Wellbore: 2/1-9 A - 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.	2/1-9 A
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).	APPRAISAL
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
Field Name of the field the wellbore is related to.	GYDA
Discovery Name of the discovery the wellbore is related to.	2/1-9 Gyda Sør
Well name Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.	2/1-9
Production licence Official designation of the production licence the wellbore was drilled or planned to be drilled from ( well head posistion).	019 B
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.	713-L
Drilling facility Norwegian Offshore Directorate's name of the facility which the wellbore was drilled from.	ROSS ISLE
Drilling days Number of days from wellbore entry to wellbore completion.	51
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,	18.01.1992
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.	08.03.1992
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.	08.03.1994
Plugged and abondon date Date when the P&A-operations of the wellbore was finished, as reported by the operator to the Norwegian Offshore Directorate throught DDRS (Daily Drilling Reporting System). Only applied once pr. wellhead/surface location.	02.03.2014
Plugged date Date when plugging operations was finished, as reported by the operator to the Norwegian Offshore Directorate through DDRS (Daily Drilling Reporting System).	08.03.1992
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.	17.10.2007
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.	APPRAISAL
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.	NO
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.	ULA FM
Kelly bushing elevation [m] Elevation of the rotary kelly bushing (RKB) above mean sea level.	23.0
Water depth [m] Depth in metres betweem mean sea level and sea floor.	66.0
Total depth (MD) [m RKB] Total measured length of wellbore from kelly bushing to total depth (driller's depth).	4379.0
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).	4124.0
Maximum inclination [°] Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.	60
Bottom hole temperature [°C] Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.	138
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 JURASSIC
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.	ULA FM
Geodetic datum Reference system for coordinates. Example of legal values: ED50.	ED50
NS degrees Geographic coordinate of the wellhead, north-south degrees.	56° 51' 37.77'' N
EW degrees Geographic coordinate of the wellhead, east-west degrees.	3° 5' 4.77'' E
NS UTM [m] Universal Transverse Mercator coordinate of the wellhead, north-south.	6302000.77
EW UTM [m] Universal Transverse Mercator coordinate of the wellhead, east-west.	505162.30
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.	1867

Well 2/1 ?9 A was drilled to appraise the 2/1-9 discovery in the Late Jurassic "Gyda sandstone member" (Ula Formation), by side-tracking up-dip to the crest of the Gyda South structure. If successful, the well could at a later stage be completed as a producer and tie back to Gyda platform. The structure is a fault/dip closure, which lies in the Late Jurassic fairway on the eastern flank of the Central Graben, 6 kilometres south of the Gyda field in the North Sea.

Operations and results

Well 2/1-9 was re-entered on 18 January 1992 by the semi submersible installation Ross Isle. The appraisal sidetrack well 2/1-9 A was kicked off in the 8 1/2" hole from 3270 m in the Late Cretaceous Tor Formation and drilled to TD 4379 m in the Late Jurassic Ula Formation. It took 25 1/2 days (18 1/2 days longer than planned) to drill to coring point at 4140 m. This delay was mainly due to difficulties in controlling the directional tendencies of the BHA's, which required a number of correction runs. In addition, poor bit performance and harder than expected formations exacerbated the slow progress. Hole inclination was 52.8 degrees at coring point. Problems were also experienced during TD logging with stuck logging tools and stuck pipe whilst attempting to retrieve the tool. In addition a 9 bbl influx had to be circulated out during this time. The well was drilled with Novamul ether-based mud from kick-off to TD.

The target Ula Formation sandstone was encountered at 4099 m (3966 m TVD RKB). It was 120 m thick (TVD) and oil-bearing all through. The logs observed no OWC.

Six cores (178 m) were cut in the 8 1/2" hole. All cores had 100% recovery with excellent shows being observed throughout. Core 1 to 5 covered the sandstone of the Ula Formation while core 6 entered into a mud stone member at the base. No H2S was observed whilst coring -despite having high level contingency due to H2S seen on well 2/1-9. The RFT was run and pressure points were recorded, but no fluid samples were taken.

The well was suspended on 8 March 1983 as a potential future Gyda sub sea producer.

Testing

No drill stem test was performed.

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]
3280.00	4379.00

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	4141.0	4178.0	[m ]
2	4178.0	4223.6	[m ]
3	4223.5	4251.5	[m ]
4	4251.5	4279.4	[m ]
5	4279.4	4307.4	[m ]
6	4307.5	4319.1	[m ]

Cores at the Norwegian Offshore Directorate
Total core sample length [m]	178.1

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

Core photos

Core photos

4141-4146m	4146-4151m	4151-4156m	4156-4161m	4161-4166m

4166-4171m	4171-4176m	4176-4178m	4178-4183m	4183-4188m

4188-4193m	4193-4198m	4198-4203m	4203-4208m	4208-4213m

4213-4218m	4218-4223m	4223-4224m	4223-4228m	4228-4233m

4233-4238m	4238-4243m	4243-4248m	4248-4251m	4251-4256m

4256-4261m	4261-4266m	4266-4271m	4271-4276m	4276-4279m

4279-4284m	4284-4289m	4289-4294m	4294-4299m	4299-4304m

4304-4307m	4307-4312m	4312-3217m	4317-4319m

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	164.0	36	165.0	LOT
INTERM.	20	895.0	26	896.0	LOT
INTERM.	13 3/8	2893.0	17 1/2	2895.0	LOT
INTERM.	9 5/8	3938.0	12 1/4	3940.0	LOT
LINER	7	4378.0	8 1/2	4385.0	LOT

