Rig: Transocean Rather

Name Transocean Rather
Owner Transocean Services Offshore LLC
Manager Transocean Offshore Deepwater Drilling Inc.
Rig Type Semisub
Sub Type Deepwater Floater
Jackup Type --
Max Water Depth (ft) 4500
Max Drill Depth (ft) 25000
Dimensions (ft) 325 x 287 x 144
Leg Length (ft) --
Competitive No

Current Location

Country --
Region --

Drilling Equipment

Drawworks Type Continental Emsco C3 Type II
Drawworks HP 3000
Mud Pumps Type Continental Emsco FB-1600 Triplex
Top Drive National Oilwell Varco TDS-4S
Hookload Capacity (lbs) 1500000

Rig Construction Details

Rig Design Gotaverken
Rig Model GVA 4500 Enhanced
Year Built 1987
Country of Build South Korea
Yard Name Okpo Shipyard
Group Yard Name Daewoo Shipbuilding & Marine Engineering (DSME)

Rig Contract Details

Operating Status Retired
Operator

News

18 Jul 2007

Rosebank a success

The Rosebank appraisal well 205/1-1 in block PL 1026, west of Shetland, is a success. During a production test, the well flowed at choked rates of 6,000 barrels of oil per day. Statoil has a 30% interest in the find. "Statoil is very encouraged by the first test results from Rosebank," says Gregory T Himes, vice president in Statoil global exploration (GEX). "The partnership is making every effort to commercialise the discovery as quickly as possible." The Rosebank discovery lies in some 1,000 metres of water, around 160 kilometres north-west of the Shetland Islands. "If commercial, Rosebank will add substantially to Statoil's Atlantic Margin production," Mr Himes says. The 205/1-1 well is the second appraisal well drilled in Rosebank as part of a three-well programme conducted by the Transocean Rather drilling rig. The deviated well is located at the southern end of the Rosebank structure and was drilled to a vertical depth of 2,750 metres. The oil is very light, with a gravity of 38 degrees API (American Petroleum Institute gravity scale). North Sea oil is normally of 20-30 API quality. The rig is currently preparing to move to the third appraisal well location in the northern part of the structure to drill well 213/27-A2. "The three-well programme is designed to fully evaluate the Rosebank discovery and fast-track a development," says Mr Himes. The well programme will optimise the understanding of the size, geometry and production potential of the field. It is expected that the programme will be completed by November 2007 when analysis of the appraisal data will determine the future work programme for the discovery. Statoil’s partners in the area are operator Chevron with a 40% interest, OMV (20%) and Dong Energy (10%). The group has acquired much of the acreage surrounding Rosebank where further prospects lie. In addition, Rosebank is 15 kilometres from the UK/Faroe Islands median line, which is promising for exploration in the Faroes where Statoil is operator in four large licences. In the area to the west of Shetland, Statoil already has a 5.88% interest in the BP-operated Schiehallion field.

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