Well 48/24-8 was drilled to a depth of 4,150 ft by the semi-submersible rig Sedco 711. The well tested gas at a maximum rate of 27.9 mmscfd. For comparison with previous tests, Ramco has normalized this data to a constant well head pressure of 565 psia and on this basis the well can deliver 25.2 mmscfd. This well was drilled into an area of the field where the reservoir is at a shallower depth than the rest of the field. The well has confirmed that a common gas water contact exists throughout the field. As a result there is a greater column of gas bearing sands at that location than had been assumed in the reserves estimates announced to date.
Well 48/24-9 was drilled to a depth of 3,655 ft by the semi-submersible rig Sedco 704. The well tested gas at a maximum rate of 19.3 mmscfd. For comparison with previous tests, Ramco has normalized this data to a constant well head pressure of 565 psia and on this basis the well can deliver 12.5 mmscfd. Drilling and completion performance on this well has been the best to date with an elapsed time of just 24 days.
The flow rates of the earlier wells at the same constant well head pressure of 565 psia were, well 48/24-5A, 13.9 mmscfd; well 48/24-6, 34.3 mmscfd; and well 48/24-7A, 16.7 mmscfd. All of these rates are above the 10 mmscfd assumed in the base production forecast for the field.
The Sedco 711 is now being relocated within the field and will shortly commence the drilling of well 48/23-2, while the Sedco 704 has already moved and commenced the re-completion of the 2001 appraisal well 48/24-5A; these are the final wells in the drilling program.
All 25.5 km of 8" infield pipelines and associated umbilicals which will connect the wells to a central field manifold have been laid on the sea bed and trenched, as has the 35 km of 18" main pipeline back to Marathon's Kinsale A platform. The central manifold is also in place on the sea bed and the sub-sea hook up work has commenced.
The construction work necessary to connect the Seven Heads gas pipeline to the Marathon Kinsale A platform is well under-way. The strong gas price projections for the winter months have encouraged the Seven Heads partners to extend the project budget and to commit to an accommodation rig to enable the remaining topsides work schedule to be accelerated, overall allowable personnel numbers on Marathon's Kinsale A platform being a limiting factor. This action should enable the project to deliver first gas early in the fourth quarter of this year.
Proved and probable reserves were independently assessed at 300 bcf before this year's drilling program began. This figure will be reviewed once the drilling program has been completed. Ramco has agreed to sell its share of the field's gas production to Innogy Ireland Limited.
The Seven Heads partners are Ramco (Operator) 86.5%, Island Petroleum Developments Limited 12.5% and Sunningdale Oils (Ireland) Limited 1.0%.
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