1/9-4

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• General information

  General information

  Attribute	Value
  Wellbore name Official name of wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.	1/9-4
  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.	SUSPENDED
  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.	TOMMELITEN GAMMA
  Discovery Name of the discovery the wellbore is related to.	1/9-4 Tommeliten Gamma
  Well name Official name of the parent well for the wellbore based on Norwegian Offshore Directorate guidelines for designation of wells and wellbores.	1/9-4
  Production licence Official designation of the production licence the wellbore was drilled or planned to be drilled from ( well head posistion).	044
  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.	Den norske stats oljeselskap a.s
  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.	182-L
  Drilling facility Norwegian Offshore Directorate's name of the facility which the wellbore was drilled from.	ROSS RIG (1)
  Drilling days Number of days from wellbore entry to wellbore completion.	153
  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,	13.08.1977
  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.	12.01.1978
  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.	12.01.1980
  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.	26.05.2009
  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.	GAS/CONDENSATE
  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.	PALEOCENE
  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.	EKOFISK FM
  2nd level with HC, age Age of lithostratigraphic unit, 2nd level, where hydrocarbons were encountered. Examples of legal values: CRETACEOUS, EARLY CRETACEOUS, LATE JURASSIC, EOCENE.	LATE CRETACEOUS
  2nd level with HC, formation Name of lithostartigraphic unit, 2nd 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.	TOR FM
  Kelly bushing elevation [m] Elevation of the rotary kelly bushing (RKB) above mean sea level.	25.0
  Water depth [m] Depth in metres betweem mean sea level and sea floor.	75.0
  Total depth (MD) [m RKB] Total measured length of wellbore from kelly bushing to total depth (driller's depth).	3710.0
  Maximum inclination [°] Maximum deviation, in degrees, from a vertical well path.Shown only for released wells.	7.5
  Bottom hole temperature [°C] Estimated temperature at final total depth of the wellbore. Shown only for released wells. See discription.	150
  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 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.	ZECHSTEIN GP
  Geodetic datum Reference system for coordinates. Example of legal values: ED50.	ED50
  NS degrees Geographic coordinate of the wellhead, north-south degrees.	56° 29' 3.76'' N
  EW degrees Geographic coordinate of the wellhead, east-west degrees.	2° 56' 0.29'' E
  NS UTM [m] Universal Transverse Mercator coordinate of the wellhead, north-south.	6260132.83
  EW UTM [m] Universal Transverse Mercator coordinate of the wellhead, east-west.	495899.06
  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.	247

• Wellbore history

  General

  Well 1/9-4 was drilled on a salt diapir structure in the Central Graben in the neighbourhood of the Norwegian - UK median line. The primary purpose was to test the Ekofisk and Tor formations of Danian and Maastrichtian age. Lower possible porous zones in chalk and Jurassic sands, if present, were secondary objectives.

  Operations and results

  Wildcat well 1/9-4 was spudded with the semi-submersible installation Ross Rig on 13 August 1977 and drilled to TD at 3710 m in Late Permian Zechstein salt. There were no serious drilling problems down to a depth of 3100 m. At 3100 m the bit-junksub assembly was lost in the hole. The hole was cemented back and sidetracked after the fishing attempts proved unsuccessful. After one unsuccessful sidetrack attempt the hole was sidetracked again from 3041 m and drilled on to core point at 3122 m. When cutting core no 10 the bottom hole assembly got stuck and a long section of the BHA had to be left in the hole. After some unsuccessful attempts on jarring, the hole was cemented and sidetracked again, from 3059 m in the first sidetrack hole. This second sidetracked hole was drilled to a measured depth of 3353 m. At this point 7" liner was run. 6" hole was drilled to a total measured depth of 3710 m with only minor problems and top of the salt was found at 3650 m. The 6" hole was logged and plugged back. It was found necessary to perform a squeeze job around the 7" liner shoe, but when attempting to pull out after this operation, the BHA stuck just above the cementing stinger. Jarring did not free the pipe, and a cement plug was set above the fish. The well was drilled with high viscosity spud mud of pre-hydrated bentonite, lime, and caustic soda down to 437 m and with Drispac/lime mud from 437 m to 2580 m. From 2580 m the lime was phased out and the remaining well to TD was drilled with a lignite/lignosulphonate gel mud. During abandonment an anchor chain broke in severe weather. The well was plugged back while a supply boat pulled on the anchor chain. A cap was installed on the well head and the well was suspended.

