Rig: Transocean Winner

Name Transocean Winner
Owner Transocean Offshore International Ventures Limited
Manager Transocean Offshore Deepwater Drilling Inc.
Rig Type Semisub
Sub Type Midwater Floater
Jackup Type --
Max Water Depth (ft) 1500
Max Drill Depth (ft) 25000
Dimensions (ft) 226 x 246 x 138
Leg Length (ft) --
Competitive Yes

Current Location

Country --
Region --

Drilling Equipment

Drawworks Type National Oilwell Varco 1625 DE
Drawworks HP 3000
Mud Pumps Type --
Top Drive National Oilwell Varco TDS-4S
Hookload Capacity (lbs) 1250000

Rig Construction Details

Rig Design Gotaverken
Rig Model GVA 4000
Year Built 1983
Country of Build Sweden
Yard Name Arendal Shipyard
Group Yard Name Gotaverken Arendal A/B

Rig Contract Details

Operating Status Retired
Operator

Rig Images

News

8 Jan 2016

Consent for drilling operations using Transocean Winner

Det norske oljeselskap ASA has received consent to use the Transocean Winner mobile drilling facility for production drilling and completion on the Volund field. ransocean Winner is a semi-submersible facility of the GVA 4000 type, built at Gøtaverken Arendal in Gothenburg in 1983 and significantly upgraded in 2006. The facility is owned and operated by Transocean Ltd, registered in the Marshall Islands and classified by DNV GL. Transocean Winner was issued with an Acknowledgement of Compliance (AoC) by the PSA in August 2006. Volund is an oil field in the central North Sea around 10 kilometres south of the Alvheim field. Water depth in the area is 120-130 metres. The field has been developed using a subsea facility tied back to the Alvheim FPSO production vessel, with three horizontal wells. The Petroleum Safety Authority Norway has now granted Det norske oljeselskap ASA consent for drilling operations in compliance with the company's application.

19 Jan 2015

First oil from Bøyla field

Lundin Petroleum AB (Lundin Petroleum) is pleased to announce that first oil from the Bøyla field has been achieved. The Bøyla field commenced production on 19 January 2015. The Bøyla field, located on PL340 in the Norwegian sector of the North Sea, is a subsea tie-back to the Alvheim field where Lundin Petroleum has a 15 percent non-operated interest. The Bøyla field is estimated to contain gross reserves of 23 million barrels of oil equivalents and is expected to produce at a gross peak rate of approximately 20,000 barrels of oil equivalent per day (boepd) once the second production well has been completed, although the plateau rate is expected to be somewhat lower. The drilling operations on the second production well were suspended in late 2014 and the Transocean Winner semisubmersible rig will return to complete the well during the second quarter of 2015 with startup of this well expected by mid-year 2015. The production facility for the Bøyla field is the Alvheim FPSO which is owned by the Alvheim field partners. In addition to the Alvheim and Bøyla fields, the Volund and Vilje fields are also producing to the Alvheim FPSO. Ashley Heppenstall, President & CEO of Lundin Petroleum comments; “With the successful start-up of the Bøyla field on the 19th January 2015 Lundin Petroleum has now successfully brought onstream two of the four development projects which collectively are forecast to bring Lundin Petroleum’s production level to more than 75,000 boepd by the end of 2015. The two ongoing development projects, Bertam offshore Malaysia and Edvard Grieg offshore Norway, continue to progress according to plan and are scheduled to achieve first oil in the second and fourth quarters of 2015 respectively.” Lundin Norway AS, a wholly owned subsidiary of Lundin Petroleum, has a 15 percent interest in PL340. Det norske oljeselskap ASA is the operator of PL340 and has a 65 percent interest and Core Energy AS has a 20 percent interest.

