A separate flow of the Lower Hedinia measured 20.85MMcfd with testing beginning on September 24.
Rift's forward program is to isolate and flow the Toro and Lower Hedinia separator equipment before a clean-up and a separator flow test of the Upper Hedinia structure.
Once flow rates have stabilised, Rift has separator equipment onsite to measure the liquids yield of the gas.
"We are very pleased with these initial flow rates, which are in line with what we expected from the well-developed Toro reservoir," Rift chairman Ian Gowrie-Smith said.
"The Lower Hedinia rate from thinner sands is also highly encouraging. We look forward to reporting on the completed testing program during October, at which point we will be able to give a fuller analysis."
Rift is also working on a 210km 2D seismic program in Western Province.
The Alternative Investment Market-listed company recently signed a heads of agreement with Flex LNG to jointly develop and market Rift's onshore PNG gas reserves using a floating liquefaction unit.
The company also has a non-binding memorandum of understanding with Alcan to investigate the supply of around 40 billion cubic feet per annum of natural gas to Alcan's Gove Alumina plant, in Australia's Northern Territory, for 20 years after initial production is achieved.