  No significant reservoir rock was penetrated above Danian level. The Early Cretaceous Valhall Formation was found resting directly on the salt. No Jurassic sediments were penetrated by the well. Hydrocarbons were encountered and tested in the Ekofisk and Tor Formations from 3114 m down to top Hod Formation at 3312 m. Above the reservoir shows in the form of cut and fluorescence was recorded on occasional shale/limestone/silty cuttings was seen from 1990 to 2733 m. More continuous shows were seen on limestone/shale cuttings in the interval 2808 to 2991 m in the Lower Hordaland Group, through the Balder Formation and into the Sele Formation.

  Nine cores were cut from - 3123 m to - 3273 m with close to 100% recovery. No RFT surveys were run and no wire line fluid samples were taken.

  The well was suspended on12 January 1978 as a dry well.

  Testing

  Four drill stem tests to evaluate productivity and fluid composition were carried out. Hydrocarbons were produced during all the tests. Weather conditions and operational problems interfered with the designed test program.

  DST 1 tested the Tor Formation in from interval 3292 to 3296 m. The second flow produced 30582 Sm3 of gas and in the range of 16 Sm3 oil /day. There was no water production. The oil produced had a gravity of 46 deg API and the gas gravity (air = 1) was 0.68. GOR varied in the range 890 to 14000 Sm3/Sm3. Maximum recorded down hole temperature was 136 deg C but the temperature readings were not stable.

  DST 2 tested the Tor Formation from the interval 3235 to 3255 m. After acid stimulation the well flowed 673940 Sm3 of gas and 592 Sm3 oil /day on a 48/64" choke. The oil gravity was 48-49 deg API at separator conditions and the gas gravity (air = 1) was 0.67 with 2 - 3 % CO2. The GOR was in the range 890 to 1160 Sm3/Sm3. No representative temperature reading is available from this test.

  DST 3 tested the Ekofisk Formation from the interval 3176 to 3198 m. After acid stimulation the well flowed 32000 Sm3 of gas and 17 Sm3 oil /day with a bottom hole flowing pressure 750 psig at depth 3154 m. This test also produced some emulsion and water. The gas and oil gravities were 0.81 (air = 1) and 45 deg API at separator conditions, respectively. 3% CO2 was measured in the gas. The GOR varied in the range 1070 to 2140 Sm3/Sm3. Due probably to gas expansion and cooling in the borehole it is assumed that the maximum recorded temperature of 122.2 deg C was not representative for the formation.

  DST 4 tested the Ekofisk Formation in the intervals 3127 to 3137 and 3120 to 3123 m. After acid treatment the well flowed 498380 Sm3 of gas and 223 Sm3 oil /day on a 48/64" choke. The gas and oil gravities were 0.688 (air = 1) and 50 - 51 deg API at separator conditions, respectively. 2-3% CO2 was measured in the gas. The GOR varied in the range 960 - 2850 Sm3/Sm3. The maximum temperature recorded, and the one assumed to be the most representative for the Formation in all four tests, was 134.2 deg C.

• 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]
  153.00	3710.00

• 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	3122.8	3141.2	[m ]
  2	3141.2	3159.5	[m ]
  3	3159.5	3173.5	[m ]
  4	3173.5	3191.8	[m ]
  5	3191.8	3210.1	[m ]
  6	3210.1	3218.6	[m ]
  7	3219.9	3238.0	[m ]
  8	3238.2	3256.5	[m ]
  9	3256.5	3273.8	[m ]