29 Dec 2014

Det Norske receives consent to drill production wells on Alvheim field

Det norske oljeselskap ASA (“Det norske”) has received consent to use Transocean Winner to drill production wells on the Alvheim field.Alvheim is an oil and gas field in blocks 24/6 and 25/4 in the central part of the North Sea, west of Heimdal and close to the boundary with the UK sector. Production on the field began in 2008. Det norske is the operator of the Alvheim field, following the company's purchase of Marathon Oil Norge AS, the field's former operator. The Alvheim field has been developed using a floating production, storage and offloading (FPSO) unit and subsea wells. Oil is stored in the production facility and exported by tanker. Gas is exported through a pipeline connected to a pipeline system on the UK shelf. The PSA has given Det norske consent to use the Transocean Winner mobile drilling facility to drill two new subsea production wells on the Alvheim field. The wells are designated 24/6 K-6 and 24/6 A-5. The consent also covers workover of production well 24/6 B-2.Water depth in the area is 120-130 metres. Drilling is scheduled to start in February 2015 and the activities associated with the first well are estimated to last 139 days.

14 Oct 2014

'Transocean Winner' to begin production drilling at Alvheim and Boyla fields

The PSA has given Det norske oljeselskap ASA (Det norske) consent to use the ‘Transocean Winner’ mobile drilling facility for production drilling at Alvheim and Bøyla in the North Sea. The background to this consent is Det norske's acquisition of Marathon Oil Norge AS (Marathon) and the company's production licence assets on the Norwegian Continental Shelf. Marathon's operatorship of the Alvheim, Vilje, Volund and Bøyla fields will now be transferred to Det norske. The date of transfer of operatorship is set at 15th October 2014. The consent applies to production drilling and completion of 25/4-L-4H at the Alvheim field and 24/9-M-1 H, 24/9-M-1 AH, 24/9-M-2 H, 24/9-M-2 AH, 24/9-M-3 H and 24/9-M-3 AH at Bøyla. Marathon has previously received consent to use ‘Transocean Winner’ for drilling and completion of these wells/well bores, but a change of operator requires the new operator to apply for new consent. This is because consent is an expression of the PSA's confidence that the operating company is able to undertake operations prudently and in compliance with the regulations. The consent is based primarily on our assessment of relevant aspects of the company's management system.

14 Oct 2013

'Transocean Winner' drills dry well for RWE DEA Norge AS on PL 330 in Norway

RWE DEA Norge AS, operator of production licence 330, has completed the drilling of wildcat well 6608/2-1 S. The well was drilled about 60 kilometres east of the Aasta Hansteen field in the Norwegian Sea. The well's primary exploration target was to prove petroleum in Middle Jurassic reservoir rocks (the Fangst group). The secondary exploration target was to prove petroleum in reservoir rocks from the Late Cretaceous (the Shetland group) and the Early Jurassic (the Båt group). The well did not reach the Fangst and Båt groups and no reservoir development was proven in the Shetland group. The well will be classified as dry. Data acquisition and sampling have been carried out. This is the first exploration well in production licence 330. The production licence was awarded in the 18th licensing round in 2004. The well was drilled to a vertical depth of 5574 metres below the sea surface and was terminated in rocks from the Early Cretaceous. Water depth at the site is 303 metres. The well will now be permanently plugged and abandoned. Well 6608/2-1 S was drilled with the Transocean Winner drilling facility, which will now proceed to production licence 203 in the North Sea to complete production wells on the Alvheim field, where Marathon Oil Norge AS is the operator.

13 May 2013

'Transocean Winner' set to be used by RWE Dea Norge AS to drill Cliffhanger South Prospect

The Norwegian Petroleum Directorate has granted RWE Dea Norge AS a drilling permit for well 6608/2-1 S, cf. Section 8 of the Resource Management Regulations. Well 6608/2-1 S will be drilled from the Transocean Winner drilling facility at position 66° 58' 6.99" north and 8° 23' 38.11" east. The drilling programme for well 6608/2-1 S relates to drilling of a wildcat well in production licence 330. RWE Dea Norge AS is the operator with an ownership interest of 40 per cent. The other licensees are Marathon Oil Norge AS with 30 per cent and Lundin Norway AS with 30 per cent. The production licence consists of blocks 6608/1 and 6608/2. The production licence was awarded in the 18th licensing round in 2004. Wildcat well 6608/2-1 S is the first exploration well in production licence 330. The permit is contingent upon the operator securing all other permits and consents required by other authorities before the drilling activity starts.

