The well was drilled directionally as planned to 11,960 ft (3,645m) to test the Jurassic Brent sandstones in the Central Causeway fault compartment approximately one kilometer southwest of the 211/22a-6 discovery announced last month, which tested a combined flow rate of 6,300 barrels of light oil per day from an 80 ft interval perforated in the Ness and Etive formations.
The 22a-7A well intersected a gross oil column of 203 ft in the Tarbert and Ness formations. A net pay thickness of 50 ft in very permeable sandstones with average porosity of 19 per cent is estimated from the electric log data and a series of MDT tests. These 22a-7A potential reservoirs are more permeable but otherwise are very similar to the reservoirs encountered in 22a-6, which intersected a gross oil column of 233 ft and a net pay interval of 105 ft with average porosity of 19%.
The oil column intersected in the Tarbert formation in 22a-7A was not encountered in the previous 22a-6 well. Although not definitive, the underlying Etive Formation appears to be water bearing in 22a-7A.
Antrim and its joint venture partners have elected not to production test the 22a-7A well, which would be confidently expected to test similar rates as achieved from the previous 22a-6 tests, and instead case the 22a-7A well for future production and immediately start drilling the third well in the program.
The third well in Antrim's three-well Causeway program will target the Ness sandstone on the southwestern flank of the Causeway structure. The well is designed to appraise the 211/22a-3 discovery made in 1984, which tested up to 5,500 barrels of oil per day from the Ness sandstone. The 22a-8 well is expected to start drilling later this week and will take approximately 35 days to drill.
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