  Cores at the Norwegian Offshore Directorate

  Total core sample length [m]	149.6

  Cores at the Norwegian Offshore Directorate

  Cores available for sampling?	YES

• Core photos

  Core photos

  3122-3125m	3125-3128m	3128-3130m	3130-3133m	3133-3136m
  3136-3138m	3138-3141m	3141-3143m	3143-3146m	3146-3149m
  3149-3152m	3152-3154m	3154-3157m	3157-3159m	3159-3162m
  3162-3164m	3164-3167m	3167-3170m	3170-3173m	3173-3173m
  3173-3176m	3176-3178m	3178-3181m	3181-3184m	3184-3187m
  3187-3189m	3189-3191m	3191-3195m	3194-3197m	3197-3199m
  3199-3202m	3202-3205m	3205-3208m	3208-3210m	3210-3212m
  3212-3215m	3215-3218m	3218-3218m	3219-3222m	3222-3225m
  3225-3228m	3222-3225m	3225-3228m	3228-3230m	3230-3233m
  3233-3236m	3236-3238m	3238-3240m	3240-3243m	3243-3246m
  3246-3249m	3249-3251m	3251-3254m	3254-3256m	3256-3259m
  3259-3261m	3261-3264m	3264-3267m	3267-3270m	3270-3272m
  3272-3273m

• 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	TEST1	3292.00	3296.00		01.12.1977 - 00:00	YES
  DST	TEST2	3235.00	3255.00		15.12.1977 - 03:00	YES
  DST	TEST3	3176.00	3198.00		24.12.1977 - 19:00	YES
  DST	TEST4	3137.00	3127.00		29.12.1977 - 00:00	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
  CONDUCTOR	30	151.0	36	151.0	0.00	LOT
  SURF.COND.	20	428.0	26	437.0	0.00	LOT
  INTERM.	13 3/8	1376.0	17 1/2	1391.0	0.00	LOT
  INTERM.	9 5/8	2569.0	12 1/4	2580.0	0.00	LOT
  LINER	7	3352.0	8 1/2	3362.0	0.00	LOT
  OPEN HOLE		3710.0	6	3710.0	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	3292	3296	19.0
  2.0	3235	3255	19.0
  3.0	3176	3198	19.0
  4.0	3137	3127	19.0

  Drill stem tests (DST)

  Test number	Final shut-in pressure [MPa]	Final flow pressure [MPa]	Bottom hole pressure [MPa]	Downhole temperature [°C]
  1.0
  2.0
  3.0
  4.0

  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	16	30582	0.790
  2.0	592	673944	0.790
  3.0		311487
  4.0	223	498379	0.770	0.690

• Logs

  Logs

  Log type	Log top depth [m]	Log bottom depth [m]
  CBL VDL GR	282	1375
  CBL VDL GR	1334	2553
  CBL VDL GR	2445	3345
  CBL VDL GR	3050	3300
  CBL VDL GR	3075	3338
  DIL	3065	3348
  DLL MSFL CAL SP GR	3000	3347
  FDC CNL CAL GR	427	3707
  HDT	2875	3349
  HDT	3345	3640
  IES SP	2090	3347
  ISF SONIC	427	3705
  SONIC	151	435
  VELOCITY	535	3684

• Lithostratigraphy

  Lithostratigraphy

  Top depth [mMD RKB]	Lithostrat. unit
  100	NORDLAND GP
  1025	HORDALAND GP
  2941	ROGALAND GP
  2941	BALDER FM
  2960	SELE FM
  3021	LISTA FM
  3091	VÅLE FM
  3114	SHETLAND GP
  3114	EKOFISK FM
  3212	TOR FM
  3312	HOD FM
  3450	BLODØKS FM
  3494	HIDRA FM
  3646	CROMER KNOLL GP
  3646	RØDBY FM
  3665	ÅSGARD FM
  3690	ZECHSTEIN GP

• Geochemical information

  Geochemical information

  Document name	Document format	Document size [MB]
  247_1	pdf	2.18
  247_2	pdf	3.15
  247_3	pdf	0.52

• 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]
  247_00_1_9_4_Completion_Log	pdf	2.48
  247_00_1_9_4_Completion_Report	pdf	34.55

• 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]
  247_01_WDSS_General_Information	pdf	0.21
  247_03_WDSS_lithlog	pdf	0.06

• Drilling mud

  Drilling mud

  Depth MD [m]	Mud weight [g/cm3]	Visc. [mPa.s]	Yield point [Pa]	Mud type	Date measured
  151	1.02			WATERBASED
  954	1.17			WATERBASED
  1394	1.70			WATERBASED
  2580	1.89			WATERBASED
  3100	1.75			WATERBASED
  3210	1.75			WATERBASED
  3555	1.70			WATERBASED
  3710	1.72			WATERBASED