15 Mar 2013

JORVIK EXPLORATION WELL COMPLETED

Lundin Petroleum AB, has, through its wholly owned subsidiary Lundin Norway AS (Lundin Norway), completed the drilling of exploration well 16/1-17 in PL338. The well targeted the Jorvik prospect located in a separate basin directly east of the Edvard Grieg field. The main objective of well 16/1-17 was to prove the presence of oil-bearing sandstones and conglomerates in a basin fill sequence. Based on sampling, mobile oil is proven in tight reservoir, consisting of conglomeratic and pebbly sandstones. The well was drilled into basement and water pressure indicates a pressure regime close to the Edvard Grieg field and the Luno South discovery. Extensive data acquisition and sampling have been carried out in the well. The whole reservoir sequence including basement has been cored. The semi-submersible drilling rig Transocean Winner drilled the well to a total depth of 2,044 metres below mean sea level, in a water depth of 110 metres. Lundin Norway is the operator and has a 50 percent working interest in PL338. Partners are Wintershall Norge AS with 30 percent and OMV (Norge) AS with 20 percent interest.

23 Feb 2011

THE EARB EXPLORATION WELL IN PL505 HAS SPUDDED, OFFSHORE NORWAY

Lundin Petroleum AB (Lundin Petroleum) is pleased to announce that drilling of exploration well 25/10-11 on the Earb South prospect has commenced. The well is located in licence PL505 in the Norwegian North Sea. The Earb South prospect is located 15 km west of the Balder Field and 35km south of the Heimdal facilities. The well will target sandstones within the Draupne Formation (Brae Formation equivalent) and the Hugin Formation. The Earb South prospect is estimated by Lundin Petroleum to contain gross unrisked prospective gas and condensate resources of 81 million barrel oil equivalents (MMBOE). The planned total depth is 4,460 metres below mean sea level. The well will be drilled with the drilling rig Transocean Winner, and the duration is expected to be 90 days excluding test. Lundin Petroleum holds 30 percent interest in PL505. Partners are Marathon Petroleum Norge AS (operator) with 50 percent interest and VNG with 20 percent.

15 Feb 2011

CATERPILLAR EXPLORATION WELL IN NORWAY IS AN OIL DISCOVERY

Lundin Petroleum AB has successfully concluded the drilling of the Caterpillar exploration well (24/9-10S) and its side track (24/9-10A) located in production licence PL340 BS approximately 31 kilometres south of the Alvheim FPSO in the Norwegian North Sea. The Caterpillar exploration well reached a total vertical depth of 2,161m in the Paleocene Lista Formation. The primary objective of the Caterpillar exploration well was to prove oil in the upper Paleocene reservoir rocks (Hermod Formation). Both the Caterpillar main exploration well as well as its sidetrack encountered respectively a 26 and 24 meter oil column in sandstone reservoir in the Hermod Formation. A comprehensive data acquisition programme was undertaken. Preliminary gross resource range for the Caterpillar discovery is estimated at between 5 to 12 million barrels of oil equivalent (MMboe). Development studies are progressing for the Bøyla (formerly Marihøne) field tieback to the Alvheim FPSO. The Caterpillar discovery located 8 kilometres to the southeast of Bøyla is likely be developed as part of the Bøyla development concept. Ashley Heppenstall President and CEO of Lundin Petroleum comments: "We are very pleased to find additional resources in the Greater Alvheim Area. The Caterpillar discovery will be developed with the Bøyla field as a tieback to the Alvheim FPSO controlled by the same partners." Lundin Petroleum holds 15 percent interest in PL340BS. Partners are Marathon Petroleum (operator) with 65 percent interest and ConocoPhillips with 20 percent. The Transocean Winner rig will now move to production license PL505 to drill the Earb south prospect where Lundin Petroleum has a working interest of 30%.

