Serinus said in a statement its well Winstar-12bis has reached its total depth of 3,855 meters, with the presence of hydrocarbons was initially confirmed by fluorescence exhibited in the recovered core and drilling cuttings, and subsequently with open hole wireline logs.
Early analysis of the data acquired from electric logs, full diameter core and drilling records indicate that the well has encountered 79 meters of oil bearing reservoir in the Upper Hamra, Lower Hamra and El Atchane formations, above an oil to water transition zone present throughout the lower zones in the well.
Average reservoir porosity is 10 per cent. An additional 14 meters of oil bearing reservoir have been identified within the transition zone, and the nuclear magnetic resonance tool has also unexpectedly indicated moveable oil below the base of the transition zone.
Further testing will be required to understand the nature of the hydrocarbons in these lower sections. The well is being completed, after which the rig will move immediately to Winstar-13 (WIN-13).
Once the rig is off location, WIN-12bis will be put on an extended production test.
“Winstar-12bis is the first well drilled by Serinus in Tunisia since the Winstar acquisition, and initial drilling and log results look promising,” said Jock Graham, executive vice president and chief operating officer of Serinus.
“However, we still need to establish how the well will perform once on production and to this end, we are completing the well in order to undertake a production testing program.”
“We also experienced some delays while drilling this well due primarily to equipment failures associated with the rig, however those issues have been rectified and we anticipate better drilling productivity on Winstar-13, which will spud immediately after WIN-12bis is completed and the rig move finished,” Graham added.
