EXPLORATION

Lakes sees life in old Trifon wells

Lakes Oil is preparing to run a fracturing program in several sections of both the Wombat 1 and Wombat 2 wells in order to lift flow rates following the failure of its cased hole Drill Stem Test in the 1355-1395 metre zone of the Wombat-2 well.

Lakes sees life in old Trifon wells

Previous drill stem tests over the interval 1464m-1497m achieved a maximum flow rate of 470,000 cubic feet per day, declining to just over 400,000 cubic feet per day, at the end of the one-hour flow period.

Afterwards the well was shut in for three hours for formation pressure build-up. The results from second drill stem test, over 1400m–1428m, flowed at a rate of 217,000 cubic feet per day.

The Hunt drilling rig used for both the Wombat wells will now be moved to the Trifon 2 well site located approximately 50 metres from the site of the original Trifon 1 well drilled in December 2000.

The Trifon Tight Gas Project has been designed to produce gas from the Strzelecki Formation after an engineering study reviewing the old wells suggested that future wells should be drilled underbalanced using either a coiled tubing unit or conventional drilling with oil based muds.

With these underbalanced techniques, the company hopes to substantially lift gas recoveries.

Trifon 2 will be drilled in two stages after which the Hunt drilling rig will be moved to North Seaspray 3, originally drilled in May 2000, where it will re-enter the original well and drill an additional 250 metres, and then using a coiled tubing unit drill horizontally for approximately 300 metres underbalanced through the Strzelecki Formation.

The Trifon Tight Gas Project is funded by Lakes Joint Venture Partner Jarden Corporation Australia to the extent that the first $5 million of expenditure contributed by them will earn a 50% interest in a defined area which covers both the Trifon and Gangell structures.

Former permit holder Roma Petroleum NL is entitled to an overriding royalty of 5% of the wellhead value of any hydrocarbon production from Wombat.

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