24 Sep 2010

LUNDIN PETROLEUM SPUDS THE APOLLO PROSPECT EXPLORATION WELL 16/1-14 ON PL338, OFFSHORE NORWAY

Lundin Petroleum AB ("Lundin Petroleum") is pleased to announce that drilling of exploration well 16/1-14 in PL338, has commenced. The well will target the Apollo structure, which is situated immediately to the south of the Draupne field in PL001B, and some 5 kms northwest of and down-dip from the Luno field located in PL338. The main objective of the Apollo well is to test a possible extension of the Draupne field into PL338. Lundin Petroleum currently estimates unrisked gross prospective resources in the range of 20 to 130 million barrels of oil equivalents (MMboe) for the Apollo prospect in PL338. The planned depth is approximately 2,500 metres below mean sea level and the well will be drilled using the semi-submersible drilling rig Transocean Winner. Drilling is expected to take approximately 50 days. Lundin Petroleum is the operator of PL338 with 50 percent interest. Partners are Wintershall Norge ASA with 30 percent and RWE Dea Norge AS with 20 percent interest.

21 Jul 2010

LUNDIN PETROLEUM HAS SPUDDED AVALDSNES EXPLORATION WELL, OFFSHORE NORWAY

Lundin Petroleum AB (Lundin Petroleum) is pleased to announce that drilling of exploration well 16/2-6 on the Avaldsnes prospect has commenced. The well is located in Block 16/2, production licence PL501, in the central North Sea sector of the Norwegian Continental Shelf (NCS). The Avaldsnes prospect is located approximately 25 km east of the Lundin Petroleum operated Luno discovery, on the opposite side of the Utsira structural high. The target is a Lower Cretaceous/Jurassic age sandstone sequence, analogous to the Luno reservoir, within a combined stratigraphic/four-way dip closure. The gross unrisked prospective resource of the primary Avaldsnes target is estimated by the operator at approximately 130 million barrels of oil equivalent (MMboe). Lundin Petroleum is using the semi submersible drilling rig Transocean Winner to drill the prospect. Drilling is expected to take approximately 38 days, excluding testing. Lundin Norway AS is the operator with 40 percent interest. Partners are Statoil Petroleum AS with 40 percent interest and Maersk Oil Norway AS with 20 percent interest.

31 May 2010

LUNDIN PETROLEUM EXPLORATION WELL TO TARGET THE APOLLO PROSPECT IN PL338

Lundin Petroleum AB ("Lundin Petroleum") will drill a new exploration well 16/1-14 in PL338. The well will target the Apollo structure, which is situated immediately to the south of the Draupne field in PL001B, and some 5 kms northwest of and down-dip from the Luno field located in PL338. The main objective of the Apollo well is to test what is believed to be a possible extension of the Draupne field into PL338. This discovery, which was recently successfully appraised by the Draupne field partners, is in Upper Jurassic sands at a depth of some 2,400m below sea level. Lundin Petroleum currently estimates unrisked gross prospective resources in the range of 20 to 130 MMboe for the Apollo prospect in PL338. The range of the resources quoted is dependent on the geological model used which is very sensitive to sand thickness variations towards the south into license PL338. The well will be drilled in the third quarter 2010 with the rig Transocean Winner. Lundin Petroleum is the operator of PL338 with a 50 percent interest. Partners are Wintershall Norge ASA with 30 percent and RWE DEA Norge AS with 20 percent interest. Ashley Heppenstall President & CEO commented: "The Apollo well will test an extension of a proven and tested hydrocarbon accumulation with upside potential based upon our geological model. The prospect is close to the Luno discovery and further exploration success in the area will clearly be beneficial in respect of the development of the Greater Luno Area"

4 Feb 2010

EXPLORATION WELL IN PL359 SPUDDED, OFFSHORE NORWAY

Lundin Petroleum AB (Lundin Petroleum) is pleased to announce that drilling of exploration well 16/4-5 on the Luno High prospect in the Greater Luno Area has commenced. The well in PL359 is located 9 km south of the Luno field on the southern Utsira High in the North Sea. Well 16/4-5 in PL359 will target sandstones of Jurassic and Triassic age in a combined stratigraphic-/structural trap. The Luno High prospect is estimated to contain gross unrisked prospective resources of 103 MMboe. The well will also test potential basement prospectivity similar to that encountered in well 16/1-12 (Luno South). The planned total depth is approximately 2,275 meters below mean sea level. The well will be drilled from the semi-submersible drilling rig Transocean Winner. Drilling is expected to take approximately 50 days. Lundin Petroleum is the operator and has a 40 percent working interest in the license. Partners are Statoil Petroleum AS with 30 percent and Premier Oil Norge AS with 30 percent.

