Santos has stated that the target Middle Dua sand sequence was encountered as expected. Following successful coring of the reservoir and wireline logging operations, two reservoir zones were drill stem tested.

The first zone tested flowed oil at a sustained rate of 1,650 barrels of oil per day (bopd) plus 1.4 million standard cubic feet of gas per day (MMscfd) on a 40-64 inch choke. The second zone tested flowed oil at a sustained rate of 2,680bopd plus 2.1MMscfd on a 48-64 inch choke.

The well will be suspended as a future producer and the rig will move to carry out the exploration program in Block 12W with the drilling of the Chim Ung and Chim Cong exploration prospects.

David Knox, Santos’s acting CEO, said: The positive results from the Chim Sao North appraisal well are encouraging and we are working closely with our partners towards a final investment decision on the Chim Sao development. Santos entered Vietnam in 2006 and has made very good progress since with oil discoveries at Chim Sao and Dua.