Wellbore: 2/7-29 - 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.	2/7-29
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
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.	NORTH SEA
Discovery Name of the discovery the wellbore is related to.	2/7-29
Well name Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.	2/7-29
Production licence Official designation of the production licence the wellbore was drilled or planned to be drilled from ( well head posistion).	145
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.	BP Norway Limited U.A.
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.	765-L
Drilling facility Norwegian Offshore Directorate's name of the facility which the wellbore was drilled from.	MÆRSK GUARDIAN
Drilling days Number of days from wellbore entry to wellbore completion.	111
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,	18.09.1993
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.	06.01.1994
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.	06.01.1996
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.	24.09.2003
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 JURASSIC
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.	ELDFISK FM
Kelly bushing elevation [m] Elevation of the rotary kelly bushing (RKB) above mean sea level.	42.2
Water depth [m] Depth in metres betweem mean sea level and sea floor.	72.0
Total depth (MD) [m RKB] Total measured length of wellbore from kelly bushing to total depth (driller's depth).	4900.0
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).	4893.0
Maximum inclination [°] Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.	7.6
Bottom hole temperature [°C] Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.	170
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.	EARLY PERMIAN
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.	ROTLIEGEND GP
Geodetic datum Reference system for coordinates. Example of legal values: ED50.	ED50
NS degrees Geographic coordinate of the wellhead, north-south degrees.	56° 18' 43.62'' N
EW degrees Geographic coordinate of the wellhead, east-west degrees.	3° 4' 55.28'' E
NS UTM [m] Universal Transverse Mercator coordinate of the wellhead, north-south.	6240959.65
EW UTM [m] Universal Transverse Mercator coordinate of the wellhead, east-west.	505074.49
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.	2124

Well 2/7-29 was the second commitment well on licence PL 145. The primary objective was to establish the presence, quality and fluid content of Jurassic sandstones in Prospects JU2 and JU7 via cores and wire line logs and to evaluate their productivity and fluid properties if hydrocarbon bearing. The pre-Cretaceous was to be accurately dated via biostratigraphy. The secondary objective was to verify the presence, quality and fluid content of Permian sandstones in Prospect P2, and if possible to test the margin of the Jurassic JU2-B Prospect located stratigraphically between JU2 and JU7.

Operations and results

Exploration well 2/7-29 was spudded with the jack-up installation "Maersk Guardian" on 18 September 1993 and drilled to TD at 4900 m in mudstones of the Permian Rotliegend Group. A 9 7/8"pilot hole was drilled to 310 m before opening to 36" to evaluate possible shallow gas. No shallow gas was observed and the 30" casing was set at 302 m. A further 9 7/8" pilot hole was drilled to 1155 m before opening to 26" and the 20" casing set at 1146 m. The well was drilled with seawater and hi-vis sweeps down to 310 m, with bentonite mud from 310 m to 1153 m, and with synthetic oil (ester) based "AQUAMUL B II EBM" mud from 1153 m to TD.

Hydrocarbons were encountered in 129m of gross (49m net) sandstone in the JU2 prospect (Eldfisk Fm.), the shallower of the Jurassic prospects. Log evaluation established an Oil-Down-To at 4530 m TVDSS. Mean porosities of 12% and permeability in the range 0.01 to 80 mD were measured from core and log data over the pay zone. The mean reserves for the discovery are estimated at 9.3mmbbl (1.48mmcum). Two sand intervals of 12.5 and 19m gross thickness were encountered in the JU7 target. The upper interval contained hydrocarbons. A gross sandstone thickness of 46m was encountered in the Early Permian, although no hydrocarbons were present.

A total of seven cores were cut, five in the Jurassic JU2 sandstone (Eldfisk Fm.), one in the Jurassic JU7 sandstone (Eldfisk Fm.) and one in the Permian P2 Rotliegend sandstone. JU2 was cored from 4474 to 4549 m and had moderate to good shows to 4539 m. However, two logging runs with the Schlumberger MDT tool showed the JU2 formation to be generally tight.

JU7 was cored from 4684 to 4703 m and was found to grade to siltstone below 4688 m. Minor shows were present in the sandstone above this depth but from the MDT runs the formation was found to be tight. The Permian P2 Rotliegend sandstone was cored from 4853 m to 4872 m but did not contain hydrocarbons. This formation also proved tight from the second MDT logging run. Two PVT samples and a one-gallon dead-oil sample were obtained in JU2. The one-gallon sample proved to be oil when emptied at well site.

The well was permanently abandoned as an oil discovery on 6 January 1994.

Testing

No drill stem test was performed.