28 May 2009

Gas discovery at Corvus

Gas has been discovered by StatoilHydro in the Corvus prospect in the Oseberg area of the North Sea. The Corvus exploration well was drilled about 7.5 kilometres north-west of Oseberg C, and proved small quantities of gas in the Upper Jurassic Draupne formation. “Reservoir thickness remains unclarified because the well, for technical reasons, could not be drilled deeper,” explains Tom Dreyer, head of infrastructure-led exploration in the North Sea. “This means that a possible appraisal well will be needed before the size of the discovery can be evaluated.” The well was drilled from Transocean Winner in 113 metres of water to a vertical depth of 3,991 metres and will now be permanently plugged and abandoned. After this work is completed, the rig is due to drill an appraisal well on the Peon gas discovery in production licence 318.

27 Mar 2009

Closer look at Peon

An appraisal well has been completed by StatoilHydro on the shallow Peon gas discovery in the North Sea, which was made in 2005. Part of the Naust formation, this shallow deposit contains estimated recoverable resources of 15-30 billion standard cubic metres. The main goal of the appraisal well was to test the productivity of the discovery and to qualify the well concept for a possible development. “We’re the first company to look at opportunities for commercial utilisation of shallow gas,” explains Finn Langgård, project manager for Peon. “In connection with this discovery, we’re developing new technology which will allow us to utilise gas resources of this kind. “We’ve taken an important step forward with the present well in qualifying the solutions which will make it possible to recover Peon gas.” The well was drilled from the Transocean Winner semi-submersible rig to a vertical depth of 640 metres in 372 metres of water. It will now be plugged and abandoned. The licensees in production licence 318 are StatoilHydro, the operator with 60%, Petoro with 20% and Idemitsu Petroleum Norge with 20%.

25 Aug 2008

Oil discovery near Sleipner

The presence of a considerable oil column has been confirmed under the Dagny structure in the North Sea. The purpose of well 15/5-7 in production licence 048 was to confirm the presence of oil in Mid-Jurassic reservoir rocks below the Dagny gas discovery. The well confirmed an oil column of some 100 metres in the Hugin formation. The total recoverable volume is estimated at 100-125 million barrels of oil equivalent. "This is a very exciting discovery. The Sleipner area is still very prospective, and this well confirms that there is also a good chance of making oil discoveries in this area," says Tim Dodson, senior vice president for StatoilHydro's explorations on the Norwegian continental shelf. "The discovery is a result of focused efforts to find more hydrocarbons that may be phased in to Sleipner. I will credit my exploration organisation for coming up with the idea that there might be an oil column below the gas at Dagny, which was discovered 30 years ago," he says. The Dagny discovery is located some 10 kilometres north-west of Sleipner West. Development of the discovery in association with the Sleipner field will be considered. Drilled in 119 metres of water by the Transocean Winner drilling rig the well was completed in the Upper Triassic Skagerrak formation, 4,037 metres below the sea level. A side-track is now being considered in order to establish the oil-water contact. The costs of the well are split between PL048 and PL029. StatoilHydro (the operator) has an interest of 78.2 percent in PL048, whereas the partner, Total, has an interest of 21.8 percent. ExxonMobil is the operator of PL029 (100 percent).

18 Jun 2008

The Trow Prospect (Well 32/2-1) Spudded in PL 369

Talisman Energy has commenced drilling operations in Production License 369 with the semi-submersible drilling rig Transocean Winner. The exploration well, located east of the Troll Field, is aiming for hydrocarbons in Jurassic sandstones (Trow prospect). Det norske estimates that Trow could hold 100 million barrels of oil equivalents, with a discovery probability of 20%. The drilling operation is expected to take about 28 days. Det norske holds a 20% interest in PL 369. Operator Talisman Energy holds 40%. Other licensees include Petro Canada Norge and Revus, with a 20% interest each.

