Wellbore: 6405/7-1 - Factpages - Norwegian Offshore Directorate

General information

General information
Attribute	Value
Wellbore name Official name of wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.	6405/7-1
Type Wellbore type. Legal values: EXPLORATION, DEVELOPMENT, OTHER (see 'Purpose' for more information)	EXPLORATION
Purpose Final classification of the wellbore. Legal values for exploration wellbores: WILDCAT, APPRAISAL, WILDCAT-CCS, APPRAISAL-CCS. Legal values for development wellbores: OBSERVATION, PRODUCTION, INJECTION, INJECTION-CCS, OBSERVATION-CCS. Legal values for other wellbores: SOIL DRILLING (drilling in connection with track surveys and other subsurface surveys to investigate the soil conditions prior to placement of facilities), SHALLOW GAS (drilling to investigate shallow gas before the first 'real' drilling on the location), PILOT (drilling to investigate the geology and fluid connectors for location of the main wellbore), SCIENTIFIC (drilling according to Law of Scientific research and exploration), STRATIGRAPHIC (driling according to Law of Petroleum activities §2-1).	WILDCAT
Status Status for the wellbore. Legal values are: BLOWOUT: A blowout has occurred in the well. CLOSED: A development wellbore that has been closed in a shorter or longer periode. Also applies to development wellbores where drilling is completed, but production/injection has not yet been reported. DRILLING: The well is in the drilling phase - can be active drilling, logging, testing or plugging, JUNKED: The drilling operation has been terminated due to technical problems. P&A: Exploration: The well is plugged and abandoned, and can not be reentered for further use. Development wells: The production/injection from/to the well is stopped and the well is plugged. The wellhead is removed or else made unavailable for further well operations. PLUGGED: The wellbore has been plugged, but the upper parts of the wellbore can be re-used. A sidetrack might be drilled at a later stage. PRODUCING: It was produced from the wellbore at the time of the operators last monthly report to the Norwegian Offshore Directorate. INJECTING: It was injected to the wellbore at the time of the operators last monthly report to the Norwegian Offshore Directorate. PREDRILLED: The upper part of the well has been drilled, usually as part of a batch-drilling campaign covering several wellbores. RE-CLASS TO DEV: Exploration wellbore that is reclassified to a development wellbore. RE-CLASS TO TEST: Exploration wellbore that is reclassified to test production. SUSPENDED: The drilling operation in the wellbore has been temporarily stopped. The current plan is to continue drilling later on.	P&A
Press release	link
Multilateral Indicator telling if the parent well is multilateral, meaning it has more than one branch radiating from the main borehole. Example of legal values: YES, NO. See also Norwegian Offshore Directorate guidelines for designation of wells and wellbores.	NO
Factmaps in new window	link
Main area Name of the area on the Norwegian Continental Shelf where the wellbore is located. Legal values: BARENTS SEA, NORWEGIAN SEA, NORTH SEA.	NORWEGIAN SEA
Discovery Name of the discovery the wellbore is related to.	6405/7-1 (Ellida)
Well name Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.	6405/7-1
Production licence Official designation of the production licence the wellbore was drilled or planned to be drilled from ( well head posistion).	281
Drilling operator Name of the licensee starting the drilling operation on behalf of the active production license (well head position). This will usually equal the operator of the production license.	Statoil ASA (old)
Drill permit The drilling permit number together with the version of the drilling permit as stated in the drilling permit granted by the Norwegian Offshore Directorate.	1060-L
Drilling facility Norwegian Offshore Directorate's name of the facility which the wellbore was drilled from.	WEST NAVIGATOR
Drilling days Number of days from wellbore entry to wellbore completion.	113
Entered date The date when he wellbore was spudded. For sidetracks: The date when new formation was drilled by kicking off from the mother-wellbore,	20.06.2003
