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Sunday, May 21, 2017
Cairn Energy, FAR Ltd., Woodside Energy, and Petrosen saw more success offshore Senegal with another successful appraisal well. The SNE-6 was drilled safely, completed ahead of schedule, and under budget.
The objective of the SNE-6 well, together with the previous successful SNE-5 well, was to flow oil from one of the principal units in the upper (400 series) reservoirs and demonstrate connectivity between the two wells. Pressure data from SNE-6 immediately confirmed good connectivity with SNE-5 and accordingly a short DST was performed.
Multiple samples of oil were recovered during the DST, which according to Cairn indicated a similar quality to previous wells. Two DSTs were conducted within the Upper Reservoir units; DST#1A fowed from an 11 meter interval at a maximum rate of around 4,600 bpd on a 60/64” choke and around 3,700 bpd on a 52/64” choke during a 48 hour main flow period.
For the DST#1B an additional 12 meter zone was added and the well flowed at a maximum rate of ~5,400 bpd on a 76/64” choke, followed by a 24 hour flow at an average rate of about 4,700 bpd on a 64/64” choke.
Pressure data from SNE-6 has confirmed that the upper reservoir is connected with SNE-5. Work is ongoing to integrate this new data and to estimate the extent to which water flood secondary recovery can be applied to these upper reservoirs. Further analysis will be performed once interference test data has been collected from the observation wells, to determine the impact on modelled reservoir architecture, recoverable resource base and forward development plan. We expect to provide further information at our half year results in August.
SNE-6 is being plugged and abandoned and the Stena DrillMAX drill ship is moving location to commence operations at the FAN SOUTH exploration well, about 20 km south west of the SNE-3 well in ~2,175 meter water depth. FAN SOUTH is targeting a mean prospective resource of more than 110 million barrels with dual prospects; an Upper Cretaceous stacked multi-layer channelized turbidite fan prospect and a Lower Cretaceous base of slope turbidite fan prospect, which is equivalent to the FAN-1 2014 oil discovery.
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