LONDON -- Tullow Oil’s Enyenra-2A appraisal well in the Deepwater Tano license offshore Ghana has encountered oil in high-quality sandstone reservoirs.
The well by the drillship Deepwater Millennium reached a TD of 4,234 m (13,891 ft) in a water depth of 1,674 m (5,492 ft). The location is down-dip of Owo-1 (since re-named Eyenra), 7 km (4.35 mi) to the north, the aim being to appraise the field’s upper and lower channels.
Wireline logs, reservoir fluid samples, and pressure data indicate that Enyenra-2A intersected 21 m (69 ft) of net oil pay in the upper channel and 11 m (36 ft) of net oil pay in the lower channel.
Pressure data show that the oil is in communication with the Owo-1 well, and oil pressures in the lower channel suggest it may also be in communication with the deeper pools evidenced in Owo-1 and its sidetrack.
Additionally, Enyenra-2 tested a deeper Turonian fan, intersecting 5 m (16.4 ft) of gas/condensate bearing sandstones. The extent and thickness of this zone away from the well is undergoing interpretation.
Once operations have been completed, the well will be suspended for later use. Prior to flow testing, pressure gauges will be deployed to measure reservoir connectivity.
Deepwater Millennium will stay in the block to complete drilling of the Tweneboa-4 well. The next appraisal well will be Enyenra-3A, up-dip to the north of Owo-1.
Angus McCoss, Tullow’s exploration director, said: “This represents a major step forward in the appraisal of the Enyenra-Tweneboa area and is highly encouraging for our target to declare commerciality later this year. We are now looking forward to leveraging our expertise in the Jubilee play across the Atlantic through drilling the high-risk, high-impact, Zaedyus prospect in French Guiana in March.”