Logs

Logs
Log type	Log top depth [m]	Log bottom depth [m]
DIL BHC GR AMS	3272	4385
LDL CNL GR AMS	4320	4385
RFT RPQS GR AMS	4135	4298

Lithostratigraphy

Lithostratigraphy
Top depth [mMD RKB]	Lithostrat. unit
89	NORDLAND GP
1814	HORDALAND GP
2898	ROGALAND GP
2898	BALDER FM
2915	SELE FM
2923	FORTIES FM
2982	LISTA FM
3055	VIDAR FM
3143	LISTA FM
3159	VÅLE FM
3168	SHETLAND GP
3168	EKOFISK FM
3256	TOR FM
3618	HOD FM
3788	BLODØKS FM
3799	HIDRA FM
3819	CROMER KNOLL GP
3819	RØDBY FM
3870	SOLA FM
3881	TUXEN FM
3900	ÅSGARD FM
4068	TYNE GP
4068	MANDAL FM
4084	FARSUND FM
4099	VESTLAND GP
4099	ULA FM

Composite logs

Composite logs
Document name	Document format	Document size [MB]
1867	pdf	0.51

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]
1867_2_1_9_A_COMPLETION_REPORT_AND_LOG	pdf	18.77

Documents – older Norwegian Offshore Directorate WDSS reports and other related documents

Documents – older Norwegian Offshore Directorate WDSS reports and other related documents
Document name	Document format	Document size [MB]
1867_01_WDSS_General_Information	pdf	0.50
1867_02_WDSS_completion_log	pdf	0.22

Drilling mud

Drilling mud
Depth MD [m]	Mud weight [g/cm3]	Visc. [mPa.s]	Mud type
140	0.00	39.0	OIL BASED
3200	1.56	70.0	OIL BASED
3300	1.56	58.0	OIL BASED
3347	1.60	79.0	OIL BASED
3464	1.56	51.0	OIL BASED
3560	1.60	80.0	OIL BASED
3681	1.60	82.0	OIL BASED
3860	1.60	87.0	OIL BASED
4000	1.61	91.0	OIL BASED
4223	1.62	90.0	OIL BASED
4318	1.60	88.0	OIL BASED
4379	1.60	101.0	OIL BASED

Palynological slides at the Norwegian Offshore Directorate

Palynological slides at the Norwegian Offshore Directorate
Sample depth	Depth unit	Sample type	Laboratory
4142.6	[m]	C	APT
4152.9	[m]	C	APT
4157.4	[m]	C	APT
4161.7	[m]	C	APT
4166.0	[m]	C	APT
4176.0	[m]	C	APT
4179.0	[m]	C	APT
4185.9	[m]	C	APT
4195.0	[m]	C	APT
4197.9	[m]	C	APT
4213.7	[m]	C	APT
4230.0	[m]	C	APT
4248.0	[m]	C	APT
4251.8	[m]	C	APT
4263.0	[m]	C	APT
4268.0	[m]	C	APT
4274.0	[m]	C	APT
4277.0	[m]	C	APT
4282.6	[m]	C	APT
4284.0	[m]	C	APT
4290.5	[m]	C	APT
4292.2	[m]	C	APT
4292.4	[m]	C	APT
4293.5	[m]	C	APT
4295.0	[m]	C	APT
4295.6	[m]	C	APT
4296.0	[m]	C	APT
4296.5	[m]	C	APT
4297.5	[m]	C	APT
4298.5	[m]	C	APT
4299.4	[m]	C	APT
4300.1	[m]	C	APT
4300.7	[m]	C	APT
4301.0	[m]	C	APT
4301.5	[m]	C	APT
4302.0	[m]	C	APT
4303.2	[m]	C	APT
4303.5	[m]	C	APT
4304.0	[m]	C	APT
4304.4	[m]	C	APT
4304.7	[m]	C	APT
4305.0	[m]	C	APT
4305.3	[m]	C	APT
4305.6	[m]	C	APT
4313.2	[m]	C	APT
4313.5	[m]	C	APT
4314.1	[m]	C	APT
4314.5	[m]	C	APT
4314.9	[m]	C	APT
4315.1	[m]	C	APT
4316.2	[m]	C	APT
4316.8	[m]	C	APT
4316.9	[m]	C	APT
4317.1	[m]	C	APT
4317.4	[m]	C	APT
4317.6	[m]	C	APT
4317.9	[m]	C	APT
4318.1	[m]	C	APT
4318.2	[m]	C	APT
4319.0	[m]	C	APT
4319.1	[m]	C	APT

2/1-9 A