Karoon Gas Australia Ltd.’s test of the Echidna-1 wildcat in the Santos basin offshore Brazil resulted in a stabilized flow rate of 4,650 bo/d from Paleocene reservoirs with a flowing head pressure of 504 psi on a 1-in. choke.
The flow, over a 2-hr period, was constrained by the test facilities. An earlier DST in the Paleocene over the intervals 1,767-1,806 m and 1,813-1,843 m over a 24-hr period averaged a stabilized flow of 3,200 bo/d through a 44/64-in. choke with a wellhead flowing pressure of 733 psi and a gas-oil ration of 701 cf/bbl.
Physical oil samples measured 38.6° API with a gas-oil raio of 701 cf/bbl. There was no measurable carbon dioxide or sulphur dioxide present and no sand production.
Echidna-1 was drilled on Block S-M-1102 and intersected a 213-m gross thickness oil column with 104 m of net pay across Paleocene and Maastrichtian reservoirs.
Karoon says the Maastrichtian section will be evaluated with cores and production tested in in “more optimally located appraisal wells on the field.”
The company added that the Paleocene reservoir quality at Echidna is better than observed anywhere else in Karoon’s Brazilian acreage.
Karoon as operator with 65% interest and Pacific Rubiales Energy Corp. with the remaining interest have decided not to take up a second well option.
Instead the joint venture will continue geoscience and engineering work to characterize both Echidna and the earlier Kangaroo discoveries. Further appraisal drilling is planned in the near term. Pre-FEED studies will be conducted in parallel with the appraisal drilling program.
Both Kangaroo and Echidna confirm the validity of the salt flank play in the region and other prospects with a similar play type are present in the acreage.