Completed date Exploration wellbores from moveable facilities: For floating facilities - date when anchor handling is started. For jackups - date the jacking-down started. Exploration wellbores from fixed facilities and all development wellbores: Date when the wellbore is at total depth, and last casing, liner or screen is set. In case of immediate plugging of the wellbore, completed date equals the date the last plug i set in the wellbore. Date when the wellbore is at total depth, and last casing, liner or screen is set. In case of immediate plugging of the wellbore, completed date equals the date the last plug i set in the wellbore.	10.10.2003
Release date Date when raw data which has been reported to the authorities from the wellbore is not confidential any longer. Normally 2 years after finishing the drilling. May be earlier if the area of the production license is relinquished.	10.10.2005
Publication date Date quality control of the wellbore information was completed, so it can be published on the internet as a 'Well Data Summary Sheet' wellbore with more information available than other wellbores.	07.11.2005
Purpose - planned Pre-drill purpose of the wellbore. Legal values for exploration wellbores: WILDCAT, APPRAISAL, WILDCAT-CCS, APPRAISAL-CCS. Example of legal values for development wellbores: OBSERVATION, PRODUCTION, INJECTION.	WILDCAT
Content For exploration wellbores, status of discovery. Legal values: DRY, SHOWS (trace amounts of hydrocarbons), GAS, GAS/CONDENSATE, OIL or OIL/GAS. SHOWS (GAS SHOWS, OIL SHOWS or OIL/GAS SHOWS) are detected as fluorescent cut (organic extract), petroleum odour, or visual stain on cuttings or cores, or as increased gas reading on the mud-loggers gas detection equipment. Legal values for WILDCAT-CCS and APPRAISAL-CCS: WATER For development wellbores, type of produced/injected fluid. Legal values: WATER, CUTTINGS, NOT AVAILABLE, OIL, GAS/CONDENSATE, OIL/GAS, CO2, GAS, WATER/GAS, NOT APPLICABLE.	OIL
Discovery wellbore Indicator which tells if the wellbore made a new discovery. Legal values: YES, NO. Prior to press-release or other information regarding drilling results, the indicator will be “NO” as a default.	YES
1st level with HC, age Age of lithostratigraphic unit, 1st level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE. See also Norwegian Offshore Directorate bulletins.	LATE CRETACEOUS
1st level with HC, formation Name of lithostartigraphic unit, 1st level, where hydrocarbons were encountered. Shown only for released wells. Examples of legal values: BASEMENT, COOK FM, EKOFISK FM, HEIMDAL FM, SANDNES FM, SOGNEFJORD FM, TARBERT FM, BRENT GP. See also Norwegian Offshore Directorate bulletins.	NISE FM
Kelly bushing elevation [m] Elevation of the rotary kelly bushing (RKB) above mean sea level.	36.0
Water depth [m] Depth in metres betweem mean sea level and sea floor.	1206.0
Total depth (MD) [m RKB] Total measured length of wellbore from kelly bushing to total depth (driller's depth).	4300.0
Final vertical depth (TVD) [m RKB] Vertical elevation from total depth to kelly bushing. Shown only for released wells. Referred to as true vertical depth (TVD).	4299.0
Maximum inclination [°] Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.	7.2
Bottom hole temperature [°C] Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.	129
Oldest penetrated age Age (according to Geologic Time Scale 2004 by F. M. Gradstein, et al. (2004)) of the oldest penetrated formation. May differ from age at TD for example in deviated wellbores. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EARLY PERMIAN, EARLY TRIASSIC, EOCENE.	LATE CRETACEOUS
Oldest penetrated formation Name of the oldest lithostratigraphic unit penetrated by the wellbore. Shown only for released wells. In most wellbores this is formation or group at total depth. May differ from formation or group at TD for example in wellbores drilled with high deviation or through faults. Examples of legal values: AMUNDSEN FM, BALDER FM, BASEMENT, BLODØKS FM, BRYNE FM, BURTON FM, COOK FM, DRAKE FM, DRAUPNE FM, EKOFISK FM, DUNLIN GP.	LYSING FM
Geodetic datum Reference system for coordinates. Example of legal values: ED50.	ED50
NS degrees Geographic coordinate of the wellhead, north-south degrees.	64° 17' 16.42'' N
EW degrees Geographic coordinate of the wellhead, east-west degrees.	5° 7' 58.6'' E
NS UTM [m] Universal Transverse Mercator coordinate of the wellhead, north-south.	7131004.00
EW UTM [m] Universal Transverse Mercator coordinate of the wellhead, east-west.	603242.59
UTM zone Universal Transverse Mercator zone. Examples of legal values: 31, 32, 33, 34.	31
NPDID wellbore Norwegian Offshore Directorate's unique id for the wellbore.	4749

