LONDON -- The Tweneboa-1 well, offshore Ghana, has been deepened to 3,938 m (12,920 ft) and encountered 4 m (13 ft) of highly pressured oil-bearing sands as well as an over-pressured zone at total depth, according to Tullow Oil.
Results of wireline logs, pressure measurements, and sampling show that the well has encountered oil of 26° API, which is independent of the shallower light hydrocarbon accumulation. Near the total depth of the well, an over-pressured zone was encountered which limited further progress, the company says.
Integration of the seismic and well data is ongoing and further exploration drilling will be required to test the extent of these deeper levels as well as the shallower accumulation where seismic indicates sands thicken away from the well location, Tullow reports.
The deepwater rigEirik Raude drilled the well in a water depth of 1,148 m (3,766 ft) west of the Jubilee field.