Unlike its predecessors, the Callawonga-4 well will not be production tested, as Cooper said the performance of the Namur reservoir was well established in the previous three wells.

Callawonga-4 is now being cased and a workover will complete it as an oil producer in the near future.

The field is producing from Callawonga-1 and -2, with Callawonga-3 to be brought onstream in the next few weeks.

The Callawonga-4 well concludes a successful appraisal-development drilling and the data will be assimilated to update the recoverable oil reserves figure for the field.

Once Callawonga-4 is completed, the rig will move to the south of the Christies Oil Field to drill the Sheringa-1 exploration well.