By OGJ editors
HOUSTON, Feb. 25 -- Arc Energy Ltd., Perth, reported a flow of 3.7 MMcfd of gas from Permian Irwin River coal measures at the Corybas-1 exploration well on Production License L2 in the northern Perth basin in Western Australia.
The rate came on a drillstem test at 2,410-2,537 m through a ½-in. choke with 610 psia surface pressure. An earlier drillstem test at 2,425-59 m yielded 100 Mcfd.
Arc Energy was deepening the well to the projected TD of 2,670 m MD to evaluate other potentially gas-bearing zones in the Irwin River and the primary objective, the underlying Permian Upper High Cliff sandstone. A core in the High Cliff at 2,591-2,612 m had good gas shows, the company said.
Only two wells, neither tested, have penetrated the High Cliff on the Yardarino Terrace. The High Cliff drillstem tested 16.5 MMcfd of gas through a ¾-in. choke with 1,220 psi flowing wellhead pressure from 2,370-2,419 m in the Hovea-2 well 11 km to the south in 2002.
The Irwin River is known to be gas-bearing in the area and has previously been of generally poor reservoir quality. Irwin River coal measures produce gas in nearby Dongara field and are interpreted from existing well intersections on the Yardarino terrace to have as much as 400 bcf of gas in place in relatively poor reservoir in an inadequately tested accumulation known as the Elegans resource, Arc Energy said.
Western Australia Petroleum Co. Ltd. drilled Yardarino-1, the Perth basin's first commercial discovery, in 1964. Arc Energy and Origin Energy Developments Pty. Ltd. each hold 50% interest in L1 and L2.
