Sydney-listed Vintage Energy on March 26 reported a “highly successful” gas flow from Nangwarry-1 well onshore Otway basin in South Australia.  

“The strong gas flows delivered to date are estimated at 12-14mn ft³/day through two 48/64” chokes (equivalent to a 68/64” choke) at 900 psi wellhead pressure, which has already easily exceeded our expectations,” the company said. “The perforations were done over a 5 m interval approximately 110 m below the next planned perforation interval which will test the top of the interpreted gas column.” 

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Vintage will now move to the uppermost part of the Top Pretty Hill Formation and, once perforated, will start an extended production test to further quantify the flow rate from the interpreted gas column and analyse the pressure data for indications of connected volumes. 

“We are extremely pleased that the first perforation zone in the Top Pretty Hill Formation has delivered an excellent result, with a very strong flow of CO₂ gas observed,” Vintage managing director Neil Gibbins said. “The most pleasing part of this result is that gas flow came from the lower section of the interpreted gas column, with log data indicating this section would likely flow at a lower rate than the upper section.” 

Gross recoverable estimates for Nangwarry-1 CO₂ are: low of 7.8bn ft³ (3.9bn ft³ net), best of 25.1bn ft³ (12.6bn ft³ net), high of 82.1bn ft³ (41.1bn ft³ net).