Total SA expects to add oil and gas reserves exceeding 65 million boe to its Laggan-Tormore gas and condensate development in deep water west of the UK Shetland Islands by developing and tying back nearby Edradour gas field.
With the decision to proceed with Edradour development and to farm in to Glenlivet, Total “is establishing a new strategic hub in the West of Shetland area,” said Patrice de Vivies, senior vice-president, exploration and production, Northern Europe.
Total approved the integrated development of Laggan and Tormore fields in 2010 after the UK government approved tax incentives for West of Shetland gas fields (OGJ Online, Feb. 16, 2010).
Production from Laggan, which is 125 km offshore and Tormore, 16 km southwest of Laggan, is to start this year with capacity of 90,000 boe/d of gas and condensate. Total estimates gas reserves at more than 1 tcf and expects gas output to peak at about 500 MMscfd.
The company is developing the fields with two, six-slot production template-manifolds in 600 m of water. Two 18-in., 143-km production flowlines will carry the commingled, multiphase fluid stream to a new gas processing plant, the Shetland Gas Plant, at the Sullom Voe Terminal.
Processed gas will flow from Sullom Voe through a new pipeline, with capacity of 665 MMscfd, to a tie-in 230 km south with the Frigg UK pipeline.
The fields are powered and controlled from the Shetland Gas Plant via a main 126-km umbilical to Laggan and a 17-km infield umbilical between Laggan and Tormore.
The Seadrill West Phoenix semisubmersible rig is drilling production wells, of which nine are planned in two phases. Productive formations in the fields lie about 3,000 m below the seabed.
Total operates the Laggan-Tormore project with an 80% interest. DONG holds 20%.
Edradour, Glenlivet plans
At Edradour, Total, DONG, and others plan to convert the discovery well into a producer tied back to the main Laggan-Tormore flowline with a 16-km production line. Total expects flow to start from the well, which is in about 300 m of water, late in 2017.
Plateau production will be 17,000 boe/d of gas.
Edradour, discovered late in 2010, is about 20 km east of Laggan field and north of the main flowline (OGJ Online, Jan. 6, 2011). Total, operator, holds a 75% interest. DONG holds 25%.
Glenlivet, a 2009 discovery, is north of Edradour in 435 m of water (OGJ Online, Sept. 15, 2009). DONG retains 20% of Glenlivet. Faero Petroleum (UK) Ltd. and First Oil Expro Ltd. hold 10% interests each.
The Glenlivet partners are studying development of the field with two wells and a 17-km production pipeline tied to Edradour.