13 May 2008

Two new discoveries in the Oseberg area

StatoilHydro has discovered hydrocarbons in two wells in the Oseberg area in the Norwegian offshore sector of the North Sea. The first discovery was made in a long-reach exploration well from the Oseberg C platform, targeting the Cook Formation in the Theta structure. “The well is designed to be converted to a producer within 45 days after the discovery, giving an extremely quick turnover from prospective resources to producible reserves,” says Oseberg Petech project leader Trond Eide. Prospect mapping and well planning was a collaborative effort between the Oseberg Petech team and the North Sea infrastructure-led exploration team, with the former unit being responsible for the drilling operation. “Work is currently underway to determine the optimal production solution,” says Bjørn Inge Braathen, leader of the exploration team working in the Oseberg area. Depending on the development solution, preliminary expected volumes are around 5 million barrels of oil. Shortly after the Theta discovery, oil and gas was also found in the Delta S2 structure in the Oseberg South area. The Delta S2 discovery targeted the Brent Group, and is believed to contain about 16 million barrels of recoverable oil equivalents. Well 30/9-21S was drilled by Transocean Winner, and the rig is now drilling a second branch to test the nearby Richards prospect. “We have been excited about the prospectivity of the Oseberg area for a long time, and after a few years of limited exploration in the area it’s good to see that the efforts are stepped up in a successful manner,” says Tom Dreyer, vice president for infrastructure-led exploration North Sea. The Delta S2 discovery may be tied to the nearby Delta template within a few years and continued exploration success in the area may trigger new development solutions.

20 Feb 2008

Oil find at Grane

An oil discovery has been made by StatoilHydro due south-west of the Grane field in the North Sea. The size of the find is estimated to be in the order of 20 – 30 million recoverable barrels of oil. “The find is a continuation of the good start to exploration activities on the Norwegian continental shelf in 2008,” says Tim Dodson, director of exploration in Exploration and production Norway. “This find is the fourth discover we have been involved in so far this year,” he says. StatoilHydro has previously reported a discovery in the Fram area of the North Sea and Gamma at Haltenbanken. Additionally, a discovery was made at Marulk on Haltenbanken where ENI Norway is the operator and StatoilHydro has a 50 per cent ownership stake. The discovery at Grane was made in connection with the production licence PL169 for which StatoilHydro is operator, and is named M prospect. Exploration well 25/11-25 S was drilled down to reservoir rock types of Paleogenic age, and drilling has been concluded. The well is the thirteenth exploration well in production licence 169. The licence was awarded in the thirteenth concessionary round in 1991. The discovery in the M prospect is interesting and may be relevant for further investigation when seen in the context of other discoveries in the area. The well was not formation strength-tested, but comprehensive data collection and testing has been carried out. The well was drilled to a vertical depth of 1804 metres below the sea surface. The sea depth is 125 metres. The well will now be permanently plugged and abandoned. Well 25/11-25 S was drilled by the semi-submersible drilling rig Transocean Winner, which will now drill exploration well 25/11-25 A as a lateral branch well, to prove the presence of petroleum in a nearby prospect in the same production licence. Licencees in production licence PL169: StatoilHydro (operator) (57 percent), Petoro (30) and ExxonMobil (13).

17 Sep 2007

Gas/condensate find in Njord area

As operator of exploration and production licenses 107 and 132, Hydro is close to concluding the drilling of exploration well 6407/7-7S in the Njord area in the North Sea. There are proven gas/condensate reserves in the well. “This find increases the chance for developing resources proven on Njord’s Northwest flank, as additional reserves to the Njord field,” says Rune Adolfsen, field manager for Hydro’s Njord field unit. The well is located about five kilometers northwest of the Njord A platform on the so-called Njord Northwest Flank. The point of the well was to prove petroleum in Jurassic reservoir rock. The size of the find is estimated at between one to six billion standard cubic meters recoverable gas and between 0.5 to 2.5 million Sm3 recoverable condensate. The well was not production tested, but significant data collection and core samples have been done. The well is the seventh exploration well in license 107. The license was awarded in 1985 in the 9th concession round. The latest well was drilled to a vertical depth of 3,646 meters beneath the surface of the sea and concluded in Lower Jurassic. The sea depth was 334 meters. The well will now be permanently plugged and abandoned. Well 6407/7-7S was drilled by the rig Transocean Winner, which will now continue drilling branch well 6407/7-B-1 Y1H on the Northwest Flank.

