Centrica Energy discovered gas at the Pegasus West discovery in the southern North Sea.
Image of the Paragon 391 jackup at Pegasus.
The Pegasus area is 150km east of Teesside, near the producing Cavendish, Trent and Esmond fields.
The exploration well was drilled and tested with the Paragon 391 jackup rig in 95ft water depth, approximately 7km west-southwest of the 43/13b-6Z Pegasus North discovery well.
According to partner Atlantic Petroleum, drill stem tests (DST) for 43/13b-7 Pegasus West flowed at a combined rate of more than 90MMcf/d from three Carboniferous intervals: DST 1 flowed at a maximum stable rate of 41MMcf/d on a 44/64 in. diameter choke; DST 2 flowed at a maximum stable rate of 42MMcf/d on a 44/64 in. diameter choke; and DST 3 flowed at a maximum stable rate of 8MMcf/d on a 30/64 in. diameter choke.
Centrica has suspended the Pegasus West well to assess data and to make a decision on development.
“As we continue to find and secure gas supplies for the UK, new discoveries like Pegasus prove there are many years left in the North Sea oil and gas industry and we are determined to play our part in maximizing the region’s potential,” says Colette Cohen, senior vice-president for the UK and the Netherlands.
Map of Pegasus. From Centrica.
In September, Atlantic announced the presence of gas at the 43/13b-7 Pegasus West well and at that time decided to drill stem test the well. The Pegasus discovery is a fault-bounded anticline with an Intra-Namurian sandstone reservoir. The well was drilled in December 2010 and an appraisal well on the Pegasus West structure was spudded in July 2014.
Centrica Energy operates Pegasus with a 55% interest with partners Third Energy (35%) and Atlantic (10%).
Pegasus West is also close to the large GDF Suez-operated Cygnus gas development, in which Centrica has a 48.75% stake. Cygnus has gross 2P reserves of approximately 18 billion cubic meters and is the largest offshore gas field to be discovered in the southern North Sea in 25 years. The first of four Cygnus project offshore gas platforms was installed 150km off the UK coast on 18 May. First gas for Cygnus is targeted for late 2015, and by 2016 the field will be the second largest individual gas producer in the UK.