Tower, which has a 30% interest, said the start date its later than expected owing to prolonged acceptance-testing by operator Repsol in advance of it taking the drillship on a three-year contract.
Welwitschia-1 is targeting net risked recoverable resources of 496 mmboe to Tower's 30% interest and will intersect up to five separate reservoir targets ranging from the Palaeocene-Maastrichtian to the Albian Carbonate sequence at a potential total depth of 3,000m.
The well is expected to take up to 46 days to drill, but Tower advises there will be no updates during this period and a comprehensive update will be published once the results have been analysed.
Graeme Thomson, Tower's chief executive, said: "We are very excited that the high potential Welwitschia well is to commence drilling in the coming days.
“This follows hard-on-the-heels of our announcement of a $32m placing, acquisition of exploration interests offshore South Africa, onshore Zambia and of an interest in Block 2B onshore Kenya where we expect to be drilling in late 2014.”