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	4474.0	4483.6	[m ]
2	4483.6	4501.3	[m ]
3	4501.3	4519.0	[m ]
4	4519.0	4538.0	[m ]
5	4538.0	4548.8	[m ]
6	4684.1	4703.3	[m ]
7	4853.0	4872.0	[m ]

Cores at the Norwegian Offshore Directorate
Total core sample length [m]	113.0

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

Core photos

Core photos

4474-4479m	4479-4483m	4483-4488m	4488-4493m	4493-4498m

4498-4501m	4501-4506m	4506-4511m	4511-4516m	4516-4519m

4519-4524m	4524-4529m	4529-4534m	4534-4538m	4538-4543m

4543-4548m	4548-4549m	4684-4689m	4689-4694m	4694-4699m

4699-4703m	4853-4858m	4858-4863m	4863-4868m	4868-4872m

Casing and leak–off tests

Casing and leak–off tests
Casing type	Casing diam. [inch]	Casing depth [m]	Hole diam. [inch]	Hole depth [m]	Formation test type
CONDUCTOR	30	302.0	36	310.0	LOT
SURF.COND.	20	1146.0	26	1155.0	LOT
INTERM.	13 3/8	3124.0	17 1/2	3130.0	LOT
INTERM.	9 7/8	4356.0	12 1/4	4366.0	LOT
OPEN HOLE		4900.0	8 3/8	4900.0	LOT

Logs

Logs
Log type	Log top depth [m]	Log bottom depth [m]
CST GR	4225	4371
DIL AS CAL GR	3126	4371
DIL AS GR	71	3133
DIL MSFL GR	4363	4906
DSI LDL CNL GR	4363	4892
MDT GR	4491	4688
MDT GR	4491	4868
MWD	114	308
MWD	309	3130
MWD	3308	3483
MWD - LWD CDR	114	310
MWD - LWD CDR	309	1154
MWD - LWD CDR	3140	3308
MWD - LWD CDR	3483	4900
OBDT GR	4363	4907
VSP	1160	4880

Lithostratigraphy

Lithostratigraphy
Top depth [mMD RKB]	Lithostrat. unit
114	NORDLAND GP
1613	HORDALAND GP
2999	ROGALAND GP
2999	BALDER FM
3015	SELE FM
3069	LISTA FM
3112	VÅLE FM
3138	SHETLAND GP
3138	EKOFISK FM
3190	TOR FM
3681	HOD FM
4092	BLODØKS FM
4107	HIDRA FM
4225	CROMER KNOLL GP
4225	RØDBY FM
4228	SOLA FM
4329	ÅSGARD FM
4363	TYNE GP
4363	MANDAL FM
4391	FARSUND FM
4473	ELDFISK FM
4602	FARSUND FM
4658	HAUGESUND FM
4664	ELDFISK FM
4698	HAUGESUND FM
4756	NO FORMAL NAME
4789	NO GROUP DEFINED
4789	SMITH BANK FM
4800	ZECHSTEIN GP
4853	ROTLIEGEND GP

Composite logs

Composite logs
Document name	Document format	Document size [MB]
2124	pdf	0.43

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]
2124_2_7_29_COMPLETION_REPORT_AND_LOG	pdf	34.83

Drilling mud

Drilling mud
Depth MD [m]	Mud weight [g/cm3]	Visc. [mPa.s]	Mud type
301	1.05		WATER BASED
308	1.08		WATER BASED
554	1.11	8.0	WATER BASED
949	1.81	20.0	WATER BASED
1148	1.15	5.0	WATER BASED
1153	1.17	5.0	OIL BASED
2028	1.60	49.0	OIL BASED
2259	1.59	48.0	OIL BASED
2498	1.60	48.0	OIL BASED
2705	1.59	46.0	OIL BASED
2812	1.60	47.0	OIL BASED
3013	1.81	22.0	WATER BASED
3130	0.00		OIL BASED
3138	1.62	51.0	OIL BASED
3308	1.61	44.0	OIL BASED
3457	1.62	43.0	OIL BASED
3483	1.62	45.0	OIL BASED
3738	1.62	50.0	OIL BASED
3843	1.62	50.0	OIL BASED
3901	1.62	46.0	OIL BASED
4009	1.62	47.0	OIL BASED
4224	1.62	48.0	OIL BASED
4274	1.81	24.0	WATER BASED
4291	1.81	61.0	OIL BASED
4352	1.81	56.0	OIL BASED
4366	1.81	61.0	OIL BASED
4366	1.82	50.0	OIL BASED
4366	1.82	53.0	OIL BASED
4387	1.82	67.0	OIL BASED
4395	1.87	67.0	OIL BASED
4501	1.87	60.0	OIL BASED
4519	1.87	59.0	OIL BASED
4574	1.87	59.0	OIL BASED
4599	1.87	61.0	OIL BASED
4684	1.87	68.0	OIL BASED
4703	1.87	62.0	OIL BASED
4900	1.90	67.0	OIL BASED

Thin sections at the Norwegian Offshore Directorate

Thin sections at the Norwegian Offshore Directorate
Depth	Unit
4544.00	[m ]
4540.65	[m ]
4532.00	[m ]
4529.65	[m ]
4523.30	[m ]
4517.65	[m ]
4514.00	[m ]
4508.85	[m ]
4506.00	[m ]
4504.05	[m ]
4500.80	[m ]
4493.35	[m ]
4490.70	[m ]
4487.85	[m ]
4482.65	[m ]
4477.65	[m ]

2/7-29