tests (DST) Test numberFinal shut-in pressure
[MPa]Final flow pressure
[MPa]Bottom hole pressure
[MPa]Downhole temperature
[°C]1.072Drill stem tests (DST) Test numberOil
[Sm3/day]Gas
[Sm3/day]Oil density
[g/cm3]Gas grav. rel.airGOR
[m3/m3]1.0407000175 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]MRIL GR27503112MRIL GR32004300MWD LWD - DIR RES GR13122425MWD LWD - DIR RES GR24404300MWD LWD - DIR RES GR NUC.SON12421920MWD LWD - DIR RES GR NUCL.SON24282816PFC GR EZSV BRIDGE PLUG26502840RCI GR27542886RCI GR27603158RCI GR27632824RCI GR32274195RCI GR37573757RCOR GR27653174RCOR GR40994293SBT CCL GR21803185STAR GR27363197TTRM DSL CN ZDL DLL31874300TTRM DSL CN ZDL XMAC DLL MLL32002625TTRM DSL ORIT XMAC DLL MLL19002416TTRM DSL ORIT XMACII.HDLL MLL31874300VSP18854295 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit1242124219351935250625062602266426642757296036653665 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.58 -
Geochemical information
Geochemical information Document nameDocument formatDocument size [MB]pdf6.05 -
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].pdf0.99.PDF6.81 -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured14211.03SW / BENTONITE 719101.35SEAWATER/CMC20701.2320.0GLYDRIL DW 3724251.2318.0GLYDRIL DW 3727421.3718.0GLYDRIL DW 3728051.4519.0GLYDRIL DW 3728161.3520.0GLYDRIL DW 3728621.4522.0GLYDRIL DW 3732001.4519.0GLYDRIL DW 3734111.4121.0GLYDRIL DW 3737641.4121.0GLYDRIL DW 3740621.4121.0GLYDRIL DW 3743001.4122.0GLYDRIL DW 37 -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit2840.10[m ]2762.60[m ]