11 Jun 2007

Oil find in North Sea

As operator of exploration and production license 090, Hydro has made a small oil find on the H-North Prospect in the North Sea. “The find on H-North can provide valuable additional resources to fields in the Fram area. The find confirms Hydro exploration successes in this area over the past few years,” says Tore Lilloe-Olsen, exploration manager in the Development Norway sector of Hydro’s Oil & Energy business area. Both the Peon and Astero finds were discovered in this area in 2005 and proven to contain recoverable oil. Development concepts for the finds are presently being worked on. Exploration well 35/11-15S with sidetrack 35/11-15ST5 were drilled to a respective total depth of 3,177 and 2,961 meters below the surface of the sea, and ended in rock dating from the Upper Jurassic period. Oil was found in both the main well and the sidetrack. The main well also contains gas. The wells were not production tested, but there has been significant data collection and samples taken. The wells are now permanently plugged and abandoned. A total of 14 exploration wells have been drilled in license 090. The wells were drilled by the semi-submersible drilling rig Transocean Winner at a water depth of 363 meters. Transocean Winner will now proceed to drill an exploration well on exploration and production license PL 107 on the Njord field, also operated by Hydro, on the Haltenbanken in the Norwegian Sea.

23 Aug 2006

Appraising the Astero discovery using a new well

Hydro's promising oil discovery on the Astero prospect north of the Fram field in the North Sea is to be appraised using a new well. Drilling started on Wednesday morning, using the semi-submersible drilling rig "Transocean Winner". The drilling rig sailed from Ølen on last Thursday, and performed anchoring tests prior to reaching the Astero prospect on Sunday evening. Drilling of the well "35/11-14S" began on Wednesday morning, and is scheduled to continue for 61 days. The aim is to appraise the size of the Astero discovery, which Hydro made in May 2005, and to determine the gas-oil contact. The well will also provide information regarding reservoir quality in the field. The results from the first exploration well on Astero are said to be promising, and estimates indicate that the discovery is commercially interesting. However, as yet no development concept for the field has been decided upon.

14 Dec 2005

Secures rig for exploration offshore Norway

Hydro has entered into an agreement with Transocean Offshore (North Sea) Ltd NUF to lease the drilling rig "Transocean Winner" for a three-year period. The rig will be reactivated to drill exploration wells in the Norwegian offshore sector by the fourth quarter of 2006. Hydro is an active exploration company and made six finds in Norwegian waters during 2005. Hydro presently operates five floating rigs and has both alone and together with other oil companies in Norway, secured good rig capacity to carry out planned as well as new exploration drilling operations in the Norwegian offshore sector during the coming years. ”We see significant potential for future exploration activity in the Norwegian offshore sector and want to contribute our expertise, capacity and experience to map out and develop resource potential both in mature and new areas,” says Hydro Exploration Norway chief Lars Christian Alsvik. ”With this in mind, we have applied for new shares and operatorships in the 19th concession round and TFO round (award of pre-defined areas) in 2005. This rig contract is therefore a very important part of Hydro’s strategy. It secures us additional capacity to operate a focused and long-term exploration program in Norway,” he points out.

21 Aug 2001

Drilling in record time on Åsgard

By using a rotary steerable drilling tool with mud motor, Transocean Winner recently drilled a well in record time on the Åsgard field in the Norwegian Sea. This is the first time on the Norwegian continental shelf, and only the second time in the world, that the PowerDrive drilling tool from Schlumberger has been used in conjunction with a mud motor. The Transocean Winner rig took just three and a half days to drill a 12¼ inch section to the top of the reservoir on the Åsgard field. Normally it would take seven and a half days to drill the 2,150-metre section. The day rate for drilling operations on the rig is around NOK 2 million. A motor was included to achieve a higher rate of penetration (ROP). When directional changes are made with the motor during conventional drilling, ROP is a quarter of that achieved with the new system. The production well was drilled on Smørbukk, which is a hard, deep, high temperature structure. "Not only do drilling operations take less time with the new system, it can also be used for more technically challenging wells," reports Rune Skotvold, lead drilling engineer in Åsgard resource development. He believes that rotary steerable drilling combined with mud motor may be the future on Åsgard, but adds that needs vary a great deal from one field to another. The system is best suited to the most demanding fields, says Mr Skotvold.

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