Wildcat 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 results

Well 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 discovery

Testing

A 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?	YES

Cuttings at the Norwegian Offshore Directorate
Cutting sample, top depth [m]	Cutting samples, bottom depth [m]
1920.00	4300.00

Cores at the Norwegian Offshore Directorate

Cores at the Norwegian Offshore Directorate
Core sample number	Core sample - top depth	Core sample - bottom depth	Core sample depth - uom
1	2754.0	2764.0	[m ]
2	2781.0	2806.6	[m ]
3	2808.0	2831.6	[m ]
4	2835.0	2861.5	[m ]
5	2862.0	2869.4	[m ]
6	3751.0	3756.0	[m ]
7	3757.0	3783.1	[m ]

Cores at the Norwegian Offshore Directorate
Total core sample length [m]	124.2

Cores at the Norwegian Offshore Directorate
Cores available for sampling?	YES

Core photos

Core photos

2754-2758m	2758-2762m	2762-2764m	2781-2785m	2785-2789m
			$Core photo at depth: 2801-2805m$
2789-2793m	2793-2797m	2797-2801m	2801-2805m	2805-2806m

2808-2812m	2812-2816m	2816-2820m	2820-2824m	2824-2828m

2828-2831m	2835-2839m	2839-2843m	2843-2847m	2847-2851m

2851-2855m	2855-2859m	2859-2861m	2862-2866m	2866-2869m

3751-3755m	3755-3756m	3757-3761m	3761-3765m	3765-3769m

3769-3773m	3773-3777m	3777-3781m	3781-3783m

Oil samples at the Norwegian Offshore Directorate

Oil samples at the Norwegian Offshore Directorate
Test type	Bottle number	Top depth MD [m]	Bottom depth MD [m]	Fluid type	Test time	Samples available
DST		2811.70	2758.00	OIL	02.10.2003 - 21:00	YES

Casing and leak–off tests

Casing and leak–off tests
Casing type	Casing diam. [inch]	Casing depth [m]	Hole diam. [inch]	Hole depth [m]	LOT/FIT mud eqv. [g/cm3]	Formation test type
SURF.COND.	30	1310.0	36	1310.0	0.00	LOT
INTERM.	20	1900.0	26	1910.0	1.33	LOT
INTERM.	13 3/8	2417.0	17	2425.0	1.42	LOT
INTERM.	11 3/4	2741.0	14	2741.0	1.60	LOT
INTERM.	9 5/8	3187.0	12 1/4	3200.0	1.70	LOT
OPEN HOLE		4300.0	8 1/2	4300.0	0.00	LOT

Drill stem tests (DST)

Drill stem tests (DST)
Test number	From depth MD [m]	To depth MD [m]	Choke size [mm]
1.0	2758	2812	12.7

Drill stem tests (DST)
Test number	Final shut-in pressure [MPa]	Final flow pressure [MPa]	Bottom hole pressure [MPa]	Downhole temperature [°C]
1.0				72

Drill stem tests (DST)
Test number	Oil [Sm3/day]	Gas [Sm3/day]	Oil density [g/cm3]	Gas grav. rel.air	GOR [m3/m3]
1.0	40	7000			175

Logs

Logs
Log type	Log top depth [m]	Log bottom depth [m]
MRIL GR	2750	3112
MRIL GR	3200	4300
MWD LWD - DIR RES GR	1312	2425
MWD LWD - DIR RES GR	2440	4300
MWD LWD - DIR RES GR NUC.SON	1242	1920
MWD LWD - DIR RES GR NUCL.SON	2428	2816
PFC GR EZSV BRIDGE PLUG	2650	2840
RCI GR	2754	2886
RCI GR	2760	3158
RCI GR	2763	2824
RCI GR	3227	4195
RCI GR	3757	3757
RCOR GR	2765	3174
RCOR GR	4099	4293
SBT CCL GR	2180	3185
STAR GR	2736	3197
TTRM DSL CN ZDL DLL	3187	4300
TTRM DSL CN ZDL XMAC DLL MLL	3200	2625
TTRM DSL ORIT XMAC DLL MLL	1900	2416
TTRM DSL ORIT XMACII.HDLL MLL	3187	4300
VSP	1885	4295

Lithostratigraphy

Lithostratigraphy
Top depth [mMD RKB]	Lithostrat. unit
1242	NORDLAND GP
1242	NAUST FM
1935	HORDALAND GP
1935	BRYGGE FM
2506	ROGALAND GP
2506	TARE FM
2602	TANG FM
2664	SHETLAND GP
2664	SPRINGAR FM
2757	NISE FM
2960	KVITNOS FM
3665	CROMER KNOLL GP
3665	LYSING FM

Composite logs

Composite logs
Document name	Document format	Document size [MB]
4749	pdf	0.58

Geochemical information

Geochemical information
Document name	Document format	Document size [MB]
4749_1	pdf	6.05

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 name	Document format	Document size [MB]
4749_6405_7_1_COMPLETION_LOG	.pdf	0.99
4749_6405_7_1_COMPLETION_REPORT	.PDF	6.81

Drilling mud

Drilling mud
Depth MD [m]	Mud weight [g/cm3]	Visc. [mPa.s]	Mud type
1421	1.03		SW / BENTONITE 7
1910	1.35		SEAWATER/CMC
2070	1.23	20.0	GLYDRIL DW 37
2425	1.23	18.0	GLYDRIL DW 37
2742	1.37	18.0	GLYDRIL DW 37
2805	1.45	19.0	GLYDRIL DW 37
2816	1.35	20.0	GLYDRIL DW 37
2862	1.45	22.0	GLYDRIL DW 37
3200	1.45	19.0	GLYDRIL DW 37
3411	1.41	21.0	GLYDRIL DW 37
3764	1.41	21.0	GLYDRIL DW 37
4062	1.41	21.0	GLYDRIL DW 37
4300	1.41	22.0	GLYDRIL DW 37

Thin sections at the Norwegian Offshore Directorate

Thin sections at the Norwegian Offshore Directorate
Depth	Unit
2840.10	[m ]
2762.60	[m ]

6405/7-1